Difference between revisions of "The HPS Run Wiki"

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* [http://srs.slac.stanford.edu/hudson/view/HPS/job/hps-modules/ Jenkins]
 
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* [https://github.com/JeffersonLab/HPS-NOTES/tree/master/SHIFT Shift Docs @ GitHub]
 
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Revision as of 20:04, 21 March 2015


[edit]

RC: John Jaros

  • (757) 575-7540
  • 9 575 7540 from Counting Room

PDL: Harut Avagyan

Every Shift:

  1. Follow run plan as outlined by RC
  2. Once BPMs are calibrated, ask MCC if orbit locks are on, they should be.
  3. Keep shift summary up-to-date in HBLOG
  4. Document any beam condition change and send scaler GUIs to HBLOG
  5. Send "scaler_hps" GUI to logbook at least twice per shift or any time run conditions change
  6. Peform 2H02A harp scan ones per shift or when beam conditions changed based on beam monitors (BPMs, halo rates, beam-viewer)
  7. Fill out shift checklist in the logbook, HBLOG, using template at least ones per shift or when run conditions change
  8. Continuously check quality of data
  9. With any issue contact On-Call Experts or RC.

SVT Instructions

Before sending beam to Faraday cup, verify (and page expert if otherwise):

  • SVT should be open: "Position" at 0.000 mm in scaler GUI
  • SVT HV is off: all red/green indicators RED in SVT bias GUI

The first time sending beam to the Faraday cup after the hall is closed, page the SVT expert.

Every Run:

  1. a
  2. b
  3. c
  4. d


MCC Daily Meetings


Run Plan:March 21-22, 2015 (day/swing/owl)

Overview: Machine has delivered beam to Hall A. Machine instabilities prevent sending beam to Hall D. Machine will work on instabilities today, and deliver beam to Hall B, beginning with day shift. BPM calibrations are postponed to Monday--we aren't ready today, and people aren't available on Sunday. Once beams are reestablished, we'll go to backup subsystem commissioning program. Program: 1) restore beams to tagger; (2)take beams to Hall B dump and install SVT Collimator; (3) set up chicane and test beam location on target; (4)re-establish DAQ and data taking; (5) Subsystem commissioning studies: trigger commissioning studies, struck scaler studies at 2H02, SVT commissioning.

Always Setup Beam to the Hall-B Tagger Dump after long down

  • After MCC finishes beam tune
    • make sure beam conditions haven't changed, beam position and halo counter rates are as before (see logbook from previous days)
    • work with MCC to move bean position and direction to see if lower counts on upstream halo counters can be achieved (UPS-L and UPS-R)

Upstream halo counters must count <10Hz, downstream counters ~Hz

  • Perform harp scans to verify that beam profile hasn't changed, check with previous scan results: 2C21 x/y widths <50 micron, on the tagger/2C24 harp x/y widths ~300 micron. Use UPS-L for analysis, send harp scan results to the logbook
  • After beam tune is done send HPS scaler GUI to the logbook with proper comment

Setup Beam to the Hall-B Faraday cup Dump and Setup HPS.

  • Ask MCC to turn OFF the beam, turn OFF and degauss tagger magnet
  • After tagger magnet is degaussed, change beam configuration on "bta" GUI to "Electron"
  • Insert Chromax screen on the downstream viewer on the beam. Note correctors at 2H02 have been disabled.

Move beam with upstream correctors only This will guarantee small angles through HPS and safety of SVT

  • Restore 5 nA CW beam and make sure beam is ~centered on the downstream screen. Record spot.

Beam should be centered using correctors on 2C21, 2C23, and 2C24 girder

  • If everything looks normal, rates on downstream counters are <10Hz, and on HPS-L and HPS-R are <30Hz at 10nA, send main HPS scaler GUI to the logbook and proceed
  • Use 2H02A harp to measure beam profile (beam current should not exceed 20 nA), beam size should be X-width ~250 um Y-width < 50 um. Beam should be within ~1mm of recent measurements.
  • Record Ecal count rates top vs bottom. Beam centered vertically?
  • Turn beam off. Insert SVT Protection Collimator 4mm slit to its nominal position. Ecal Backgrounds? Vertically scan the collimator, measuring the halo counter rates vs vertical position. Beam should be within ~1mm of center.

