View source for Summary notes 4 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