Difference between revisions of "SHMS Optics Working Group"

Revision as of 18:35, 9 March 2016

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

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.

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.

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.

Moved Snake section here.

@@ Line 26: / Line 26: @@
 **[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
+**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.
-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.