hall c users meeting january 22-23, 2018...commissioning experiments december 2017 shms (and hms)...
TRANSCRIPT
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