Cryebis Operations Policies

Policies and information about running the JRM Cryebis.

Cryebis Beams

The KSU-CRYEBIS, a CRYogenic Electron Beam Ion Source, is a unique research tool in the J.R. Macdonald Laboratory (JRML). The KSU-CRYEBIS can deliver the following ion beams:

Cryebis Capabilities
Available Species:	H, He, C, N, O, F, Ne, Al, Si, S, Cl, Ar	Fe, Co, Kr	Xe	Ta	U
Max Charge State:	Bare Ions	He-Like	47⁺	52⁺	64⁺
Max Currents:	nA to pA range
Final Ion Energy/Charge:	120 V - 150 kV

Scheduling

To schedule beamtime you may contact the Associate Lab Director:

Kevin Carnes
29 Cardwell Hall
Kansas State University
Manhattan, KS 66506-2604, USA
Voice: 785-53-2662
Fax: 785-532-6806
E-mail: kdc@phys.ksu.edu

When scheduling beam time one needs to realize that there are no full time operators available and therefore one should plan on ample time for the CRYEBIS to be tuned to the desired charge state and for the ion beam transport to be tuned to the desired target station. The operation of the KSU-CRYEBIS is in principle simple ¹, more specific details are given in the "CRYEBIS Manual". The ion beam transport is highly flexible, allowing a broad range of final ion energies to be delivered to target stations at ground potential. More specific details are given in the "CRYEBIS User Manual". However, both CRYEBIS manuals are neither complete nor always up to date as the KSU-CRYEBIS is a one-of-a- kind research tool which is continuously evolving. All changes and new developments are presented and discussed in the JRML "Nuts & Bolts" meeting, normally held every Monday 1:30-2:30 pm in Cardwell 119. An "Introduction to the Operation of the KSU-CRYEBIS" with supervised hands-on training is held once a year in June.

The KSU-CRYEBIS facility is maintained by the KSU-CRYEBIS scientist (Charles Fehrenbach), assisted by one graduate student, who refills cryogens as needed. As time and schedule permit, the engineer is available to support users with setting up beam lines, tuning the KSU-CRYEBIS, and/or tuning the ion beam transport. For users not familiar with all aspects of the facility, it is important to schedule their beam time in a way which synchronizes the timing of most of their needs for support with the working hours of our staff. Experience over the last 7 years has shown that the best support can be provided for beam times starting and ending on Monday. This has substantially increased the success and productivity of the past beam times. In order to maximize the productivity of most users, as well as the use of the facility, the following guidelines are used for scheduling:

Scheduling full weeks (Monday afternoon through Monday morning), obtains the highest priority, even if split among different users. Users signing up for other starting days and ending days risk a cancellation of their allotted time when another user wants to sign up for a full week.
Outside users and experiments with outside participation have priority (according to the number of outside participants and the distance they need to travel) as they need flexibility to arrange their travel.

Operations

In the absence of full time operators available 24 hours a day, the users may operate the KSU-CRYEBIS when needed. Participation in a hands-on training session is strongly recommended. When failures occur the staff will try to restore operation as time and schedule permit. Users may also identify failures and restore operations. Beam time lost due to system failures will be rescheduled if time remains available. If the failure is caused by a user action or inappropriate use, the beam time lost, including beam time lost by subsequent users, may be subtracted from the awarded beam time, including future awards, if applicable.

Reference:

¹ "The Operation of Electron Beam Ion Sources for Atomic Physics", Martin P. Stöckli,
"Accelerator-Based Atomic Physics Techniques and Applications",
S. Shafroth and J. Austin, edts.,
(American Institute of Physics, Woodbury, New York, 1997), pg. 67-116.