New IAC Wiki - User contributions [en]

PositronTargetWorkByChrissJackson

2012-05-11T17:29:29Z

Jackchr2: /* Feedthroughs */

;Chriss Jackson's Positron Target development logbook

;Goal
: Construct a Tungsten target and vacuum enclosure to be used for generating positrons using an incident electron beam.

=Geometry=

==Tungsten Disks==

;Dimensions are in cm

[[File:HRRL_PosTargetDesign_4-20-11.png| 200 px]]

http://www.alibaba.com/product-gs/346924116/Tungsten_Disk_With_Screw.html

http://www.zlxtech.com.cn/products.asp?productcode=7401000404

http://www.cleveland-tungsten.com/

If the motor has a radius of 2.5" and I want to shield the motor from the beam using 2" of Pb and the beam is about 1" in diameter then I want a Tungsten disk that is

5.21" in radius = 13.25 cm in radius ~ 30 cm in diameter

==Target Chamber design==

Latest Design From empire and Sadiq's measurement of the available space

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:EmpMagHRRLPositronTargetChamberDrw_9-20-11.png | 100 px]]||[[File:HRRLPositronTargetSpace_10-5-11.png | 100 px]] || [[File:HRRLPositronTargetCoupler_10-5-11.png | 100 px]]|| [[File:HRRLPositronTargetHub_10-5-11.png | 100 px]]
|-
| Target motor Design || Available beam line space || Motor axle coupling to rotary union || Hub and spline to attache targets
|}

Dimensions for the target chamber box. Measurements in inches. updated 11 May 2012. Holes for tubing still missing, need to measure.

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:Target_box-bottom.jpg | 100 px]]||[[File:Target_box-front.jpg | 100 px]] || [[File:Target_box-left.jpg | 100 px]]|| [[File:Target_box-iso.jpg | 100 px]]
|-
| Bottom view || Front View || Left View || Isometric View
|}

The resolution in the above image makes it too dificult to read the numbers. See if you can upload a PDF version.

=Equipment=

==Motor==

== Controller==

==Vacuum Chamber==

==Feedthroughs==

[[File:liquid_nitro_tubing.gif]]

A: 5.88
B: 3.00
C: 4.25
D: 4.63

http://www.mdcvacuum.com/DisplayPart.aspx?d=MDC&p=611005

=Performance tests=

==Heat load calculation==

[[HRRL_Positron_Rotating_W_Target]]

PositronTargetWorkByChrissJackson

2012-05-11T17:28:32Z

Jackchr2: /* Feedthroughs */

;Chriss Jackson's Positron Target development logbook

;Goal
: Construct a Tungsten target and vacuum enclosure to be used for generating positrons using an incident electron beam.

=Geometry=

==Tungsten Disks==

;Dimensions are in cm

[[File:HRRL_PosTargetDesign_4-20-11.png| 200 px]]

http://www.alibaba.com/product-gs/346924116/Tungsten_Disk_With_Screw.html

http://www.zlxtech.com.cn/products.asp?productcode=7401000404

http://www.cleveland-tungsten.com/

If the motor has a radius of 2.5" and I want to shield the motor from the beam using 2" of Pb and the beam is about 1" in diameter then I want a Tungsten disk that is

5.21" in radius = 13.25 cm in radius ~ 30 cm in diameter

==Target Chamber design==

Latest Design From empire and Sadiq's measurement of the available space

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:EmpMagHRRLPositronTargetChamberDrw_9-20-11.png | 100 px]]||[[File:HRRLPositronTargetSpace_10-5-11.png | 100 px]] || [[File:HRRLPositronTargetCoupler_10-5-11.png | 100 px]]|| [[File:HRRLPositronTargetHub_10-5-11.png | 100 px]]
|-
| Target motor Design || Available beam line space || Motor axle coupling to rotary union || Hub and spline to attache targets
|}

Dimensions for the target chamber box. Measurements in inches. updated 11 May 2012. Holes for tubing still missing, need to measure.

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:Target_box-bottom.jpg | 100 px]]||[[File:Target_box-front.jpg | 100 px]] || [[File:Target_box-left.jpg | 100 px]]|| [[File:Target_box-iso.jpg | 100 px]]
|-
| Bottom view || Front View || Left View || Isometric View
|}

The resolution in the above image makes it too dificult to read the numbers. See if you can upload a PDF version.

=Equipment=

==Motor==

== Controller==

==Vacuum Chamber==

==Feedthroughs==

[[File:liquid_nitro_tubing.gif]]

A: 5.88
B: 3.00
C: 4.25
D: 4.63

[http://www.mdcvacuum.com/DisplayPart.aspx?d=MDC&p=611005]

=Performance tests=

==Heat load calculation==

[[HRRL_Positron_Rotating_W_Target]]

PositronTargetWorkByChrissJackson

2012-05-11T17:28:02Z

Jackchr2: /* Feedthroughs */

;Chriss Jackson's Positron Target development logbook

;Goal
: Construct a Tungsten target and vacuum enclosure to be used for generating positrons using an incident electron beam.

