| Lines 43-78 were replaced by line 43 |
| - Provisional force measuremnents on AMOR have shown that |
| - the operation of MA7 on AMOR is allowed with a field perpendicular |
| - to the beam at least __up to 4 Tesla__. |
| - The distance to the shielding wall between AMOR and SANS-II has |
| - to be at least 540 mm, measured from the aluminium window |
| - (or about 870 mm to the magnet centre). |
| - |
| - ''Torque Calculations'' |
| - |
| - 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 (870 * 6/5 = 1044 mm). |
| - |
| - Measured force at 3.4 Tesla: 180 N.\\ |
| - Extrapolated to 5 Tesla: 390 N.\\ |
| - Factor 1.2 for including torque: 470 N.\\ |
| - With a reasonable security margin, we allow to go __up to 4 Tesla__. |
| + Force tests after major instrument upgrade 2023-11-21: |
| Line 80 was replaced by line 45 |
| - Force tests repeat after major instrument upgrade: |
| + Allowed field when perpendicular to beam: __6.8 Tesla__ (forces 300 N horizontally, 480 N vertically) |
| Removed lines 82-83 |
| - Allowed field when filed is perpendicular to beam: __6.8 Tesla__ (forces 300 N horizontally, 480 N vertically) |
| - |
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