
General Program Advisory Committee (G-PAC)
The General PAC is an international program advisory committee of GSI and FAIR with external experts as members. The General PAC gives advice to the Directorate on selecting experiment proposals that are submitted by individual users or user groups in the areas of nuclear and atomic physics, currently for the FAIR Phase-0 program. Following periodic calls for proposals, the General PAC meets to evaluate those experiment proposals on the basis of scientific merit and with regard to the GSI/FAIR strategy, and advises the GSI/FAIR Scientific Director on the amount of beamtime to be approved.. The G-PAC also acts as umbrella for the different sub-PACs of GSI/FAIR for various research fields.
Call for proposals for experiments at CRYRING in 'standalone' mode in 2026
The GSI/FAIR Scientific Management is issuing a call for beamtime proposals regarding physics within FAIR Phase-0 at the CRYRING in standalone mode, i.e. with use of internal ion sources only. This beamtime is foreseen for a period between October 2026 and March 2027, with an expected total of around 120 shifts of 8 hours each.
For CRYRING standalone operation, instrumentation and machine performance on a similar level as in 2025 can be expected, i.e. ion beams will be injected still from the existing 10-GHz ECR ion source. To guide the proposers with expectation values, an overview table of beam parameters from past beam times is given at
Proposals are invited for submission via the GATE system starting October 1st, 2025 with the deadline on February 1st, 2026. Please contact the PAC Scientific Secretary (Dr. Manuel Vogel) to obtain specific access. Submitted proposals will then be evaluated by an external board of experts, results are expected by March 2026. The guidelines for proposals are identical to those for the G-PAC and can be found on
https://www.gsi.de/g-proposal_structure
please take note of the six-page limit! Future regular calls for beamtime at CRYRING in standalone mode for later in 2027 and beyond are planned on a yearly basis.
Please note: Participants with Russian or Belarussian affiliation are currently exempt from proposing and participating in experiments at GSI/FAIR.
Proposals can be submitted electronically via GATE.
'Call for Proposals' are sent to users registered in GATE, to the users' mailinglist, and published on this webpage. For registering to the users' mailinglist please see the Users Webpage.
Information on applications and scheduling of beamtime is given under the websites: Applying for Beamtime, respectively Scheduling. General information on beamtime can be found here.
For information on submission of proposals see: Procedure to Apply for Beamtime.
For proposal and user management we use the platform GATE: General Access Tool to the Experimental facilities of GSI / FAIR (GATE).
Registration to GATE under: https://gate.gsi.de.
GATE Short Manual for Users: here
Registration in GATE is possible independant of an open 'Call' at any time and registered users will be informed on new 'Calls'. So it is advisable for interested users to register any time.
All (!) users, i.e. participants of a proposal and experimentalists coming on-site for the experiment need to be registered in GATE (and allow being visible for other users' search in GATE).
During proposal submission the Proposer is explicitly asked to indicate host lab resources required for the proposed experiment additional to beamtime requests. Related to preparations for FAIR, technical and infrastructure departments often have very tight time schedules and need to plan carefully with respect to time and manpower. In order to offer the best possible service enabling the experiments to be set up and run in an optimal way, we need to know all requirements to us as host lab in advance.
In the webform you are asked to mark whether and which resources you will need, incl. further specifications on this request. This will allow the involved departments to confirm the feasibility. Together with your local contact person, you can restrict your information there to a minimum and best guesses from experience or after consulting the department involved. In case of doubts, the respective department will come back to you with further questions before confirming feasibility of your experiment.
While this information in the proposal serves as rough information only, when planning the execution of your experiment you need to contact the respective host department directly and with concrete details on your requirements.
We absolutely want to avoid the situation in which after evaluation and granting we discover, that the proponents had expected service of GSI, which cannot be delivered (at the required time/in that detail or volume) and thus a granted experiment cannot run.
A Research Data Management Plan (RDMP) is currently not mandatory, but users are asked to plan ahead of time how to take, manage, process and store their data, and think about its possible later publication. This also helps in formulating a request for host lab resources, e.g. IT support, if required. For more information see this document.
Experiments with granted beamtime (i.e. ranked A) are listed in this table. It contains experiments in the status after granting and before completion/expiry, and gives number of granted shifts.
Experiments in the reserve list have been ranked A- due to large overdraft of beamtime. They might be scheduled if beamtime becomes available.
Data are updated before and after a beamtime block.
Further information on application and scheduling of beam time is given under the websites Applying for Beamtime and Scheduling, respectively. General information on beam time can be found here.
Members of the G-PAC
- Eberhard Widmann (Chair)
Stefan Meyer Institute for Subatomic Physics, Vienna, Austria
- Toshiyuki Azuma
Riken, Japan
- Jana Bielcikova
Nuclear Physics Institute of the CAS, Czech Republic
- Yorick Blumenfeld
IPN Orsay, France
- Philippe Crochet
LPC, Clermont-Ferrand, France
- Paul Greenlees
University of Jyväskylä, Finland
- Magda Kowalska
CERN, Switzerland
- Witold Nazarewicz
FRIB/MSU, USA
- Marek Pajek
Jan Kochanowski University, Kielce, Poland
- Marina Petri
University of York, UK
- Thomas Pfeifer
Max-Planck-Institute for Nuclear Physics, Heidelberg, Germany
- Achim Schwenk
Technical University Darmstadt, Germany
- Tomohiro Uesaka
RIKEN, Japan
G-PAC Scientific Secretaries
Presently, there is no meeting of the committee planned, nor is there any open 'Call for Beamtime Proposals'.
Users registered in GATE indicating their interest in our facilities will be informed on new calls.
Previous G-PAC meetings: |
meeting # | date | meeting web page |
46 | 18-20 February 2025 | https://indico.gsi.de/event/21211/ |
45 | 28-30 September 2022 | |
44 | 26-28 August 2020 | https://indico.gsi.de/event/10142/ |
43 | 19-21 September 2017 | https://indico.gsi.de/event/6300/ |
41 | 17 April 2015 | https://indico.gsi.de/event/3524/ |
40 | 23-24 November 2011 | |
39 | 2-3 November 2010 | https://indico.gsi.de/event/1458/ |
38 | 20-21 April 2010 | https://indico.gsi.de/event/1802/ |
37 | 20-21 October 2009 |