Difference between revisions of "CHIPS IAC Run 5-28-08"

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Delay from gun is about 400 ns
 
Delay from gun is about 400 ns
 
gate width between 400 and 800 ns
 
gate width between 400 and 800 ns
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= Beam Scans =
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== '''Zero Degree Port.''' ==
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Beam spot at the Zero Degree Port as a function of grid voltage knob setting -- not calibrated to voltage but reproducible.  (Settings: 0.1, 0.15, 0.18, 0.2)
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[[Image:ZeroPort_10MeV_Gun2keV_Grid_0.1.jpg | 200 px]]
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[[Image:ZeroPort_10MeV_Gun2keV_Grid_0.15.jpg | 200 px]]
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[[Image:ZeroPort_10MeV_Gun2keV_Grid_0.18.jpg | 200 px]]
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[[Image:ZeroPort_10MeV_Gun2keV_Grid_0.20.jpg | 200 px]]
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The 0.15 grid setting is nice.  It does not saturate.  Here we take slices in x and y and then fit gaussians to the intensity curves.
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We observe that 35 mm is 244 pix by comparing with the 3.5 cm distance between diagonal bolt studs.
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[[Image:ZeroPort10MeV-0.15-leftright-slice.pdf]]
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[[Image:ZeroPort10MeV-0.15-updown-slice.pdf]]
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[[Image:ZeroPort10MeV-0.15-leftright-slice.jpg |  200 px]]
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[[Image:ZeroPort10MeV-0.15-updown-slice.jpg | 200 px]]
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<math>\sigma = \frac{w}{2} \frac{35}{244} </math> renders the standard deviation into mm. 
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The FWHM is <math> 2.35\sigma </math>.  For the slices at the 0.15 setting, the FWHM are: <math> 2.35\sigma_x = 2.5 </math>mm and <math> 2.35\sigma_y = 2.7 </math>mm.  This is fully consistent with our digital photographs taken on May 27, 2008.
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== '''90 Degree Port.''' ==
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Beam spot at the 90 Degree Port as a function of grid voltage knob setting -- not calibrated to voltage but reproducible.  (Settings: 0.61, 0.80, 1.23, 1.50)
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[[Image:90Port_10MeV_Gun2keV_Grid_0.61.JPG| 200 px]]
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[[Image:90Port_10MeV_Gun2keV_Grid_0.80.JPG| 200 px]]
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[[Image:90Port_10MeV_Gun2keV_Grid_1.23.JPG| 200 px]]
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[[Image:90Port_10MeV_Gun2keV_Grid_1.50.JPG| 200 px]]
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= Tune 4 MeV electrons into Experimental Cell=
 
= Tune 4 MeV electrons into Experimental Cell=
  
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==Tune parameters==
 
Optics elements 45Q2, Bend2, L90Q1m L90Q2 are after the tungsten converter.
 
Optics elements 45Q2, Bend2, L90Q1m L90Q2 are after the tungsten converter.
  
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|Grid|| 4.84
 
|Grid|| 4.84
 
|-
 
|-
−
|802 || 13.2 kV
+
|1202 || 13.2 kV
 
|-
 
|-
 
|SOL1 || 0.00
 
|SOL1 || 0.00
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|SOL2 || 8.59
 
|SOL2 || 8.59
 
|}
 
|}
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Here is an image of the transmission. Channel-2 minus Channel-4 (FC - flange).
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[[Image:IAC-xmission-28May08.jpg | 200 px]]
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==MPA Runs==
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 +
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The runs below had about 40 mA peak before the first 45 degree bend.
 +
 +
Na-22 beta decays giving off a 215 keV KE beta and a 1.275 MeV photon.
 +
 +
Co-60:  decays to Ni giving 2 dominant gamma lines at 1.173237( 4)  and
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1.332501( 5) MeV.  The Average Beta energy is 95 keV.
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 +
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Using runs 7 and 9 I see the following
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[[Image:NaICalib_PositronRuns13-14.gif]]
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{| border="1"  |cellpadding="20" cellspacing="0
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|-
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|Run # || MPA file name || W || Ta || Description
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|-
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|6|| NaI006.mpa || NA || NA || Background measurement, no source
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|-
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|7|| NaI007.mpa || NA || NA || Na-22 source on top of NaI detector
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|-
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|8|| NaI008.mpa || NA || NA || change spec amp gain from 500 to 200
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|-
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|9|| NaI009.mpa || NA || NA  || Co-60 source on top of NaI, Na-22 removed, Spec amp gain back to 500
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|-
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|10|| NaI010.mpa || NA || NA || change spec amp gain from 500 to 1000, put Na-22 and Co-60 on top of Nai
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|-
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|11|| NaI011.mpa || IN || IN || ADC free running, change spec amp gain to 500, took out sources
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|-
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|12|| NaI012.mpa || IN || IN || ADC gated with Gun, change spec amp gain to 500, took out sources
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|-
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|13|| NaI013.mpa || IN || IN || Start Time: 13.27, Stop Time: 14:06
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|-
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|14|| NaI014.mpa || IN || Out|| Start Time: 14:08, Stop Time: 14:37
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|-
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|15|| NaI015.mpa || IN || Out|| Install 1kG sweep magnet (electrons sweeping up or down, , Start Time: 14:49, Stop Time: 15:19
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|-
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|16|| NaI016.mpa || IN || In|| Install sweep magnet (electrons sweeping up or down, , Start Time: 15:20, Stop Time:
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|}
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=Tune for Max signal on NaI =
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{| border="1"  |cellpadding="20" cellspacing="0
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|-
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|Run # || MPA file name || W || Ta || Description
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|-
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|18|| NaI018.mpa || IN || IN ||Start Time: 16:17, Stop Time: 16:32,Change last dipole to increase count rate on NaI (before were were getting an NaI pulse for about every 30 Gun pulses)
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|-
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|19|| NaI019.mpa || IN || Out|| Start Time: 16:32, Stop Time: 16.47
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|-
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|20|| NaI020.mpa || IN || In|| Start Time: 16:49, Stop Time:  Rep rate changed from 60 to 300 Hz
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|-
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|21|| NaI021.mpa || IN || In|| Start Time: , Stop Time:  Change last dipole for electrons
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|}
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[http://www.iac.isu.edu/mediawiki/index.php/CHIPS_Run_May-2008 Go Back]

