Revision as of 12:39, 21 July 2020

HMS optics page

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.

Fall 2018 take series of optics and elastic runs.
List of runs at 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.

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
- Logbook entry about the measurement.

@@ Line 17: / Line 17: @@
 ** 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.
+** Optic 1 target Run 4819 at 13.005deg.
-** Optic 1 target RUn 4820 ( modified Q1 current).
+** Optic 1 target RUn 4820 at 13.005deg (modified Q1 current).
-** Single carbon Run 4818.
+** Single carbon Run 4818 at 13.005deg.
 ==HMS optics at momentum greater than 5 GeV ==