Note: 'official' status and values can always be found here http://www-glast.stanford.edu/cgi-bin/viewcvs/CalXtalResponse/xml/
CURRENT VALUES - Ideal flight mode
Ideal mode calibrations are based on measured means of 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.
'flight' mode calibrations are intended for simulating flight energy levels.
The effective reponse of the current configuration is as follows
No Format |
---|
NEWIDEAL_FLIGHT3 (CalXtalResponse v0r6p6, 7/21/05 expected GlastRelease > v6r9)
- NOTE: all ADC units are pedestal subtracted
RANGE MeV/ADC MAX_ADC SATURATION(MEV) PED(ADC) NOISE(ADC,MeV) LAC(ADC,MeV) FLE(ADC,MeV) FHE(ADC,MeV)
LEX8 0.03 3550 109 510 13.3, 0.4 66.6, 2.0 3333,100
LEX1 0.27 3850 941 210 1.48, 0.4
HEX8 2.16 3550 7676 510 6.0, 12.96 463,1000
HEX1 19.23 3850 74,016 210 0.6, 11.5
|
it incoperates the following improvements over the prievous version.
- increase of noise & LAC thresholds to better approximate real flight expectations
- enabling of FLE & FHE trigger simulation
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
No Format |
---|
NEWIDEAL_MUON2 ( CalXtalReponse v0r2p6, GlastRelease v6r4 -> v6r9 ....current)
- NOTE: all ADC units are pedestal subtracted
- NOTE: FLE & FHE values added in CalXtalResponse v0r6p6
RANGE MeV/ADC MAX_ADC SATURATION(MEV) PED(ADC) NOISE(ADC,MeV) LAC(ADC,MeV) FLE(ADC,MeV) FHE(ADC,MeV)
LEX8 0.03 3550 106.5 510 6.0, 0.18 43, 1.29 333,10
LEX1 0.27 3850 958.5 210 0.6, 0.162
HEX8 0.17 3550 569.5 510 6.0, 1.02 176,30
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 calibrations.
No Format |
---|
NEWIDEAL_FLIGHT2 (CalXtalResponse v0r3p1 -> v0r6p5, GlastRelease v6r6p0416 -> v6p9)
- NOTE: all ADC units are pedestal subtracted
RANGE MeV/ADC MAX_ADC SATURATION(MEV) PED(ADC) NOISE(ADC,MeV) LAC(ADC,MeV)
LEX8 0.03 3550 109 510 6.0, 0.18 43, 1.29
LEX1 0.27 3850 941 210 0.6, 0.162
HEX8 2.16 3550 7676 510 6.0, 12.96
HEX1 19.23 3850 74,016 210 0.6, 11.52
it incoperates the following improvements over the prievous version.
- 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.
Note: CalXtalResponse v0r3 was incorrect
NEWIDEAL_FLIGHT (CalXtalReponse v0r2p8 -> v0r2p7, GlastRelease v6r6 -> v6r6p1)
- NOTE: all ADC units are pedestal subtracted
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)
- NOTE: all ADC units are pedestal subtracted
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 )
- NOTE: all ADC units are pedestal subtracted
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.
...
digi is the opposite of course, but it is done in peicespieces. first the dac 'scale' values for the individual McIntegratingHit energies are summed together, once they're all summed, then we convert dac->adc.
...