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(Short Term Schedule)
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==<font color=red size=+2>Acceptable Beam Conditions:</font>==
 
==<font color=red size=+2>Acceptable Beam Conditions:</font>==
 
<font color=blue>
 
<font color=blue>
<b> Before accepting beam, make sure all the conditions are met - beam profile and halo rates are what you expect (or very close to it). If unsure call to RC, PDL, or beamline expert! </b>
+
<b> To establish good beam conditions first send beam to the tagger dump (ask MCC to turn ON the tagger).</b>
 +
# Check position, it should corresponds to previous good settings [https://logbooks.jlab.org/entry/3334787]
 +
# Check profile, it should correspond to previous good harp scans (https://logbooks.jlab.org/entry/3334749],[https://logbooks.jlab.org/entry/3334751])
 +
Before accepting beam, make sure all the conditions are met - beam profile and halo rates are what you expect (or very close to it). If unsure call to RC, PDL, or beamline expert! </b>
 
* Beam optics setting is such that at 2H02A harp the beam profile will be as requested by HPS,[https://logbooks.jlab.org/entry/3326814  wide in X-direction and narrow in Y].
 
* Beam optics setting is such that at 2H02A harp the beam profile will be as requested by HPS,[https://logbooks.jlab.org/entry/3326814  wide in X-direction and narrow in Y].
 
* This optics setting will make the beam profile at 2C21 harp narrow in [https://logbooks.jlab.org/entry/3326718 both directions], while profile on the "tagger" or 2C24 harp wide in [https://logbooks.jlab.org/entry/3326720 both directions].
 
* This optics setting will make the beam profile at 2C21 harp narrow in [https://logbooks.jlab.org/entry/3326718 both directions], while profile on the "tagger" or 2C24 harp wide in [https://logbooks.jlab.org/entry/3326720 both directions].

Revision as of 14:32, 25 April 2015


[edit]

RC: Raphael Dupre

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

PDL: Stepan Stepanyan

Every Shift:

  1. Follow run plan as outlined by RC
  2. Ask MCC if orbit locks are on, they should be.
  3. Keep shift summary up-to-date in HBLOG. Record all that happens.
    • Check on white board all scalers that need to be logged regularly
    • Document any beam condition change and send scaler GUIs to HBLOG
  4. Update the run table on Google Docs.
  5. Peform 2H02A harp scan once per shift or when beam conditions have changed, based on beam monitors (BPMs, halo rates, beam-viewer)
  6. With any issue contact On-Call Experts or RC.

SVT Instructions

Before sending beam to Faraday cup, verify (and page SVT 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.


Acceptable Beam Conditions:

To establish good beam conditions first send beam to the tagger dump (ask MCC to turn ON the tagger).

  1. Check position, it should corresponds to previous good settings [1]
  2. Check profile, it should correspond to previous good harp scans (https://logbooks.jlab.org/entry/3334749],[2])

Before accepting beam, make sure all the conditions are met - beam profile and halo rates are what you expect (or very close to it). If unsure call to RC, PDL, or beamline expert! </b>

  • Beam optics setting is such that at 2H02A harp the beam profile will be as requested by HPS,wide in X-direction and narrow in Y.
  • This optics setting will make the beam profile at 2C21 harp narrow in both directions, while profile on the "tagger" or 2C24 harp wide in both directions.
  • The halo counter rates before HPS must be low:
    • UPS-L and UPS-R few Hz/nA,
    • if tagger magnet is energized TAG-L/T/T2 ~10Hz/nA [3],
    • if beam is going to Faraday cup dump then tagger counters and downstream counters should count <<1 Hz/nA
  • The halo counter rates on HPS, HPS-L/R/T/SC, depends on the collimator and HPS chicane settings, but should not be more than 100 Hz/nA[4]
  • As halo counters, positions on BPMs and the settings of correctors also must be close to what where before.

Always read previous log entries, compare settings of BPMs and correctors with previous settings using scaler_hps GUI.

Every Run:

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


MCC Daily Meetings



Run Plan: April 17-22, 2015 (day/swing/owl)

During week days, Mon-Thursday, there will be no Day shifts due to work in the hall. Friday day shift may happen (slim probability), so be prepared. Monday Swing shift will recover after significant amounts of accelerator work, so a full tune up of the Hall-B beamline will be required.

Short Term Schedule: Study Trigger and SVT running conditions.

We will be running with 1.05GeV beam. This beam needs to be carefully restored, first to the tagger dump, then the alcove and Faraday cup screen. Before sending beam to the alcove, call the RC.