Latest revision as of 17:22, 9 July 2008

Delay from gun is about 400 ns gate width between 400 and 800 ns


Beam Scans

Zero Degree Port.

Beam spot at the Zero Degree Port as a function of grid voltage knob setting -- not calibrated to voltage but reproducible. (Settings: 0.1, 0.15, 0.18, 0.2)

ZeroPort 10MeV Gun2keV Grid 0.1.jpg ZeroPort 10MeV Gun2keV Grid 0.15.jpg ZeroPort 10MeV Gun2keV Grid 0.18.jpg ZeroPort 10MeV Gun2keV Grid 0.20.jpg



The 0.15 grid setting is nice. It does not saturate. Here we take slices in x and y and then fit gaussians to the intensity curves. We observe that 35 mm is 244 pix by comparing with the 3.5 cm distance between diagonal bolt studs.

File:ZeroPort10MeV-0.15-leftright-slice.pdf File:ZeroPort10MeV-0.15-updown-slice.pdf

ZeroPort10MeV-0.15-leftright-slice.jpg ZeroPort10MeV-0.15-updown-slice.jpg


[math]\sigma = \frac{w}{2} \frac{35}{244} [/math] renders the standard deviation into mm. The FWHM is [math] 2.35\sigma [/math]. For the slices at the 0.15 setting, the FWHM are: [math] 2.35\sigma_x = 2.5 [/math]mm and [math] 2.35\sigma_y = 2.7 [/math]mm. This is fully consistent with our digital photographs taken on May 27, 2008.

90 Degree Port.

Beam spot at the 90 Degree Port as a function of grid voltage knob setting -- not calibrated to voltage but reproducible. (Settings: 0.61, 0.80, 1.23, 1.50) 90Port 10MeV Gun2keV Grid 0.61.JPG 90Port 10MeV Gun2keV Grid 0.80.JPG 90Port 10MeV Gun2keV Grid 1.23.JPG 90Port 10MeV Gun2keV Grid 1.50.JPG


Tune 4 MeV electrons into Experimental Cell

Tune parameters

Optics elements 45Q2, Bend2, L90Q1m L90Q2 are after the tungsten converter.

Device setting
RS1 -0.46
RS2 +0.77
FS1 -0.68
FS2 0.00
0Q1 +0.76
0Q2 +0.94
45Q1 +0.02
45Q2 +1.37
L90Q1 -2.98
L90Q2 +0.98
Bend1 +1.42
Bend2 +10.66
Gun HV 20 kV
Grid 4.84
1202 13.2 kV
SOL1 0.00
SOL2 8.59


Here is an image of the transmission. Channel-2 minus Channel-4 (FC - flange).

IAC-xmission-28May08.jpg

MPA Runs

The runs below had about 40 mA peak before the first 45 degree bend.

Na-22 beta decays giving off a 215 keV KE beta and a 1.275 MeV photon.

Co-60: decays to Ni giving 2 dominant gamma lines at 1.173237( 4) and 1.332501( 5) MeV. The Average Beta energy is 95 keV.


Using runs 7 and 9 I see the following

NaICalib PositronRuns13-14.gif

Run # MPA file name W Ta Description
6 NaI006.mpa NA NA Background measurement, no source
7 NaI007.mpa NA NA Na-22 source on top of NaI detector
8 NaI008.mpa NA NA change spec amp gain from 500 to 200
9 NaI009.mpa NA NA Co-60 source on top of NaI, Na-22 removed, Spec amp gain back to 500
10 NaI010.mpa NA NA change spec amp gain from 500 to 1000, put Na-22 and Co-60 on top of Nai
11 NaI011.mpa IN IN ADC free running, change spec amp gain to 500, took out sources
12 NaI012.mpa IN IN ADC gated with Gun, change spec amp gain to 500, took out sources
13 NaI013.mpa IN IN Start Time: 13.27, Stop Time: 14:06
14 NaI014.mpa IN Out Start Time: 14:08, Stop Time: 14:37
15 NaI015.mpa IN Out Install 1kG sweep magnet (electrons sweeping up or down, , Start Time: 14:49, Stop Time: 15:19
16 NaI016.mpa IN In Install sweep magnet (electrons sweeping up or down, , Start Time: 15:20, Stop Time:

Tune for Max signal on NaI

Run # MPA file name W Ta Description
18 NaI018.mpa IN IN Start Time: 16:17, Stop Time: 16:32,Change last dipole to increase count rate on NaI (before were were getting an NaI pulse for about every 30 Gun pulses)
19 NaI019.mpa IN Out Start Time: 16:32, Stop Time: 16.47
20 NaI020.mpa IN In Start Time: 16:49, Stop Time: Rep rate changed from 60 to 300 Hz
21 NaI021.mpa IN In Start Time: , Stop Time: Change last dipole for electrons

Go Back

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