Difference between revisions of "AP-CEBAF-Optics-2015-02-28"

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** 0L08: [https://logbooks.jlab.org/entry/3322505 zigzags] -> MQB0L07 vertical scan centered near -3600, range +/-500 (BDL -6.71+/-1.0)
 
** 0L08: [https://logbooks.jlab.org/entry/3322505 zigzags] -> MQB0L07 vertical scan centered near -3600, range +/-500 (BDL -6.71+/-1.0)
 
* 1E03 match (E=1057.2 MeV, BDL=5289.659*K1 for L=0.15m magnets):
 
* 1E03 match (E=1057.2 MeV, BDL=5289.659*K1 for L=0.15m magnets):
 +
** 1E03: [https://logbooks.jlab.org/entry/3322505 zigzags] -> MQB1E02 horizontal scan centered near 3100, range +/-700 (BDL 0.586+/-0.133)
 +
** 1E03: [https://logbooks.jlab.org/entry/3322505 zigzags] -> MQB1E01 vertical scan centered near -2900, range +/-1200 (BDL -0.548+/-0.227)
 
* 2E01 match (E=2007.2 MeV, BDL=10042.95*K1 for L=0.15m magnets):
 
* 2E01 match (E=2007.2 MeV, BDL=10042.95*K1 for L=0.15m magnets):
 
* 3E01 match (E=2957.2 MeV, BDL=14796.24*K1 for L=0.15m magnets):
 
* 3E01 match (E=2957.2 MeV, BDL=14796.24*K1 for L=0.15m magnets):

Revision as of 10:04, 28 February 2015

This is a wiki page for references, information, and procedures about Feb 27-Mar 1 work to transversely match CEBAF Twiss parameters at the injector (~0L07), 1E03, and xE01 locations.

Philosophy

The philosophy was developed at a 15:00 meeting in MCC, including Arne Freyberger, Mike Spata, Yves Roblin, Mike TIefenback, Jay Benesch, Todd Satogata, and Operations:

  • use zigzag harp scans to identify quadrupole ranges for good optics/emittance measurements at each harp.
  • modify qsUtility configuration files in the golden area and acquire optics/emittance measurements with traditional qsUtility scans.
  • use qsUtility to analyze the scans and get measured horizontal/vertical Twiss parameters at the start of the respective scan quads.
  • back-propagate measured Twiss parameters to the start of the upstream xS04 quadrupole.
  • use the qsUtility betatron match module (which uses ced2elegant and elegant) to calculate the match, with match point at the harp, using xS04-xS10 quadrupoles for matching to distribute matching effort.
  • evaluate and install the match.
  • re-scan the harp and compare beam sizes to sqrt(emit_meas * beta_design)

Prerequisites at Each Measurement Location

  • 4-8 uA tune beam to first dumplette downstream of match point.
  • quad centering of BPM/quadrupole pairs for qsUtility scan quadrupoles.
  • clean steering in region of measurement and downstream to maximize aperture, minimize beam losses.
  • clean ORFP dispersion in region of measurement and correction. In particular, dispersion in both planes must be consistent with zero at scan quadrupoles and harp.

Procedure

  • confirm harp is working and set harp parameters
  • perform zigzag measurements to establish scan quadrupoles and ranges
  • edit qsUtility configuration files
  • perform qsUtility scans
  • evaluate qsUtility data to get measured Twiss parameters and remittances
  • back-propagate measured Twiss parameters to start of upstream xS04 quadrupole with elegant
    • A script to do this is in ~satogata/backpropagate.pl
  • use qsUtility betatron match module to calculate xS04-xS10 match
  • evaluate and install match
  • re-scan harp and evaluate match effectiveness
  • perform confirmation fopt

Data and References

  • Spring 2015 Optics Spreadsheet
  • 0L injector match (E=107.2 MeV, BDL=536.365*K1 for L=0.15m magnets)
    • 0L07: zigzags -> MQD0L06 horizontal scan centered near 1800, range +/-270 (BDL 3.35+/-0.5)
    • 0L08: zigzags -> MQB0L07 vertical scan centered near -3600, range +/-500 (BDL -6.71+/-1.0)
  • 1E03 match (E=1057.2 MeV, BDL=5289.659*K1 for L=0.15m magnets):
    • 1E03: zigzags -> MQB1E02 horizontal scan centered near 3100, range +/-700 (BDL 0.586+/-0.133)
    • 1E03: zigzags -> MQB1E01 vertical scan centered near -2900, range +/-1200 (BDL -0.548+/-0.227)
  • 2E01 match (E=2007.2 MeV, BDL=10042.95*K1 for L=0.15m magnets):
  • 3E01 match (E=2957.2 MeV, BDL=14796.24*K1 for L=0.15m magnets):
  • 4E01 match (E=3907.2 MeV, BDL=19549.52*K1 for L=0.15m magnets):
  • 5E01 match (E=4857.2 MeV, BDL=24302.81*K1 for L=0.15m magnets):
  • 6E01 match (E=5807.2 MeV, BDL=29056.10*K1 for L=0.15m magnets):
  • 8E01 match (E=7707.2 MeV, BDL=38562.68*K1 for L=0.15m magnets):
  • 9E01 match (E=8657.2 MeV, BDL=43315.97*K1 for L=0.15m magnets):
  • AE01 match (E=9607.2 MeV, BDL=48069.25*K1 for L=0.15m magnets):
  • 5C00 match (E=10557.2 MeV, BDL=52822.54*K1 for L=0.15m magnets):
  • 1C match (E=9607.2 MeV, fifth pass, BDL=48069.25*K1 for L=0.15m magnets):
  • 2C match (E=2007.2 MeV, first pass, BDL=10042.95*K1 for L=0.15m magnets):
  • rayTrace data: 3322485 H 3322488 H 3322490 V