12 GeV HMS Optics Data

HMS optics page

Introduction

• HMS is a Q1-Q2-Q3-D magnet system
• New drift chamber were installed in HMS for 12 GeV.
• 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 above 5.5 GeV/c

Run Number	Beam Energy (GeV)	HMS Central Momentum (GeV/c)	HMS Angle (Deg)	Collimator Type	Target	Delta (%)	Comment
4819	10.5965	6.59	-13.005	Sieve Slit	-10, 0, +10 cm Carbon Foil	N/A	6.6 GeV/c Carbon-Sieve Data
4805	10.5965	6.59	-18.8	Large	LH2	0.34	6.6 GeV/c Delta Scan Data; NMR Readback = 1.84204 T
4806	10.5965	6.59	-18.8	Large	LH2	0.34	6.6 GeV/c Delta Scan Data; NMR Readback = 1.84204 T
4808	10.5965	6.59	-18.8	Large	LH2	0.34	6.6 GeV/c Delta Scan Data; NMR Readback = 1.83462 T

HMS optics at 6.6 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.
• Series of SHMS (proton) and HMS (electron) ep coincidence
  • SHMS p = +4.840 ang = 26.147 HMS p = -6.590 ang = 18.845
  • Runs 4855-4860,4862-4963 LH2
  • run 4864 dummy
• Series of optics 1 with Sieve runs
  • 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 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
  • Logbook entry about the measurement.