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Draft: Rules concerning Superconducting Magnets and Dilution Refrigerator Experiments
Experiments involving superconducting magnets and/or dilution refrigerators
are labor-intensive for the sample environment staff and imply a quite high
risk of problems, especially at the beginning of an experiment. In order to
minimize beam time losses due to ... We therefore
suggest to implement rules for this type of experiments.
Restrictions concerning magnets and/or dilution refrigerator experiments
- On weekends or holidays, is not possible to start magnet or dilution
refrigerator experiments
- Support during weekend or in the evening may not be provided (there is no
sample environment stand-by). If problems occur, it should be tried to
contact the sample environment staff, but not during the night
(10 p.m. - 8 a.m.). In the case that the contact can not be established,
the experiment might have to be suspended until the next working day.
- Aligning the sample with neutrons must be done before the starting day.
Restrictions concerning dilution refrigerator experiments
- On weekends or holidays, sample changes are not possible
- Experiments starting on Fridays (or at a day before a holiday) are only
allowed at the beginning of a beam block, i.e. when the refrigerator
can already be mounted on the instrument the day before.
- The sample must be ready a workday before starting the experiment, except
for the case where the stick is already used immediately before. In this
case the rules for sample changes apply.
- Sample changes take a full working day, i.e. the warming up of the old
sample must start before 8 a.m. Be aware that a delay of a working day
may occur after a sample change.
Dilution Scheduling Policy
Since we have 2 dilution sticks, the number of experiments with this type
of equipment has raised severely. We suggest to implement a limit the number
of dilution experiments by the number of SINQ beam days divided by 7.
This limit is based on an average experiment length of less than 6 days,
and will allow to establish a schedule, where most of the time only
one dilution refrigerator is running at a time.
This particular version was published on 23-Feb-2007 07:12:59 UTC by MarkusZolliker.
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