Stephen Wood

Hall CUsers Meeting

January 22-23, 2018

Publications and Students

Slide 2

Publications:GEp-III – GEp-2ɣ archival paper – improved GEp-2ɣ error bars

Phys Rev C 96, 055203 (2017)

Comparison of Moller and Compton electron-beam polarimetersPhys Lett B 766, 339 (2017)

Qweak result – submitted to NatureEncouraging feedback from referees

Hypernuclear (HKS) technical paper – submitted to NIM (arXiV:1709.05682)Kaon form factor from 6 GeV data paper submitted – (arXiv:1801.01536)E00-002 – FL at low Q2 – submitted to PRC (arXiv:1606.02614)

Graduated Students:Qweak: Wade Duvall, Valerie Gray, Martin McHugh, Michael Moore, Hend NuhaitKaon Electroproduction: Marco Carmignotto

Meson production: Samip Basnet, Wenliang Li

Commissioning ExperimentsDecember 2017

SHMS (and HMS) commissioning at 1-pass

January-March 2018

Continue commissioning at 3-pass

~25 PAC days – Commissioning “Experiment”

E12-06-107 search for color transparency

A(e,e’p) only – “easy” coincidence measurement

E12-10-002 F2p,d structure functions at large x

Momentum scans help understand acceptance

2 days E12-10-108 EMC Effect

Integrate light nuclei with F2 run,

Point target helps acceptance studies.

3 days of E12-10-003 d(e,e’p)

Push to lower cross sections

E12-09-017 SIDIS TMD

Started!

Recent preparations for running

Slide 4

Shielding installed to cover gaps around SHMS dipole. (Lead filled boxes)

Maintenance of HMS magnets, SHMS magnet shakedownCryogenics, NMR probes, …

Studies of SHMS and HMS magnets to establish operation procedures

KPP B v I curves (See Holly Szumilla-Vance talk)

New UV-glass PMTs installed on 4th hodoscope plane (quartz bars). (See Simona Malace/Carl Zorn talk.)

New Drift Chambers (from HU) installed in HMSSame design style as SHMS chambers

(See Bishnu Pandey talk – June 2017 Hall A/C Meeting)

Commissioning

Slide 5

SHMS commissioning data taken at 2.2 and 6.4 GeV

Optics data taken

Sieve slit holes imaged with COSY matrix elements

12C ground state and 4.4 MeV state have expected angular dependence

Coincidence DAQ established

yp_tgt0.03- 0.02- 0.01- 0 0.01 0.02 0.03

xp_t

gt

0.06-

0.04-

0.02-

0

0.02

0.04

0.06h_xptgt_yptgt

Entries 398119Mean x 0.01012- Mean y 0.003966- Std Dev x 0.01038Std Dev y 0.02371

210

310

h_xptgt_yptgtEntries 398119Mean x 0.01012- Mean y 0.003966- Std Dev x 0.01038Std Dev y 0.02371

d= 0.0

hxfp_ypcut_0Entries 19103Mean 2.297Std Dev 1.053

X_fp0 0.5 1 1.5 2 2.5 3 3.5

cou

nts

0

200

400

600

800

1000

1200

1400

hxfp_ypcut_0Entries 19103Mean 2.297Std Dev 1.053

d= 0.0 Yp_tgt = -0.0235 and Xp_tgt = 0.0010

hxfp_ypcut_3Entries 6139Mean 1.93Std Dev 1.062

X_fp0 0.5 1 1.5 2 2.5 3 3.5

cou

nts

020406080

100120

140160180200220240

hxfp_ypcut_3Entries 6139Mean 1.93Std Dev 1.062

d= 0.0 Yp_tgt = -0.0075 and Xp_tgt = 0.0010

! = 7.5o – 1.35o

! = 7.5o – 0.4o

12C g.s.

12C g.s.

12C 4.4 MeV

12C 4.4 MeV

4 ns RF structure(4 hall operation)

For better/more up to date plots: See talks

Run update, Optics, Quartz Plane, Analyzer, DAQ,+ 4 commissioning experiments

Shifts Available!

Slide 6

Hall receiving steady beam at currents up to 65 uA.

Hall equipment functioning well.

Just 8 shifts required for authorship on all four commissioning experiments!

Shift signup link on Hall C home page.

Training:

Radworker I, ODH, Hall C Safety walkthrough

+ read COO, ESAD, RSAD and ERG (also linked on home page)

Target training needed for target operator. (Training good for halls A+C).

