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=HMS optics page=
==Introduction==
* HMS is a Q1-Q2-Q3-D magnet system
* New drift chamber were installed in HMS for 12 GeV. Need to check the 
* HMS delta matrix has not been optimized in the 12 GeV era. Still delta matrix from the 6 GeV era.
* All HMS magnets saturate when magnet is set above 5 GeV.

==HMS optics at low momentum ==

==HMS optics at 6.6 GeV ==
*Fall 2018 take series of optics and elastic runs.
*List of runs at [https://redmine.jlab.org/attachments/548/kaonlt_runlist.csv Kaon Run list].
*Initial set of runs (4734-4741,4768-4773) with Optics 1 target (-10,0,10) and varied dipole and Quads to try and get ytar vs yptar
**Online Conclusion that it was not converging.
*Series of elastic runs with HMS angle changes to move the elastic across the focal plane. all runs at nominal magnet settings.
** Runs 4805-4811 HMS at 18.79deg LH2, Runs 4812-13 DUmmy
** Runs 4816-17   HMS at 17.20 deg Lh2, Runs 4814-15 Dummy
** Runs 4821,24,25 HMS at 19.755deg LH2, Run 4822 Dummy.
** Optic 1 target Run 4819 at 13.005deg.
** Optic 1 target RUn 4820 at 13.005deg (modified Q1 current).
** Single carbon Run 4818 at 13.005deg.

==HMS optics at 6.3 GeV ==
*Fall 2018 take series of optics and elastic runs.
*List of runs at [https://redmine.jlab.org/attachments/548/kaonlt_runlist.csv Kaon Run list].
*Initial set of runs 4756-4757 with HMS dipole at +0.685% above nominal and Q1 + 0.3% with Optics 1 target
*Set of runs 4758-65 with HMS dipole at at +0.685% above nominal and Quads at nominal with Optics 1 target.
*Run 4774 with HMS magnets all at nominal  with Optics 1 target.
*Run 4775 with HMS dipole at 1.002*nominal  with Optics 1 target.
*Run 4776 with HMS dipole at 1.003*nominal  with Optics 1 target.
*Run 5335 with HMS dipole at nominal for 6.358 with Optics 1 target.

==HMS optics at momentum greater than 5 GeV ==
* Initial study of HMS saturation in Spring18
**Looked at the yptar versus ytar correlation at HMS momentum 5.1 to 5.9 GeV
**Fixed the Q1-Q2-Q3 to settings for the given set momentum and then varies the HMS dipole
**[https://logbooks.jlab.org/entry/3554200 Logbook entry] about the measurement.