TRIM magnets
A TRIM is a small magnet of the dipole type:
 |
A
MDXV Trim magnet
Length = 40 centimetres
Strength BL = 0.77 Tm (52 mm
gap)
Bmax = 17.5 kGauss
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Its purpose is to correct the beam steering. Contrary to a
main bend, its nominal field is exactly zero. Therefore these
magnets are normally short and compact, as the required bending
power is normally small. Like for a bend, its bending angle
theta is given by
theta = 0.2997 • BL / p
where p is the beam momentum in GeV/c and BL the bending
power in Teslameters. Theta is the angle in radians.
In the SL/EA group many different types of trims are in use.
Please find below some data on some of these types:
| Type | Max.BL [Tm] | Length [m] |
Aperture [mm] | Gap width [mm] | Imax [A] |
R (mOhm) | DC/pulsed |
| MDX-52 | 0.77 | 0.40 | 52 | 80 | 250 |
305.0 | DC only |
| MDX-80 | 0.607 | 0.40 | 80 | 80 | 250 |
305.0 | DC only |
| MDX-100 | 0.523 | 0.40 | 100 | 80 | 250 |
305.0 | DC only |
| MDX-108 | 0.494 | 0.40 | 108 | 80 | 250 |
305.0 | DC only |
| MDX-120 | 0.436 | 0.40 | 120 | 80 | 250 |
305.0 | DC only |
| MDS | 0.986 | 0.70 | 70 | 130 | 500 |
162.0 | can be pulsed |
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