Freiburg 1999 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 4: Kernphysik I / Exotische Kerne I

HK 4.2: Group Report

Monday, March 22, 1999, 14:30–15:00, B

Status of the REX-ISOLDE project — •O. Kester and D. Habs — Sektion Physik der LMU München, Am Coulombwall 1, D-85748 Garching

The Radioactive beam Experiment (REX-ISOLDE) [1,2] a pilot experiment testing a new concept of charge breeding and post acceleration of radioactive isotopes at ISOLDE/CERN is now being built up at CERN. The principle of the experiment is: Radioactive singly charged ions delivered by the on-line mass separator ISOLDE are first accumulated in a Penning trap, then charge emhanced to A/q = 4.5 in an electron beam ion source (EBIS) and finally accelerated in a 10 m long LINAC from 5 keV/u to the final energy between 0.8 and 2.2 MeV/u. The resonant structures of the LINAC consist of a Radio Frequency Quadrupole (RFQ) accelerator, an interdigital H-type structure (IH) and three seven gap resonators, which allow to vary the target beam energy [3]. First test measurements of the REX-trap and of the RFQ will be presented, as well as the built up status. In addition the status of the EBIS, the low level measurments of the IH-structures and the power tests of the first 7-gap resonator in Heidelberg will be shown. The status of the target area with the particle detector and the Ge-detector array MINIBALL will be presented as well.

[1] D. Habs et al., Nucl. Phys. A616 (1997) 29c

[2] D. Habs et al., Nucl. Instrum and Meth. B126 (1997) 218

[3] D. Habs et al., Nucl. Instrum. and Meth. B139 (1998) 128