A Coupled RFQ-IH-DTL Cavity for FRANZ: A Challenge for RF Technology and Beam Dynamics
A Coupled RFQ-IH-DTL Cavity for FRANZ: A Challenge for RF Technology and Beam Dynamics
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DOI：
10.18429/jacow-hb2016-weam1y01
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
R. Tiede;M. Heilmann;O. Meusel;D.Mäder;H. Podlech;U. Ratzinger;A. Schempp;M. Schwarz
中科院分区：
文献类型：
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作者：
R. Tiede;M. Heilmann;O. Meusel;D.Mäder;H. Podlech;U. Ratzinger;A. Schempp;M. Schwarz
对于‘法兰克福斯特恩-格拉奇中心的中子源’(Franz)设施，一个4杆射频四极杆(4Rod-RFQ)和一个8间隙叉指H型(IH-DTL)结构的电感耦合组合将提供从120keV到2.0 MeV的强流质子束的主要加速。RFQ-IH组合全长约2.3米，将以175 MHz的连续波模式运行。预计总电力需求约为200千瓦。由于内部电感耦合，只需要一个射频放大器，大大降低了投资成本。目前，RFQ分别安装在光束线上，以调节到设计的射频功率，并测量RFQ后面的光束质量。同时，IH-DTL与Franz洞穴外的一个虚拟RFQ一起进行射频调谐。本文将介绍该项目的现状，重点介绍束流动力学约束、射频调谐问题以及连续波操作中高热负荷带来的技术挑战等关键问题。
For the ‘Frankfurt Neutron Source at the Stern-GerlachZentrum’ (FRANZ) facility an inductively coupled combination of a 4-Rod-type Radio-Frequency-Quadrupole (4Rod-RFQ) and an 8 gap interdigital H-type (IH-DTL) structure will provide the main acceleration of an intense proton beam from 120 keV to 2.0 MeV. The RFQ-IH combination with a total length of about 2.3 m will be operated at 175 MHz in cw mode. The expected total power need is around 200 kW. Due to the internal inductive coupling only one RF amplifier is needed, which significantly reduces the investment costs. At present the RFQ is installed separately in the beam line for conditioning up to the design rf power and for measuring the beam quality behind the RFQ. In parallel, the IH-DTL is rf tuned together with a dummy RFQ outside the FRANZ cave. This paper will present the status of the project with emphasis on key questions like beam dynamics constraints, rf tuning issues and technological challenges resulting from the high thermal load in cw operation.