Difference between revisions of "KPP November 30, 2014"

Revision as of 02:05, 1 December 2014

Meeting Time and Place

The meeting will be on Sunday November 30, 2014 at 4:00pm EDT. No room at Jefferson Lab has been reserved.

Meeting Connections

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Agenda

Proposed Key Performance Parameters from November 21, 2014

Hall D: “Detector operational: events recorded with a > 2 nA electron beam at > 10 GeV beam energy (5.5 pass)”

Done: all data taking happened with >40 nA 10 GeV electron beam

Expected photon beam rate: Tagger: ~ 620Hz/MeV at the endpoint, at 50nA, 0.2e-4 RL. About 20% should pass through the 5mm collimator hole. Very preliminary PS measurements are about 50% off.

1. Detector running for ~one shift recording data from all subsystems.
   • ~8h data taking on Nov 23 20:00 - Nov 24 8:00 at 50 nA, 0.2e-4 RL, FCAL trigger, solenoid at 1200A
   • ~8h data taking on Nov 25 22:00 - Nov 24 6:00 at 100 nA, 1e-4 RL, BCAL trigger, solenoid at 1200A
   • Done
2. Snapshots of beam status screens and accelerator Elog entries demonstrating the electron beam current and energy.
   • Log Entry 3309203 Snapshot with 100nA, 3e-4 RL For an unknown yet reason at high beam rates some EPICS variables were stale on this window. At 50 nA these variables were updated normally.
   • Log Entry 3307724 Snapshot with 45nA. 0.2e-4 RL
   • Done The beam energy can be derived from the tagger magnet field (1.5T for 12 GeV): 1.26T/1.50T*12GeV=10.08GeV
3. Plots showing relative timing (coincidence) of the signals in TAGx, TOF, BCAL, FCAL, ST, PS (with TAGx).
   • Log Entry 3309600 TDC timing of FDC, BCAL, ST, TOF, TAGH, TAGM and the FADC timing of TAGH, TAGM for the FCAL-triggered data at low luminosity and the BCAL-triggered data at high (x30) luminosity. The TAGH/M FADC signals are in the readout window, while the TDC signals are not (further trigger/latency tuning required)
   • Log Entry 3308810 Similar to Log 3309600 for the FCAL trigger, in log scale
   • Log Entry 3308027 TAGH/M timing with the PS trigger
   • Log Entry 3309273 Geometrical matching of tracks to TOF
   • Log Entry 3309018 Geometrical matching of tracks to FCAL
   • Done - TAGx TDC signals are out of the readout window yet
4. Event displays showing correlations of particle hits in the CDC, FDC, ST, TOF, BCAL, FCAL.
   • Log Entry 3309428 3-prong event from from run 1515 (FCAL trigger)
   • Log Entry 3309427 Multi-track events from run 1515 (FCAL trigger)
   • Log Entry 3309416 Another event from run 1515 (FCAL trigger) with good matching of hits in different detectors
   • Done
5. Plots of reconstructed particle trajectories showing target position.
   • From the online logbook z-vertex distributions. We still need to show an x-y vertex plot from the same run.
   • logbook 3309273 Matching tracks to TOF.
6. Particle identification plots using signals from calorimetry and timing detectors (e.g. FCAL, BCAL, TOF).
   • Pions versus protons in the driftchambers Document from Justin. This shows clear dE/dx signals in both the CDC and FDC
   • Neutral pions in the forward calorimeter Document from Matt. Select the November 27 Update Slide.
   • Electrons in the forward calorimeter Document from Matt
   • Electrons/pions in the forward calorimeter Slide from David. There is a software scale difference with the previous slide, but we also see MIP peaks here.