=Geometry=

==Tungsten Disks==

;Dimensions are in cm

[[File:HRRL_PosTargetDesign_4-20-11.png| 200 px]]

http://www.alibaba.com/product-gs/346924116/Tungsten_Disk_With_Screw.html

http://www.zlxtech.com.cn/products.asp?productcode=7401000404

http://www.cleveland-tungsten.com/

If the motor has a radius of 2.5" and I want to shield the motor from the beam using 2" of Pb and the beam is about 1" in diameter then I want a Tungsten disk that is

5.21" in radius = 13.25 cm in radius ~ 30 cm in diameter

==Target Chamber design==

Latest Design From empire and Sadiq's measurement of the available space

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:EmpMagHRRLPositronTargetChamberDrw_9-20-11.png | 100 px]]||[[File:HRRLPositronTargetSpace_10-5-11.png | 100 px]] || [[File:HRRLPositronTargetCoupler_10-5-11.png | 100 px]]|| [[File:HRRLPositronTargetHub_10-5-11.png | 100 px]]
|-
| Target motor Design || Available beam line space || Motor axle coupling to rotary union || Hub and spline to attache targets
|}

Dimensions for the target chamber box. Measurements in inches. updated 11 May 2012. Holes for tubing still missing, need to measure.

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:Target_box-bottom.jpg | 100 px]]||[[File:Target_box-front.jpg | 100 px]] || [[File:Target_box-left.jpg | 100 px]]|| [[File:Target_box-iso.jpg | 100 px]]
|-
| Bottom view || Front View || Left View || Isometric View
|}

The resolution in the above image makes it too dificult to read the numbers. See if you can upload a PDF version.

=Equipment=

==Motor==

== Controller==

==Vacuum Chamber==

==Feedthroughs==

[[File:liquid_nitro_tubing.gif]]

A: 5.88
B: 3.00
C: 4.25
D: 4.63

=Performance tests=

==Heat load calculation==

[[HRRL_Positron_Rotating_W_Target]]

PositronTargetWorkByChrissJackson

2012-05-11T17:26:47Z

Jackchr2:

;Chriss Jackson's Positron Target development logbook

;Goal
: Construct a Tungsten target and vacuum enclosure to be used for generating positrons using an incident electron beam.

=Geometry=

==Tungsten Disks==

;Dimensions are in cm

[[File:HRRL_PosTargetDesign_4-20-11.png| 200 px]]

http://www.alibaba.com/product-gs/346924116/Tungsten_Disk_With_Screw.html

http://www.zlxtech.com.cn/products.asp?productcode=7401000404

http://www.cleveland-tungsten.com/

If the motor has a radius of 2.5" and I want to shield the motor from the beam using 2" of Pb and the beam is about 1" in diameter then I want a Tungsten disk that is

5.21" in radius = 13.25 cm in radius ~ 30 cm in diameter

==Target Chamber design==

Latest Design From empire and Sadiq's measurement of the available space

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:EmpMagHRRLPositronTargetChamberDrw_9-20-11.png | 100 px]]||[[File:HRRLPositronTargetSpace_10-5-11.png | 100 px]] || [[File:HRRLPositronTargetCoupler_10-5-11.png | 100 px]]|| [[File:HRRLPositronTargetHub_10-5-11.png | 100 px]]
|-
| Target motor Design || Available beam line space || Motor axle coupling to rotary union || Hub and spline to attache targets
|}

Dimensions for the target chamber box. Measurements in inches. updated 11 May 2012. Holes for tubing still missing, need to measure.

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:Target_box-bottom.jpg | 100 px]]||[[File:Target_box-front.jpg | 100 px]] || [[File:Target_box-left.jpg | 100 px]]|| [[File:Target_box-iso.jpg | 100 px]]
|-
| Bottom view || Front View || Left View || Isometric View
|}

The resolution in the above image makes it too dificult to read the numbers. See if you can upload a PDF version.

=Equipment=

==Motor==

== Controller==

==Vacuum Chamber==

==Feedthroughs==

[[File:liquid_nitro_tubing.gif]]

=Performance tests=

==Heat load calculation==

[[HRRL_Positron_Rotating_W_Target]]

File:Liquid nitro tubing.gif

2012-05-11T17:26:20Z

Jackchr2:

PositronTargetWorkByChrissJackson

2012-05-11T17:21:35Z

Jackchr2: /* Target Chamber design */

;Chriss Jackson's Positron Target development logbook

;Goal
: Construct a Tungsten target and vacuum enclosure to be used for generating positrons using an incident electron beam.

=Geometry=

==Tungsten Disks==

;Dimensions are in cm

[[File:HRRL_PosTargetDesign_4-20-11.png| 200 px]]

http://www.alibaba.com/product-gs/346924116/Tungsten_Disk_With_Screw.html

http://www.zlxtech.com.cn/products.asp?productcode=7401000404

http://www.cleveland-tungsten.com/

If the motor has a radius of 2.5" and I want to shield the motor from the beam using 2" of Pb and the beam is about 1" in diameter then I want a Tungsten disk that is

5.21" in radius = 13.25 cm in radius ~ 30 cm in diameter

==Target Chamber design==

Latest Design From empire and Sadiq's measurement of the available space

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:EmpMagHRRLPositronTargetChamberDrw_9-20-11.png | 100 px]]||[[File:HRRLPositronTargetSpace_10-5-11.png | 100 px]] || [[File:HRRLPositronTargetCoupler_10-5-11.png | 100 px]]|| [[File:HRRLPositronTargetHub_10-5-11.png | 100 px]]
|-
| Target motor Design || Available beam line space || Motor axle coupling to rotary union || Hub and spline to attache targets
|}

Dimensions for the target chamber box. Measurements in inches. updated 11 May 2012. Holes for tubing still missing, need to measure.

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:Target_box-bottom.jpg | 100 px]]||[[File:Target_box-front.jpg | 100 px]] || [[File:Target_box-left.jpg | 100 px]]|| [[File:Target_box-iso.jpg | 100 px]]
|-
| Bottom view || Front View || Left View || Isometric View
|}

The resolution in the above image makes it too dificult to read the numbers. See if you can upload a PDF version.

