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1.
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Investigating the Superconducting Properties and Surface Morphology of Sputtered Nb Films on Cu Due to Laser Treatment
/ Turner, Daniel Andrew (Lancaster U.) ; Malyshev, O B (Cockcroft Inst. Accel. Sci. Tech.) ; Burt, G (Lancaster U.) ; Seiler, E (Bratislava, Inst. Phys.) ; Ries, R (Bratislava, Inst. Phys.) ; Medvids, A (Riga Tech. U.) ; Onufrijevs, P (Riga Tech. U.) ; Valizadeh, R (Cockcroft Inst. Accel. Sci. Tech.) ; Sublet, A (CERN) ; Pira, C (INFN, Legnaro) et al.
Bulk niobium is currently the material of choice for superconducting radio frequency (SRF) cavities and is a well matured process. However, it is possible that SRF cavities could be further improved beyond bulk Nb by sputtering thin Nb films onto Cu cavities. [...]
2023 - 12 p.
- Published in : IEEE Trans. Appl. Supercond. 33 (2023) 1-12
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2.
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RF Characterisation of New Coatings for Future Circular Collider Beam Screens
/ Krkotić, Patrick (CELLS - ALBA, LLS ; Barcelona, Polytechnic U.) ; Calatroni, Sergio (CERN) ; Granados, Xavier (Barcelona, Autonoma U.) ; Gutierrez, Joffre (Barcelona, Autonoma U.) ; Hannah, Adrian (Daresbury) ; Malyshev, Oleg B (Daresbury) ; O'Callaghan, J M (Barcelona, Polytechnic U.) ; Pérez, Francis (CELLS - ALBA, LLS) ; Pont, Montserrat (CELLS - ALBA, LLS) ; Puig, Teresa (Barcelona, Autonoma U.) et al.
For the future high energy colliders being under the design at this moment, the choice of a low surface impedance beam screen coating material has become of fundamental importance to ensure sufficiently low beam impedance and consequently guaranteed stable operation at high currents. We have studied the use of high-temperature superconducting coated conductors as possible coating materials for the beam screen of the FCC-hh. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 2453-2456
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.2453-2456
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3.
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4.
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Laser ablated surface engineering: from discovery to machine application
/ Valizadeh, R (Daresbury) ; Malyshev, O b (Daresbury) ; Sian, T (Daresbury ; U. Manchester (main)) ; Colligon, J S (Daresbury) ; Li, Q (U. Liverpool (main)) ; Perrie, W (U. Liverpool (main))
In the past few years we have established that Laser Ablation Surface Engineering (LASE) is a very effective way of producing surfaces which have Secondary Electron yields (SEY) < 1. These can be achieved with a variety of laser pulse durations from nano- to pico seconds. [...]
2020 - 8 p.
Fulltext from publisher: PDF;
In : ECLOUD’18: Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, La Biodola, Isola d'Elba, Italy, 3 - 7 Jun 2018, pp.209-216 (CERN-2020-007)
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6.
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Beam induced vacuum effects in the future circular hadron collider beam vacuum chamber
/ Bellafont, I (CELLS - ALBA, LLS ; CERN) ; Mether, L (Ecole Polytechnique, Lausanne ; CERN) ; Kersevan, R (CERN) ; Malyshev, O B (Daresbury) ; Baglin, V (CERN) ; Chiggiato, P (CERN) ; Pérez, F (CELLS - ALBA, LLS)
EuroCirCol is a conceptual design study of a post-LHC, Future Circular Hadron Collider (FCC-hh) with 50 TeV of beam energy and 100 km long, which aims to expand the current energy and luminosity frontiers. The vacuum chamber of the FCC-hh will have to cope with unprecedented levels of synchrotron radiation power for proton colliders, dealing simultaneously with a tighter magnet aperture. [...]
2020 - 15 p.
- Published in : Phys. Rev. Accel. Beams 23 (2020) 043201
Fulltext from Publisher: PDF;
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7.
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High Frequency Nonlinear Response of Superconducting Cavity-Grade Nb surfaces
/ Oripov, Bakhrom (Maryland U.) ; Bieler, Thomas (Michigan State U.) ; Ciovati, Gianluigi (Jefferson Lab) ; Calatroni, Sergio (CERN) ; Dhakal, Pashupati (Jefferson Lab) ; Junginger, Tobias (Lancaster U. (main)) ; Malyshev, Oleg B. (Daresbury) ; Terenziani, Giovanni (CERN) ; Valente-Feliciano, Anne-Marie (Jefferson Lab) ; Valizadeh, Reza (Daresbury) et al.
Nb superconducting radio-frequency (SRF) cavities are observed to break down and lose their high-Q superconducting properties at accelerating gradients below the limits imposed by theory. The microscopic origins of SRF cavity breakdown are still a matter of some debate. [...]
arXiv:1904.07432.-
2019-06-13 - 9 p.
- Published in : Phys. Rev. Applied 11 (2019) 064030
Fulltext: PDF;
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Vacuum systems for the ILC helical undulator
/ Malyshev, O B (Daresbury ; Cockcroft Inst. Accel. Sci. Tech.) ; Scott, D J (Daresbury ; Cockcroft Inst. Accel. Sci. Tech.) ; Clarke, J A (Daresbury ; Cockcroft Inst. Accel. Sci. Tech.) ; Bailey, I R (Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Dainton, J B (Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Malysheva, L I (Liverpool U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Barber, D P (DESY) ; Cooke, P (Liverpool U.) ; Baynham, E (Rutherford) ; Bradshaw, T (Rutherford) et al.
The International Linear Collider (ILC) positron source uses a helical undulator to generate polarized photons of ∼10MeV∼10MeV at the first harmonic. Unlike many undulators used in synchrotron radiation sources, the ILC helical undulator vacuum chamber will be bombarded by photons, generated by the undulator, with energies mostly below that of the first harmonic. [...]
EUROTEV-REPORT-2006-086.-
2007 - 28 p.
- Published in : J. Vac. Sci. Technol. A A 25 (2007) 791
Fulltext: PDF; External link: DESY
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Recommendation for the Feasibility of more Compact LC Damping Rings
/ Pivi, M.T.F. (SLAC) ; Wang, L. (SLAC) ; Demma, T. (Frascati) ; Guiducci, S. (Frascati) ; Suetsugu, Y. (KEK, Tsukuba) ; Shibata, K. (KEK, Tsukuba) ; Ohmi, K. (KEK, Tsukuba) ; Dugan, G. (Cornell U.) ; Palmer, M. (Cornell U.) ; Crittenden, J.A. (Cornell U.) et al.
As part of the international Linear Collider (ILC) collaboration, we have compared the electron cloud (EC) effect for different Damping Ring (DR) designs respectively with 6.4 km and 3.2 km circumference and investigated the feasibility of the shorter damping ring with respect to the electron cloud build-up and related beam instabilities. The studies for a 3.2 km ring were carried out with beam parameters of the ILC Low Power option [...]
2010
External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPE097
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