HiRA Wiki

Bill, Betty, Dan, Mike, Zibi, Rachel, Suwat, Jack, Bec

• Betty: Lab moving: Asbestos in 124, abating floor. Don't go in there. Some more delay in moving, no updates to schedule
• Experiment: nothing scheduled yet, probably not running until summer at earliest
• Zibi: preamp box for Lee's exp: use one that was on top of the S800 chamber? Need a stand/small table?
• FYI: chipboards from Jack's experiment are at Wash U right now
• Micron detector: is the cable right? Dan/Mike will check.
• Bec: Miniball box: new rails (48“) will cost $250. For now we'll put in the rails from Oct 2011 experiment and plan to buy new ones when we need them
• Rachel: creating a link on wiki for Future HiRA Purchases

• Current status of efficiency program: “pixel” refers to HiRA/LASSA, “bin” refers to root plotting

1. plots pixels from data
2. For every pixel hit generate 100 random hits spread across the pixel.
3. suppress any multiple hit in a single bin
4. Project to 1D in theta: calculates the fraction of solid angle hit in the theta range chosen

• Betty suggests not randomizing: subdivide the bins evenly, put 1 hit into each, then project

• Mike: pT vs rapidity for isotopes (p,d,t,3He,alpha). Also plotting cross-sections dM/dEdOmega including lab efficiency for protons, Bill suggests putting all into one plot.
• Rachel should copy this method and attempt for her data
• Dan: putting together multi-hit events in neutron walls, trying to see what events did not make the cut. High reject rate in Wall 0 at 120 MeV. When include the PID gates as part of the cut determination, lowers the rejection rate… by a lot. Next step will cut on less overlap with the proton vetoes, should clean up some but not as much.