=Equipment=

==Motor==

== Controller==

==Vacuum Chamber==

==Feedthroughs==

=Performance tests=

==Heat load calculation==

[[HRRL_Positron_Rotating_W_Target]]

PositronTargetWorkByChrissJackson

2012-05-11T17:19:59Z

Jackchr2: /* Target Chamber design */

;Chriss Jackson's Positron Target development logbook

;Goal
: Construct a Tungsten target and vacuum enclosure to be used for generating positrons using an incident electron beam.

=Geometry=

==Tungsten Disks==

;Dimensions are in cm

[[File:HRRL_PosTargetDesign_4-20-11.png| 200 px]]

http://www.alibaba.com/product-gs/346924116/Tungsten_Disk_With_Screw.html

http://www.zlxtech.com.cn/products.asp?productcode=7401000404

http://www.cleveland-tungsten.com/

If the motor has a radius of 2.5" and I want to shield the motor from the beam using 2" of Pb and the beam is about 1" in diameter then I want a Tungsten disk that is

5.21" in radius = 13.25 cm in radius ~ 30 cm in diameter

==Target Chamber design==

Latest Design From empire and Sadiq's measurement of the available space

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:EmpMagHRRLPositronTargetChamberDrw_9-20-11.png | 100 px]]||[[File:HRRLPositronTargetSpace_10-5-11.png | 100 px]] || [[File:HRRLPositronTargetCoupler_10-5-11.png | 100 px]]|| [[File:HRRLPositronTargetHub_10-5-11.png | 100 px]]
|-
| Target motor Design || Available beam line space || Motor axle coupling to rotary union || Hub and spline to attache targets
|}

Dimensions for the target chamber box. Measurements in inches.

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:Target_box-bottom.jpg | 100 px]]||[[File:Target_box-front.jpg | 100 px]] || [[File:Target_box-left.jpg | 100 px]]|| [[File:Target_box-iso.jpg | 100 px]]
|-
| Bottom view || Front View || Left View || Isometric View
|}

The resolution in the above image makes it too dificult to read the numbers. See if you can upload a PDF version.

=Equipment=

==Motor==

== Controller==

==Vacuum Chamber==

==Feedthroughs==

=Performance tests=

==Heat load calculation==

[[HRRL_Positron_Rotating_W_Target]]

File:Target box-iso.jpg

2012-05-11T17:19:34Z

Jackchr2:

File:Target box-left.jpg

2012-05-11T17:19:17Z

Jackchr2:

File:Target box-front.jpg

2012-05-11T17:18:59Z

Jackchr2:

File:Target box-bottom.jpg

2012-05-11T17:18:20Z

Jackchr2:

PositronTargetWorkByChrissJackson

2012-05-11T17:17:59Z

Jackchr2: /* Target Chamber design */

;Chriss Jackson's Positron Target development logbook

;Goal
: Construct a Tungsten target and vacuum enclosure to be used for generating positrons using an incident electron beam.

=Geometry=

==Tungsten Disks==

;Dimensions are in cm

[[File:HRRL_PosTargetDesign_4-20-11.png| 200 px]]

http://www.alibaba.com/product-gs/346924116/Tungsten_Disk_With_Screw.html

http://www.zlxtech.com.cn/products.asp?productcode=7401000404

http://www.cleveland-tungsten.com/

If the motor has a radius of 2.5" and I want to shield the motor from the beam using 2" of Pb and the beam is about 1" in diameter then I want a Tungsten disk that is

5.21" in radius = 13.25 cm in radius ~ 30 cm in diameter

==Target Chamber design==

Latest Design From empire and Sadiq's measurement of the available space

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:EmpMagHRRLPositronTargetChamberDrw_9-20-11.png | 100 px]]||[[File:HRRLPositronTargetSpace_10-5-11.png | 100 px]] || [[File:HRRLPositronTargetCoupler_10-5-11.png | 100 px]]|| [[File:HRRLPositronTargetHub_10-5-11.png | 100 px]]
|-
| Target motor Design || Available beam line space || Motor axle coupling to rotary union || Hub and spline to attache targets
|}

Dimensions for the target chamber box. Measurements in inches.

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:Target_box-bottom.jpg | 100 px]]||[[File:Target_box-front.jpg | 100 px]] || [[File:Target_box-left.jpg | 100 px]]|| [[File:Target_box-iso.jpg | 100 px]]
|-
| Bottom view || Front View || Left View || Isometric View |}

The resolution in the above image makes it too dificult to read the numbers. See if you can upload a PDF version.

=Equipment=

==Motor==

== Controller==

==Vacuum Chamber==

==Feedthroughs==

=Performance tests=

==Heat load calculation==

[[HRRL_Positron_Rotating_W_Target]]

File:Target box-iso.JPG

2012-05-11T17:14:01Z

Jackchr2: uploaded a new version of "File:Target box-iso.JPG"

File:Target box-iso.JPG

2012-05-11T17:13:25Z

Jackchr2:

File:Target box-left.JPG

2012-05-11T17:13:11Z

Jackchr2:

File:Target box-right.JPG

2012-05-11T17:12:49Z

Jackchr2:

File:Target box-front.JPG

2012-05-11T17:12:25Z

Jackchr2:

File:Target box-bottom.JPG

2012-05-11T17:12:07Z

Jackchr2: uploaded a new version of "File:Target box-bottom.JPG"

File:Target box-bottom.JPG

2012-05-11T17:11:20Z

Jackchr2:

PositronTargetWorkByChrissJackson

2012-05-11T17:06:18Z

Jackchr2: /* Target Chamber design */

;Chriss Jackson's Positron Target development logbook

;Goal
: Construct a Tungsten target and vacuum enclosure to be used for generating positrons using an incident electron beam.

