Midwest θ13 Meeting August 11, 2004 Matthew Worcester

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Presentation transcript:

Midwest θ13 Meeting August 11, 2004 Matthew Worcester Monte Carlo Work Midwest θ13 Meeting August 11, 2004 Matthew Worcester

Outline Additions to ReactorFsim CVS Documentation Future plans Sources PMT radioactivity Muons CVS Documentation Future plans

Sources 252Cf neutrons 208,210Tl γ’s 212,214Bi γ’s Watt spectrum Prompt photons Needs multiplicity 208,210Tl γ’s Correct multiplicity and energies 212,214Bi γ’s

252Cf source at R=0

Rate = NPMT × PMTradioactivity × Nγ NPMT = 816 with R2 = 325 cm PMTradioactivity ~ 10 decays/PMT/sec (for R5912s from Hamamatsu) Nγ = number of γ in scintillating region from ReactorFsim with:

PMT radioactivity 10k decays generated at each oil buffer thickness Isotropic γ production at each PMT Each decay occurs at R2 = 325 cm Compton scattering through the oil buffer Equal #s of decays from 208Tl,210Tl,212Bi,214Bi

PMT radioactivity

Muons Starting points: Propagate muons through ReactorFsim Muon flux with energy and zenith angle spectra underground with GEANT4 by Martina and Jim Spallation cross-sections for 9Li, 8He from Hagner, et al. paper Propagate muons through ReactorFsim Just getting started

CVS CVS server running on cp4.uchicago.edu First time users email me to get a CVS account and password: mworcest@hep.uchicago.edu Instructions at: http://mwtheta13.uchicago.edu/software/cvs.html Primitive versioning No controls on CVS checkin: users must police themselves

Documentation Online code browser: http://mwtheta13.uchicago.edu/software/codebrowser.html Cross-linked listing of all ReactorFsim files Available for each version of code Generated with Doxygen Requires additional documentation in the code (much more needs to be written) TeX reference manual Also from Doxygen

Future plans Finish muons Radioactivity from steel/acrylic parts More studies (see Josh’s talk) Decide how far to push this simulation: Should we reconstruct entire events? How to arrange the timing?

Scintillator teststand Everyone at Chicago involved Small (V ~ 360 mL) scintillating volume observed by two PMTs Readout by ADCs and TDCs or oscilloscope Muon veto counters Initial goals: learn what we can, try pulse shape discrimination

Electronics

Pulse shape discrimination Read out PMT pulses with ‘scope and sum both PMT Find the pulse peak (t = 0) Integrate for 300 ns: Total charge from t = -10 ns (entire pulse) Delayed charge from t = +25 ns (tail of pulse)

Pulse shape discrimination

Future teststand work Use other scintillators Larger system: Gd-doped Better PS discrimination Larger system: Cylinder (R ~ 20 inch, L ~ 1.5 m) Observed by R5912 (low-rad glass) PMTs (some parts ordered) Current DAQ easily upgradeable Lots to do!