Hall C KPP Demonstration March 10, 2017

GLOSSARY Acronym Description SHMS Super High Momentum Spectrometer NGC Noble Gas Cerenkov HGC Heavy Gas Cerenkov Shower Electromagnetic Calorimeter PSh Pre-Shower Calorimeter S1 / S2 Hodoscope Scintillator Array 1 / Array 2 PMT Photomultiplier Tube TDC Time-to-Digital Converter

Hall C KPP Run Period March 7–10, 2017 Beam ~ 5 mA CW Target BeO, Carbon

Hall C KPP Run Period SHMS Spectrometer – installation & Project commissioning complete

Hall C KPP Run Period SHMS settings: Momentum: 3 GeV/c Angle: 15º All magnets operational during KPP run period. Magnet Current vs Time Note: to verify polarity, magnets were occasionally ramped down and currents reversed.

Hall C KPP Detector operational: events recorded with a > 2nA electron beam at > 6 GeV beam energy (3 pass). KPP Demonstration Criteria: Detector running for 8 hours recording data from all subsystems. Screenshots of beam status and/or accelerator e-log entries demonstrating electron beam current and energy. Data showing relative timing of trigger, tracking, and particle identification in detector subsystems. Figures demonstrating charged-particle tracks from position-sensitive detectors. Particle identification plots using signals from calorimetry and Cerenkov detectors.

#1: Detector running for 8 hours 1. Detector running for 8 hours, recording data from all subsystems. Snapshot of Production run-start log entries (12h) Snapshot of timestamped datafiles (24h) Beam current stripchart (12h) coda@cdaq[4][pts/38]:/net/cdaq/cdaql3data/coda/data/raw Beam Current [mA] Label step [2 hours]

#2: Beam Status 2. Screenshots of beam status and/or accelerator e-log entries demonstrating electron beam current and energy. mA Beam Established: Log Entry: 3466542 Beam Energy, Current & Beam Position readbacks show beam to Hall C E = 6.406 GeV/c Current = ~ 5 mA Snapshot of Target Ladder Camera Log Entry: 3466543 Shows beam illuminating BeO target in Hall C

#3: Detector Performance 3. Data showing relative timing of trigger, tracking, and particle identification in detector subsystems. Hodoscope Timing 4 hodoscope planes in SHMS S1X, S1Y, S2X, S2Y Each plane composed of 13–21 individual detectors (“paddles”) Horizontal axis is paddle # Vertical axis indicates time of hit in nanoseconds relative to trigger Horizontal red / high-intensity stripe indicates all active paddles in each plane are seeing hits within 5–10 ns of each other [Left-side PMT signals shown “-”. Right-side PMT signals “+” ; are essentially the same.] Paddle Number Time [ns] S1X- TDC time vs Paddle # S1Y- TDC time vs Paddle # S2Y- TDC time vs Paddle # S2X- TDC time vs Paddle #

#3: Detector Performance 3. Data showing relative timing of trigger, tracking, and particle identification in detector subsystems. Time [ns] PreShower Left Side Timing HGC Timing PMT Number NGC Timing Shower Timing HGC, NGC Timing Horizontal axis is PMT # Shower Timing Pre-shower Timing PreShower Right Timing PMT Number PMT Number

#3: Detector Performance 3. Data showing relative timing of trigger, tracking, and particle identification in detector subsystems. Wire Drift Chambers 2 wire drift chambers provide tracks for charged particles 6 wire planes per chamber Figure shows time distribution histograms of particles passing by the wires in all 6 planes All planes have similar timing structure, minimal background All planes have similar counts indicating equal detection efficiencies See Criterion #4 for track reconstruction Wire Drift Chamber Timing Timing relative to Trigger [ns]

#3: Detector Performance 3. Data showing relative timing of trigger, tracking, and particle identification in detector subsystems. HGC Heavy Gas Cerenkov (HGC) Filled with CO2 Noble Gas Cerenkov (NGC) Filled with Argon Performance plots (right): Electrons generate large signal 'Other' generate no/small signal Note: Additional particle ID plots associated with Criterion #5 Black = total Red = electrons Blue = other Number of Photo-electrons NGC Run 478 NGC T->Draw("P.ngcer.adc_p[0]>>(500,1,10000)","P.tr.x[0]>0&&P.tr.y[0]>0") T->Draw("P.ngcer.adc_p[0]","P.tr.x[0]<0&&P.tr.y[0]<0","same") HGC T->Draw("P.hgcer.adc_p[1]>>(500,1,2000)","P.tr.x[0]>0&&P.tr.y[0]<0") T->Draw("P.hgcer.adc_p[1]","P.tr.x[0]<0&&P.tr.y[0]>0","same") Black = total Red = electrons Blue = other Number of Photo-electrons

#4: Detector Performance 4. Figures demonstrating charged-particle tracks from position-sensitive detectors. Preshower S1x S1y S2x S2y Wire Chambers Shower Run 488, Event 16 Tracking / Event Display Two perspectives on the same event shown in Hall C event display. Red track generated by Wire Chamber data only Visual confirmation that the other detector elements along the track do indeed see the same particle [NGC, HGC give negligible position information and are not shown here.]

Preshower Energy (arb. units) Preshower Energy (arb. units) #5: Particle ID 5. Particle identification plots using signals from calorimetry and Cerenkov detectors. HGC vs PSh Electrons HGC Signal (arb. units) NGC vs PSh NGC Signal (arb. units) Preshower Energy (arb. units) Pions Preshower Energy (arb. units) arb. = arbitrary

Shower Energy (arb. units) Preshower Energy (arb. units) #5: Particle ID 5. Particle identification plots using signals from calorimetry and Cerenkov detectors. Electrons Shower Energy (arb. units) Pions Preshower Energy (arb. units) arb. = arbitrary

KPP Demonstrated Detector operational: events recorded with a > 2nA electron beam at > 6 GeV beam energy (3 pass). Detector running for 8 hours recording data from all subsystems. Screenshots of beam status and/or accelerator e-log entries demonstrating electron beam current and energy. Data showing relative timing of trigger, tracking, and particle identification in detector subsystems. Figures demonstrating charged-particle tracks from position-sensitive detectors. Particle identification plots using signals from calorimetry and Cerenkov detectors.