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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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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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HOM Coupler Alterations for the LHC DQW Crab Cavity
/ Mitchell, James (Lancaster U. (main) ; CERN ; Cockcroft Inst. Accel. Sci. Tech.) ; Burt, Graeme (Lancaster U. (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Calaga, Rama (CERN) ; Shipman, Nicholas (Lancaster U. (main) ; CERN ; Cockcroft Inst. Accel. Sci. Tech.) ; Verdú-Andrés, Silvia (Brookhaven Natl. Lab.) ; Wu, Qiong (Brookhaven Natl. Lab.) ; Xiao, Binping (Brookhaven Natl. Lab.)
As part of the High Luminosity Large Hadron Collider (HL-LHC) project, 16 crab cavities are to be installed in the LHC in 2025. The two crab cavity designs are the Double Quarter Wave (DQW) and Radio Frequency Dipole (RFD). [...]
2018 - 5 p.
- Published in : 10.18429/JACoW-SRF2017-MOPB079
Fulltext: PDF;
In : 18th International Conference on RF Superconductivity, Lanzhou, China, 17 - 21 Jul 2017, pp.MOPB079
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Simulation and Measurements of Crab Cavity HOMs and HOM Couplers for HL-LHC
/ Mitchell, James (Lancaster U. (main) ; CERN ; Cockcroft Inst. Accel. Sci. Tech.) ; Apsimon, Robert (Lancaster U. (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Ben-Zvi, Ilan (Brookhaven Natl. Lab.) ; Burt, Graeme (Lancaster U. (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Calaga, Rama (CERN) ; Castilla, Alejandro (CERN) ; Jones, Thomas (Lancaster U. (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Macpherson, Alick (CERN) ; Powers, Tom (Jefferson Lab) ; Shipman, Nicholas (Lancaster U. (main) ; CERN ; Cockcroft Inst. Accel. Sci. Tech.) et al.
Two Superconducting Radio-Frequency (SRF) crab cavities are foreseen for the High Luminosity LHC (HL-LHC) upgrade. Preliminary beam tests of the Double Quarter Wave (DQW) crab cavity will take place in the Super Proton Synchrotron (SPS) in 2018. [...]
2018 - 5 p.
- Published in : 10.18429/JACoW-SRF2017-THPB059
Fulltext: PDF;
In : 18th International Conference on RF Superconductivity, Lanzhou, China, 17 - 21 Jul 2017, pp.THPB059
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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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