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Erlangen 2001 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 9: Postersitzung: Instrumentation und Anwendungen

HK 9.31: Poster

Tuesday, March 20, 2001, 10:30–12:45, R

Design Calculations for a 101 MHz IH-RFQ for the MAFF-LINAC — •Thomas Sieber1, Oliver Kester1, Dietrich Habs1, Ulrich Ratzinger2, and Alwin Schempp21Sektion Physik, Am Coulombwall 1, 85748 Garching — 2IAP, Robert-Mayer Str. 2-4, 60325

The accelerator for the planned MAFF (Munich Accelerator for Fission Fragments) -project at the new Munich high flux reactor FRM II is in its basic structure similar to the CERN Lead-Injector-LINAC. It has a length of 17 m and consists of a 101.28 MHz RFQ (Radio Frequency Quadrupole) -accelerator, three IH (Interdigital H-Mode) -Drifttube structures (tank1: 101.28 MHz; tank2 and 3: 202.56 MHz) and two Seven-Gap Resonators at 202.56 MHz for variation of the final energy in the range 3.7 - 5.9 MeV/u. The start energy is: 2.5 keV/u. The duty cycle is 10 ratio of the design-ion is: A/q = 6.3.

Besides the two IH-type 7-Gap Resonators, an IH-RFQ is investigated as another innovative component of the MAFF-accelerator. Regarding the good results of the 36 MHz high current injector IH-RFQ of the GSI, we try to show by MAFIA calculations, that advantages of this RFQ-type, like a high efficiency, indirect electrode cooling and a very small dipole content are also available at higher frequencies. For the particle dynamics, an electrode design with a very high transmission (>99 phase spread could be (due to the comparable boundary conditions) derived from the design of the REX-ISOLDE RFQ. The poster shows the results of the MAFIA- and PARMTEQ-calculations together with considerations for the mechanical realization of the IH-RFQ.

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