CURRENT VALUES - Ideal flight mode
ideal Ideal mode calibrations are based on measured means of Cal cal Flight Models.
They are not well suited to real data as they treat all crystals as equal, while the varying pedestals in real
data could cause some ideal calibrations to be out of range.
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- HE gain setting is set to maximum energy range, raising single xtal saturation level.
- ULD values for all ranges and HEX1 saturation level are set to very close to 4095. The previous values were lower in an effort to avoid problems caused by channels w/ higher pedestals which is not an issue in ideal mode
- LAC threshold was raised to 1.3 MeV which is closer to the mean LAC threshold used for flight crystals
- pedestal noise levels are lower to better reflect the true behavior of the flight front-ends
- some values were rounded a bit just to make things simpler.
CURRENT VALUES - Ideal muon mode
ideal mode calibrations are based on measured means calibrations of real Cal flight models.
They are not well suited to real data as they treat all crystals as equal, using them w/ the varying pedestals in real
data could cause some calculations to go out of range.
'muon' mode calibrations are simply average values from ground muon collections.
The effective reponse of the current configuration is as follows
NEWIDEAL_MUON2 ( CalXtalReponse v0r2p6, GlastRelease v6r4 -> v6r5)
RANGE MeV/ADC MAX_ADC SATURATION(MEV) PED(ADC) NOISE(ADC,MeV) LAC(ADC,MeV)
LEX8 0.03 3550 106.5 510 6.0, 0.18 43, 1.29
LEX1 0.27 3850 958.5 210 0.6, 0.162
HEX8 0.17 3550 569.5 510 6.0, 1.02
HEX1 1.53 3850 5890 210 0.6, 0.92
it incoperates the following improvements over the prievous version.
- ULD values for all ranges and HEX1 saturation level are set to very close to 4095. The previous values were lower in an effort to avoid problems caused by channels w/ higher pedestals which is not an issue in ideal mode
- LAC threshold was raised to 1.3 MeV which is closer to the mean LAC threshold used for flight crystals
- pedestal noise levels are lower to better reflect the true behavior of the flight front-ends
- some values were rounded a bit just to make things simpler.
HISTORY OF VALUES
This documents the history of CalXtalReponse ideal calibration effective gain & noise for versions <= v0r3 at which point documentation will be included in the header of each xml file.
| No Format |
|---|
NEWIDEAL_FLIGHT (CalXtalReponse v0r2p8 -> v0r2p7, GlastRelease v6r6 -> v6r6p1) RANGE MeV/ADC MAX_ADC SATURATION(MEV) PED(ADC) NOISE(ADC,MeV) LAC(ADC,MeV) LEX8 0.03 3400 109 510 5.1, 0.153 30, 0.9 LEX1 0.27 3400 941 210 2.1, 0.567 HEX8 1.73 3400 5913 510 5.1, 8.823 HEX1 15.38 3400 52,000 210 2.1, 32.30 NEWIDEAL_MUON2 ( CalXtalReponse v0r2p6, GlastRelease v6r4 -> v6r5) RANGE MeV/ADC MAX_ADC SATURATION(MEV) PED(ADC) NOISE(ADC,MeV) LAC(ADC,MeV) LEX8 0.03 3400 109 510 5.1, 0.153 30, 0.9 LEX1 0.27 3400 941 210 2.1, 0.567 HEX8 0.17 3400 591 510 5.1, 0.867 HEX1 1.53 3400 5,200 210 2.1, 3.213 NEWIDEAL_MUON1 ( CalXtalReponse v0r2 -> v0r2p5, GlastRelease <= v6r3p2 ) RANGE MeV/ADC MAX_ADC SATURATION(MEV) PED(ADC) NOISE(ADC,MeV) LAC(ADC,MeV) LEX8 0.03 3500 112 510 5.1, 0.153 30, 0.9 LEX1 0.27 3500 968 210 2.1, 0.567 HEX8 0.17 3500 608 510 5.1, 0.867 HEX1 1.53 3500 5,352 210 2.1, 3.213 |
HOW IT WORKS
basically, there are two stages.
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