Paper | Title | Page |
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TUCOZBS02 | A Ferroelectric Fast Reactive Tuner (FE-FRT) to Combat Microphonics | 42 |
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A prototype Fast Reactive Tuner (FRT) for superconducting cavities has been developed, which allows the frequency to be controlled by application of a potential difference across a newly developed ultra-low loss ferro-electric material residing within the tuner. The tuner operates at room temperature, outside of the cryostat and coupled to the cavity via an antenna and co-axial cable. This technique allows for active compensation of microphonics, eliminating the need to design over-coupled fundamental power couplers and thus significantly reducing RF power particularly for low beam current applications. Modelling; simulation; and stability analysis, of the tuner; cavity; measurement system; and feedback loop, have been performed in the frequency and time domain, and are compared to the latest experimental results. The potential benefits of applying this techniques to ERLs, which are seen as one of the major use cases, are detailed both in general and with regards to specific projects. Ideas and designs for an improved next generation FRT are also discussed. | ||
Slides TUCOZBS02 [5.607 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-TUCOZBS02 | |
About • | paper received ※ 17 September 2019 paper accepted ※ 06 November 2019 issue date ※ 24 June 2020 | |
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THCOYBS02 | High Charge High Current Beam From BNL 113 MHz SRF Gun | 145 |
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Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. The 113 MHz superconducting gun is used an electron source for the coherent electron cooling experiment. The unique feature of the gun is that a photocathode is held at room temperature. It allowed to preserve the quantum efficiency of Cs2KSb cathode which is adversely affected by cryogenic temperatures. Relatively low frequency permitted fully realize the accelerating field gradient what in turn helps to achieve 10 nC charge and 0.3 microns normalized emittance. We present the achieved performance and operational experience as well. |
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Slides THCOYBS02 [4.350 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-THCOYBS02 | |
About • | paper received ※ 03 September 2019 paper accepted ※ 08 July 2020 issue date ※ 24 June 2020 | |
Export • | reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml) | |