  1. MCC re-tunes upstream beam into the tagger dump. See acceptable beam documentation before moving on;
  2. When beams are acceptable, MCC restores beams to alcove; This requires a degauss of the tagger magnet (takes a while!)
    1. Notify RC.
    2. SVT must be open, collimator must be in.
  3. BPMs were "rough" calibrated. Check old settings, but remember there is likely still a current dependence on the stripline BPMs.
  4. Require good spot on Chromax, low counts on halo counters, have MCC turn on orbit locks if current is stable and above 15 nA, and then set-up chicane.
    1. Note: If you change beam current current, turn orbit locks off first, there is a current - position dependence on the stripline BPMs 2H00 and 2H02.
  5. Make sure the beam is well centered in Y and goes through the center of the HPS collimator.
  6. Call SVT expert. Expert will check conditions and turn on SVT.
  7. Take data with SVT open and check the SVT timing.
  8. Take data. Subsystem commissioning studies: more trigger commissioning studies, beam trip studies once orbit locks are on.
  9. Check if tracking works!

When we're back, proceed with program

  1. Document all your work in the logbook! Please!

MCC works on beam optics and matching, and tunes beam to tagger

  • After MCC finishes beam tune and upstream bpms are calibrated
    • record harp scans at 2C21 and 2C24. These must be good scans, good S/N, no tails, and low halo count rates before proceeding.

Standards are on this page: ACCEPTABLE BEAM CONDITIONS.

    • make sure no bleedthrough-- counts when no beam?
    • After beam tune is done send HPS scaler GUI to the logbook with comments

Restore Beam to the Hall-B Dump

  • Ask MCC to turn OFF the beam.
  • Turn off tagger magnet and change beam configuration to "bta" GUI to "Electron"
  • Have MCC degauss magnet
  • Make sure target is out
  • Insert Chromax screen on the downstream viewer
  • 4mm SVT Protection collimator in place
  • Restore 1 nA CW beam and have MCC bring beam to y~-5mm; x~5mm on the Chromax screen. (distance between dots=5mm). Record spot. Record scalers. Repeat and record 2C21 and 2C24 harp scans and corrector settings. We need these for next time!
  • Record position at 2H02 harp. Repeat at 10 nA. Must have good spots, nominal sizes, no tail to proceed. Position ok?
  • record scalers and beam location on screen.
  • establish orbit locks

Energize Chicane

  • follow standard procedures in Beamline manuals for procedures and settings. Use table for 1 GeV beam!
  • beam spot on Chromax should be unmoved. If not, tune Frascati slightly. See caution below.

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

  • Turn beam off and insert HPS target, 4um W. Restore beam. Check count rates.
  • 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. Return to nominal beam position.
  • Do vertical scan of target at nominal beam position. Measure halo counter/ecal rates vs target position. Record data and graph.

Are we centered? Beamline Expert should enter new target positions if not.

  • Do scan of SVT collimator, measuring counter rates vs SVT collimator position with nominal beam position.
  • If Omar and beamline expert are available during day or swing, do SVT Wire Scan. This still needs an expert. Orbit locks must be temporarily removed to move beam horizontally with upstream correctors, if needed. Restore orbit locks when done.

Subsystem Commissioning Studies. Begin Data Taking.

DO NOT RUN MORE THAN 30 MINUTES ABOVE 50 nA WITHOUT THE BEAM BLOCKER
PUT BEAM BLOCKER IN FOR LONG RUNNING AT HIGH CURRENT

  • Make sure DAQ is OK for data taking
  • More Trigger commissioning data runs. See Valery's note on the run Wiki under commissioning trigger.
  • If orbit locks are on, call Rafayel for beam trip study. Take 4 hours of beam trip data with wire up; take 4 hours of beam trip data with wire down.
  • Absent other requests, take data at 50 nA. Be sure to block Faraday cup if higher current.


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




Trigger
FADC GTP
NSB/NSA 20/100 ns Samples Before/After 3/3
Readout Threshold 12 ADC Seed Threshold 80 MeV
SSP
Singles-0 Singles-1
# Hits >2 >2
Cluster Energy 0.1 < E < 2.5 GeV 0.5 < E < 1.2 GeV
Pairs-0 Pairs-1
Cluster Energy 0.09 < E < 1.3 GeV 0.1 < E < 0.6 GeV
Energy Sum 0.19 GeV < E < 2.2 GeV 0.21 < E < 1.0 GeV
Energy Difference dE < 1.2 GeV dE < 0.65 GeV
Coplanarity N/A Theta < 40 deg
Energy Slope N/A > 0.6 GeV
TI Prescales
Singles-0 Singles-1 Pairs-0 Pairs-1
0 0 0 0


Long Term Schedule Proposal PowerPoint

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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
Stepan Stepanyan
Beamline On-Call
Takashi Maruyama
May 5 - May 11 Francios-Xavier Girod
May 12 - May 19 Stepan Stepanyan
DAQ On-Call
NOW 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 Hovanes Egiyan
March 19 - April 1 Stepan Stepanyan
April 22 - April 29 Bryan McKinnon
April 30 - May 4 Sho Uemura
May 5 - May 19 Nerses Gevorgyan




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