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)
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
renders the standard deviation into mm.
The FWHM is . For the slices at the 0.15 setting, the FWHM are: mm and 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)
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).
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
| 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 |