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A Ferroelectric Fast Reactive Tuner for Superconducting Cavities
/ Shipman, Nicholas (CERN) ; Bastard, Jeremy (CERN) ; Ben-Zvi, Ilan (Brookhaven Natl. Lab.) ; Burt, Graeme (Lancaster U.) ; Castilla, Alejandro (Lancaster U.) ; Coly, Marcel (CERN) ; Gerigk, Frank (CERN) ; Jing, Chunguang (Euclid Techlabs, Solon) ; Kanareykin, Alexei (Euclid Techlabs, Solon) ; Kazakov, Sergey (Fermilab) et al.
A prototype FerroElectric Fast Reactive Tuner (FE-FRT) for superconducting cavities has been developed, which allows the frequency to be controlled by application of a potential difference across a ferroelectric residing within the tuner. This technique has now become practically feasible due to the recent development of a new extremely low loss ferroelectric material. [...]
SRF2019.-
2019 - 8 p.
- Published in : 10.18429/JACoW-SRF2019-WETEB7
Fulltext: PDF;
In : 19th International Conference on RF Superconductivity, Dresden, Germany, 30 Jun - 05 Jul 2019, pp.783-790
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Ferro-Electric Fast Reactive Tuner Applications for SRF Cavities
/ Shipman, Nicholas C (CERN) ; Ben-Zvi, Ilan (BNL, NSLS) ; Burt, Graeme (Cockcroft Inst. Accel. Sci. Tech.) ; Castilla, Alejandro (Cockcroft Inst. Accel. Sci. Tech. ; CERN) ; Coly, Marcel R (CERN) ; Gerigk, Frank (CERN) ; Jing, Chunguang J (Euclid Techlabs, Solon) ; Kanareykin, Alexei (Euclid Techlabs, Solon) ; Macpherson, Alick (CERN) ; Stapley, Niall (CERN) et al.
A Ferro-Electric fast Reactive Tuner (FE-FRT) is a novel type of RF cavity tuner containing a low loss ferroelectric material. FE-FRTs have no moving parts and allow cavity frequencies to be changed extremely quickly (on the timescale of 100s of ns or less). [...]
Geneva : JACoW, 2021 - 6 p.
- Published in : JACoW IPAC 2021 (2021) 1305-1310
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1305-1310
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A Ferroelectric Fast Reactive Tuner (FE-FRT) to Combat Microphonics
/ Shipman, Nicholas (CERN) ; Bastard, Jeremy (CERN) ; Ben-Zvi, Ilan (Brookhaven) ; Burt, Graeme (Lancaster U.) ; Castilla, Alejandro (Lancaster U.) ; Coly, Marcel (CERN) ; Gerigk, Frank (CERN) ; Jing, Chunguang (Euclid Techlabs, Solon) ; Kanareykin, Alexei (Euclid Techlabs, Solon) ; Macpherson, Alick (CERN) et al.
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. [...]
2020 - 6 p.
- Published in : 10.18429/JACoW-ERL2019-TUCOZBS02
Fulltext: PDF;
In : 63rd ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs, Berlin, Germany, 15 - 20 Sep 2019, pp.TUCOZBS02
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CERN’s SRF Test Stand for Cavity Performance Measurements
/ Stapley, Niall (CERN) ; Bastard, Jeremy (CERN) ; Ben-Zvi, Ilan (Brookhaven Natl. Lab.) ; Castilla, Alejandro (Lancaster U.) ; Coly, Marcel (CERN) ; Hernandez-Chahin, K (Guanajuato U.) ; Ivanov, Anton (CERN) ; Macpherson, Alick (CERN) ; Shipman, Nicholas (CERN) ; Turaj, Katarzyna (CERN) et al.
Recent deployment of a digital LLRF system within the cavity testing framework of CERN’s vertical test cryostats has permitted a full revamp of cavity performance validation. With both full continuous and pulse mode operation, steady state a transient RF behaviour can be effectively probed. [...]
2019 - 5 p.
- Published in : 10.18429/JACoW-SRF2019-THP078
Fulltext: PDF;
In : 19th International Conference on RF Superconductivity, Dresden, Germany, 30 Jun - 05 Jul 2019, pp.1084-1088
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In-situ Bulk Residual Resistivity Ratio Measurement on Double Quarter Wave Crab Cavities
/ Shipman, Nicholas (Lancaster U. (main) ; Cockcroft Inst. Accel. Sci. Tech. ; CERN) ; Ben-Zvi, Ilan (Brookhaven Natl. Lab.) ; Burt, Graeme (Lancaster U. (main)) ; Castilla, Alejandro (CERN) ; Hernández-Chahín, Karim (CERN ; Unlisted, MX) ; Macpherson, Alick (CERN) ; Mitchell, James (Lancaster U. (main) ; Cockcroft Inst. Accel. Sci. Tech. ; CERN)
A four wire measurement was used to measure the bulk RRR on two DQW Crab Cavities. The measurement procedure is explained and the values obtained for each cavity are compared together with the values obtained from Niobium samples of the same stock from which the cavities were manufactured. [...]
2018 - 5 p.
- Published in : 10.18429/JACoW-SRF2017-TUPB014
Fulltext: PDF;
In : 18th International Conference on RF Superconductivity, Lanzhou, China, 17 - 21 Jul 2017, pp.TUPB014
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First RF Performance Results for the DQW Crab Cavities to be Tested in the CERN SPS
/ Castilla, Alejandro (CERN) ; Ben-Zvi, Ilan (Brookhaven Natl. Lab.) ; Burt, Graeme (Lancaster U.) ; Calaga, Rama (CERN) ; Capatina, Ofelia (CERN) ; Dr Schirm, Karl-Martin (CERN) ; Hernández-Chahín, Karim (CERN ; Mexico, ININ) ; Macpherson, Alick (CERN) ; Mitchell, James (Lancaster U.) ; Shipman, Nicholas (Lancaster U. ; U. Manchester (main) ; CERN) et al.
As part of the High Luminosity LHC (HL-LHC) project strategy, crab cavity correctors shall be installed around CMS and ATLAS experiments of the LHC. To accommodate the different crossing angle planes, two distinct cavity designs have been selected: the RF Dipole (RFD) and the Double Quarter Wave resonator (DQW). [...]
CERN-ACC-2017-283.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-MOPVA095
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOPVA095
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Measurement Report for the Four-Rod LHC Crab Cavity. Cold Tests held in July 2014
/ Navarro Tapia, Maria (CERN) ; Burt, G (The Cockcroft Institute, Lancaster University, Daresbury, United Kingdom) ; Calaga, Rama (CERN) ; Hernandez Chahin, Karim Gibran (Universidad de Guanajuato (MX)) ; Junginger, Tobias (CERN) ; Macpherson, Alick (CERN) ; Torres-Sanchez, Roberto (CERN)
The performance of the four-rod cavity prototype considered for the HL-LHC upgrade has already been assessed at CERN at cryogenic temperatures three times in the last two years [1, 2, 3]. [...]
CERN-ACC-NOTE-2015-0016.
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2015. - 15 p.
Full text
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