| At line 20 added 6 lines. |
| + Original data: |
| + ||a2 [[deg] || distance [[mm] ||field [[Tesla] || force [[N] |
| + | 56 | 540 | 4.8 | 230 |
| + | 56 | 450 | 3.4 | 180 |
| + | 37 | 450 | 3.4 | 220 |
| + |
| Line 29 was replaced by line 35 |
| - to the beam up to 5 Tesla. The distance to the shielding |
| + to the beam at least up to 4 Tesla. The distance to the shielding |
| Removed lines 32-34 |
| - As the force is proportional to B^2/r^7, reducing this distance |
| - by 50 mm may lower the maximum allowed field to about 4 Tesla! |
| - |
| At line 35 added 1 line. |
| + ''Torque Calculations'' |
| At line 36 added 23 lines. |
| + In general, the forces are not only radial, but also tangential, |
| + inducing a torque onto the magnet. For estimating the forces |
| + on the fixation, we need to take into account the distance of |
| + the fixation points from the coil center. |
| + |
| + For MA7, with a mean coil radius of about 100 m and fixation points |
| + at about 150 mm for the coil center, we get the following: |
| + |
| + Ro: object distance (mm)\\ |
| + phi: angle (deg) between field direction and direction of object, for maximum force on fixation\\ |
| + Fp: force when object on magnet axis (in field direction) |
| + Ft: maximum total force on fixation |
| + |
| + ||Ro ||phi ||Ft / Fp |
| + |<600 | 0 | 1.0 |
| + | 800 | 20 | 1.04 |
| + | 1000 | 27 | 1.13 |
| + | 1200 | 32 | 1.25 |
| + |
| + For the distance to the shielding wall we have to add 1/5 of the edge |
| + distance for the mean distance of the material that has to be taken |
| + into account. |
| + We |
LIN