SHMS Optics Working Group

Weekly Meetings

• Meetings will be held on Thursdays 11:30-12:30 in F228.
• Next meeting March 10th.
• Join by Bluejeans by phone and computer +1.888.240.2560 (US Toll Free) Enter Meeting ID: 653182486

Preparation plans

• Magnets.
  • Determination of B versus I curve. Develop new code for setting SHMS. Revise HMS field setting codes.
  • Cycling procedure especially for HB. Look what is done for the HMS.
  • Double check that the magnet field between magnets are superpositions.
  • Survey of the positioning of magnets.
• Check if it is possible to do carbon elastics at 2 pass. Dipangkar will look into this. (Results for 1 pass- 2.2 GeV, and 2 pass -4.4 GeV)
• Survey of collimators, detectors and beamline components.
• Survey of HMS/SHMS pointing at different angles. Look into what was done in the past for HMS commissioning. Determine a list of angles for survey.
• Need to come up with the sieve pattern as a function of quad settings.
• Need to look at use of ideal dipole versus TOSCA field map for HB in COSY.
• Check with Howard about checking the quad field centering.
• Integration of detector checkout and optics.

SHMS HB mapping

• Document and plots about mapping of B versus I at center of HB bore and the fringe fields in the beam region.
  • B/I versus I plot.
• Measurements of B at bore center versus I when ramping magnet from 0 to +3900 and back to 0. Then switch polarity and ramp from 0 to -3900 and back to zero.
  • plot of absolute difference between B when ramping magnet up and down versus I when going to +3900 and -3900.
  • plot of relative difference between B when ramping magnet up and down versus I when going to +3900 and -3900.
  • Plot of difference in B between ramping up to +3900 and ramping up to -3900 versus current.
  • When ramping to negative currents there was a trip at I= -3139A. Plot of difference between first ramp to -3139A and the second.
• Document and plots about mapping Of B versus z locations for I = 2000, 3000, 3500 and 3900A.

SLITS and COLLIMATORS

• Collimators and Slits for SHMS

SHMS Detector Positions

• Detector_Locations_in_SHMS location

SHMS Characteristics

SHMS Drawings of magnets

• Drawings of SHMS magnets

Study of the SHMS resolution

• Study of the SHMS resolution.

Old HMS information

• HMS Detector survey information,Magnet location surveys
• File with B/I data and plots for dipole and quads.
• Document about dipole field measurements.
• Dipole Transfer Function which compares Tosca and measurements at probe and center.
• Q1 Transfer Function plots and data
• Q2 Transfer Function plots and data
• Q3 Transfer Function plots and data
• Note by Dave Mack on dipole current regulation.
• Plot of Q2 predicted waist versus momentum for effects of zero offset.
• Plots of quads effective field length.
• Plots of quad fringe field.
• Plot X_fp versus momentum.

SNAKE

Moved Snake section here.