Meetings

SHMS Characteristics

Drawings of magnets:
- [Side view drawing ] of the SHMS Q3 and Dipole with distances. The far left cross hair in the drawing is the x_hut=y_hut=z_hut=0 point from which the detector positions are measured in the hut. The distance from the dipole center to the "zero" point projected perpendicular to the mechanical center axis of the dipole is 3.72m. [Plot] of detector distances from the "zero" point. (From Mike Fowler on Sept 12th, 2011)
- [Drawing ] with measurements of the dipole entrance flange. [3d picture ] of the dipole entrance.
[Summary table ] of the SHMS magnets field properties. From Steve Lassiter file magnet_summary.doc on Sept 9th 2011.
Horizontal bender magnet dimensions (Mike Fowler on Sept 12th, 2011): [Top view] , [3-D view], a few more views of the H bender from 2010, top view, top view at the smallest spectrometer angle, front face view, side view, side sectional view, top sectional view, view of aperture

The Horizontal Bender
- The integral field needed for 3 deg bend is 1.9211 Tm.
- From map file, MSU_Bender.map, the maximum integral field along a straight path is 1.92929 Tm with B_max=2.4768 T giving L_eff= 0.7789m. So need a factor of 0.996 to scale map toget field for 3deg bend.
Dipole
- The integral field needed for 18.4 deg bend is 11.783 Tm for integration along the path of the particle, L_arc, which is incident perpendicular to the field. The difference between the L_arc and the straight line L_eff is L_arc/L_eff = theta/sin(theta)=1.017 for theta=18.4 deg. So need integral field along a straight path of 11.586 Tm.
- From map file, shmsD2008.map, B_max=4.7907 and Int(Bdl) = -13.67883 so L_eff=2.855. So need a factor of 0.8478 to scale map to get field for 18.4 deg bend.

Ran SNAKE with set of random trajectories for point target with -0.055 < xptar < 0.055, -0.030 < yptar < 0.040 and 8.8 < momentum < 13.2 GeV/c.
Input deck to SNAKE has 26 endplanes. An endplane is a position within SHMS where the the positions and angles are recorded. If the track goes outside the SHMS good volume then a flag is set to indicate a failed track and the positions and angles at the location between the endplanes is recorded.
Compared an vertical offset of 20cm and 26cm. For each offset the distance between the centerof the dipole and the focal plane center is recalculated.
- 1D Plot of number of tracks which failed for each endplane number for offset of [20cm] and [26cm] . Endplane 6 is HB physical exit. Endplane 10 is Q1 physical exit. Endplane 19 is Dipole physical entrance. Endplane 23 is Dipole physical exit.
- 1D Plots of target xp,yp, delta and solid angle vs delta with for offset of [20cm] and [26cm] . The black line is all tracks. The blue line is failed tracks. The red line is passed tracks. The solid angle is calcualted by the ratio of passed tracks to total tracks mutliplied by 0.11*0.07*1000 (the thrown solid angle in msr at each delta).
- 2D Plots of target xp/delta, yp/delta and xp/yp for offset of [20cm] and [26cm] .
- 2D Plots of focal plane x/y, xp/yp, yp/y and xp/x for offset of [20cm] and [26cm] .