Energize chicane.

  • If bpms have been calibrated, record scaler and bpm settings and beam location on screen.
  • Energize HPS chicane - ask MCC to turn beam OFF, ramp up magnets to desired currents according to procedures (use the table).
  • After magnets are at required settings (will take ~40 min) ask MCC for 10 nA beam
  • Observe beam spot on chromax viewer, beam spot should be at the same place as before magnets were turned ON. If spot is shifted, change Frascati magnets curent to correct the position - if beam is left of the original point current must be lowered, if it is shifted right current must be increased. Do current change with small steps, ~1 Amp.

Be very careful when changing magnet currents when beams are on. Must enter new current ACCURATELY. Small steps only.

  • After chicane is set, record halo counter rates, turn beam off and insert HPS target, 4um W
  • Do horizontal scan of beam on target. Using table provided, first change Frascati settings, then PS settings to move beam left and right on the target with ~1mm step. Small changes only.
  • Record halo counter rates and magnets currents. First move right, stop when rates on halo counters will increase by several times, then move left until rates will start to go up.
  • Center beam on target with appropriate chicane currents just determined. Record bpm and screen shot and Ecal scalers.
  • Do vertical scan of beam. Measure Ecal rates top/bottom vs vertical beam position. Record bpm 2H02 y and Ecal rates. Move beam vertically on bpm using upstream correctors, by 0.5 mm steps. Don't exceed 2mm motion.

Subsystem Commissioning Studies. Begin Data Taking.

  • Make sure DAQ is OK for data taking
  • Trigger commissioning data runs. See Commissioning document on run wiki.
  • Beam trip studies with Struck Scalers. See commissioning document on run wiki. Call Rafayel
  • When SVT is ready for data, begin integrated data taking. Call Omar.


Beam
Energy ~2.0 GeV
Current < 200.0 nA CW
Position
X Y
~0 mm ~0 mm
Profile
X Y
< 0.1 mm < 0.1 mm
Target
#1 0 mm
Magnets
PS Current 0 A
Chicane Dipole #1 0 A
Chicane Dipole #2 0 A
DAQ
Configuration ___________________
Configuration file
Prescales
Thresholds
Events Per Run
Dead Time




AccumulatedCharge.png


Run Coordinator
March 1 - March 11 Stepan Stepanyan
March 12 - March 18 Francios-Xavier Girod
March 19 - April 1 John Jaros
April 2 - April 8 Nathan Baltzell
April 9 - April 15 Takashi Maruyama
April 16 - April 22 Maurik Holtrop
April 23 - April 29 Raphael Dupre
April 30 - May 6 Takashi Maruyama
Physics Division Liaison
Harut Avakian
Beamline On-Call
Now Takashi Maruyama
DAQ On-Call
March 1 - May 4 Sergey Boyarinov
ECAL On-Call
March 1 - March 9 Andrea Celentano
March 9 - March 23 Nathan Baltzell
March 23 - March 30 Holly Vance
March 30 - April 13 Gabriel Charles
April 13 - April 20 Raphael Dupre
April 20 - April 27 Michel Garcon
April 27 - May 4 Holly Vance
SVT On-Call
March 8 - March 14 Sho Uemura
March 15 - March 28 Omar Moreno
March 29 - April 4 Pelle Hansson
April 5 - April 8 Omar Moreno
April 9 - April 19 Matt Graham
April 20 - April 26 Tim Nelson
April 27 - May 4 Sho Uemura
SlowControls On-Call
March 1 - March 18 Hovane Egiyan
March 19 - April 1 Stepan Stepanyan




Svtpic.png

Ecalpic.png

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