Bubble Chamber Planning Meeting

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Presentation transcript:

Bubble Chamber Planning Meeting 24 July 2013

Agenda Schedule Design of beamline, radiator and dump Bubble Chamber work at Argonne Simulation and Background Absolute beam energy Safety

12C(α, γ)16O S-Factor Statistical Error: dominated by background subtraction from 18O(γ,α)14C (depletion = 5,000) Systematic Error: dominated by absolute beam energy (= 0.2%) SE1(300 keV) = 74±21 keV b

Schedule 12GeV CEBAF Commissioning: Bubble Chamber Activities: Install beamline, radiator and dump Commission beamline, radiator and dump Install Bubble Chamber Commission Bubble Chamber Physics run Start End Period I 2013-11-04 2013-12-20 SAD I 2014-01-02 2014-02-05 Period II 2014-05-07 SAD II 2014-09-22 Period III 2014-12-19 SAD III 2015-01-02 2015-02-13 Period IV 2015-06-12

Design of beamline, Radiator & Dump Need to design new beamline to replace PEPPo beamline and increase the distance between the two BPMs Radiator: 0.02 mm and 0.1 mm Copper Electron Dump: 2kW dump (10 MeV, 200 µA) Photon Dump

Electron Beam 3.0 – 8.5 MeV (K.E.) 0.01 – 100 µA Al Photon Dump 10 cm long 20 cm diameter Sweep Magnet Cu Vacuum Window 10 mil Cu Radiator 0.02 mm Cu Photon Collimator 50 cm 50 cm Cu Inner Pipe Al Beam Pipe Bubble Chamber Superheated N2O 3 cm long 15°C, 60 atm Cu Electron Dump

BCM 5 MeV Spectrometer 5 MeV Dipole 27’’ PEPPo/Bubble Chamber Beamline Bubble Chamber location

Simulation Two programs: GEANT4 FLUKA Both use models that calculate wrong cross sections. Both do not allow for user’s cross sections. Suggestion: Use GEANT4 and FLUKA to produce the photon spectrum impinging on the super heated liquid. Fold the above photon spectrum with our cross sections in stand-alone codes. Both GEANT4 and FLUKA are good in neutron tracking. Still need to check the neutron cross sections.

Background Must measure: Rates: Natural Abundance: 17O: 0.038% 17O(γ,α)13C , enrichment=10% 18O(γ,α)14C , enrichment=10% Rates: 17O(γ,α)13C, depletion=5,000 18O(γ,α)14C, depletion=5,000 14N(γ,p)13C, detection eff.= 10-8 Natural Abundance: 17O: 0.038% 18O: 0.205% Still need to study 17O(γ,n)16O, …

Safety High pressure system Super heated liquid: N2O or CO2 Buffer liquid: Mercury

Running in FEL? Absolute Beam Energy: FEL can measure the energy with a precision of 0.4%. However, it could be very hard to improve (?) Required Systems: Personnel Safety System (PSS) Liquid helium and RF Gun Laser Staff

Planning Meeting Do we want to meet every two weeks? Wednesday 3:00 – 5:00 pm?