=Geometry=

==Tungsten Disks==

;Dimensions are in cm

[[File:HRRL_PosTargetDesign_4-20-11.png| 200 px]]

http://www.alibaba.com/product-gs/346924116/Tungsten_Disk_With_Screw.html

http://www.zlxtech.com.cn/products.asp?productcode=7401000404

http://www.cleveland-tungsten.com/

If the motor has a radius of 2.5" and I want to shield the motor from the beam using 2" of Pb and the beam is about 1" in diameter then I want a Tungsten disk that is

5.21" in radius = 13.25 cm in radius ~ 30 cm in diameter

==Target Chamber design==

Latest Design From empire and Sadiq's measurement of the available space

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:EmpMagHRRLPositronTargetChamberDrw_9-20-11.png | 100 px]]||[[File:HRRLPositronTargetSpace_10-5-11.png | 100 px]] || [[File:HRRLPositronTargetCoupler_10-5-11.png | 100 px]]|| [[File:HRRLPositronTargetHub_10-5-11.png | 100 px]]
|-
| Target motor Design || Available beam line space || Motor axle coupling to rotary union || Hub and spline to attache targets
|}

Dimensions for the target chamber box.

[[File:targetbox.jpg | 200 px]]

The resolution in the above image makes it too dificult to read the numbers. See if you can upload a PDF version.

=Equipment=

==Motor==

== Controller==

==Vacuum Chamber==

==Feedthroughs==

=Performance tests=

==Heat load calculation==

[[HRRL_Positron_Rotating_W_Target]]

File:Targetbox.jpg

2012-05-11T17:05:35Z

Jackchr2: uploaded a new version of "File:Targetbox.jpg"

File:Targetbox.jpg

2012-05-11T17:04:08Z

Jackchr2:

PositronTargetWorkByChrissJackson

2012-05-10T15:35:15Z

Jackchr2: /* Target Chamber design */

;Chriss Jackson's Positron Target development logbook

;Goal
: Construct a Tungsten target and vacuum enclosure to be used for generating positrons using an incident electron beam.

=Geometry=

==Tungsten Disks==

;Dimensions are in cm

[[File:HRRL_PosTargetDesign_4-20-11.png| 200 px]]

http://www.alibaba.com/product-gs/346924116/Tungsten_Disk_With_Screw.html

http://www.zlxtech.com.cn/products.asp?productcode=7401000404

http://www.cleveland-tungsten.com/

If the motor has a radius of 2.5" and I want to shield the motor from the beam using 2" of Pb and the beam is about 1" in diameter then I want a Tungsten disk that is

5.21" in radius = 13.25 cm in radius ~ 30 cm in diameter

==Target Chamber design==

Latest Design From empire and Sadiq's measurement of the available space

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:EmpMagHRRLPositronTargetChamberDrw_9-20-11.png | 200 px]]||[[File:HRRLPositronTargetSpace_10-5-11.png | 200 px]] || [[File:HRRLPositronTargetCoupler_10-5-11.png | 200 px]]|| [[File:HRRLPositronTargetHub_10-5-11.png | 200 px]]
|-
| Target motor Design || Available beam line space || Motor axle coupling to rotary union || Hub and spline to attache targets
|}

Dimensions for the target chamber box.
[[File:rotating tungsten target box.JPG]]

=Equipment=

==Motor==

== Controller==

==Vacuum Chamber==

==Feedthroughs==

=Performance tests=

==Heat load calculation==

[[HRRL_Positron_Rotating_W_Target]]

File:Rotating tungsten target box.JPG

2012-05-10T15:33:26Z

Jackchr2:

HRRL Positron Rotating W Target

2012-04-02T22:14:12Z

Jackchr2:

[[PositronTargetWorkByChrissJackson]]

=Target Construction=

Current beam line distances for target to be inserted into

[[File:hrrl_e+_Target_area_Space.png | 400 px]]

==Motor==

[[File:HRRL_Beam_Rot_Tar_Sys_Mot1.png | 400 px]]

Empire Magnetics Model U42

;Wiring Diagram:[[Media:U-42EmpireMagneticsMotorWiringDiag.pdf]]

==Motor Controller==

===Power supply===

[http://www.lamonde.com/acatalog/Products_Power_Supplies_992.html#aSTP_2dPWR_2d4810 Power Supply STP-PWR-4810 Power supply for stepping systems, dual output with 48 VDC @ 10A (at full load) unregulated and 5 VDC at 0.5A regulated.]

===STR8 ===

[[file:STR8.png | 300 px]]

STR8 Manuals:

[[Media:STR_Hardware_Manual.pdf]]

[[Media:STR_Quick_Setup_Guide.pdf]]

Datasheet:

[[Media:STR_Brochure_925-0002_RevC.pdf]]

=Design=
==45 degree angle==

The Tungsten target should make a 45 degree angle with the beam.

make the motor so it can be rotated.

==Beam Heat Load==

;Accelerator Settings
{| border="1"
| beam energy || 10 MeV
|-
| Rep Rate: || 300 Hz
|-
| I_peak: || 200 mA/pulse
|-
| pulse width:|| 0.1 <math>\mu</math>s (100 ns)
|-
| Vacuum:|| <math>10^{-8}</math> Torr
|-
|}

: <math>200 \frac{\mbox{mA}}{\mbox{pulse}} \times 300 \frac{\mbox{pulses}}{\mbox{sec}} \times 0.1 \mu \mbox{s}= 60 \mu A</math>

Time on for one second is 30 us. and Time off is 0.999999 s The average current 0.999999 * 0 + 0.000001*300*200mA =
60<math>\mu</math>A.

''P'' = (10 MeV) <math>\times</math> (60 <math>\mu</math>A) = 600 Watts.

