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MS: Massenspektrometrie

MS 6: Hochaufgelöste und genaue Massenspektrometrie

MS 6.2: Talk

Tuesday, March 23, 2004, 17:15–17:30, HS 112

Commissoning the Penning trap mass spectrometer at the SHIPTRAP facility — •rahaman Saidur¹, D. Beck¹, M. Block¹, H.-J. Kluge¹, G. Marx², M. Mukherjee¹, W. Quint¹, D. Rodriguez¹, C. Rauth¹, G. Sikler¹, M. Suhonen³, and C Weber¹ — ¹GSI, Darmstadt, Germany — ²EMAU, Greifswald, Germany — ³Stockholm University, Stockholm, Sweden

The ion-trap facility SHIPTRAP at GSI is installed behind SHIP for a broad scientific program such as precision mass measurements, nuclear spectroscopy, study of chemical reactions and laser spectroscopy of super-heavy radionuclides. SHIPTRAP consists of three parts. The first one is a gas-filled cell for stopping energetic ions. The second part, the RFQ-buncher, cools and accumulates ions by buffer-gas collisions. The third part, a Penning-trap system, consists of two cylindrical Penning traps in one superconducting magnet with B=7 T. The two traps are separated by a pumping barrier of 3 mm diameter and length of 50 mm which allows for the required differential pumping between the two traps. The first trap is for isobaric purification of the ions applying the method of mass-selective buffer gas cooling. In the second one precision mass measurement will be performed. Significant progress has been made to bring the Penning trap system into operation. Ions can be trapped in both traps. In the first trap a mass resolving power of 85 000 has been achieved for Cs with 200 ms excitation time. In the second trap the ions mass is measured via their cyclotron frequency usuing the time-of-flight method. A first online mass measurement is planned for 2004.