Schematic view of Hall C after the 12 GeV upgrade

Hall C 12GeV Upgrade

Monte Carlo for SHMS

The new SHMS no longer has separate Small Solid Angle (SSA) and Large Solid Angle (LSA) tunes.

The new configuration (spectrometer option=5) consists of:

• a 3 degree horizontal pre-bender
• 2 long HMS Q1-style quadrupoles
• a third quadrupole that shares a common cryostat with ...
• a dipole

Note that we no longer use the combined function magnet.

This configuration gives

• reasonable solid angle (about ~3.5 msr) over the full angular range (5.5 to 25 degrees)
• large momentum bite (-15 to +20%)
• a minimum angle of the SHMS of 5.5 degrees
• a minimum relative angle between the HMS and SHMS of 17.5 degrees

The single arm version of the Monte Carlo is available as a tar-ball at: mc_shms_qd_bender.tar.gz

The updates for SIMC (coincidence Monte Carlo) have been put in the cvs version (simc_semi).

Instructions for downloading: simc_cvs.text

For simulations for PAC30, one should assume that "standard" 4 cm and 15 cm cryotargets will be available. In addition, the maximum current available will be 90 micro-amps.