Difference between revisions of "BCM calibration E06007"
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EPICS calibration from bcmlog-127 (Offsets without current in Hall from bcmlog-125) | EPICS calibration from bcmlog-127 (Offsets without current in Hall from bcmlog-125) | ||
| + | |||
| + | Note that the constants differ significantly from the ones used in the Start of Run info. The values obtained in CSR are: | ||
| + | 43.399±0.558 and 42.913±0.358, which are similar (within error bars) to the ones obtained here. | ||
| + | |||
{| border="1" | {| border="1" | ||
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!Constant (I>5uA) || 43.25 +/- 0.02 || 42.60 +/- 0.02 | !Constant (I>5uA) || 43.25 +/- 0.02 || 42.60 +/- 0.02 | ||
|- | |- | ||
| + | ! Constant in Start of Run || 45.218 || 45.532 | ||
|} | |} | ||
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http://hallaweb.jlab.org/experiment/E97-110/tech/bcm_info.pdf | http://hallaweb.jlab.org/experiment/E97-110/tech/bcm_info.pdf | ||
| − | BCM Epics variables | + | [[BCM Epics variables]] |
| − | + | # BCMs | |
epicslist2="hac_bcm_average hac_bcm_dvm1_read hac_bcm_dvm2_read hac_bcm_dvm1_current hac_bcm_dvm2_current hac_unser_current IPM2C24A.IENG IBC0R07CRCUR1 IBC1H04CRCUR2 FCupsCORRECTED.VAL EHAR_LIXWidth EHAR_LIYWidth EHAR_ENABLE EHAR_IXPEAK EHAR_IYPEAK" | epicslist2="hac_bcm_average hac_bcm_dvm1_read hac_bcm_dvm2_read hac_bcm_dvm1_current hac_bcm_dvm2_current hac_unser_current IPM2C24A.IENG IBC0R07CRCUR1 IBC1H04CRCUR2 FCupsCORRECTED.VAL EHAR_LIXWidth EHAR_LIYWidth EHAR_ENABLE EHAR_IXPEAK EHAR_IYPEAK" | ||
| + | |||
| + | hac_bcm_average = 0.5*(hac_bcm_dvm1_current + hac_bcm_dvm2_current) | ||
| + | |||
| + | hac_bcm_dvm1_current = (hac_bcm_dvm1_read - offset)*Calibration_constant | ||
Revision as of 14:51, 4 February 2010
Wiki Entry
https://hallaweb.jlab.org/wiki/index.php/BCM_calibration_E04-018
PVDIS entry
http://hallaweb.jlab.org/experiment/E08-011/documents/bcm/AboutBCMcalibrations.html
BCM LOGS
http://hallaweb.jlab.org/experiment/E08-011/documents/bcm/bcmLogs
Previous SCALERS CALIBRATION used in end of run information
http://www.jlab.org/~adaq/halog/html/0705_archive/070530235058.html
I-scan runs in E06007 http://spreadsheets.google.com/ccc?key=0AomwfAy24yA3dEpFQ3k0QnhUQzJ2VEFKei0xaVdIY1E&hl=en
| Carbon (1179-1183) | Pb (1184-1188) | Bi (1349-1354) | ||||
|---|---|---|---|---|---|---|
| I (µA) | T1 / T3 (Hz) | I (µA) | T1 / T3 (Hz) | I (µA) | T1 / T3 (Hz) | |
| 5.3 | 256 / 243 | 4.9 | 1.64k / 605 | 1.0 | 192 / 202 | |
| 10 | 443 / 414 | 9.1 | 3.11k / 1.14k | 2.1 | 420 / 420 | |
| 21 | 884 / 826 | 19.5 | 6.64k / 2.43k | 5 | 1.1k / 1.0k | |
| 40 | 1.77k / 1.65k | 39.2 | 13.4k / 4.91k | 10 | 2.0k / 2.0k | |
| 53 | 2.24k / 2.08k | 42.8 | 14.7k / 5.40k | 25 | 4.9k / 4.0k | |
| 40 | 8.0k / 7.2k |
Steps for BCM calibration
The Run faraday cup vs I0L02 is in [BcmLog125]
Faraday vs Injector current - From BCMLOg-125 - 20Feb07
Faraday_Current = (0.28+-0.03) + (0.994+-0.001) * IBC0L02_Current
Faraday / Injector = 1.0027 +- 0.0006 , for Current >5uA
| Ratio Faraday vs I0L02 (All range) | Ratio Faraday vs I0L02 (Current > 5uA) | |
|---|---|---|
 |
 |
Check of the Average Beam Current used in E06007 -- Only initial optics calibration runs used low currents -
A complete list of run information can be found in the link in the initial page: https://hallaweb.jlab.org/wiki/index.php/E06-007
EPICS calibration from bcmlog-127 (Offsets without current in Hall from bcmlog-125)
Note that the constants differ significantly from the ones used in the Start of Run info. The values obtained in CSR are: 43.399±0.558 and 42.913±0.358, which are similar (within error bars) to the ones obtained here.
| Upstream | Downstream | |
|---|---|---|
| Offset | 0.0009191 +/- 1e-07 | 0.00028730 +/- 5e-08 |
| Constant | 43.16 +/- 0.05 | 42.45 +/- 0.06 |
| Constant (I>5uA) | 43.25 +/- 0.02 | 42.60 +/- 0.02 |
| Constant in Start of Run | 45.218 | 45.532 |
Production Runs without Current in Hall C --> Run 1326 (Bi,85uA) , Run 1327 (Bi, 24uA)
Sample of Cosmics Runs for Scalers Offset along the experiment--> Run 1042, 1252, 1335, 1488, 1752, 2006
They can be used to check offset variations as showed in Vince's Tech note.
http://hallaweb.jlab.org/experiment/E97-110/tech/bcm_info.pdf
- BCMs
epicslist2="hac_bcm_average hac_bcm_dvm1_read hac_bcm_dvm2_read hac_bcm_dvm1_current hac_bcm_dvm2_current hac_unser_current IPM2C24A.IENG IBC0R07CRCUR1 IBC1H04CRCUR2 FCupsCORRECTED.VAL EHAR_LIXWidth EHAR_LIYWidth EHAR_ENABLE EHAR_IXPEAK EHAR_IYPEAK"
hac_bcm_average = 0.5*(hac_bcm_dvm1_current + hac_bcm_dvm2_current)
hac_bcm_dvm1_current = (hac_bcm_dvm1_read - offset)*Calibration_constant