==Target Chamber design==

Latest Design From empire and Sadiq's measurement of the available space

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:EmpMagHRRLPositronTargetChamberDrw_9-20-11.png | 200 px]]||[[File:HRRLPositronTargetSpace_10-5-11.png | 200 px]] || [[File:HRRLPositronTargetCoupler_10-5-11.png | 200 px]]|| [[File:HRRLPositronTargetHub_10-5-11.png | 200 px]]
|-
| Target motor Design || Available beam line space || Motor axle coupling to rotary union || Hub and spline to attache targets
|}

;Dimensions are in inches

[[File:HRRLPositronTargetChamber_4-20-11.png | 200 px]]

There is an 18" space in Z for the target chamber. If you want to rotate a disk on the 5" wide motor you will need at least a a 10" x 10" area.

So we could try as a first design a chamber which is 18" x 15" x 15".
We need the following

*2 beam flanges flush with the walls of the chamber.
*2 flanges to allow access for hands to work on the target motor inside. It should able to fit hands through.
*a flange on top which will allow a 10" diameter target disk to come out.
*a flange on the bottom for the ion pump.

July Design From empire

[[File:EmpMagHRRLPositronTargetChamberDrw_7-25-11.png | 200 px]]

{| border="1" cellpadding="20" cellspacing="0"
|-
|[[File:EmpMagHRRLPositronTargetChamberPict_7-25-11.png | 200 px]]||[[File:EmpMagStatorCoolLines_7-26-11.png | 200 px]]
|-
| Rotary Union overlayed on conceptual drawing. || Conceptual drawing of stator cooling lines. We will need separate connection to them on the vacuum chamber.
|}

==Gate Valve - Target distance==

The distance from the front of the gate valve to the most beam upstream part of the target chamber is

88.43 cm

The gate valve closes in 0.7 sec.

So water would need to travel at a speed of 88.43 cm/0.7 sec = 1.26 m/sec

== Properties of Tungsten==

*Melting Point = 3695 K.

*Heat Capacity = <math>(25~ ^{o}C)~ 24.27 ~ J ~ mol^{-1} ~ K^{-1}</math>

*These data are from: [http://en.wikipedia.org/wiki/Tungsten Tungsten]

*Heat loss due to radiation: ( \sigma T^4)

==Tungsten Temperature as a function of heat load==

*IAC beamline pressure = <math>10^{-8} </math> Torr

*The Tungsten heats up when an MeV energy electron impinges its surface. The imperfect vacuum inside the beam pipe does allow some radiative cooling.

*Conduction and Radiation

==Calculating Radiators Equilibrium Temperature==

===1.Calculating number of particles per second ===

We have electron beam of:

Frequency: f=1000Hz

Peak current: I=10~mAmp=0.01 Amp

Pulse width: <math> \Delta t= 50~ns=5 \times10^{-8}</math> seconds

So, how many electrons we have in each second?

By Q=It, we have

<math> N \times e=f \times I \times \Delta t </math>

Where N is the total electron numbers hits target per second, e is electron charge and f, I and ∆t are given above. Number of particle per second is:

<math> N = \frac {f \times I \times \Delta t}{e} </math>

===2.Calculating Energy deposited per second===

If we find the energy deposited by each electron and multiply to the total number of electrons in each second, we will find the total energy per second deposited in radiator.

To find energy deposited by each electron, we need to use formula

<math> E_{dep~one}={(\frac{dE}{dx})}_{coll}\times t </math>

Where is <math> E_{dep~one} </math> is energy deposited by one electron, <math> {(\frac{dE}{dx})}_{coll} </math> is mean energy loss (also stopping power) by collision of electron and <math> t </math> is thickness of the radiator.

Actually, energy loss of a electron comes from two parts: 1) the emission of electromagnetic radiation arising from scattering in the electric field of a nucleus (bremsstrahlung); 2) Collisional energy loss when passing through matter. Bremsstrahlung will not contribute to the temperature, because it is radiation.

Stopping power can be found from nuclear data tables <math> (dE/dx)_{ave} </math> and thickness is 0.001 times of radiation length. From Particle Data group we got radiation length and average total stopping powers around 15MeV for electrons in these materials from National Institute of Standards and Technology: [http://physics.nist.gov/PhysRefData/Star/Text/ESTAR.html Tungsten Stopping Power].

====Table of Radiation Lengths====
Note:These data is from Particle Data group,Link: [http://pdg.lbl.gov/AtomicNuclearProperties/].

{| border="1" cellpadding="20" cellspacing="0"

|-
|Elements
|Radiation Lengths <math> (g/cm^{2} )</math>
|-
|W || 6.76
|-
|}<br>

====Table of energy calculations====
For the thickness of 0.001 Radiation Length (0.0001RL) of radiators.
Note: <math>(dE/dx)_{coll}</math> is from National Institute of Standards and Technology. Link: [[http://physics.nist.gov/PhysRefData/Star/Text/ESTAR.html]])
{| border="1" cellpadding="20" cellspacing="0"
|-
|Elements
|<math>(dE/dx)_{coll} (MeV \; cm^2/g)</math>
|<math> t~( g~cm^{-2}</math>)
|<math>E_{(dep~one)}</math> (MeV)
|<math>E_{dep/s}</math> (MeV/s)
|<math>E_{dep/s}</math> (J/s)
|-
|W ||1.247 ||0.00676 ||0.00842972 ||<math>2.63*10^{10}</math> ||<math>4.21*10^{-3}</math>
|-
|}

In above table,we took the total numbers of electrons per second and multiply it to Energy deposited by one electron,get total energy deposited per second (which is power).

