| Line 1 was replaced by line 1 |
| - !!MA7 |
| + !!6.8 Tesla Horizontal Field Cryomagnet MA7 |
| Line 3 was replaced by lines 3-15 |
| - This new 6.8 Tesla horizontal field cryomagnet has strong stray fields due |
| + The horizontal high field cryomagnet has a restricted neutron access. |
| + There are 4 windows of 45 deg each, valid for a sample of 15 mm diameter. |
| + For larger samples, the opening angle for full access is sligthly smaller. |
| + In the field direction, the vertical access is +- 22.5, in fact, the access |
| + is a cone. Perpendicular to the field direction, the access is +-6.7 deg on |
| + a 15 mm sample, or 65 mm parallel access. |
| + |
| + [MA7/MA7coils.png] |
| + |
| + For access with polarized neutrons, an asymmetric mode (max. 6.2 Tesla) |
| + is available. This is needed when a beam perpendicular to the field is used. |
| + |
| + This cryomagnet has strong stray fields due |
| Line 8 was replaced by lines 20-24 |
| - !Restrictions |
| + [MA7 Specifications] |
| + |
| + More information on intranet page (drawing): [LdmWiki:MA7] |
| + |
| + [MA7 Restrictions] |
| Lines 10-11 were replaced by line 26 |
| - Provisional force measuremnents on RITA-II have shown that |
| - the operation of MA7 on Rita-II is allowed: |
| + [MA7/MA7pict.jpg] |
| Lines 13-23 were replaced by lines 28-58 |
| - * between 3.0 and 18.0 meV (a2 >= 37 deg) at a distance of 450 mm or more, up to 5 Tesla |
| - * between 3.0 and 8.0 meV (a2 >= 56 deg) at a distance of 450 mm or more, up to 5.5 Tesla |
| - * between 3.0 and 8.0 meV (a2 >= 56 deg) at a distance of 540 mm or more, up to 6.8 Tesla |
| - |
| - For any other configuration force tests have to be done. |
| - __Anyway, these measurments should be confirmed when an |
| - approriate adapter plate is avaliable.__ |
| - |
| - [MA15RitaRestrictions/SampleTableDistance.jpg]\\ |
| - How the distance has to be measured. |
| - In this example the distance is around 400 mm. |
| + [MA7/asysym.jpg] |
| + !Asymetric mode |
| + |
| + For changing from symmetric mode to asymmetric mode and vice versa: |
| + |
| + * on the top of the magnet under the aluminium cyclinder: |
| + ** make sure that the magnetic field is zero (IPS: shown current is 0 AND "persistent mode" LED is off) |
| + ** switch the magnet power supply IPS off |
| + ** open the cap using the screws marked on the picture above |
| + ** switch the cable from the SYM pin to ASY pin (or vice versa) |
| + ** the cable connected to the COM pin must always stay connected |
| + ** close the cap |
| + ** switch the magnet power supply on |
| + * change the configuration of the IPS: |
| + ** press RAISE+LOWER+LOC/REM simultanously ("tESt" and "t 00" appears) |
| + ** press LOWER to go to "t 07", and then LOC/REM (""SUP" and "S 00" appears) |
| + ** press LOWER 5 times to go to "S 11" and then press LOC/REM (the induction value appears) |
| + ** press and hold LOC/REM and change the value with RAISE or LOWER, release LOC/REM when done |
| + ** press RAISE 7 times to go to "S 02" and then press LOC/REM (the value for max. current appears) |
| + ** press and hold LOC/REM and change the value with RAISE or LOWER, release LOC/REM when done |
| + ** press LOWER once to go to "S 01" and then press LOC/REM (the value for max. current appears) |
| + ** press LOC/REM again (the value for max. field appears) |
| + ** press and hold LOC/REM and change the value with RAISE or LOWER, release LOC/REM when done |
| + ** press LOWER once to go to "S 00" and then press LOC/REM ("tESt" and "t 00" appears) |
| + ** press LOC/REM again ("Stor.y" appears) and again |
| + |
| + ||Parameter || Value for Sym || Value for Asym |
| + |S11 (coil inductance) | 112 | 78.8 |
| + |S02 (max. current) | 96.636 | 100.657 |
| + |S01 (max. field: second value)| 6.8 | 6.2 |
| + |
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