Skip Ribbon Commands
Skip to main content



SCHEDULING: What do I need to do to get my beam time approved? (What is the timeline for what is due to be submitted when?)

Version HistoryVersion History


What do I need to do to get my beam time approved? (What is the timeline for what is due to be submitted when?)


What do I need to do to get my beam time approved? (What is the timeline for what is due to be submitted when?)


Pre-shift requirements at FACET are:

1) a procedure for the beam time and

2) analyses of previous shifts.


This requirement is for the benefit of our user groups. Good planning leads to better results!


Users must have a written procedure for their beam time that clearly indicates the activity, requirements from the beam and operators and the time that is needed. Guidelines are given (see "how do I write a good procedure" in the FAQ).




Before the run gets scheduled

Coarse outlines including goals, expected analyses and beam and hardware requirements are expected in advance of the run so we can appropriately schedule the experiment. Please send these to the FACET User Manager. The step by step procedure is not required at this point but the sooner it is thought about, the better prepared you will be (it may be that only in thinking step by step, you will realise a missing piece of hardware or forgotten beam requirement).


Two weeks before scheduled beam time

The procedure for your beam time studies needs to be sent to Christine, Vitaly and Mark two weeks prior to the scheduled beam time and then it is expected to undergo reiteration closer to the shift itself.

If a group has multiple shifts or extensive periods for studies, then we don't need all procedures at once and indeed, one shift's experience often influences the procedure for the next shift. Therefore only the procedures for the first shift need to be sent. Note that there may not be much time between shifts so having a prepared draft procedure for


In the week of beam time

The documents will be reviewed and discussed with the experimenters if necessary (and it is usually necessary!). If approved, the operator’s document will be forwarded by Vitaly or a designee to Jerry Yocky who schedules the beam time with the accelerator operations group. This is usually close to beam delivery due to the time it takes to reiterate the procedure.

The procedure will be agreed upon with FACET staff before beam time is handed over to the experiment. Often FACET staff will offer advice or request changes to the procedure which is why we need it in advance.



Day of beam time

Jerry Yocky or designee instructs the accelerator operators on shift on how to set up the beam and check out the hardware as requested in the procedure.


Start of Shift

Just before or at the start of the shift, you are requested to nominate a person in your group to act as the Point of Contact for communicating with Main Control/ the operators. This POC should talk through to procedure with the operator (and sometimes the accelerator physicist) on shift for FACET so the operator has a good sense of how best to support the experiment.

The POC should check with the operator and physicist whether the requirements in the procedure were met. You are encouraged to ask for documentation which should all be posted in the FACET elog. (eg. a plot of the orbit, dispersion etc).


During the Shift

If the procedure changes during the course of the beam time, these deviations should be checked with FACET staff (FACET user manager, division director, science director etc.). This includes if tasks take longer than expected and the agreed upon length of the shift needs to be extended- this can usually be accommodated but will require discussion with facility staff.



After the Shift

Data analysis is expected after the data is collected and before the next data set is obtained. This requires use of calibrated in advance detectors and developing/testing data processing algorithms before run time. This is uniform requirement for all the experiments and excellent practice for science! Taking data blindly without understanding either its quality or its implications is unlikely to yield the best results. Subsequent beam time cannot be given without data analysis of previous beam time.

The procedure for the second shift will be expected after the completion of the first shift (should a second shift be necessary). As above, the procedure will be reviewed and passed to Jerry Yocky for scheduling.
(It is obviously advisable to have the second/third/fourth etc shift procedure prepared in advance and to revise it when lessons are learnt from beam time.)
It is likely that a meeting with Vitaly, Mark and Christine is needed to look at the analysis and plans for the next shift. It certainly makes it quicker to "review" if we meet face to face. If a meeting is not arranged, please contact us (just drop by offices or call cell phones). 



8am the next day (or the next Monday for weekend beam time)

You are expected to send a representative to the 8am meeting in MCC. See here.

It is possible for facility staff to be the representative but you must make this arrangement in advance.



Version: 7.0
Created at 10/1/2013 5:56 PM by Clarke, Christine
Last modified at 9/19/2014 3:08 PM by Clarke, Christine

SLAC SLAC National Accelerator Laboratory, Menlo Park, CA
Operated by Stanford University for the U.S. Dept. of Energy