[Halld-tagger] Photonique SiPM radiation test plan

[Richard Jones]

  Yi,

You may be right that 1 rem is not very much, but that is the interval we would like to start off with.  I cannot demand things that you do not wish to do, but we do ask that until we have data in-hand and have a chance to analyze it, DO NOT give this SiPM more than 10 rems (uncorrected units).  Do we agree on this?

If you could provide us with 3-5 measurements in the interval 1-10 rems, with one at the beginning and another at the end, we would greatly appreciate it.

-Richard J.


On 8/23/2010 1:30 PM, Yi Qiang wrote:
> Hi Richard and Igor,
>
> Without attaching the DAQ together to the device during the irradiation, it's not very realistic to take measurements every 1 rem ( every other hours assuming 0.5 rem/H). My experience with Hamatasu and SensL units tells us that the increase of the radiation damage can be well fitted by a second order polynomial up to 100 rem. So I suggest that we make the gap larger. Here I have a preliminary 48 hour schedule:
> day 1: 9:00 am, initial test, start of irradiation
> day 1: 4:00 pm, second test with 3.5 rem
> day 2: 9:00 am, 3rd test with 12 rem
> day 2: 4:00 pm, 4th test with 15.5 rem
> day 3: 9:00 am, 5th test with 24 rem, end of irradiation
> Then we will have 5 data point to get reasonable damage trend. The increase of the dark rate will be about factor of 4 if similar to Hamamatsu units (or 2 if similar to SensL units).
> What do you think?
>
> Cheers,
> Yi
> ------------------------------------------------------------
> Yi Qiang      Thomas Jefferson National Accelerator Facility
> Staff Scientist                12000 Jefferson Lab 12_3/F351
> yqiang at jlab.org                        Newport News, VA 23606
> Phone:(757)269-7237                        Fax:(757)269-6331
> http://www.jlab.org/~yqiang/web
> ------------------------------------------------------------
>
> On 8/23/2010 12:53 PM, Richard Jones wrote:
>>  Yi,
>>
>> Please follow the link under Notes on today's meeting agenda page (linked below) to the page containing our proposed run plan for measuring radiation damage in our SiPM.
>>
>> http://www.jlab.org/Hall-D/software/wiki/index.php/BLTWG_Meeting_08/25/2010
>>
>> Please follow up with any questions or problems with this plan.  Note in particular that we would like to see initial measurements taken every 1 rem of dose, until you have determined the sensitivity of the device.  Continue this until the dark rate has increased by a factor 2, then stop and leave it for days (weeks) to watch the device recover.  Once we see these data, we will review what should be done next with you.
>>
>> -Richard J.
>>
>>
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