Difference between revisions of "IAC LeadFlourideCherenkovCrystalTests"

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=Radiation exposure tests in December for Hall A.=
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=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 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).   
+
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 * I  [P] Watts, [E] MeV, and [I] <math>\mu</math>A
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Here we have:  ''P = E <math>\times</math> I''   [''P''] Watts, [''E''] MeV, and [''I''] <math>\mu</math>A
  
 
;Accelerator Settings
 
;Accelerator Settings
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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 [math]\mbox{mm}^3[/math] and are 1290g each.


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 [math]\times[/math] I [P] Watts, [E] MeV, and [I] [math]\mu[/math]A

Accelerator Settings
beam energy 20 MeV
Rep Rate: 10 Hz
I_peak: 50 mA/pulse
pulse width: 0.1 [math]\mu[/math]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 [math]\mu[/math]A.

P = (20 MeV) [math]\times[/math] (0.05 [math]\mu[/math]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:

PbFl_RadTests-12-3-07

PbFl_RadTests-12-4-07

PbFl_RadTests-12-5-07


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