<math>P_{dep}= E_{dep}/s = ( E_{(dep~by~one)})\times(Number~of~electrons~per~second)</math>

===3.Calculating equilibrium temperature using Stefan–Boltzmann law===
If we assume that there is no energy conduction and total energy is just radiated from two surfaces of the radiators which are as big as beam spot,in our case beam spot is 2mm in diameter. According to Stefan–Boltzmann law, this total power radiated will be

<math> P_{rad} = A \sigma T^{4} </math>

Where T is radiating temperature P is the radiating power, A is surface area that beam incident and σ is Stefan–Boltzmann constant or Stefan's constant. To reach equilibrium temperature, Power deposited in and power radiated should be. So
<math> P_{dep}=P_{rad} </math>

so

<math> T = [ \frac{P_{dep}}{A\sigma} ]^{1/4} = [ \frac{N*E_{(dep~one)}}{A\sigma} ]^{1/4} </math>

==Vendors==

===MDC Target Chamber===

Target chamber: MDC vacuum products can send a prefab one you just need to weld up.

John Brooks

jbrooks@mdcvacuum.com

1-800-443-8817

or

510-265-3569

[[File:TargetChamberDesign_1.0.pdf]]

Tom Bogden (John's boss)

MDC does not have a fast closing gate valve. Model GV1500 closes in 0.7 seconds and costs $1600. One that closes in 10 msec costs about $10k

===Tungsten Disks===

;Dimensions are in cm

[[File:HRRL_PosTargetDesign_4-20-11.png| 200 px]]

http://www.alibaba.com/product-gs/346924116/Tungsten_Disk_With_Screw.html

http://www.zlxtech.com.cn/products.asp?productcode=7401000404

http://www.cleveland-tungsten.com/

If the motor has a radius of 2.5" and I want to shield the motor from the beam using 2" of Pb and the beam is about 1" in diameter then I want a Tungsten disk that is

5.21" in radius = 13.25 cm in radius ~ 30 cm in diameter

Then density of Tungsten is

19.25 g/cm^3

19.25 g/cm^3 \times \pi (30 cm)^2 = 54,428 g/cm

= 8.7 kg if it is 0.16 cm thick

The moment of inertia for a disk about its center is MR^2/2

So I = 8.7kg \times (0.3 m)^2/2 = 0.4 kg m^2

I should look into a ring of tungsten attached to a less dense material.

VX-U42 torque is about 50 in-lbs = 5.65 N m

Max acceleration would be

<math>\alpha = \frac{5.65 N m}{0.4 kg m^2} = 14.4 rad/sec \times \frac{1}{2 \pi} = 2.3 cycles/sec</math>

===Brushless Motor===

====Motor wiring diagram====

[[Media:U-42EmpireMagneticsMotorWiringDiag.pdf]]

Rick Halstead

5830 Commerce Blvd

Rohnert Park, CA 94928

Phone: 707-584-2801

Fax: 707-584-3418

rick@empiremagnetics.com:

The VX grade motors, with dry lubes have been used in deep space (Wake
Shield Module) where I'm told they were trying to get 10^-12 torr.

We need 10^{-8 }Torr

Vacuum lab grade motor U42.

http://www.empiremagnetics.com/prod_vac/prod_vac_vx_stepper_frame42.htm

Tony: Some of the couplings I had in mind:
http://www.sdp-si.com/estore/CoverPg/Couplings.htm

http://www.servometer.com/products/couplings/

I'm thinking the coupler with adaptation of a compression seal.
http://www.jaecofs.com/stainless-steel-compression-fittings.html

The challenge will be to get them to make a version that can be sealed
at each end, technically it is feasible, it's an issue of engineering
resource to chase them down, get a quote then propose it to you, so
you can get funding.

====Motor COntroller====

Jason Brickner
Olympus Controls
Tel. 208.475.4670 | Email jbrickner@olympus-controls.com

====Torque====

The MRI rotary Unions require 2 in-oz of torque each

The U42 has a minimum static torque of 375 in-oz (1 Nm/8.851 oz-in) = 42.4 Nm

The Momentum of inertia of a thin disk about its axial axis is

:<math>MR^2/2</math>

Moment of Inertia of a ring:

:<math>MR^2</math>

The target will be a disk of Aluminum with an outer ring of tungsten.

<math>I_{\mbox{Al disk}} =M_{\mbox{Al}} R^2</math>

<math>M_{\mbox{Al}}= \rho \times V = 2.7 g/cm^3 (0.2 cm) \times \pi ( 9 in 2.54 cm/in)^2 =2.7 g/cm^3 0.2 cm \pi 523 cm^2 = 886 g</math>

<math>I_{\mbox{Al disk}} =886 g \times 523 cm^2 = 463423 g cm^2 \times (1 oz/28 g) (1 in/2.54 cm) (1in/2.54 cm) = 2565 oz-in^2
</math>

<math>Torque = 42.4 Nm = I \alpha</math>

\alpha = 42.4 Nm/(0.04 kg m^2))=1060 rad/sec^2

I_{\mbox{W}} = MR^2 =

<math>M_{\mbox{W ring}} = 19.25 g/cm^3 \times \pi ((30 cm)^2 - (28.5 cm)^2) = 5.3 kg = 11.7 lbs</math>

<math>I = 5.3 kg \times 29 cm^2 = 0.4457 kg m^2</math>

<math>I_{tot} = I_{\mbox{Al disk}} + I_{\mbox{W}} = (0.04 + 0.4457) kg m^2</math>

<math>\alpha = 42.4 Nm/(0.49 kg m^2) = 87 rad/s^2</math>

How much time to accelerate to 50 Hz = <math>50 *2 *\pi</math> rad/sec?

