General Meeting Summary 2/26/15

IDAHO TESTS (17 - 20 FEBRUARY)

Crystals appear to be able to handle high doses at high dose rates
Crystals properties are sensitive to temperature. In extreme cases, e.g., rise of temperature of more than 0.5 degrees/min, structural damage may occur.

Rainer's radiation method is different (e.g., particles, energy, radiation uniformity) and so a direct comparison of the two data sets may not be possible
Next step: check if can send subset of the crystals to Rainer for testing in his setup
Action items: 1) Check on shipping crystals from Idaho to JLab (Carlos), 2) Check with Rainer on possibilities to test crystals at Giessen (TH), 3) Check on shipping crystals from JLab to Giessen (Hamlet, Rolf)

Discussion of further crystal measurements and tests at JLab in parallel to tests at Giessen

Crystal recovery: depends on temperature (see slide 18 in Rainer's talk from Nov 2014 NPS collaboration meeting). For further studies of radiation hardness may need to consider a temperature stabilized system.
Crystal light yield: Light yield depends on temperature, e.g., Rainer's measurements were conducted in a temperature stabilized system at 18 degrees (see his talk from Nov 2014 NPS collaboration meeting). A temperature stabilized system could be beneficial for these tests.
Transmittance and timing

Discussion of testing PWO crystals at Idaho for selection purposes in the future

In general seems possible. Irradiation procedure for one crystal takes about 20 minutes
Temperature stabilizing system required to eliminate uncertainties in radiation hardness due to temperature dependence. Such a system would also help with increasing the dose rate without causing structural damage to the crystal.

Should still be done
Would use the same crystals that have been tested at Idaho and with Rainer's setup

ITEMS FOR NEXT MEETING:

NEXT MEETING: THUR., 19 MARCH 9:00 AM (EST)

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