Revision as of 00:38, 22 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 [math]\mbox{mm}^3[/math] and are 1290g each.

We need to keep the Power below 1 Watt onto the PbF2 crystal or 0.78 Gy/s for a [math]PbF_2[/math] block of 1.3 kg. 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] [math]\mu[/math]A

;Accelerator Setting

} Time on for one second is 1 us. and Time off is 0.999999 s 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 need 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. Crew: Pierre Bertin, Tony Forest, Adrianne Spilker, Amine Mestari, Syed Naeem, and Phil Cole Status of Setup. Translator Table (3 degrees of freedom). Setup Done. Amine and Adrianne DAQ/Readout Faraday Cups Setup DAQ/Readout Pickup Coil Setup DAQ/Readout Lead Shielding Day 0 will be for final setup. Pierre, Tony, and Adrianne. Day 4 and Day 5 will be used to more curing and transparency measurements. The specifics are listed below