Beams Document 4154-v1

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Studies on 704 MHz five-cell superconducting RF cavity

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Alexander Sukhanov
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Alexander Sukhanov
Document Created:
12 Jun 2012, 11:34
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12 Jun 2012, 11:34
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12 Jun 2012, 11:34
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Brookhaven National Laboratory is developing SRF technology for high current beams. One element of this program is a five-cell 704 MHz beta=1 cavity which is highly damped. Such a cavity can operate in Energy Recovery Linac at high currents, typically hundreds of milli-amperes. This cavity will be installed in the coherent electron cooler of Relativistic Heavy Ion Collider (RHIC) and a future electron-ion collider (eRHIC). My research at BNL has focused on the studies related to a 704 MHz five-cell superconducting RF accelerating cavity. In order to achieve the optimum performance of the cavity, it is essential to damp the unwanted higher order modes (HOMs) and microphonics. In my talk, I will present the identification and characterization of the undamped higher order modes (HOMs) using bead pull technique and the analysis of the noise data observed during several past test runs. It is crucial for the running of the cavity to keep the thermal load on cryogenics at minimum. This is achieved by a careful design of thermal intercept on the fundamental power coupler (FPC). I will illustrate thermal calculations done under static and dynamic heat loads. Then I will discuss the specifications of coolant for the effective heat removal from the FPC. I will also present a brief summary of my doctoral work – the analysis of electron cloud measurement technique at KEK B-factory.
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