Line 1 was replaced by line 1 |
- !Draft: Rules concerning Superconducting Magnets and Dilution Refrigerator Experiments |
+ !Rules concerning Superconducting Magnets and Dilution Refrigerator Experiments |
Removed lines 3-4 |
- |
- |
Lines 7-8 were replaced by lines 5-7 |
- risk of problems, especially at the beginning of an experiment. We therefore |
- suggest to implement rules for this type of experiments. |
+ risk of problems, especially at the beginning of an experiment. In the evening |
+ and on weekends, there is only very limited technical support. In order to |
+ minimize beam time losses, some rules have been established: |
Lines 10-17 were replaced by line 9 |
- ''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. |
+ ''Experiments with superconducting magnets and/or dilution refrigerator experiments'' |
Lines 20-27 were replaced by lines 12-16 |
- ''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. |
+ ''Dilution refrigerator experiments'' |
+ * Sample changes must be done on working days |
+ * The sample must in general be ready (put on/into a suitable holder) |
+ in the morning of a workday before starting |
+ the experiment, except when the stick is already used immediately before. |
Lines 29-43 were replaced by line 18 |
- 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 120 % of the available SINQ |
- beam days. |
- |
- The following table shows the situation for the last and for the next cycle. |
- With such a high number of experiments, it is unavoidable to have periods, |
- where 2 dilution refrigerators run at the same time. This is an highly |
- undesirable situation. |
+ sample must start early in the morning. |
Lines 45-52 were replaced by lines 20-21 |
- |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 * 1.20 |114 |111.6 |
- |overbooking factor | p / l * 100 %|117 %|132 % |
+ See also [Scheduling Policy for Superconducting Magnets and Dilution Refrigerators|MagnetDilutionSchedulingPolicy] (intended mainly for |
+ instrument responsibles) |
Removed lines 54-57 |
- 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 |
- should ideally be done before the proposal deadline in May. |