Difference between revisions of "SHMS Optics Working Group"
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* Check with Howard about checking the quad field centering. | * Check with Howard about checking the quad field centering. | ||
* Integration of detector checkout and optics. | * Integration of detector checkout and optics. | ||
| + | |||
| + | == SHMS HB mapping == | ||
| + | *[https://hallcweb.jlab.org/wiki/images/5/5e/HB_Field_Mapping.pdf Document and plots] about mapping of B versus I at center of HB bore and the fringe fields in the beam region. | ||
| + | *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. | ||
| + | **[https://hallcweb.jlab.org/wiki/images/2/2f/B-versus-I-pos-and-neg-HB-abs-diff.pdf plot ] of absolute difference between B when ramping magnet up and down versus I when going to +3900 and -3900. | ||
| + | **[https://hallcweb.jlab.org/wiki/images/6/64/B-versus-I-pos-and-neg-HB.pdf plot ] of relative difference between B when ramping magnet up and down versus I when going to +3900 and -3900. | ||
| + | **[https://hallcweb.jlab.org/wiki/images/f/f2/Up-versus-down-HB.pdf 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. [https://hallcweb.jlab.org/wiki/images/1/1c/Neg-compare-ramps-HB.pdf Plot] of difference between first | ||
| + | ramp to -3139A and the second. | ||
| + | *[https://hallcweb.jlab.org/wiki/images/e/e0/HB_Field_Mapping-V3.pdf Document and plots] about mapping Of B versus z locations for I = 2000, 3000, 3500 and 3900A. | ||
== SLITS and COLLIMATORS == | == SLITS and COLLIMATORS == | ||
Revision as of 18:34, 9 March 2016
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.
- 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
SHMS Detector Positions
- Detector_Locations_in_SHMS location
SHMS Characteristics
SHMS Drawings of 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.
