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CT Experiment (E1206107) Run Plan

The 6.4 GeV Run Plan (52 hrs)

  • Conditions:
beam current: 65 μA
fast raster: 2x2 mm2
target: 10cm LH2
HMS/SHMS collimator: PION , COLLIMATOR
HMS/SHMS trigger: Coincidence
HMS angle/momentum Various
SHMS angle/momentum Various
  • Run Plan:
    • HMS is detecting electrons and SHMS is detecting protons.
    • Use HMS pion collimator and SHMS collimator.
    • Start with 30uA on lower 6% Carbon, after a 2 hr run, increase to 40 uA and after another 2 hr run move to the upper 6% Carbon and ask for 50 uA.
    • Keep track of good coincidence physics events (with tight PID cuts and coincidence time cut) such that we have 10000 events for LH2 and Carbon
Target Prescales HMS angle HMS momentum SHMS angle SHMS momentum Time
LH2 ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 45.1 deg -2.131 17.1 deg +5.122 12 hrs
LH2 ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 45.1 deg -2.131 17.1 deg +5.122 30 min
Al. Dummy ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 45.1 deg -2.131 17.1 deg +5.122 4 hrs
6% C ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 45.1 deg -2.131 17.1 deg +5.122 36 hrs
6% C ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 45.1 deg -2.131 17.1 deg +5.122 30 min

The 10.6 GeV Run Plan (282 hrs)

  • Conditions:
beam current: 65 μA
fast raster: 2x2 mm2
target: 10cm LH2
HMS/SHMS collimator: PION , COLLIMATOR
HMS/SHMS trigger: Coincidence
HMS angle/momentum Various
SHMS angle/momentum Various
  • Run Plan:
    • HMS is detecting electrons and SHMS is detecting protons.
    • Use HMS pion collimator and SHMS collimator.
  • H(e,e'p) Check
Target Prescales HMS angle HMS momentum SHMS angle SHMS momentum Time
LH2 ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 23.2 deg -5.539 21.6 deg +5.925 4 hrs (3 Hz)
  • Q^2 = 14.3 GeV^2 Run Plan
    • Cycle SHMS magnets since raising momentum
    • Keep track of good coincidence physics events (with tight PID cuts and coincidence time cut) such that we have 2000 events each for LH2 and Carbon
Target Prescales HMS angle HMS momentum SHMS angle SHMS momentum Time
LH2 ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 39.3 deg -2.982 12.8 deg +8.505 51 hrs
LH2 ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 39.3 deg -2.982 12.8 deg +8.505 30 min
Al. Dummy ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 39.3 deg -2.982 12.8 deg +8.505 2 hrs
6% C ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 39.3 deg -2.982 12.8 deg +8.505 122 hrs
6% C ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 39.3 deg -2.982 12.8 deg +8.505 30 min
  • Q^2 = 12.4 GeV^2 Run Plan
    • Cycle HMS magnets since raising momentum
    • Keep track of good coincidence physics events (with tight PID cuts and coincidence time cut) such that we have 2500 events each for LH2 and Carbon
Target Prescales HMS angle HMS momentum SHMS angle SHMS momentum Time
LH2 ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 31.5 deg -3.978 16.1 deg +7.502 12 hrs
LH2 ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 31.5 deg -3.978 16.1 deg +7.502 30 min
Al. Dummy ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 31.5 deg -3.978 16.1 deg +7.502 1 hrs
6% C ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 31.5 deg -3.978 16.1 deg +7.502 24 hrs
6% C ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 31.5 deg -3.978 16.1 deg +7.502 30 min


  • Q^2 = 10.0 GeV^2 Run Plan
    • Cycle HMS magnets since raising momentum
    • Keep track of good coincidence physics events (with tight PID cuts and coincidence time cut) such that we have 4000 events each for LH2 and Carbon
Target Prescales HMS angle HMS momentum SHMS angle SHMS momentum Time
LH2 ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 24.5 deg -5.259 20.6 deg +6.209 6 hrs
LH2 ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 24.5 deg -5.259 20.6 deg +6.209 30 min
Al. Dummy ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 24.5 deg -5.259 20.6 deg +6.209 1 hrs
6% C ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 24.5 deg -5.259 20.6 deg +6.209 12 hrs
6% C ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 24.5 deg -5.259 20.6 deg +6.209 30 min
  • Q^2 = 10.0 GeV^2 Proton angle (Fermi cone) scan
    • Keep track of good coincidence physics events (with tight PID cuts and coincidence time cut) such that we have 2500 events each for LH2 and Carbon
Target Prescales HMS angle HMS momentum SHMS angle SHMS momentum Time
6% C ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 24.5 deg -5.259 17.6 deg +6.209 12 hrs
6% C ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 24.5 deg -5.259 23.6 deg +6.209 20 hrs

