(update June 24, 2026)

Due to a fire on February 5, 2026, caused by a technical defect in the area of the high-voltage electrical power supply system of the UNILAC, beamtime 2026/27 cannot run as planned. In 2026 only Cryring in standalone mode and the PHELIX laser have regular user operation, while no experiments can be done at the UNILAC-dependent facilities UNILAC, SIS18, FRS, ESR, HITRAP.

The following intermediate solutions for beam operation have been positively assessed by GSI/FAIR's Joint Scientific Council (JSC) and the Machine Advisory Committee (MAC), and are being pursued: 

Short term (from Q4/2027 onwards): Start FAIR commissioning / limited user operation

• beam with light ions (up to carbon) at low intensities (e.g. PARTIH/HITRAP in transfer channel to SIS18)
• main focus is on technical commissioning w/ beam of FAIR transport lines (HEBT) and Super-FRS; beam parameters will be sufficient for detector tests and individual experiments, but not for a competitive user beamtime.
• science opportunities at SIS18 (not in Experimental Hall, EH)

Mid term (starting 2028): Interim science program

• beam up to medium-heavy ions (up to Xe) at medium intensity (HLI-like InterLAC)
• focus on SIS100 commissioning and Super-FRS, CBM, NUSTAR detector commissioning
• FAIR 2028 program adapted for all communities
• science opportunities in existing GSI experimental halls (FAIR Phase-0) & in new FAIR complex (FAIR 2028 plan)

Long term (starting end of 2030): Science program w/ full accelerator operation

• beam with heavy ions at high intensities (UNILAC restored, short-pulse)
• focus on research program, FAIR/GSI science fully enabled

From end of 2032 onwards: Science program with HELIAC

• restart of full long-pulse operation with HELIAC enabling super-heavy element searches, advanced material research

For discussions on next beamtimes, experiment requirements and what can be offered in the coming years, meetings are held with spokespersons and link scientists of the different.

2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012,  2014, 2015, 2016, 2018 (as scheduled), 2018 (shorted), 2019, 2020 (old) *** Due to COVID-19 pandemic, the beam time schedule was adapted  Adaption: March 2020;  Adaption March/April ;  Adaption: April, May, and June 2020. ***, 2021, 2022, 2024, 2025

Dr. Daniel Severin

Phone: +49-6159-71 2715

E-Mail: beamtime(at)gsi.de

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.

Dr. Karin Füssel

Phone: +49-6159-71 1441

E-Mail: K.Fuessel(at)gsi.de

Dr. Manuel Vogel

E-Mail: M.Vogel(at)gsi.de

For information how to get beamtime granted at our facilities, please consult the webpage 'Applying for Beamtime'. After having been granted beamtime, please see 'Scheduling of Approved Experiments' for next steps.

Please note that research performed at GSI/FAIR pursues exclusively peaceful purposes, and rules on ethics and scientific conduct apply to external and internal user. Link to Ethics & Rules

Dr. Karin Füssel

(Phone: +49-6159-71 1441)

Dr. Manuel Vogel

(Phone: +49-6159-71 2046)

Dr. Daniel Severin

Phone: +49-6159-71 2715

e-mail: beamtime(at)gsi.de