Difference between revisions of "Meeting 1/27/22 - COMTRA"

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(Created page with "==Eric's update cyrstals== - I am in contact with the Alpha-Spectra company which was providing BGO crystals for a local project we had in Orsay. This is a US company which...")
 
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==Eric's update cyrstals==
 
==Eric's update cyrstals==
- I am in contact with the Alpha-Spectra company which was providing BGO crystals for a local project we had in Orsay.
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- I am in contact with the Alpha-Spectra company which was providing BGO crystals for a local project we had in Orsay. This is a US company which provides crystals with a guaranteed 8-9% resolution. At the time we were investigating for an order they were less expensive than Saint-Gobain and turned-out to be more performant (we performed dedicated measurements to test this).
  This is a US company which provides crystals with a guaranteed 8-9% resolution. At the time we were investigating for
+
  an order they were less expensive than Saint-Gobain and turned-out to be more performant (we performed dedicated
+
  measurements to test this).
+
  
- They should be back to me shortly with information about availability of improved radiation hardness crystals as well  
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- They should be back to me shortly with information about availability of improved radiation hardness crystals as well as radiation limits of the crystals they are currently providing.
  as radiation limits of the crystals they are currently providing.
+
  
- It should be noted that litterature about radiation aging of BGO crystals indicates that after a rapid loss of about 20%  
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- It should be noted that litterature about radiation aging of BGO crystals indicates that after a rapid loss of about 20% of transmission, the performance is kind of stable. Some experiments chose to first irradiate crystals to operate in  that regime.
  of transmission, the performance is kind of stable. Some experiments chose to first irradiate crystals to operate in  that  
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  regime.
+
  
- we may need tools to control the overall stability of the experimental signal... dedicated cosmic ray calibration run or  
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- we may need tools to control the overall stability of the experimental signal... dedicated cosmic ray calibration run or light illumination... too early stage to provide a direction of answer, but this should be kept in mind.
  light illumination... too early stage to provide a direction of answer, but this should be kept in mind.
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Revision as of 06:17, 27 January 2022

Eric's update cyrstals

- I am in contact with the Alpha-Spectra company which was providing BGO crystals for a local project we had in Orsay. This is a US company which provides crystals with a guaranteed 8-9% resolution. At the time we were investigating for an order they were less expensive than Saint-Gobain and turned-out to be more performant (we performed dedicated measurements to test this).

- They should be back to me shortly with information about availability of improved radiation hardness crystals as well as radiation limits of the crystals they are currently providing.

- It should be noted that litterature about radiation aging of BGO crystals indicates that after a rapid loss of about 20% of transmission, the performance is kind of stable. Some experiments chose to first irradiate crystals to operate in that regime.

- we may need tools to control the overall stability of the experimental signal... dedicated cosmic ray calibration run or light illumination... too early stage to provide a direction of answer, but this should be kept in mind.