KPP November 30, 2014
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Revision as of 09:12, 1 December 2014 by Cmeyer (Talk | contribs) (→Proposed Key Performance Parameters from November 21, 2014)
Contents
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.
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Agenda
Proposed Key Performance Parameters from November 21, 2014
This section was updated after the meeting on Nov 30
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.
- 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
- 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
- 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
- Done - TAGx TDC signals are out of the readout window yet
- 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
- Plots of reconstructed particle trajectories showing target position.
- Log Entry 3309411 z-vertex distributions (the pre-beam chamber alignment was used)
- Log Entry 3309273 Geometrical matching of tracks to TOF
- Log Entry 3309018 Geometrical matching of tracks to FCAL
- Done - X-Y vertex plot from the same data should be also presented
- Particle identification plots using signals from calorimetry and timing detectors (e.g. FCAL, BCAL, TOF).
- GlueX-Doc-2609 Local copy. Proton/pion identification by dE/dx in CDC and FDC.
- GlueX-Doc-2610 Local copy pi0 reconstruction in FCAL. The initial calibration was off by a factor of 2, indicated both by the pi0 bump and by the E/p ratio for electrons/positrons
- GlueX-Doc-2611 Local copy More details on pi0 reconstruction in FCAL.
- Local copy. pi0 reconstruction in FCAL - another analysis. The MIP signal in FCAL is more pronounced. The energy scale is different from the first analysis (different calibration?).
- Done? There are several PID signals: proton/pion in both drift chamber packages, electrons in the Forward Calorimeter and &pi pi0 reconstruction in the FCAL. Detector calibration will be needed to improve all of these signals.
Path forward and goals for running in December 2014
- Trigger/DAQ time adjustment to readout the tagger TDCs
- Reduce the background in the PS (secondary collimator installation?)
- TAGH/M time calibration with the PS trigger (4h data taking), PS calibration, measuring the beam flux
- Trigger setting for BCAL+FCAL, FCAL*ST and other combinations, mix the PS trigger with the others (2 shifts)
- DAQ: improve the speed to at least 1kHz with <20% of dead time (full readout of compressed readout)
- Data taking for FCAL calibration with pi0s (at least 4 shifts)