PePPO 05302012
Runlist
| Signal channel | HV dac | HV (V) | readback | |||
| Run No. | Run Time (s) | e- Current (nA) | Converter Target | Mode | DAQ Rate (Hz) | Chromox Target Position |
| 5767 | 1566 | 1 | 1 mm thick W | positron | In | |
| 5768 | 1763 | 1 | 1 mm thick W | positron | Out | |
| 5774 | 1 | 1 mm thick W | positron | 75 | IN | |
| 5775 | 1 | 0.1 mm thick W | positron | 75 | IN | |
| 5776 | 1408 | 0.5 | 1 mm thick W | positron | 75 | In |
| 5778 | 858 | 0.5 | 1 mm thick W | positron | 50 | Out |
| 5779 | 1338 | 0.5 | 0.5 mm thick W | positron | 50 | In |
Data Analysis
Calibration
https://positron.jlab.org/wiki/index.php/05232012_AnnihCntr_Calibration#Results
The calibration constants appear to have changed from
511/22230 for Annihlation Detector A1 to 511/29588 (ped subtracted)
511/18192 for Annihlation Detector A3 to 511/13706 (ped subtracted)
Fits to the peaks in run 5440 and 5441 gave the following results
| Energy | A1 Channel | A3 Channel |
| 0 | 40002 | 41709.5 |
| 511 | 69655.5 | 55603.8 |
| 1170 | 100127 | 71544.4 |
| 1270 | 104293 | 74165.3 |
| 1330 | 106243 | 75307.7 |
The high energy points overweight the linear fit for that energy region so I removed the 1179 and 1270 line from the fit.
For A1 :
slope=50.1811 +/- 2.10455 y-intercept=41498.3 +/- 1894.94 coerrelation coefficient=0.998246
For A3:
slope=25.3515 +/- 0.488128 y-intercept=42052.6 +/- 439.513 coerrelation coefficient=0.999628
A fit biased by including three 1 MeV lines is
- For A1
slope=45.8536 +/- 0.50289 y-intercept=46253.9 +/- 522.854 coerrelation coefficient=0.999941
- For A3
slope=24.3591 +/- 0.219479 y-intercept=43143.2 +/- 228.192 coerrelation coefficient=0.999961
Target IN/OUT
Run 5767 & 5768
Run 5776 & 5778
- Tight TDC cits TDC_A1-TDC_A3 < 5 nsec
Rates-vs- Converter thickness
| Run No. | Run Time (s) | e- Current (nA) | Converter Target | Mode | Chromox Target Position |
| 5774 | 489 | 1 | 1 mm thick W | positron | IN |
| 5775 | 347 | 1 | 0.1 mm thick W | positron | IN |
| 5776 | 1408 | 0.5 | 1 mm thick W | positron | In |
| 5779 | 1338 | 0.5 | 0.5 mm thick W | positron | In |
Run 5774 & 5775
Calibration: 60 Ch/keV
Run 5776 & 5779
Calibration: 60 Ch/keV
[
Run Conditions
5775
Run_type=Annihilation
DAQ_type=Sample
target_type=0.1 mm Tungsten
beam_p0=7.9
beam_current=0.001
spect_p=4.0
HWP_type=IN
jaw_jawL=13
jaw_jawR=-1 spect_current=160
mag_current=+60A
comment_text=Annihilation test in positron mode Thr =30mV AND, 1 nA, Chomox target in
CODA Config : Annih_Sample
Run Number : 5775
5774
Run_type=Annihilation
DAQ_type=Sample
target_type=1 mm Tungsten
beam_p0=7.9
beam_current=0.001
spect_p=4.0
HWP_type=IN
jaw_jawL=13
jaw_jawR=-1
spect_current=160
mag_current=+60A
comment_text=Annihilation test in positron mode Thr =30mV AND, 1 nA, Chomox target in
CODA Config : Annih_Sample
Run Number : 5774
5776
Run_type=Annihilation
DAQ_type=Sample
target_type=1 mm Tungsten
beam_p0=7.9
beam_current=0.0005
spect_p=4.0
HWP_type=IN
jaw_jawL=13
jaw_jawR=-1
spect_current=160
mag_current=+60A
comment_text=Annihilation test in positron mode Thr =30mV AND, 0.05 nA, Chomox target in
CODA Config : Annih_Sample
Run Number : 5776
5779
Run_type=Annihilation
DAQ_type=Sample
target_type=0.5 mm Tungsten
beam_p0=7.9
beam_current=0.0005
spect_p=4.0
HWP_type=IN
jaw_jawL=13
jaw_jawR=-1
spect_current=160
mag_current=+60A
comment_text=Annihilation test in positron mode Thr =30mV AND, 0.05 nA, Chomox target out
CODA Config : Annih_Sample
Run Number : 5779