View source for CHIPS IAC Run 5-28-08

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)

[[Image:ZeroPort_10MeV_Gun2keV_Grid_0.1.jpg | 200 px]]
[[Image:ZeroPort_10MeV_Gun2keV_Grid_0.15.jpg | 200 px]]
[[Image:ZeroPort_10MeV_Gun2keV_Grid_0.18.jpg | 200 px]]
[[Image:ZeroPort_10MeV_Gun2keV_Grid_0.20.jpg | 200 px]]




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.

[[Image:ZeroPort10MeV-0.15-leftright-slice.pdf]]
[[Image:ZeroPort10MeV-0.15-updown-slice.pdf]]

[[Image:ZeroPort10MeV-0.15-leftright-slice.jpg |  200 px]]
[[Image:ZeroPort10MeV-0.15-updown-slice.jpg | 200 px]]


<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)
[[Image:90Port_10MeV_Gun2keV_Grid_0.61.JPG| 200 px]]
[[Image:90Port_10MeV_Gun2keV_Grid_0.80.JPG| 200 px]]
[[Image:90Port_10MeV_Gun2keV_Grid_1.23.JPG| 200 px]]
[[Image:90Port_10MeV_Gun2keV_Grid_1.50.JPG| 200 px]]


= Tune 4 MeV electrons into Experimental Cell=

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

 {| border="1"  |cellpadding="20" cellspacing="0 
|-
|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).

[[Image:IAC-xmission-28May08.jpg | 200 px]]

==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

[[Image:NaICalib_PositronRuns13-14.gif]]

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


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

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