Design and optimization of the RF input-coupler for a low-frequency, split-coaxial RFQ

同轴 无线电频率 物理 同轴电缆 声学 电气工程 计算机科学 电信 工程类 电缆密封套
作者
Medani Sangroula,Daniel Winklehner,Maximilian Schuett
出处
期刊:Journal of Instrumentation [Institute of Physics]
卷期号:16 (08): P08061-P08061 被引量:1
标识
DOI:10.1088/1748-0221/16/08/p08061
摘要

The Isotope Decay-At-Rest experiment (IsoDAR) is a proposed underground experiment which is expected to be a definitive search for sterile neutrinos. In order to be decisive within 5 years, high rates of neutrinos must be produced, by impinging a 10 mA continuous wave proton beam at 60 MeV on a high power target. Due to space restrictions, a compact cyclotron was chosen as an accelerator to produce this driver beam. To overcome space charge limitations during injection, H2+ ions are accelerated and later stripped into protons by means of a carbon foil. IsoDAR uses an especially designed low-frequency (32.8 MHz) split-coaxial Radio-Frequency Quadrupole (RFQ) to effectively bunch H2+ ions before injecting them into this cyclotron. The RFQ will be embedded vertically in the cyclotron yoke, facilitating a very compact design. This puts stringent limits on RFQ size, type, and accessibility. Here, we present the design and optimization of the low-frequency (32.8 MHz) RF input-coupler for the IsoDAR RFQ. The design is challenging due to the necessarily small diameter of the RFQ (28 cm) and the split-coaxial type, as well as limited access to the RFQ. We have determined the optimal position and shape for the coupler, leading to a low power consumption of < 6 kW for an inter-vane voltage of 22 kV. The highest calculated fields are safely below the Kilpatrick limit for this structure.
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