The superconducting magnet MA15 was acquired in 2004. It was paid
14.9 Tesla is the maximum field achievable with nowadays technology
for a split pair coil (which is needed for wide angle access). This
limit could in principle be increased to 17.5 by means of a dysprosium
insert for small samples. This option is not (yet) available at SINQ.
A rotatable sample stick has been made at PSI using a similar design at the
ILL. This allows to leave the magnet in a fixed omega position and to
turn the sample orientation within the magnet.
after several quenches, operation above 12.5 without lambda stage is not recommended see
Due to force limits, restrictions are defined for the use of MA15.
On all other instruments, MA15 can not yet be used.
Specifications / Ramp Limits
More information on intranet page (Drawing): LdmWiki:MA15
Omega Motor Change on Rita2
- The automatic needle valve does not always work properly.
A mechanical problem was solved by Oxford Instruments.
It is still a problem that sometimes the needle valve bar
gets frozen. This problem might be avoided when keeping warm
the top of the needle valve during fill. However, at high
fields, the air dryer might not work!
- The nitrogen level gauge does not work. This has to be fixed, but
it seems that it may appear often.
- During He-fill, LN2 has to be filled again in order to avoid
air sucking into the LN2 dewar.
- In order to be used possibly on other instruments, the instruments have to be
checked for magnetic materials around the sample table. After some force
tests, and after eventual modifications of the instrument, the conditions
for a safe operations have to be defined. The next candidate for these
tests is TASP.
This page last changed on 06-Sep-2021 07:26:14 UTC by MarkusZolliker.