Difference between revisions of "Beam Test Apr 24 2012"

From New IAC Wiki
Jump to navigation Jump to search
 
(2 intermediate revisions by the same user not shown)
Line 223: Line 223:
  
  
−
==== MeV Setting ====
+
==== 4-5 MeV Setting ====
  
 
Energy switch changed to low energy setting. Part of the cavity is grounded.
 
Energy switch changed to low energy setting. Part of the cavity is grounded.
Line 266: Line 266:
 
|Q6  (A)|| 0
 
|Q6  (A)|| 0
 
|-
 
|-
−
|  Peak Current on FC    || 73.2 mAmps
+
|  Peak Current on FC    || mAmps
 
|-
 
|-
−
|  Scope on FC  ||  [[File:hrrl_24Apr2012_EnTest_14MeV_FC_cur.png | 200 px]]
+
|  Scope on FC  ||  [[File:hrrl_24Apr2012_EnTest_4MeV_FC_cur.png | 200 px]]
 
|-
 
|-
 
|-
 
|-
−
| Beam Spot ||  [[File:hrrl_24Apr2012_EnTest_14MeV_beam_im.png | 200 px]]  
+
| Beam Spot ||  [[File:hrrl_24Apr2012_EnTest_4MeV_beam_im.png | 200 px]]  
 
|}
 
|}
  
−
== Quad Test ==
 
  
−
 
+
Gun has been up to air for 3 times. It could be oxidation, contamination. Or it could be gun died, less likely. Roasting the gun to burn off the contamination is an idea. Chad just roasted gun for with higher current, we saw gun current increased many times. We will leave roasted for one night.
−
=== Tune HRRL ===
 
−
Tune to following settings, observe beam. Check if there is mis-steering by quadrupole magnet.
 
−
 
 
−
This tune used for quad scan at Mar 17 2011, tuned by Dr. Kim.
 
−
 
 
−
{| border="1"
 
−
| Solenoid 1    || 6.8 A
 
−
|-
 
−
|Solenoid 2      ||  10.4 A
 
−
|-
 
−
|Gun Ver        || -0.2 A
 
−
|-
 
−
| Gun Hor        || +0.4 A
 
−
|-
 
−
|Output Hor      || -1.4A
 
−
|-
 
−
| Output Ver    || -0.5 A
 
−
 
 
−
|-
 
−
|  Gun HV  || +9.75 (Knob Setting)
 
−
|-
 
−
|  Gun Grid Voltage  || 5.25 (Knob Setting)
 
−
|-
 
−
|  RF frequency  || 2855.816 MHz
 
−
|-
 
−
|  Modulator HV Power Supply  || 4.42 (Knob Setting)
 
−
|-
 
−
|  RF macro Pulse Length (FWHM)  || 200 ns
 
−
|-
 
−
|  Peak Current on FC    || 37.2 mAmps
 
−
|-
 
−
|  Scope on FC  || [[File:Scope_image_of_good_Accelarator_setting_by_Dr._Kim_Mar_17_2011.png | 100 px]]
 
−
|-
 
−
|  e- Beam Energy  || 14 MeV
 
−
|}
 
−
 
 
−
=== Test mis-steering ===
 
−
 
 
−
Use OTR screen observe the beam. Turn all the quads off, except one at time. Change quad currents, see if mis-steering happens.
 
−
 
 
−
{| border="1"
 
−
|  Quad  || Is there mis-steering? || Beam images for different quad coil currents
 
−
|-
 
−
|  Q1    ||      ||    [[File:hrrl_24Apr2012_QTest_q1_1Amp.png | 200 px]]  [[File:hrrl_24Apr2012_QTest_q1_3Amp.png | 200 px]] [[File:hrrl_24Apr2012_QTest_q1_5Amp.png | 200 px]]
 
−
|-
 
−
|  Q2    ||      ||    [[File:hrrl_24Apr2012_QTest_q2_1Amp.png | 200 px]]  [[File:hrrl_24Apr2012_QTest_q2_3Amp.png | 200 px]] [[File:hrrl_24Apr2012_QTest_q2_5Amp.png | 200 px]]
 
−
|  Q3    ||      ||    [[File:hrrl_24Apr2012_QTest_q3_1Amp.png | 200 px]]  [[File:hrrl_24Apr2012_QTest_q3_3Amp.png | 200 px]] [[File:hrrl_24Apr2012_QTest_q3_5Amp.png | 200 px]]
 
