Difference between revisions of "IAC LeadFlourideCherenkovCrystalTests"
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| − | Radiation exposure tests in December for Hall A. | + | '''Radiation exposure tests in December for Hall A.''' |
We will have three days of beamtime (Dec 3-5). We will use the the 25-MeV linac to direct an electron beam upon the PbF2 crystals. The lead Flouride Crystals will be placed on a translator table so that each crystal can moved into the beam. The crystals are 30x30x185 mm^3 and are 1290g each. | We will have three days of beamtime (Dec 3-5). We will use the the 25-MeV linac to direct an electron beam upon the PbF2 crystals. The lead Flouride Crystals will be placed on a translator table so that each crystal can moved into the beam. The crystals are 30x30x185 mm^3 and are 1290g each. | ||
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We find. Time on for one second is 1^{-5}s or 1 us. and Time off is 1 - 5us = 0.999999s The average current | We find. Time on for one second is 1^{-5}s or 1 us. and Time off is 1 - 5us = 0.999999s The average current | ||
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0.999999 * 0 + 0.000001*50mA = 0.05 uA. | 0.999999 * 0 + 0.000001*50mA = 0.05 uA. | ||
Revision as of 18:46, 20 November 2007
Radiation exposure tests in December for Hall A.
We will have three days of beamtime (Dec 3-5). We will use the the 25-MeV linac to direct an electron beam upon the PbF2 crystals. The lead Flouride Crystals will be placed on a translator table so that each crystal can moved into the beam. The crystals are 30x30x185 mm^3 and are 1290g each.
We need to keep the Power below one 1 Watt onto the PbF2 crystal or 0.78 Gy/block. We can achieve this by setting the beam parameters of the 25-MeV LINAC (cf. http://www.iac.isu.edu/facilities/25MeV_hall.html).
Here we have: P = E * I [P] Watts, [E] MeV, and [I] uA
beam energy 20 MeV Rep Rate: 10 Hz I_peak: 50 mA/pulse pulse width: 0.1 us (100 ns)
We find. Time on for one second is 1^{-5}s or 1 us. and Time off is 1 - 5us = 0.999999s The average current
0.999999 * 0 + 0.000001*50mA = 0.05 uA.
P = (20 MeV) * (0.05 uA) = 1 Watt.
With the proviso, that we wish to keep the I_peak (Instantaneous Current in the pulse) well above 5 mA so the it can be tracked by the pick-up coil. 50 mA/pulse will do the job.
o Day 1: 5 hours of beamtime
1a) a first irradiation(blocks 1~4) ~5 hours Day 1 2a) do a transparency measurement (blocks 1~4) ~3 hours Day 1 3a) do a block (blocks 1~4) curing exposure to a blue light 24 hours day 1 day
o Day 2: 5 hours of beamtime
1b) a first irradiation(blocks 5~8) ~5 hours Day 2 2b) do a transparency measurement (blocks 5~8) ~3 hours Day 2 3b) do a block (blocks 5~8 curing exposure to a blue light 24 hours Day 2 and Day 3
o Day 3: 5 hours + 5 hours of beamtime.
4a) repeat a transparency measurement (blocks 1~4) ~3hours day 3 5a) do a second irradiation (blocks 1~4) ~5 hours day 3 3a) do a transparency measurement (blocks 1~4) ~3 hours day 3 4b) repeat a transparency measurement (blocks 5~8) ~3 hours day 3 5b) do a second irradiation (blocks 5~8) ~5 hours day 3 at the end of the day
Day 4 and Day 5 will be used to more curing and transparency measurements.
The specifics are listed below
RunPlan:
References:
NIM articles:
File:Achenbach NIM A416 1998 pg357.pdf
Private Communications
File:FEL IrradiationTests 8-25-07.pdf
File:TransmissionTestProcedure J.Roche 10-15-07.pdf
File:CalorimeterHeatingEquations.pdf