1. Hall C
KPP Demonstration
March 10, 2017

2. 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

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

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

5. 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.

6. 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.

7. #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)
Beam Current [mA]
Label step [2 hours]

8. #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:
Beam Energy, Current & Beam Position readbacks show beam to Hall C
E = GeV/c
Current = ~ 5 mA
Snapshot of Target Ladder Camera
Log Entry:
Shows beam illuminating BeO target in Hall C

9. #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 #

10. #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

11. #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]

12. #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

13. #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.]

14. 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

15. 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

16. 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.