<math>\omega_f = \alpha t^2/2</math>

<math>t = \sqrt{\frac{2 \omega_f}{\alpha}} =\sqrt{\frac{2 50 8 2 *\pi}{87}} = 4.2</math> seconds

===Rotary coupler/Union===

====ORNL rotating tungsten target====

Full Name: Thomas J. McManamy

Email Address: mcmanamytj@ornl.gov

Phone Number: 865-576-0039

Fax Number: 865-241-6909

Postal Address: OAK RIDGE NATIONAL LABORATORY

PO BOX 2008 MS6476

OAK RIDGE TN 37831-6476

http://www.ornl.gov/info/reporter/no116/nov09_dw.htm#revolution

====DSTI====

http://www.dsti.com/products/?gclid=CPWEvP6ogagCFRs5gwod6SSXtA

Brett Villella
brett.villella@dsti.com

Dynamic Sealing Technologies, Inc.

13829 Jay Street NW

Andover, MN 55304

Direct: 763-404-8021

Main: 763-786-3758

Fax: 763-786-9674

Web: www.dsti.com

Model: SPS-5510-R.A , a single pass rotary union, the input connector is 3/4" diameter as shown in the drawing below.

The minimum torque needed to rotate base on zero pressure is 4 in-lbs.

[[File:SinglePassRotaryUnionDSTi_v1.pdf]]

The target chamber design should be able to accommodate a 4" = 3.14+ 1" length in order to accept a rotary union which works at liquid nitrogen temperatures. The above single pass rotary union is good to -25F according to the company.

Place order for 2 with Michel @ 763-404-8024

====gat====

The guy from Empiremagnetics says that the ferofluid used in the unions below becomes stiff at low temperatures causes too much load on the motors.

http://www.gat-mbh.de/index.php?page=rotovac-en&group=produkte-en:rotating_unions-en

http://www.tengxuan.net/old/product.asp?Catalog=8

http://www.rotarysystems.com/?gclid=CID4r6z22acCFQM6gwodoQVQ9w
http://rotarysystems.com/series-006

===Motor Controller===

http://www.centent.com/

=Target specifications=

The U42 motor has a 4.2 inch diameter. With a 2" Pb brick for shielding this would put the target radiu to at least (2.1 + 2 + 1) 5.1 inches.

=== Moment of Inertia===

<math>I_{Disk} = \frac{1}{2} MR^2</math>

<math>I_{Hoop} = \frac{1}{2} M(R_1^2 +R_2^2)</math>

R= 32 cm = 12.6 inches.

===Torque===

===Rotational Speed===
====Mechanical design====

An Aluminum disk will be machined to have several Tungsten targets attached.

The disk has a radius of about 5.1 inches. The circumference will be 2 \pi r \approx 45 inches. If the targets are 1" wide with 1" gaps, then you will have about 20 targets.

If you rotate the target at 1 Hz then in one second you can hit 20 targets. This means your rep rate can be 20 Hz.

If you rotate the target at 50 Hz then your rep rate can be 1 kHz.

But since you will have 20 gaps (empty target positions) then you could run at 2 kHz.

So a target rotating 25 Hz can accept a rep rate of 1 kHz.

The HRRL easily runs at 300 Hz. For a target with 20 foils you would run the motor at 300/40 = 7.5 Hz.

====Heat load====
You will need at least 2 holes in the Tungsten disk which you can use as an empty target. The Max pulse rate of the Linac is 1 kHz. So a 500 Hz motor would be the Max speed needed if you have 2 Windows.

How long can a 1.6 mm thick piece of Tungsten that has an area of 2.5" x 2.5" be in a 600 Watt heat source before melting.

Specific Heat Capacity = <math> 130 \frac{J}{kg K}</math>

Thermal Conductivity = <math> 173\frac{W}{m K}=100\frac{BTU}{hr ft F}</math>

The Melting point of Tungsten is 3600 Kelvin.

density = 19.25<math>\frac{g}{cm^3}</math>

Volume = <math>(.16 cm)(2.5 cm)^2 = 1 cm^3</math>

Mass = <math>1 cm^2 \times 19.25 g/cm^3 = 19.25 g

:<math>Q = C_m m \Delta T = 130 \frac{J}{kg K} \times 0.967 kg \times (3600-300 K) = 414843 J = 600 J/s *t </math> Watt = J/s
:: <math>\Rightarrow t= 691 seconds.</math>

If Zinc

: C_m = 0.39 J/g/K Density = 7.13 g/cm^3 \Right arrow M = 7.13 \times 50.3 = 358 g, Melting point 693 K
:Q = 0.39 \times 0.358 \times 393 = 55 Joules = 10^3 Watts * t \Rightarrow t = 0.055 s \Rightarrow 18 Hz.

Now You need to calculate how quickly water can absorb heat

;Water properties
:C_m = 4.12 J/g/K , Density = 1 g/cm^3 assuming aflow rate of 1 liter/sec \Rightarrow mass = 1 g, Boiling point water = 373.15

Tungsten's specific heat capacity is about 30 times larger than water. So for the same mass and power input water's temperature will change a factor of 30 more than tungsten.

In 1 second Tungsten's temperature change will be
:\frac{600 J}{130 \times 0.967} = 5K

Copper coils which have water flowing through them are soldered to the Tungsten. The water is a heat sink transferring heat from the Tungsten to the water.

