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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. 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 for
dilution experiments: The total number of dilution days plus 3 times the
number of experiments should not exceed 125 % of the available SINQ
beam days.
Period | | Aug-Dez 2006 | Apr-Aug 2007 |
SINQ beam days | s | 95 | 93 |
number of dilution expts. | n | 15 | 17 |
total dilution usage [days] | d | 88 | 96 |
dil1 & dil2 running simultaously [days] | | 15 | 35 |
points used/planned | p = n * 3 + d | 133 | 147 |
points limit | l = s * 1.25 | 119 | 116 |
overbooking factor | p / l * 100 % | 112 % | 127 % |
As the schedule for the next period is already done, we try to handle
the large number of experiments as well as possible. But for the next
cycle (Sept-Dec 2007) we want to agree about a scheduling policy.
This particular version was published on 21-Feb-2007 13:29:31 UTC by MarkusZolliker.
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