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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 8: Beam Dynamics II

AKBP 8.5: Talk

Wednesday, March 20, 2024, 12:30–12:45, E 020

Modes Investigation for a Coupled Cross-bar H-type Cavity — •Ali Almomani¹ and Ulrich Ratzinger² — ¹Physics Department, Faculty of Science, Yarmouk University, 211-63 Irbid, Jordan — ²Institute for Applied Physics, University of Frankfurt, Max-von-Laue Str. 1, 60438 Frankfurt am Main, Germany

The development of Cross-bar H-type cavities (CH-DTL) lasts since more than 20 years at IAP - Frankfurt and GSI - Darmstadt. In comparison with the conventional DTL, the H-type cavities show advantages with respect to the effective field gradient and to the shunt impedance at an energy range up to 100 A MeV. Efficient H - mode DTL's can be designed when applying the KONUS beam dynamics. Up to around 35 MeV, it is attractive to integrate one triplet lens into each cavity, as one KONUS section is relatively short and would not exploit the full RF power of 3 MW klystrons. Such a cavity is denoted as Coupled CH - cavity CCH. It can be seen as a coupled resonator connecting of two accelerating drift tube sections and one coupling cell containing of the triplet housing drift tube. In a second step, the second accelerator section of the CCH - cavity is rotated by 90°. In a third step, the coupling cell in the original CCH - cavity is rotated by 90°. In a fourth step, the coupling cell in the original CCH - cavity is exchanged by an ordinary accelerating drift tube section. As a result, it is shown that the RF behaviour for the first three modes is nearly identical. This means, that the tuning behaviour of the CCH - cavity can be simply deduced from the ordinary CH - cavity by replacing the coupling cell by an ordinary drift tube structure.

Keywords: Crossbar H-type; Coupling CH