;Heat transfer by conduction
:<math>\frac{Q}{t} = \frac{\kappa A \Delta T}{d}</math>
:<math>\kappa \equiv</math> Heat Conductivity

==Sadiq's Calculation ==

Moment of inertia of a cylinder rotating in with z axis:

<math> I = \frac{m r^2}{2} = \frac{\rho \times V r^2}{2} = \frac{\rho \times \pi r^2 h \times r^2}{2} = \frac{\rho \pi r^4 h}{2} </math>

<math>\alpha = \frac{d w}{dt} = \frac{d^2\theta}{dt^2} = \frac{\tau}{I} </math>

<math> w = \frac{\tau}{I}t + w_0 </math>

<math> \theta = \frac{1}{2} \frac{\tau}{I} t^2 + w_0 t + \theta_0 </math>

Angular change due to acceleration is:

<math> \Delta \theta = \frac{1}{2} \frac{\tau}{I} t^2 + w_0 t + \theta_0 - ( w_0 t + \theta_0) = \frac{1}{2} \frac{\tau}{I} t^2 </math>

Position change at some distance R from the center is

<math> \Delta l = \Delta \theta R = \frac{1}{2} \frac{\tau}{I} t^2 R</math>

<math> \Delta l = \frac{1}{2} \frac{\tau}{I} t^2 R</math>

Assume we just have one disk, and we are looking for position change at the radius, r=R. We are also looking at the the position change after one revolution, t = T.

<math> \Delta l = \frac{1}{2} \frac{\tau}{\frac{\rho \pi r^4 h}{2}} T^2 r = \frac{\tau}{\rho \pi r^3 h} \frac{1}{f^2} </math>

<math> f^2 r^3 = \frac{\tau}{\rho \pi h} \frac{1}{\Delta l } </math>

or

<math>f^2 r^3 \Delta l = \frac{\tau}{\rho \pi h} </math>

=== Rough Estimation ===

100 oz-in = 0.706154 N*m

<math> \tau = 400~oz-in = 2.82462~N*m </math>

<math> \rho_{Al} = 2.7 ~g~ cm^{-3} = 2.7 \times 10^3 ~kg~ m^{-3}</math>

We choose:

<math> h = 1~inch = 0.0254 ~m</math>

<math> \Delta l = \frac{1}{4}~inch = 0.00635 ~m</math>

<math> f^2 r^3 = \frac{2.82462~N*m}{(2.7 \times 10^3 ~kg~ m^{-3} )\times 3.14 \times (0.0254 ~m)} \times \frac{1}{0.00635 ~m } = 2.0656616 </math>

<math> f^2 r^3 = 2.0656616 </math>

<math> r^3 = \frac{2}{f^2} </math>

<math> r = ( \frac{2}{f^2} ) ^ {1/3}</math>

Which means: If out motor has a torque of <math> 400~oz-in </math>, and rotating a 1 inch thick cylindrical aluminium plate, to move a point outer edge of the plate, forward or backward, 1/4 inch in next revolution, the radius and frequency of the plate should satisfy:

<math> r^3 = \frac{2}{f^2} </math>

{| border="1" |cellpadding="20" cellspacing="0
|-
|r (cm) || r (inch) || Circumference (in) || #tar (Number of 1-inch-targets can be mounted on the disk) || Rep rate (Hz) ||
|-
| 43.1 || 17.0 || 106.56 || 53 || 5 ||
|-
| 27.1 || 10.7 || 67.00 || 33 || 10 ||
|-
| 17.2 || 6.8 || 42.53 || 21 || 20 ||
|-
| 13.0 || 5.1 || 32.14 || 16 || 30 ||
|-
| 10.8 || 4.3 || 26.70 || 23 || 40 ||
|-
| 9.3 || 3.7 || 22.99 || 11 || 50 ||
|-
| 8.2 || 3.2 || 20.27 || 10 || 60 ||
|-
| 7.4 || 2.9 || 18.30 || 9 || 70 ||
|-
| 6.8 || 2.6 || 16.81 || 8 || 80 ||
|-
| 6.27 || 2.5 || 15.50 || 7 || 90 ||
|-
| 5.85 || 2.2 || 14.46 || 7 || 100 ||
|-
| 3.68 || 1.45 || 9.10 || 4 || 200 ||
|-
| 2.81 || 1.11 || 6.95 || 3 || 300 ||
|-
| 2.0 || 0.787 || 4.94 || 2 || 500 ||
|-
| 1.25 || 0.492 || 3.09 || 1 || 1000 ||

|}

==Q==
Q: Does the W target has to be in the vacuum?
What if we have it in the air, at the ends of the beam line we have very thin vacuum window?
In photofission experiment we had 1 mil vacuum window. under
15 MeV e- beam, only 1/1000 electron will interact with the window, produce bremsstrahlung photon.

Q: Can we make positron target that is inner part of the vacuum box, then we rotate all the box. Heat will be transfered to box,
box can cooled by water from outside.
May be box does not have to rotation movement? I can do other moments like up-down and right-left.

I think we can make a Tungsten target as a part of the beam line. That means outer part Tungsten target will be beam pine.
Then we can use water cooling to cool our Tungsten target from outside.
Before we had all the electrons hitting Faraday Cup, which did not melt the copper even when there was not cooling water
circling around FC.
Tungsten has higher melting point, plus we run cooling water around Tungsten target, then Tungsten shouldn't melt.

The first version of a positron converter target will be designed to distribute the heat load by rotating the tungsten target.

Calculate for 1 mm and 2 mm thick Tungsten

Look for Tungsten disks to attach to brushless motor and fit into beam pipe

Go Back [[Positrons]]

PositronTargetWorkByChrissJackson

2012-03-14T18:29:38Z

Jackchr2:

PositronTargetWorkByChrissJackson

2012-03-14T18:28:41Z

Jackchr2:

PositronTargetWorkByChrissJackson

2012-03-14T18:26:11Z

Jackchr2: