Difference between revisions of "IAC LeadFlourideCherenkovCrystalTests"
| Line 1: | Line 1: | ||
| − | =Radiation | + | =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 individually into the beam. The crystals are 30x30x185 <math>\mbox{mm}^3</math> 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 individually 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 | + | We need to keep the Power below 1 Watt onto the <math>\mbox{PbF}_2</math>crystal or 0.78 Gy/s for a <math>\mbox{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 | + | Here we have: ''P = E <math>\times</math> I'' [''P''] Watts, [''E''] MeV, and [''I''] <math>\mu</math>A |
;Accelerator Settings | ;Accelerator Settings | ||
| Line 23: | Line 23: | ||
0.05 <math>\mu</math>A. | 0.05 <math>\mu</math>A. | ||
| − | P = (20 MeV) <math>\times</math> (0.05 <math>\mu</math>A) = 1 Watt. | + | ''P'' = (20 MeV) <math>\times</math> (0.05 <math>\mu</math>A) = 1 Watt. |
Revision as of 18:45, 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 individually into the beam. The crystals are 30x30x185 and are 1290g each.
We need to keep the Power below 1 Watt onto the crystal or 0.78 Gy/s for a 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] A
- Accelerator Settings
| beam energy | 20 MeV |
| Rep Rate: | 10 Hz |
| I_peak: | 50 mA/pulse |
| pulse width: | 0.1 s (100 ns) |
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 A.
P = (20 MeV) (0.05 A) = 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
RunPlan:
References:
NIM articles:
File:Achenbach NIM A416 1998 pg357.pdf
File:Achenbach NIM A465 2001 pg318.pdf
Private Communications
File:FEL IrradiationTests 8-25-07.pdf
File:TransmissionTestProcedure J.Roche 10-15-07.pdf
File:CalorimeterHeatingEquations.pdf