Difference between revisions of "Summary notes 4 February 2020"

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(Created page with "CPS CONCEPT (Bogdan) * Magnet ::* Yoke ::* Radiation hard coil * Inside the magnet: Copper absorber and W-Cu inserts * Segmented radiation shield ::* Tungsten powder, perha...")
 
 
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CPS CONCEPT (Bogdan)
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'''CPS CONCEPT''' (Bogdan)
  
 
* Magnet
 
* Magnet
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::* distribute load over target aread - two concepts: rotate target, vertical oscillation magnet
 
::* distribute load over target aread - two concepts: rotate target, vertical oscillation magnet
  
RADIATION SIMULATION (Gabriel)
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'''RADIATION SIMULATION''' (Gabriel)
  
 
* Software tools:
 
* Software tools:
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::::* Forward region is not dominated by CPS, but by the intensity of target/beamline
 
::::* Forward region is not dominated by CPS, but by the intensity of target/beamline
  
BEAM BACKGROUND SIMULATIONS (Lorenzo)
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'''BEAM BACKGROUND SIMULATIONS''' (Lorenzo)
  
 
* Simulations getting more reliable and validating results against data (nuclear target data, Hall B)
 
* Simulations getting more reliable and validating results against data (nuclear target data, Hall B)
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::* Discussion about publishing the results from RadCon group
 
::* Discussion about publishing the results from RadCon group
  
CPS4KLF and KL EXPERIMENT (Sean)
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'''CPS4KLF and KL EXPERIMENT''' (Sean)
  
 
* Presentation of the general requirements for a CPS in Hall D
 
* Presentation of the general requirements for a CPS in Hall D
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TIMELIKE COMPTON SCATTERING (Marie, Vardan)
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'''TIMELIKE COMPTON SCATTERING''' (Marie, Vardan)
  
 
* Presentation of the theory and work to address PAC report
 
* Presentation of the theory and work to address PAC report
  
 
* Presentation of simulations to demonstrate the feasibility of the experiment
 
* Presentation of simulations to demonstrate the feasibility of the experiment

Latest revision as of 17:58, 7 February 2020

CPS CONCEPT (Bogdan)

  • Magnet
  • Yoke
  • Radiation hard coil
  • Inside the magnet: Copper absorber and W-Cu inserts
  • Segmented radiation shield
  • Tungsten powder, perhaps lead
  • Photon beam physics - requires 2mm diameter photon beam to allow for accurate reconstruction of the exclusive process
  • Compact beam dump:
  • shielding - 20 interaction lengths
  • absorb beam power - raster the beam
  • distribute load over target aread - two concepts: rotate target, vertical oscillation magnet

RADIATION SIMULATION (Gabriel)

  • Software tools:
  • OPERA - magnet
  • GEANT4 - photon beam profile
  • FLUKA - activation (Note: Fortran based software)
  • ROOT, PYTHON
  • Full CPS+target field model has been implemented and background radiation simulations were carried out
  • W powder is most effective for all shielding - for activation in backward direction lead may be preferable
  • Overall radiation level seems comparable to PREX-II (~60 rem/hr at 2m from beamline near exit)
  • Note: < 1 rem/hr is the requirement for people to work
  • CPS studies suggest that this is fulfilled in the backward and target region
  • Forward region is not dominated by CPS, but by the intensity of target/beamline

BEAM BACKGROUND SIMULATIONS (Lorenzo)

  • Simulations getting more reliable and validating results against data (nuclear target data, Hall B)
  • Geant4 had bugs in D2 (fixed), still present for He3 and tritium
  • Discussion about possible "freezing" a JLab Geant4 version
  • Discussion about publishing the results from RadCon group

CPS4KLF and KL EXPERIMENT (Sean)

  • Presentation of the general requirements for a CPS in Hall D
  • 60 kW (12 GeV electrons at 5 uA_, 64ns bunch spacing, beam size ~500um (c.f. Hall A/C: ~100uA)
  • Target: Be - distance CPS to Be target is 55 meters
  • Keep similar inner design with main items to optimize:
  • Weight - should be < 100 tons (size and composition)
  • Collimation/exit for beam properties (electron beam raster)
  • radiation level requirements in Hall D can be higher than Hall A/C (there protect the polarized target), so can make the forward piece shorter
  • Note that there is permanent magnet in the beam line that requires moving the CPS from where it was shown
  • Double raster to focus on target - need this raster since travel over long distance and cannot afford up/down movement (must compensate) as in Hall A/C
  • where should the raster be located? - In Hall A/C it is ~2-5 meters from the target
  • Presentation of the To-Do list towards a fully approved proposal


TIMELIKE COMPTON SCATTERING (Marie, Vardan)

  • Presentation of the theory and work to address PAC report
  • Presentation of simulations to demonstrate the feasibility of the experiment