−
|-
 
−
|  Q4    ||      ||    [[File:hrrl_24Apr2012_QTest_q4_1Amp.png | 200 px]]  [[File:hrrl_24Apr2012_QTest_q4_3Amp.png | 200 px]] [[File:hrrl_24Apr2012_QTest_q4_5Amp.png | 200 px]]
 
−
|-
 
−
|  Q5    ||      ||    [[File:hrrl_24Apr2012_QTest_q5_1Amp.png | 200 px]]  [[File:hrrl_24Apr2012_QTest_q5_3Amp.png | 200 px]] [[File:hrrl_24Apr2012_QTest_q5_5Amp.png | 200 px]]
 
−
|  Q6    ||      ||    [[File:hrrl_24Apr2012_QTest_q6_1Amp.png | 200 px]]  [[File:hrrl_24Apr2012_QTest_q6_3Amp.png | 200 px]] [[File:hrrl_24Apr2012_QTest_q6_5Amp.png | 200 px]]
 
−
|}
 
−
 
 
−
= Emittence Test (If time allows?) =
 
−
 
 
−
==Tune HRRL establish stable beam ==
 
−
 
 
−
1. Looking at the beam position on the screen and by the beam current on FC, try to align beam line. The goal is to center the beam on the screen, and maximize the FC charge as high as possible.
 
−
 
 
−
2. Reduced the mis-steering at the quadrupole by tuning steerers in the linac.
 
−
 
 
−
3. Optimize steerers, solenoids in linac to get a round electron beam shape and no steering at the quadrupole.
 
−
 
 
−
4. One good tune earlier for reference: [[https://wiki.iac.isu.edu/index.php/HRRL_03-17-2011#Good_Tune_Used_for_good_Scan Tune HRRL]]
 
−
 
 
−
== 10 MeV ==
 
−
 
 
−
Energy is set by bending the beam to dipole at specific current.
 
−
 
 
−
Set dipole current for 10 MeV, and bend the beam. Tune the beam energy, until we see peak current at the 45 degree Faraday cup.
 
−
 
 
−
=== Emittance measurement at 10 MeV ===
 
−
 
 
−
This is scan for 10 MeV beam. 40 mAmps peak current. Q1 is on, All other quads are off.
 
−
 
 
−
1) Scan from -5 Amps to 5 Amps. Increment at 0.2 Amps.
 
−
 
 
−
3) Name images by numbers start from 1. Then go on. Like: -5 Amp is 1, -4.8 Amp is 2, and so on til 5 Amp is named 51.
 
−
 
 
−
4) Scan multiple times from -5 to 5 Amps, and put them in different folders. Name folder by number, like 1, 2, 3 etc. After finishing one scan go back to -5 Amps. When going back take small steps (like 1 Amp), do not jump from 5 Amps to -5 Amps directly. After reaching back to -5, wait for few moment (like 10 s).
 
−
 
 
−
5) For each time, take back ground images. It should be done when RF is on and gun is off.
 
−
 
 
−
6) After the scan take a scope image for the current of the FC after the OTR screen. Lower the current, so the vacuum window do not heat up. This step is to check energy.
 
−
 
 
−
== 15 MeV ==
 
−
 
 
−
Energy is set by bending the beam to dipole at specific current.
 
−
 
 
−
Set dipole current for 15 MeV, and bend the beam. Tune the beam energy, until we see peak current at the 45 degree Faraday cup.
 
−
 
 
−
=== Emittance measurement at 15 MeV===
 
−
 
 
−
 
 
−
== 3 MeV ==
 
−
 
 
−
Energy is set by bending the beam to dipole at specific current.  
 
−
 
 
−
Set dipole current for 15 MeV, and bend the beam. Tune the beam energy, until we see peak current at the 45 degree Faraday cup.
 
−
 
 
−
=== Emittance measurement at 3 MeV===
 
−
 
 
−
 
 
−
 
 
−
== 7 MeV ==
 
−
 
 
−
Energy is set by bending the beam to dipole at specific current.
 
−
 
 
−
Set dipole current for 7 MeV, and bend the beam. Tune the beam energy, until we see peak current at the 45 degree Faraday cup.
 
−
 
 
−
=== Emittance measurement at 3 MeV===
 

Latest revision as of 21:40, 24 April 2012

Getting Ready Punchlist

1) Get matlab ready for emittance measurement. (Not done due to Matlab licence issue) 

(Done) 2) Install control box. 
(Done) 3) Clean up imaging system.
(Done) 4) Determine dipole current setting.

