PePPO 05302012: Difference between revisions
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Created page with '=Runlist= {| border="1" |cellpadding="20" cellspacing="0 |- | || Signal channel || HV dac || HV (V) || readback |- | Run No. || Run Time (s) || e- Current (n…' |
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=Data Analysis= | =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 | |||
{| border="1" |cellpadding="20" cellspacing="0 | |||
|- | |||
| 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 : | |||
<pre> | |||
slope=50.1811 +/- 2.10455 | |||
y-intercept=41498.3 +/- 1894.94 | |||
coerrelation coefficient=0.998246 | |||
</pre> | |||
For A3: | |||
<pre> | |||
slope=25.3515 +/- 0.488128 | |||
y-intercept=42052.6 +/- 439.513 | |||
coerrelation coefficient=0.999628 | |||
</pre> | |||
A fit biased by including three 1 MeV lines is | |||
;For A1 | |||
<pre> | |||
slope=45.8536 +/- 0.50289 | |||
y-intercept=46253.9 +/- 522.854 | |||
coerrelation coefficient=0.999941 | |||
</pre> | |||
;For A3 | |||
<pre> | |||
slope=24.3591 +/- 0.219479 | |||
y-intercept=43143.2 +/- 228.192 | |||
coerrelation coefficient=0.999961 | |||
</pre> | |||
==Target IN/OUT== | ==Target IN/OUT== | ||
Revision as of 03:52, 12 June 2012
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
File:R5767TarIn r5768TarOut.png
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
File:R5774WTar1mm r5775WTar0p1mm A1Compare.png
Run 5776 & 5779
Calibration: 60 Ch/keV
File:R5776WTar1mm r5779WTar0p5mm A1Compare.png
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