Differences between revisions 2 and 3
Revision 2 as of 2008-10-31 12:12:54
Size: 142
Editor: NilsFeege
Comment:
Revision 3 as of 2008-10-31 12:37:06
Size: 1490
Editor: NilsFeege
Comment:
Deletions are marked like this. Additions are marked like this.
Line 3: Line 3:
The SiPM gain G is proportinal to the difference between applied bias voltage U,,bias,, and breakdown voltage U,,bd,,, (U,,bias,, - U,,bd,,). Since U,,bd,, is proportional to the temperature T of the device, changes of G are proportional to the negative of temperature changes. The absolute voltage and temperature dependencies of the gain of the SiPMs in the AHCAL prototype are:
Line 4: Line 5:
 * attachment:dG_dU_desy.txt (''dG/dU in ADC-ch. / V determined using measurements performed at DESY (2008)'') +
 * attachment:dG_dU_cern.txt (''dG/dU in ADC-ch. / V determined using measurements performed at CERN (2007), modules 1, 2, 14 and 25 are missing'')
 * attachment:dG_dT_fnal.txt (''dG/dT in ADC-ch. / K determined using measurements performed at FNAL (2008)'') +
 * attachment:dG_dT_cern.txt (''dG/dT in ADC-ch. / K determined using measurements performed at CERN (2007)'')

The format of the files is:
 <module> <chip> <channel> <dG/dX> <error> <status>
error is the error on dG/dX given by the ROOT fit routine. status > 0 indicates the numbers of gain measurements used for extracting the slopes, while status = 0 indicates that no data are available for the corresponding channel or that the chisquare/DOF of the corresponding fit is smaller than 10 (U dependencies) or 20 (T dependencies). The "+" marks the files with more "good" results.
Line 6: Line 15:

Voltage and Temperature Dependencies of the Gain

The SiPM gain G is proportinal to the difference between applied bias voltage Ubias and breakdown voltage Ubd, (Ubias - Ubd). Since Ubd is proportional to the temperature T of the device, changes of G are proportional to the negative of temperature changes. The absolute voltage and temperature dependencies of the gain of the SiPMs in the AHCAL prototype are:

  • attachment:dG_dU_desy.txt (dG/dU in ADC-ch. / V determined using measurements performed at DESY (2008)) +

  • attachment:dG_dU_cern.txt (dG/dU in ADC-ch. / V determined using measurements performed at CERN (2007), modules 1, 2, 14 and 25 are missing)

  • attachment:dG_dT_fnal.txt (dG/dT in ADC-ch. / K determined using measurements performed at FNAL (2008)) +

  • attachment:dG_dT_cern.txt (dG/dT in ADC-ch. / K determined using measurements performed at CERN (2007))

The format of the files is:

  • <module> <chip> <channel> <dG/dX> <error> <status>

error is the error on dG/dX given by the ROOT fit routine. status > 0 indicates the numbers of gain measurements used for extracting the slopes, while status = 0 indicates that no data are available for the corresponding channel or that the chisquare/DOF of the corresponding fit is smaller than 10 (U dependencies) or 20 (T dependencies). The "+" marks the files with more "good" results.

Voltage and Temperature Dependencies of the MIP Response

coming soon...

temperature and voltage dependencies (last edited 2009-06-16 18:32:15 by localhost)