NPS/CPS Collaboration Meeting

NPS/CPS Collaboration Meeting

Tanja Horn

1 February 2019

Jefferson Lab, Newport News, VA

History of NPS Meetings

10 November 2012: Workshop on Opportunities for DVCS and other

physics with NPS (IPN-Orsay)

14 November 2013: NPS Collaboration Meeting (JLab)

19 November 2014: NPS Collaboration Meeting (JLab)

15-16 June 2015: NPS and PbWO4 Meeting (JLab)

21 January 2016: NPS Collaboration Meeting (JLab)

19 January 2017: NPS Collaboration Meeting (JLab)

6-7 February 2017: High-Intensity Photon Sources Workshop (CUA)

23 January 2018: NPS Collaboration Meeting (JLab)

1 February 2019: NPS Collaboration Meeting (JLab)

13-15 November 2018: NPS Frame Meeting (JLab)

Magnet – assembly, design, and testing

Frame – mechanical design and infrastructure

Infrastructure Hall C – cables, mechanical design, platforms, etc.

Infrastructure Hall C – DAQ and electronics

Infrastructure Hall C – trigger and electronics tests

Crystal characterization

Prototype

Controls and monitoring

Simulations and software development

NPS Project Status Overview

Prospects glass scintillators

Fully assembled, infrastructure ready in testlab, mapping software and hardware ready to go (C. Hyde + ODU team, W. Akers, W. Kellner + Hall C techs, B. Wojtsekhowski, CUA)

NPS Magnet – assembly, design, testing

NPS High Voltage Dividers – design and assembly

Assembly of ~1100 dividers ongoing

Design final and assembly of NPS dividers ongoing at OU (J. Roche + OU team, F. Barbosa, H. Mkrtchyan + Yerevan team, V. Popov)

Tests show that amplitude within 1-1.5% up to 2 MHz

Design mostly done – discussions for finalization of NPS to Hall C infrastructure matching (e.g. connectors) on 11/13-11/15 2018 (C. Munoz-Camacho + IPNO team, S. Lassiter, P. Medeiros, M. Fowler and JLab team, CUA)

NPS Frame – mechanical design

Mechanical assembly demonstrated, full frame being built at IPNO - modular

NPS Frame – mechanical design and infrastructure

Design mostly done – discussions for finalization of NPS to Hall C infrastructure matching (e.g. connectors) on 11/13-11/15 2018 (C. Munoz-Camacho + IPNO team, S. Lassiter, P. Medeiros, M. Fowler and JLab team, CUA)

HV cable/connector choice final, signal cable/connector from NPS to Hall: most likely LEMO, but double checking space

Infrastructure Hall C – cables and connectors

High Voltage cables and connectors - final

Top and outside NPS multi-channel connectors – standard CAEN 52-pin cables, requires 20-21 multi-conductor cables (RG58 or RG59)

HV patch/breakout panels at front of SHMS deck, then route upstairs to CH

HV crates – plan to order for Hall C in FY19, CAEN HV cards with 1mA/channel is sufficient for NPS (divider currents in range 300-400 uA at operating voltage 1.0-1.5 kV)

Signal cables and connectors – mostly final

Inside NPS: short flat micro ribbon coax cables

Top of NPS: BNC or LEMO connectors depending on space availability

Movable patch panel located near NPS that moves along with detector, from there route high density cables (BNC) – SHMS carriage patch panel is BNC too

High density BNC patch

High density HV breakout panel (BETA weldment in ESB)

Infrastructure Hall C – mechanical design, platforms etc.

Overall layout is done

Platform design being worked on by S. Lassiter + JLab team.

Three representative configurations

Infrastructure Hall C – DAQ and electronics

Overall strategy is straightforward and final (B. Sawatzky, A. Camsonne, S. Wood)

NPS Readout Hardware

Numberneeded

Unit price K$

FADC 41 4 164

VXS 2 15 30

SD 3 4 12

TI 3 4 12

CPU 3 4 12

VTP 5 7 35

265No

FADC cost

101

Notrigger

66

Hardware available from Hall A/C and physics division

Current Hardware count

Infrastructure Hall C – trigger and electronics tests

Overall strategy is straightforward and final (B. Sawatzky, A. Camsonne, S. Wood)

Infrastructure Hall C – trigger and electronics tests

Test setup SHMS to check: occupancies, pile-up, timing resolution, data rates, resolution, radiation damage – planned for Spring 2019 (A. Camsonne)

NPS Crystal Characterization

FY18: 460 SICCAS crystals and 100 CRYTUR crystals characterized – 145 are in HD

FY19: procurement 400 SICCAS crystals pending, 250 CRYTUR crystals expected by October 2019

Some delays as had to ship back 160 SICCAS crystals for replacement

CRYTUR crystal quality superior to SICCAS – measurements important for placement in NPS detector, e.g. SICCAS away from high radiation zones

Full crystal characterization facility at CUA (V. Berdnikov, T. Horn, VSL) and high dose irradiation at IPNO (C. Munoz-Camacho, H-S Ko, W. Rong)

