More Information on intranet page (drawing): LdmWiki:MA09
MA09 Detailed Manual
- on sample stick: x22642
- on VTI heat exchanger: c17844
- common, very rough calibration for all Allen-Bradley test sensors:
| Instrument || Field Limit || Comment|
|TASP ||6 Tesla ||with goniometer, goniometer motors removed, distance to Be filter: > 20 cm|
|TASP ||9 Tesla ||without goniometer unit, monochromator 2theta > 75, distance to Be filter: > 22 cm|
7.9 Tesla: 2theta > 55 ?
|Rita-II ||4 Tesla|
|with goniometer, goniometer motors removed|
|DMC ||1.4 Tesla |
|HRPT ||4 Tesla ||without RC shielding |
|FOCUS ||9 Tesla ||magnetic rail and motor of radial collimator removed|
distance magnet center to mono center 2 m, 2theta < 132 deg or magnet surface to guide surface > 0.9 m
|TriCS ||2 Tesla ||due to problems with omega-encoder (from the forces 4 T is possible)|
|Morpheus ||3.5 Tesla ||with X-Y table, dist. to diaphragmas at least 250 mm, omega motor not in use|
|Morpheus ||2 Tesla ||with omega motor|
The RC shielding (left picture) has to be removed. One of the pieces making trouble is probably the RC motor (right picture).
On all other Instruments, MA09 can not yet be used.
- The magnet has a cold leak, occuring only occasionaly at low temperatures.
As a workaround the main vacuum has to be pumped constantly. (Oct 2006)
- The magnet seemed not to work reliably with the lambda stage
(2 quenches during an expt. on TASP in November 2006). The reason is
not yet clear. A user claimed that the switch heater power is too low
when using the lambda stage. It seems that this is not the case
A test in February 2007 showed no quench up to 9 Tesla. However,
if we extrapolate the force measurements at 5 Tesla, we get forces
near 1000 kN both vertically and horizontally (with shortened distance
sample - mono). At normal distance, the horizontal forces are much lower,
and the vertical forces should be reduced after replacing the A3 motor box.
We now believe that during the quench, the magnet was too close to the
magnetic beam dump of TASP.
- There seem to be a problem with the He level gauge. As a workaround, an
additional gauge is placed in the He filling port. (2005-10-19)
Solved in winter 2006.