- Author(s):
- Thomas Beier, Ludwig Dahl, H.-Jürgen Kluge, Christophor Kozhuharov, Wolfgang Quint, Editors:
- Corporate author(s) of the document:
- GSI Darmstadt
- Publishing date:
- 2003-10-28
- Abstract:
- The design of the HITRAP facility at the Experimental Storage Ring (ESR) at GSI is presented. The facility will employ deceleration of heavy highly-charged ions from 4 MeV/u down to cryogenic temperatures. Ions up to U92+ at 4 MeV/u will be provided by the ESR. The possibility to decelerate ions to such low energies and extract them from the ESR forms an essential part of this proposal. Deceleration down to 3 MeV/u has been successfully per-formed in the ESR. Extraction at this energy and the pointing stability of the extracted beam are under current investigation. The further deceleration in the HITRAP facility itself is pro-vided by a single Interdigital-H (IH) structure operated at 108.408 MHz, which reduces the energy down to 500 keV/u, followed by a Radio-Frequency-Quadrupole (RFQ) structure op-erated at the same frequency for further deceleration to 6 keV/u. In order to increase the effi-ciency, a buncher will be placed before the IH structure, and another one between the IH and the RFQ structure.
After the RFQ structure, the ions will be trapped and cooled down to cryogenic tem-peratures by means of electron and resistive cooling. From this trap, they can be extracted again and used for experiments. Extraction is possible both in DC mode and bunched mode at a total rate of 10 5 ions / 10sec. Transfer takes place in bakeable transfer lines at ultra-high vacuum (10 –11. mbar). Typical extraction voltages will be around 10 kV.
Existing 200-kW RF-tube amplifiers can supply both decelerator structures. This con-siderably reduces the costs for the set-up. Bunchers, IH, RFQ, and cooler trap will be located in the re-injection channel that leads from the Experimental Storage Ring, ESR, to the Heavy-Ion Synchrotron, SIS, along the existing beam line. The experiments behind the cooler trap will be located on top of the re-injection channel where the cold ions are guided by an ultra-high vacuum beam line. The necessary supplies and the control rooms for the experiments will be put on a platform above the existing power supplies for the magnets in the re-injection-channel. Requirements for the additional electrical power and for cooling water are met at the planned location.
The total calculated costs of the facility amount to 2.86 MEuro. Design and construc-tion of the HITRAP facility will take two years.
- Keywords:
- HITRAP, TDR
gsi.de