Diff: MA7

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JSPWiki v2.0.52


Difference between version 58 and version 2:
Line 1 was replaced by line 1
- !!MA7
+ !!6.8 Tesla Horizontal Field Cryomagnet MA7
Line 3 was replaced by lines 3-8
- !Restrictions
+ 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.
Line 5 was replaced by line 10
- The operation of MA7 on Rita-II is allowed:
+ [MA7/MA7coils.png]
Line 7 was replaced by lines 12-13
- * between 3.0 and 18.0 meV (a2 = 37 deg) at a distance of 450 mm or more, up to 5 Tesla
+ 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.
Line 9 was replaced by lines 15-18
- For any other configuration force tests have to be done.
+ This cryomagnet has strong stray fields due
+ to the size of its coils. Before it may be used on any instrument, force
+ tests have to be done. The specifications allow forces up to 1000 N
+ vertically and 500 N horizontally.
Lines 11-13 were replaced by lines 20-58
- [MA15RitaRestrictions/SampleTableDistance.jpg]\\
- How the distance has to be measured.
- In this example the distance is around 400 mm.
+ [MA7 Specifications]
+
+ More information on intranet page (drawing): [LdmWiki:MA7]
+
+ [MA7 Restrictions]
+
+ [MA7/MA7pict.jpg]
+
+ [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 | 78.7
+ |S02 (max. current) | 96.636 | 100.657
+ |S01 (max. field: second value)| 6.8 | 6.2
+

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