Test List

Energy Test

1. Chad tunes HRRL

4.11

RF: 2857.351


MOD HVPS RF FC1
4.11 (nob) 2857.351 34.2 mA

Test beam stability at different energies

Start from 2 MeV go up energy.

Assuming magnet polarity swith "up" as positive and "down" as negative.

16 MeV

e- Beam Energy (estimate) 16 MeV
Solenoid 1 16.2 A
Solenoid 2 0 A
Gun Ver -0.2 A
Gun Hor 0 A
Output Hor -0.3 A
Output Ver -1.2 A
Gun HV (Knob Setting)
Gun Grid Voltage (Knob Setting)
RF frequency 2856.382 MHz
Modulator HV Power Supply 4.98 (Knob Setting)
RF macro Pulse Length (FWHM) 300 ns
Q1 (A) 0
Q2 (A) 0.6
Q3 (A) 0
Q4 (A) +10
Q5 (A) -7
Q6 (A) -5
Peak Current on FC 135 mAmps
Scope on FC 200 px
Beam Spot 200 px

14 MeV

e- Beam Energy (estimate from 2011 Mar setting) 14 MeV (with big power supply Check with chad)
Solenoid 1 16.2 A
Solenoid 2 0 A
Gun Ver -0.2 A
Gun Hor 0 A
Output Hor -0.3 A
Output Ver -1.2 A
Gun HV (Knob Setting)
Gun Grid Voltage (Knob Setting)
RF frequency 2856.382 MHz
Modulator HV Power Supply 4.40 (Knob Setting)
RF macro Pulse Length (FWHM) 300 ns
Q1 (A) 0
Q2 (A) 0
Q3 (A) 0
Q4 (A) +10
Q5 (A) -7
Q6 (A) -4
Peak Current on FC 88 mAmps
Scope on FC 200 px
Beam Spot 200 px


10 MeV First Setting

e- Beam Energy ()
Solenoid 1 16.2 A
Solenoid 2 0 A
Gun Ver -0.2 A
Gun Hor 0 A
Output Hor -0.3 A
Output Ver -1.2 A
Gun HV (Knob Setting)
Gun Grid Voltage (Knob Setting)
RF frequency 2856.382 MHz
Modulator HV Power Supply 4.40 (Knob Setting)
RF macro Pulse Length (FWHM) 300 ns
Q1 (A) 0
Q2 (A) 0
Q3 (A) 0
Q4 (A) +10
Q5 (A) -7
Q6 (A) -4
Peak Current on FC 88 mAmps
Scope on FC 200 px
Beam Spot 200 px

10 MeV Second Setting- Saidq's Tune

e- Beam Energy () 10 MeV
Solenoid 1 7.2 A
Solenoid 2 2.9 A
Gun Hor 0 A
Gun Ver 0 A
Output Hor -0.2 A
Output Ver 0.3 A
Gun HV 10.00 (Knob Setting)
Gun Grid Voltage 10.00 (Knob Setting)
RF frequency 2856.373 MHz
Modulator HV Power Supply 4.20 (Knob Setting)
RF macro Pulse Length (FWHM) 300 ns
Q1 (A) 0
Q2 (A) 0
Q3 (A) 0
Q4 (A) 0
Q5 (A) 0
Q6 (A) 0
Peak Current on FC 73.2 mAmps
Scope on FC 200 px
Beam Spot 200 px


4-5 MeV Setting

Energy switch changed to low energy setting. Part of the cavity is grounded.

Energy Switch In (Part of the cavity is grounded, HRRL low energy operation mode )
e- Beam Energy () 4-5 MeV
Solenoid 1 7.2 A
Solenoid 2 2.9 A
Gun Hor 0 A
Gun Ver 0 A
Output Hor -0.2 A
Output Ver 0.3 A
Gun HV 10.00 (Knob Setting)
Gun Grid Voltage 10.00 (Knob Setting)
RF frequency 2856.373 MHz
Modulator HV Power Supply 4.00 (Knob Setting)
RF macro Pulse Length (FWHM) 300 ns
Q1 (A) 0
Q2 (A) 0
Q3 (A) 0
Q4 (A) 0
Q5 (A) 0
Q6 (A) 0
Peak Current on FC mAmps
Scope on FC 200 px
Beam Spot 200 px


Gun has been up to air for 3 times. It could be oxidation, contamination. Or it could be gun died, less likely. Roasting the gun to burn off the contamination is an idea. Chad just roasted gun for with higher current, we saw gun current increased many times. We will leave roasted for one night.

Retrieved from "https://wiki.iac.isu.edu/index.php?title=Beam_Test_Apr_24_2012&oldid=73628"