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1.
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Analysis of the Panofsky-Wenzel Theorem in pillbox cavities with a beam pipe
/ Wroe, Laurence (CERN) ; Latina, Andrea (CERN) ; Southerby, Matthew (Lancaster U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Apsimon, Robert (Cockcroft Inst. Accel. Sci. Tech. ; Lancaster U.) ; Stapnes, Steinar (CERN) ; Wuensch, Walter (CERN)
In this paper, we derive the multipolar form of the change in transverse and longitudinal momenta of an ultra-relativistic charged particle that traverses a harmonic TM$_{mn0}$ mode in a pillbox cavity with a beam pipe. The relevant equations are first formalised before presenting results from the numerical integration of RF cavity field maps. [...]
2024 - 4 p.
- Published in : JACoW LINAC 2024 (2024) MOPB043
Fulltext: PDF;
In : 32nd Linear Accelerator Conference (LINAC 2024), Chicago, Illinois, United States, 25 - 30 Aug 2024, pp.MOPB043
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2.
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Minimising Transverse Multipoles in Accelerating RF Cavities via Azimuthally Modulated Designs
/ Wroe, Laurence (JAI, UK) ; Apsimon, Robert (Lancaster U. (main)) ; Dosanjh, Manjit (CERN) ; Sheehy, Suzanne (Melbourne U.)
In this paper, we build upon previous work of designing RF structures that support modes with tailored multipolar fields by applying the concept to negate the transverse multipoles in accelerating RF cavities caused by the incorporation of waveguide slots and tuning deformations. We outline a systematic method for designing structures that minimise these transverse multipoles and present analysis of simulations of two different minimisation designs..
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 610-613
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.610-613
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3.
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Electron Beam Based Leather Tanning
/ Apsimon, Robert (Lancaster U. (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Dewhurst, Kay (Lancaster U. (main) ; Cockcroft Inst. Accel. Sci. Tech. ; CERN) ; Setiniyaz, Sadiq (Lancaster U. (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Seviour, Rebecca (Huddersfield U.) ; Turner, Daniel (Lancaster U. (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Wise, William (Unlisted, UK)
Tanning of leather for clothing, shoes, and handbags uses potentially harmful chemicals that often run off into local water supplies or require a large carbon footprint to safely recover these pollutants. In regions of the world with significant leather production, this can lead to a significant environmental impact. [...]
2022 - 5 p.
- Published in : JACoW LINAC 2022 (2022) 645-649
Fulltext: PDF;
In : 31st Linear Accelerator Conference (LINAC22), Liverpool, UK, 28 Aug - 2 Sep 2022, pp.645-649
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4.
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5.
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Status of the CompactLight Design Study
/ D'Auria, Gerardo (Sincrotrone Trieste) ; Aicheler, Markus (Helsinki Inst. of Phys.) ; Aksoy, Avni (Ankara U.) ; Alesini, David (Frascati) ; Apsimon, Robert (Cockcroft Inst. Accel. Sci. Tech.) ; Arnesano, Jordan Matias (Rome U.) ; Bellaveglia, Marco (Frascati) ; Bernhard, Axel (KIT, Karlsruhe) ; Bosco, Fabio (Rome U.) ; Buonomo, Bruno (Frascati) et al.
CompactLight (XLS) is an International Collaboration of 24 partners and 5 third parties, funded by the European Union through the Horizon 2020 Research and Innovation Programme. The main goal of the project, which started in January 2018 with a duration of 36 months, is the design of an hard X-ray FEL facility beyond today’s state of the art, using the latest concepts for bright electron photo-injectors, high-gradient accelerating structures, and innovative short-period undulators. [...]
2019 - 4 p.
- Published in : 10.18429/JACoW-FEL2019-THP078
Fulltext: PDF;
In : 39th International Free Electron Laser Conference, Hamburg, Germany, 26 - 30 Aug 2019, pp.THP078
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6.
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The AWAKE Run 2 programme and beyond
/ AWAKE Collaboration
Plasma wakefield acceleration is a promising technology to reduce the size of particle accelerators. Use of high energy protons to drive wakefields in plasma has been demonstrated during Run 1 of the AWAKE programme at CERN. [...]
arXiv:2206.06040.-
2022-08-12 - 21 p.
- Published in : Symmetry 14 (2022) 1680
Fulltext: 2206.06040 - PDF; document - PDF;
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7.
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Creating Exact Multipolar Fields in Accelerating RF Cavities via an Azimuthally Modulated Design
/ Wroe, Laurence M (JAI, UK) ; Apsimon, Robert J (Cockcroft Inst. Accel. Sci. Tech.) ; Dosanjh, Manjit (JAI, UK ; CERN) ; Sheehy, Suzanne L (JAI, UK ; Melbourne U.)
In this paper, we present a novel method for designing RF structures with specifically tailored multipolar field contributions. This has a range of applications, including the suppression of unwanted multipolar fields or the introduction of wanted terms, such as for quadrupole focusing. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 1154-1157
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1154-1157
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8.
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CompactLight design study
/ D'Auria, Gerardo (Sincrotrone Trieste) ; Aicheler, Markus (U. Helsinki (main)) ; Aksoy, Avni (Ankara U.) ; Alesini, David (Frascati) ; Apsimon, Robert (Lancaster U.) ; Arnesano, Jordan Matias (U. Rome La Sapienza (main)) ; Bellaveglia, Marco (Frascati) ; Bernhard, Axel (KIT, Karlsruhe) ; Bosco, Fabio (U. Rome La Sapienza (main)) ; Buonomo, Bruno (Frascati) et al.
The H2020 CompactLight Project aims at designing the next generation of compact X-rays Free-Electron Lasers, relying on very high gradient accelerating structures (X-band, 12 GHz), the most advanced concepts for high brightness electron photo injectors, and innovative compact short-period undulators. Compared to existing facilities, the proposed facility will benefit from a lower electron beam energy, due to the enhanced undulators performance, and will be significantly more compact, with a smaller footprint, as a consequence of the lower energy and the high-gradient X-band structures. [...]
CERN-ACC-2019-186.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-TUPRB032
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.TUPRB032
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9.
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Collaborative strategies for meeting the global need for cancer radiation therapy treatment systems
/ Dosanjh, Manjit (CERN) ; Aggarwal, Ajay (King's Coll. London) ; Angal-Kalinin, Deepa (Daresbury) ; Apsimon, Robert (Lancaster U. (main)) ; Boogert, Stewart (Royal Holloway, U. of London) ; Burt, Graeme (Lancaster U. (main)) ; Coleman, Norman (Unlisted, US, DC) ; Collier, Paul (CERN) ; Cross, Adrian (Strathclyde U.) ; Konoplev, Ivan (JAI, UK) et al.
The idea of designing affordable equipment and developing sustainable infrastructures for delivering radiation treatment for patients with cancer in countries that lack resources and expertise stimulated a first International Cancer Expert Corps (ICEC) championed, CERN-hosted workshop in Geneva in November 2016. Which has since been followed by three additional workshops involving the sponsorship and support from UK Science and Technology Facilities Council (STFC). [...]
CERN-ACC-2019-228.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-THPMP038
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPMP038
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10.
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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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