CERN Accelerating science

All CERN Accelerators documents

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2018-11-15
17:27
MD3343 - Fully-Automatic Parallel Collimation Alignment using Machine Learning / Azzopardi, Gabriella (University of Malta (MT)) ; Valentino, Gianluca (University of Malta (MT)) ; Salvachua Ferrando, Belen Maria (CERN)
The collimation system protects the LHC and its sensitive equipment form unavoidable beam losses [...]
CERN-ACC-NOTE-2018-0071.
- 2018. - 8 p.
Full text

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2018-11-15
17:07
MD1653 - Part 1: Characterisation of BLM Response at Collimators / Azzopardi, Gabriella (University of Malta (MT)) ; Valentino, Gianluca (University of Malta (MT)) ; Salvachua Ferrando, Belen Maria (CERN)
The Large Hadron Collider (LHC) has a collimation system which uses an alignment procedure to align the collimators around the beam [...]
CERN-ACC-NOTE-2018-0070.
- 2018. - 8 p.
Full text

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2018-11-15
06:18
Exploratory Study of X-band Klystron Designs for Maximum Efficiency / Weatherford, Brandon (SLAC) ; Kowalczyk, Richard (SLAC) ; Dolgashev, Valery (SLAC) ; Neilson, Jeffrey (SLAC) ; Jensen, Aaron (Unlisted, US, MA) ; Syratchev, Igor (CERN) ; Cai, Jinchi (CERN)
Results are reported from an exploratory study of high efficiency X-band klystron designs. A variety of simulation tools are used to determine the peak achievable efficiency as a function of beam and circuit parameters. [...]
2018 - 2 p. - Published in : 10.1109/IVEC.2018.8391533

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2018-11-15
06:17
Beam-loading effect on breakdown rate in high-gradient accelerating cavities: An experiment at the Compact Linear Collider Test Facility at CERN / Senes, Eugenio (Oxford U. ; CERN) ; Argyropoulos, Theodoros (Valencia U., IFIC ; CERN) ; Tecker, Frank (CERN) ; Wuensch, Walter (CERN)
Radio frequency breakdown rate is a crucial performance parameter that ensures that the design luminosity is achieved in the CLIC linear collider. The required low breakdown rate for CLIC, of the order of 10$^{-7}$  breakdown pulse${-1}$ m${-1}$, has been demonstrated in a number of 12 GHz CLIC prototype structures at gradients in excess of the design 100  MV/m accelerating gradient, however without the presence of the accelerated beam and associated beam loading. [...]
2018 - 8 p. - Published in : Phys. Rev. Accel. Beams 21 (2018) 102001 Fulltext: PDF;

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2018-11-14
06:23
Dose gradient assessment at the new CERN CHARM irradiation facility / Infantino, A (CERN) ; Cangialosi, C (CERN) ; Krawina, M (CERN) ; Brucoli, M (CERN) ; Brugger, M (CERN) ; De Carvalho Saraiva, J P (CERN) ; Danzeca, S (CERN)
CERN CHARM facility provides a unique complex radiation environment characterized by particle energy spectra representative of high-energy accelerators, ground and atmospheric conditions and space applications. [...]

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2018-11-13
12:17
The CLIC Potential for New Physics / De Blas Mateo, Jorge (Universita e INFN, Padova (IT)) ; Franceschini, Roberto (Universita e INFN Roma Tre (IT)) ; Riva, Francesco (Universite de Geneve (CH)) ; Roloff, Philipp Gerhard (CERN) ; Schnoor, Ulrike (CERN) ; Spannowsky, Michael (University of Durham (GB)) ; Wells, James D (University of Michigan) ; Wulzer, Andrea (CERN) ; Zupan, Jure (University of Cincinnati (US))
The Compact Linear Collider (CLIC) is a mature option for the future of high energy physics. It combines the benefits of the clean environment of $e^+e^−$ colliders with the possibility of operating at centre-of-mass energies able to probe scales beyond the reach of Large Hadron Collider (LHC) for many scenarios of new physics. [...]
CLICdp-Draft-2018-021.- Geneva : CERN, 2018 - 257. Fulltext: PDF;

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2018-11-13
06:27
Development of a control strategy for the 18 MW power converter of the CERN PS Booster accelerator / Rocca, Stefano (CERN) ; Boattini, Fulvio (CERN) ; de Paco Soto, Luis Miguel (CERN)
In the frame of the Large Hadron Collider Injectors Upgrade project, a new 18 MW power converter is required for the supply of the main magnets in the PS Booster accelerator. [...]
2018. - 8 p.

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2018-11-13
06:27
Novel measurement technique for the electromagnetic characterization of coating materials in the sub-THz frequency range / Passarelli, Andrea (CERN ; Darmstadt, Tech. U.) ; Bartosik, Hannes (CERN) ; Rumolo, Giovanni (CERN) ; Vaccaro, Vittorio Giorgio (INFN, Naples) ; Masullo, Maria Rosaria (INFN, Naples) ; Koral, Can (INFN, Naples) ; Papari, Gian Paolo (Naples U. ; INFN, Naples) ; Andreone, Antonello (Naples U. ; INFN, Naples) ; Boine-Frankenheim, Oliver (Darmstadt, Tech. U.)
This paper describes a reliable, handy, and inexpensive measurement system to characterize, in the sub-THz frequency range, the coating materials used in the beam pipes of accelerators. The method is based on time domain measurements of an electromagnetic wave passing through a waveguide having a thin central slab, where the coating material is deposited on both sides. [...]
2018 - 11 p. - Published in : Phys. Rev. Accel. Beams 21 (2018) 103101 Fulltext: PDF;

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2018-11-13
06:27
DC vacuum breakdown in an external magnetic field / Lebedynskyi, S (Sumy, Inst. Appl. Phys.) ; Karpenko, O (Sumy, Inst. Appl. Phys.) ; Kholodov, R (Sumy, Inst. Appl. Phys.) ; Baturin, V (Sumy, Inst. Appl. Phys.) ; Profatilova, Ia (Sumy, Inst. Appl. Phys. ; CERN) ; Shipman, N (CERN) ; Wuensch, W (CERN)
The subject of the present theoretical and experimental investigations is the effect of the external magnetic field induction on dark current and a possibility of breakdown. The generalization of the Fowler-Nordheim equation makes it possible to take into account the influence of a magnetic field parallel to the cathode surface on the field emission current. [...]
2018 - 7 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 908 (2018) 318-324 Fulltext: PDF;

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2018-11-13
06:27
High Power Conditioning of X-Band RF Components / Catalán Lasheras, Nuria (CERN) ; Damerau, Heiko (CERN) ; Gerard, Romain Louis (CERN) ; Grudiev, Alexej (CERN) ; Lucas, Thomas (Melbourne U.) ; McMonagle, Gerard (CERN) ; Paszkiewicz, Jan (CERN) ; Pitman, Sam (Lancaster U.) ; Solodko, Anastasiya (CERN) ; Syratchev, Igor (CERN) et al.
As part of the effort to qualify CLIC accelerating struc-tures prototypes, new X-band test facilities have been built and commissioned at CERN in the last years. In this context, a number of RF components have been designed and manufactured aiming at stable operation above 50 MW peak power and several kW of average power. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-WEPMF074 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPMF074

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