Transmittance Light Yield Radiation Hardness

COMCAL (NPS crystal prototype) serves as test for mechanical assembly, controls and software development, and component/data taking improvement. Installed in Hall D, commissioned, and taking data (V. Berdnikov, A. Somov + Hall D team)

NPS Prototype

Calibration code written for prototype (V. Berdnikov/CUA) – can be adapted for NPS

NPS Controls and Monitoring

Slow controls developed for COMCAL (NPS Prototype) (H. Egiyan) - can be ported to Hall C

GEANT4 model developed by H-S Ko (Orsay) for energy resolution studies –additional simulation software developed by V. Tadevosyan + Yerevan team

NPS Software and simulations development

Analysis software developed for prototype can be adapted for NPS analysis – Hall A DVCS data analysis software provides additional benefits (C. Munoz-Camacho + IPNO team, J. Roche + OU team, C. Hyde + ODU team)

Glass scintillators being developed at VSL/CUA/Scintilex – optical properties comparable or better than PbWO4

NPS prospects glass scintillators

Preliminary tests on radiation damage look promising

Ongoing optimization work

NPS – experiments

ERRExperiment Exp # Beam TargetPAC Days Rating

π0 SIDIS E12-13-007 𝑒– L H2 (26) A–

DVCS and Exclusive π0 E12-13-010 𝑒– L H2 53 A

Wide Angle Compton Scattering (WACS) E12-14-003 𝑒−, 𝛾 L H2 18 A–

Wide Angle Exclusive p0

photoproduction E12-14-005 𝑒−, 𝛾 L H2 (18) B

Initial State Helicity Correlation in WACS E12-14-006 CPS: 𝛾 𝑁𝐻3 15 B

ALL & ALS Polarization Observables in WACS at large s, t, and u

C12-17-008E12-17-008 CPS: 𝛾 𝑁𝐻3 46 A–

Timelike Compton Scattering (TCS) off a Transversely Polarized Proton C12-18-005 CPS: 𝛾 [𝑁𝐻3]T 35 C2

ERR

Presently 5 approved NPS experiments and one conditionally approved

NPS – collaboration

Consists of members involved in NPS construction plus additional collaborators on the five experiments

NPS 2018 Action Items

Finalize complete NPS detector frame mechanical design – Almost complete

o Finalize light monitoring and curing systems concepts and integrate with design of

NPS frame

o Finalize integration of temperature-stabilization system at 18o C

Finalize designs for fringe field mitigation for PMTs including the beam dump line, for

NPS at small angles, and the HMS snout, for both NPS and HMS at small angles -

Finalize design of fringe field of sweep magnet on HMS optics -

Finalize NPS magnet (steel, main coil, and corrector coil)

o Assemble magnet – done

o Map NPS magnet at low current – delay to Summer 2019

o Map NPS magnet to confirm fringe fields – 2019

Complete design of platform for NPS, both the cantilevered support at small angles, and

the platform on the SHMS carriage for NPS at large angles. – unexpected delay

o Complete design of support of cantilevered platform for NPS at small angles

Complete design for cooling water and power lines for the magnet, and electrical

power on the NPS detector platform

o Complete design of removable guard (personnel safety) rails as needed for NPS

detector frame access at small angles during maintenance periods

Finalize cabling concept, DAQ and electronics

o Complete final cabling layout for high-voltage and signal cables -

o Complete layout of patch panels and DAQ/electronics racks in SHMS hut -

o Complete a full chain test of fADC readout with the NPS 3x3 prototype, including

PMTs+HV dividers and readout system – 12x12 prototype in Hall D

PbWO4 crystals – done

o Test 500 crystals

o Move 100 145 crystals to Hall D

Frame – essentially done

o Decide on carbon structure

o Finalize integration of temperature stabilizing system, investigate cooling option

o Decide on cable connectors

o Determine placement of monitoring and curing systems

o Decide on crystal wrapping material

PMT and HV bases – essentially done

o Finalize concept for board layout and connectors for HV and signals – depends on final

design of calorimeter temperature-controlled box and location of HV and signal patch panels

o Decide on connectors

o Production of HV dividers

o Prepare assembly manual in collaboration with JLab

o Determine voltage margin and study temperature stability with gain

Software and simulation development

o Online software – not done, but taking advantage of Hall D prototype

o Offline software: reconstruction - 2019

Compact optimized High-Intensity Photon Source – essentially done

o Remove condition from polarized WACS experiment

o Add polarized target, check shielding optimization

o Decide on what engineering items needed for internal review document

o First engineering changes for Hall D after Hall A/C done

o Submit KLong experiment proposal to PAC46

Future physics with NPS and CPS

o For TCS, address three points: - somewhat done, conditionally approved experiment

1) does experiment with NPS and transverse target provide unique access to GPD E/orbital

angular momentum

2) is it competitive with other methods on the market, e.g., HDICE,

3) Impact of secondaries on detector operation

o Consider further high-quality unique science that could be considered with the NPS, with

availability of intense electron and photon sources.

Goals of this meeting

Discuss path forward for Compact Photon Source (CPS) and

polarized targets

Formulate 2019 action items for NPS construction and science

Discuss timeline/requirements of component tests and assembly

of NPS

Preparations for the Experiment Readiness Review (ERR)