Documents

Publications

• Ho-San Ko, Neutral Pion Electroproduction and development of a Neutral Particle Spectrometer, tel-02927155, 2020UPASS129 (2020)

• T. Horn, V.V. Berdnikov, et al., Scintillating crystals for the Neutral Particle Spectrometer in Hall C at JLab, Nucl. Inst. Meth. A, Volume 956, 11 March 2020, 163375

• T. Horn, A PbWO4-based Neutral Particle Spectrometer in Hall C at 12 GeV JLab, J.Phys.Conf.Ser. 587 (2015) 1, 012048 (CALOR2014 Proceedings)

• SCINT2015 Proceedings

PAC Presentations and NPS Physics Notes

Physics Notes

DVCS/pi0 Cross Sections and SIDIS pi0

• Rafael's second report on DVCS simulations (including results for all energies from kinematics table)

• Rafael's first report on DVCS simulations

• Charles presentation from Hall C meeting, 24 January 2013

• Study of effects on kinematics if require HMS angle to be >=13 deg (.pdf)

• Beam Time Sharing DVCS and pi0 (.pdf)

• Notes on exclusive pions from Peter Kroll, Nov 2012

Wide-Angle Compton Scattering (WACS)

• New kinematics from David based on 8 Nov. 2013 collaboration meeting discussions (Nov 2013)

• Simon's report on WACS simulations

• Notes from Peter Kroll, Nov 2012

WACS Neutral Pion Photoproduction

• Ratio pi0/pi+ from Peter Kroll model at 90CM

• Ratio pi0/pi+ t dependence from Peter Kroll model

Calorimeter

NPS Geant4 simulation for Hall C DVCS

• GitHub: use DVCS_evt_gen/.

• A very short User Guide.

NPS software and calibration

• Energy Calibration of NPS Calorimeter, June 2020

Crystal characterization

• Table of results of SICCAS crystals produced in 2014 and 2015 - measurements carried out at CUA

• Results of tests of subsets of the 10+5 SICCAS produced crystals (2014) at Giessen, BNL, and Caltech

• Results of crystals 2, 3, 6, 8, and 9 from Giessen:

• Absorption coefficient
• Transmittance
• Light Yields: LY_2, LY_3, LY_6, LY_8, LY_9

• Results for crystals 5 and 11 from Caltech and comparison to CMS crystal performance
• Results for crystals 7 and 15 from BNL

• Hamlet's report on crystal properties from Hall C meeting, 24 January 2013

• PbWO4 references:

• P. Adzic et al., "Radiation Hardness qualification of PbWO4 scintillation crystals for the CMS Electromagnetic Calorimeter", CMS Note 2009/016
• A.A. Annenkov et al., "Lead Tungstate scintillation material", NIM A 490 (2002) 30-50
• P. Yang et al., "Growth of large-size crystal of PbWO4 by vertical Brigdman method with multi-crucibles
• R. W. Novotny, "The Electromagnetic Calorimetry of the PANDA Detector at FAIR", J. Phys. Conf. Serv. 404 012063 (2012)

PMTs

• PMT specs: Hamamatsu R4125, 19mm diameter, gain is about 8.7E+5 at 1.5kV max. anode voltage and rise time 2.5ns. This PMT was also used in Primex and we have designed a new active voltage divider that improves the performance of the PMT by a factor of 25. See the report at the 2012 IEEE NSS/MIC/RTSD conference by V. Popov and H. Mkrtchyan.

• New Active PMT Base for PbWO4 (Popov, H. Mkrtchyan, presentation at IEEE, Nov 2012)

Hamamatsu PMT Specs 11 Oct 2013, C.E.Hyde

• Media:AGhassemi-email-11Oct2013.pdf

• specs on standard 1" PMTs:

R8619 10 stage PMT

R9800 8 stage PMT

Low profile (short) 29mm R7111 PMT Media:R7111.pdf

• Mesh Dynode PMT (30x30 mm2) Media:R11187_data_sheet_0911.pdf R11187=replacement for Hall A DVCS R7877

Magnetic Field Response Media:R7877_Magnetic_Field_Characteristics.pdf

Cathode Lifetime data Media:QG1369A_R7877_Life.pdf

• R7525 29mmφ PMT Media:R7525-TPMH1244E02.pdf
• R4125 19mmφ (Standard for PbWO4)

Magnetic Field Response Media:R4125_Effects_of_Magnetic_Fields.pdf

Cathode Lifetime data Media:R4125_(100_uA_&_1000_h)_QG0016B.pdf

NPS Dose Rate Estimates

• Dose rate estimations for PbWO4 detector at 4m from target, at 1uA, and for a 10-cm long target

Scattering Chamber Information:

• outer diameter = 45 inches

• inner diameter = 43.125 inches

• distance beam line to SHMS window = 1.25 inches

So for a point target, the minimum angle is 58 mr or 3.4 degrees. For an extended target you will need to adjust, it becomes about 4 degree for a 15 cm target. So assume 3.5 degrees as rough number.

Study of possibilities for larger beam pipe assemblies

Energy spectra for electrons, photons, positrons including fits

Rates and rates per crystal vs. angle relative to beam for: 4 m from target, 6.6 GeV beam energy, 1uA beam current, and 10-cm LH2 target for:

Photon threshold=10 MeV

Photon threshold=3 MeV

History of the NPS (2012)

• Presentation at Orsay Workshop, Nov 2012

• PAC39 proposal, May 2012

Magnet

Light monitoring and Curing System

Notes on Light Monitoring System from Hamlet

Notes on Curing System from Hamlet

Electronics

• Experimental requirements on hardware:

• DVCS (Table 2 shows HMS and photon trigger rates for each of the settings.)

• Note on fADC timing from C. Cuevas