1,870
edits
Changes
Jump to navigation
Jump to search
Line 18:
Line 18: + − + − ## periodically acquire an ensemble of pulses in the dark to determine gain, and dark rate+ − + − + − + − ## periodically acquire an ensemble of pulses in the with a pulser to determine gain, and photo-detection efficiency − # Repetition of 1. and 2. as desired to determine if complete healing is possible at these doses − + − + + + + + Line 34:
Line 37: +
SiPM Radiation Hardness Tests (view source)
Revision as of 16:48, 23 August 2010
, 16:48, 23 August 2010→Proposed Measurement Program
=== Proposed Measurement Program ===
=== Proposed Measurement Program ===
The following procedure uses as a unit of radiation dose the '''rem''' based on the neutron dosimeter used in [http://www.jlab.org/Hall-D/software/wiki/index.php?title=SiPM_Radiation_Hardness_Test&redirect=no the study by Y. Qiang et.al. referenced above].
# Irradiation with about 40 rem over the course of a few days (source strength selected appropriately)
# Irradiation with monitoring until the dark rate in the SiPM has increased by a factor 2 over the initial conditions, then allow the SiPM to self-anneal and monitor its recovery.
# Monitoring will consist of ''full measurements'' (see below) taken at several points during irradiation, and periodically during annealing.
## periodically acquire an ensemble of pulses in the with a pulser to determine gain, and photo-detection efficiency
# The initial period between measurements while irradiating should be 1 rem, to be adjusted after a trend is observed.
# Relaxation time of duration determined by the apparent healing rate.
# The initial period between measurements while annealing should be one day, to be adjusted after a relaxation time is observed.
## periodically acquire an ensemble of pulses in the dark to determine gain, and dark rate
# Once the data up to factor-2 dark rate increase and subsequent annealing have been analyzed, proceed with a longer irradiation period until significant curvature is seen in the dark rate vs. dose curve. then repeat the annealing measurements to compare with the initial relaxation rates.
# Irradiate the unit for a much longer duration - until some saturation of the performance parameters is seen. This will help determine the offset in the model of the deterioration of performance parameters.
# Irradiate the unit for a much longer duration - until some saturation of the performance parameters is seen. This will help determine the offset in the model of the deterioration of performance parameters.
## periodically acquire an ensemble of pulses in the dark to determine gain, and dark rate
## periodically acquire an ensemble of pulses in the with a pulser to determine gain, and photo-detection efficiency
"Full measurement" above refers to the following:
# collection of an ensemble of pulse integrals in the dark to determine the dark rate and gain
# collection of an ensemble of pulse integrals with a pulser at low setting to determine gain, and photo-detection efficiency
Performing (2) at low enough pulser settings to count photons allows a check of the gain against the result in the dark count analysis. In the worst case, higher intensity light pulses may be used: the efficiency is then determined using the gain determined in (1).
== Links ==
== Links ==
* [[Characterizing SiPMs]]
* [[Characterizing SiPMs]]
* [http://www.photonique.ch Photonique SA] SiPM Specification Sheets: SSPM-05~ [http://www.photonique.ch/DataSheets/SSPM_050701GR_TO18.pdf] and SSPM-06~ [http://www.photonique.ch/DataSheets/SSPM_0606BG4MM.pdf]
* [http://www.photonique.ch Photonique SA] SiPM Specification Sheets: SSPM-05~ [http://www.photonique.ch/DataSheets/SSPM_050701GR_TO18.pdf] and SSPM-06~ [http://www.photonique.ch/DataSheets/SSPM_0606BG4MM.pdf]
* JLab [http://www.jlab.org/Hall-D/software/wiki/index.php?title=SiPM_Radiation_Hardness_Test&redirect=no SiPM Radiation Hardness Test]