​​FACILITY FOR LOW-ENERGY ANTIPROTON AND ION RESEARCH

FLAIR Meeting March 2004: Minutes - Technical Discussion

Tuesday, 16.03.2004, 11:00-12:00

1. LSR

The LSR will be used both for antiprotons and highly charged ions.

1.1 INTERNAL TARGETS

The existing internal target at CRYRING will not be available for FLAIR (belongs to a different group).

Ullrich: A reaction microscope exists and will be available for FLAIR (to be used at ESR in 2005, length approximately 1.5 meters).

Stoehlker: The SPARC collaboration has great interest in internal targets, an electron target is a marvelous option. (Electron cooler and electron target are the same thing.)

Danared: In the moment CRYRING has no free straight section. To free straight sections (a) combine injection and extraction (b) move diagnostics from dedicated section to other sections.

1.2 ION SOURCE

Consensus: Injection from an ion source is important for commissioning the whole FLAIR facility without beam from NESR. This can save a lot of time. Stoehlker: it might take years for the NESR to run perfectly.

Discussion: Is the community interested in keeping the variety of ion sources for experiments? - No strong interest has been expressed.

Danared: injection system can be moved inside the ring. (saves space)

1.3 TIME FOR THE FLAIR BUILDING TO BE FINISHED

FLAIR can be commissioned before beam from NESR becomes available -> ask for the building to be ready at an earlier time.

Skepstedt: want to move CRYRING to Darmstadt in/before 2010. Expects problems with support, if later.

1.4 ENERGY RANGE FOR LSR

Danared: can use a simplified electron cooling system, if everyone is satisfied with 30 MeV maximum energy. - No interest in post-
acceleration has been expressed. Stoehlker: have the NESR for that.

1.5 BEAM LIFETIME

Danared: lifetime for 300 keV deuterons is 2 minutes. Expect similar or better lifetimes for antiprotons. Can test it with negative hydrogen ions if needed. (TBD: find deuteron capture cross section vs. antiproton annihilation cross section.)

2. BEAMLINE FROM SUPER-FRS

Needed for pbar-RI experiments. Open question: where to bring it into the FLAIR hall. Have to clarify that for the Technical Report.

3. USR

Ullrich: there are uncertainties at low energies with electron cooling, but the rest is clear.

3.1 HIGHLY CHARGED IONS IN THE USR?

Stoehlker: the LSR goes down quite far in energy. Does not really see the need to extend the system NESR-LSR-low-energy-cave.

-> no need for HCI in USR -> no cryogenic ring

3.2 POSITRON RING AT THE USR?

The physics case should be looked at: (a) antihydrogen in flight (b) collision physics. Would need a detector for antihydrogen. Rate is about 1 atom/s.

Charlton: physics might be addressed by trap experiments before this is build.

Ullich: Has to be possible to keep the option.

Sidorin: positron ring costs about 500 k$ (without manpower)

4. POSSIBILITIES FOR AGATA

FLAIR does not have to discuss this for the Technical Report

 

Author: J. Walz