F2 Experiment (E12-10-002) L/T measurement Run Plan

  • Experts: Simona Malace, Eric Christy
  • Expected time: 2 days at 30 muA
  • Goal: Measure one epsilon point to better constrain R at large x
  • Conditions: ONLY HMS NEEDED. Prescale to 2 kHz, cycle magnets.
beam current (uA): max current
fast raster: 2x2mm
target: 10 cm LH2, Al 10 cm Dummy
HMS collimator: PION
HMS trigger: ELREAL for physics data taking
HMS trigger: SCIN 3/4 *for one run only* in the beginning for trigger efficiency calculation (we are running one trigger at the time)
HMS angle/momentum: 65 deg / -1 GeV/c - 100 K electrons
HMS angle/momentum: 65 deg / +1 GeV/c - 10 K positrons

Deuteron Electro-Disintegration (E12-10-003) Run Plan

  • Experts: Werner Boeglin, Mark Jones
  • Graduate Student: Carlos Yero
  • Expected Time: 6 days at 70 uA
  • Goal: Measure D(e,e'p)n cross section at three kinematic settings, where FSI are small
  • Conditions: The SHMS will detect electrons and the HMS will detect protons.
beam energy: 10.6 GeV
beam current: 70 μA
fast raster: 2x2 mm
targets: 10cm LH2, 10cm LD2
HMS/SHMS collimator: Pion , Collimator
HMS/SHMS trigger: Coincidence, HMS: h3/4, SHMS: p3/4
HMS angle/momentum Various
SHMS angle/momentum Fixed
  • H(e,e'p) Check Run Plan
    • Check the HMS/SHMS spectrometer pointing
Target SHMS angle SHMS momentum HMS angle HMS momentum Time
LH2 12.169 deg -8.70 GeV/c 37.339 deg +2.938 GeV/c 1 hr
  • D(e,e'p)n Run Plan
    • Calibration run at low missing momentum used as a cross check with existing data
    • Measure the D(e,e'p)n Cross Section at unexplored high missing momentum kinematics settings
Target SHMS angle SHMS momentum HMS angle HMS momentum Missing Momentum Time
LD2 12.169 deg -8.70 GeV/c 40.061 deg +2.435 GeV/c 80 MeV 1 hr
LD2 12.169 deg -8.70 GeV/c 53.252 deg +2.305 GeV/c 500 MeV 8 hrs
LD2 12.169 deg -8.70 GeV/c 56.401 deg +2.220 GeV/c 650 MeV 18 hrs
LD2 12.169 deg -8.70 GeV/c 59.388 deg +2.120 GeV/c 800 MeV 36 hrs

Fall 2017 Commissioning Plans

Spring 2017 KPP run

Hall C Links

Hall C

Hall C is one of four experimental halls at JLab.

Hall C Computing.

Hall C in the Press.

Basic Equipment in Hall C

Beamline

SHMS Magnets

For the Fall 2017 run, see intructions at https://hallcweb.jlab.org/wiki/index.php/How-to

The formulas and program should be kept in sync with the repository.


  • Formulas used for setting current of SHMS magnets during KPP
Magnet Formula
HB Current = 330.05*p - 3.1784*p^2 + 0.4018*p^3
Q1 Current = 222.4*p - 7.709*p^2 + 0.6684*p^3
Q2 Current = 3661*p/11
Q3 Current = 2434*p/11
Dipole Current = 3450*p/11

Scattering Chamber

  • The scattering chamber window on the SHMS side is 0.020 inches thick 2024-T4 aluminum.

SHMS Entrance Window and Vacuum vessel

  • The Horizontal Bender entrance window is 0.010 inches thick 2024-T3 aluminum.
  • The dipole exit window is 0.020 inches thick 5056 aluminum.

Target

Spring 2017 KKP run

Fall 2017 run

  • Logbook entry on the Fall target configuration which has links to file describing the targets and their thicknesses and a file with the mechanical drawing of the target ladder.
  • BeO target was replaced by the "halo" cylinder target. Logbook entry with drawing of "halo" cylinder target.
  • Drawing of target ladder with cryo cells and solid target ladder.
  • Drawing of cryotarget cell with 2.5inch diameter and 10 cm long (after using insert entrance window). Used for separate LH2 and LD2 cells in ladder.
  • Drawing of cryotarget with 1.6 inch diameter for 4cm cell.
  • Drawing of cryotarget with 1.6 inch diameter for 10cm cell.

HMS Magnets and Vacuum Vessel

HMS Detectors

SHMS Detectors

DAQ & Trigger

Controls

  • High Voltage
  • Spectrometer Controls (Use go_cmagnets command)
  • HMS and SHMS Collimator Control document.

Online Replay

Data Analysis

Monte Carlo

Hall C at 12 GeV

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