Difference between revisions of "Bubble Chamber Meeting Wednesday January 20, 2016"

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'''Notes from this meeting:'''
 
'''Notes from this meeting:'''
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* My previous statement [https://wiki.jlab.org/ciswiki/index.php/Bubble_Chamber_Meeting_Wednesday_November_11,_2015] about beam energy being 5% lower than set value is not correct. The quarter cryo-unit RF gradients were found to be lower by 5%. During the September test, we set the energy using the dipole so we should be very close to the quoted energy. Complete analysis of the beam energy measurements is forthcoming.
 
  
 
* In the simulation, the collimator inner radius is correct (8.0 mm).
 
* In the simulation, the collimator inner radius is correct (8.0 mm).

Latest revision as of 15:00, 24 January 2016

We will meet in TL 2221 on Wednesday January 20 at 3:30 pm EST.

For those calling in we'll use the Blue Jeans [1] audio conference system.

Phone number: 1-888-240-2560
Meeting ID: 3528502673#
Meeting URL: http://bluejeans.com/3528502673


Agenda:

1- GEANT4 Simulation:

  1. Gamma Flux: media:G4Flux_Sept2015.pdf media:G4Flux_Sept2015.pptx
  2. Expected Rates:
    1. 18O(γ,α)14C with no ThrCut: media:O18ga_rate_G4.txt
    2. 17O(γ,n)16O with:
      1. ThrCut = 90 keV: media:O17gn_rate_G4_90keV.txt
      2. ThrCut = 130 keV: media:O17gn_rate_G4_130keV.txt
    3. 14N(γ,p)13C with:
      1. ThrCut = 20 keV: media:N14gp_rate_G4_20keV.txt
      2. ThrCut = 50 keV: media:N14gp_rate_G4_50keV.txt


2- Sept beam test data analysis: media:Analyses_Rashi_Jan2016.pdf media:Analyses_Rashi_Jan2016.pptx

3- Discussion of June 2016 beam test



Notes from this meeting:

  • In the simulation, the collimator inner radius is correct (8.0 mm).
  • Bubble chamber simulation remaining tasks:
  1. Complete geometry: add stainless steel cube and flanges
  2. Add electron beam energy spread and beam size
  3. Measure fraction of photons that are absorbed in the N2O target as a function of Eγ
  • Next Bubble Chamber beam test will measure 19F(γ,α)15N
  • Old fluorine chamber has a height of 36 inches. Beamline height on the concrete platform is 27 inches. Beamline height before the platform is 42 inches.
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