Polarized 3He Target StatusImprovements and continued developmentPhase I upgrade of existing target

- Implementable in either Hall (C or A)- 40 cm production quality cell at JLab

- Systems design for Hall C in progress

- Can be installed with ~6 months noticeNguyenTonNov2017

Heater

Targetarea SmallShieldedarea

Airflowmeter

Thermalcouple

Correction coilsx4pairs

Oven&cellRTD

NMRRFcoils

EPRRFcoil

Holding fieldcoilsx2pairs

NMRpickupcoilsx4pairs

Reference cell

Cooling Jet

RTDx10

NMRpre-ampx4 EPRRFamplifier

Tocounting house

Heaterrelaybox

TransformerD2diode

Referencecellcontrol

Holding fieldPowerSupply(HP6675A)x2

Current Meter(Fluke45)x2

RTDReadout

Tocounting house

EPICSIOC

Spectrum Analyzer5-to-1Combiner

MotorControl

ShieldedArea

OpticArea

LaserOptics

Rotatable !/4 platex6

5-to-1Combiner x2RTDx12

Raytum lasers

Correction coil PSx4

GPIB-ENET

AnywhereUSB

GPIBCoaxialWirePowerwireUSBNetwork

SerialFiberOtherInterlock

Cooling jetcontrol

ToNetwork

Targetladderandcontrol

TargetSysteminsideHallC

BelowTargetArea

x8

x4

X8x8x10

x2

x12 x10

FieldSweepTrigger(Wavetek 80)

Holding FieldControl(DS345)

EPICS/IOC ToNetworkTemperature

Readout/InterlockChassis

LaserControlledRoom

PbWO4NPS

q Magnet: corrector and main coil construction complete, corrector

coil is in test lab, yoke steel cutting nearly final, setting up space

in test lab for assembly

q PMT and HV bases: design drawings final, prototyping,

procurements started

q Frame and integrated systems: concepts and initial

design complete, detailed drawings to be presented

this week

q Crystals: 460 crystals procured from SICCAS, full

crystal testing facilities at CUA and IPN-Orsay,

chemical analysis and crystal growth in collaboration

with the VSL, synergy with EIC crystal calorimeter

R&D, cleanroom ready

Main coil before shipping

The NPS PbWO4-based calorimeter

Four fully approved experiments, supported by NSF MRI PHY-1530874 (CUA, OU, ODU), international (IPN-Orsay, Glasgow, Yerevan), and JLab – one conditionally approved experiment.

BTCP SICCAS CRYTUR

Microscopy images of crystal surface

Precision tool for crystal dimensions

NPS – Project Status

NPS Detector – crystal stack, 30 by 36 matrix

Existing Rails3m travel

Hall C Beam Pipe

New base

Detector center 45.5” above deck

Incomplete frame design

Comments about LAD/NPS- Planning to start HV/Signal

cabling for NPS & LAD

- Do at least enough to support LAD first

- Similar patch panels (HV breakout and signal) at front of SHMS deck

- Procure some electronics as funds available- TI boards

- VXS crates

(Hermetic) Compact Photon Source – C & DFurther worked out CPS engineering design concept for Hall C (or A) – basic layout will also work for CPS in Hall D Tagger Vault: if one uses a 2nd raster system for Hall D to compensate for the initial 1 mm raster this can be an equivalent essential design

Some differences…• Hall D alcove has more space, so simpler positioning and shielding placement• Hall D up to 60 kW (<5 µA @12 GeV), Halls A/C up to 30 kW (2.6 µA @ 11 GeV)• Different length/field magnet for Hall D & Shielding may differ.

10% radiator

B ~ 3.2 T

Due to the use of a Cu core: Tmax = 380 C

Maximum heat density in core = 584 W/cm3

After 1000 hours, the accumulated 1-MeV-Nu damage to silicon at the pivot is less than 1012 at 20 cm away from beam line. Outside a (10 cm) borated plastic layer it is several 1011

The dose rate from activation 1 hour after the beam is shut down at the pivot is ~1 mrem/h.

à CPS design concept is maturing!

Slide 11

NIM Article on SHMS

Howard Fenker volunteered to organize technical description of the SHMS

spectrometer (Nuclear Instruments & Methods in Physics Research)

Motivation for spectrometer

Design principles/specifications

Magnet characteristics (leave engineering details for other pubs)

Detector descriptions - design and performance

Optics – design and calibration

Commissioning results

PID – design and performance

Existing material (Manual, Howtos, CDR?,Wiki?) could be starting point for some sections.

Contributors welcomed