| Line 20 was replaced by line 20 |
| - !Restrictions on RITA-II |
| + !Asymetric mode |
| Lines 22-23 were replaced by line 22 |
| - Provisional force measuremnents on RITA-II have shown that |
| - the operation of MA7 on Rita-II is allowed: |
| + For changing for symmetric mode to asymmetric and vice versa: |
| Lines 25-91 were replaced by lines 24-31 |
| - * between 3.0 and 18.0 meV (a2 >= 37 deg) at a distance of 450 mm or more, __up to 4 Tesla__ |
| - * between 3.0 and 8.0 meV (a2 >= 56 deg) at a distance of 450 mm or more, __up to 4.4 Tesla__ |
| - * between 3.0 and 8.0 meV (a2 >= 56 deg) at a distance of 540 mm or more, __up to 5.5 Tesla__ (we had a quench at 6 Tesla!) |
| - For any other configuration force tests have to be done. |
| - As soon as the appropriate adapter plate is avaliable, we should |
| - repeat the force measurements. |
| - |
| - [MA7 Original Data] |
| - |
| - [MA15RitaRestrictions/SampleTableDistance.jpg]\\ |
| - How the distance has to be measured. |
| - In this example the distance is around 400 mm. |
| - |
| - !Restrictions on AMOR |
| - |
| - 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. |
| - |
| - !Restrictions on TASP |
| - |
| - ||A2 || distance sample - \\monochromator shielding surface|| Allowed field |
| - |-90 < A2 < -41 (Ei=14.7 meV)|>=122 cm | 3.3 Tesla |
| - |-90 < A2 < -56 (Ei=8 meV)|>=108 cm | 4 Tesla |
| - |-90 < A2 < -82 (Ei=4.1 meV)|>=108 cm | 5 Tesla |
| - |
| - !Restrictions on SANS |
| - |
| - Allowed up to maximum field independend of the field direction. |
| - |
| - Force measurements: |
| - ||field direction || field || horizontal force || vertical force |
| - |parallel to beam | 4.9 Tesla | 80 N | 340 N |
| - |perpendicular to beam | 4.9 Tesla | 110 N | 180 N |
| + * change a cable on the top of the magnet under the aluminium cyclinder |
| + * change the configuration of the IPS, (Test 07): |
| + |
| + ||Parameter || Value for Sym || Value for Asym |
| + |S02 (max. current) | 96.636 | 100.657 |
| + |S01 (max. field: second value)| 6.8 | 6.2 |
| + |S11 (coil inductance) | 112 | 78.7 |
| + |
LIN