CERN Accelerating science

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2018-11-10
06:23
Resistive-Wall Impedance of Insertions for FCC-hh / Riemann, Bernard (Dortmund U., DELTA) ; Arsenyev, Sergey (CERN) ; Khan, Shaukat (Dortmund U., DELTA) ; Schulte, Daniel (CERN)
In this work, transverse and longitudinal resistive-wall impedances for beam pipes in the experiment, injection, extraction and RF systems insertion regions of the Future Hadron-Hadron Collider (FCC-hh) are computed based on contributions from different given cross sections of the surrounding (elliptical) chamber parts along the beam path, their temperature-dependent conductivities, and optical functions. An emphasis is placed on the behaviour of transverse impedance in the main experimental regions (A and G), where maximum beta values of $10^4$ to $10^5$ m occur in dependence of the operation mode respectively lattice configuration. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-MOPMK014 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMK014

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2018-11-10
06:23
Modelling Wake Impedance of a Rough Surface in Application to the FCC-hh Beamscreen / Arsenyev, Sergey (CERN) ; Schulte, Daniel (CERN)
The inner surface of the future circular collider (FCC-hh) beamscreen is proposed to be laser-treated in order to mitigate the electron cloud build-up. However, the rough structure of the treated surface can result in unwanted impedance increase, potentially leading to the transverse mode coupling instability (TMCI). [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-MOPMF031 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF031

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2018-11-09
08:54
External Electron Injection for the AWAKE Experiment / Turner, Marlene (CERN ; Heidelberg, Max Planck Inst.) ; Bracco, Chiara (CERN) ; Gessner, Spencer (CERN ; Heidelberg, Max Planck Inst.) ; Goddard, Brennan (CERN ; Heidelberg, Max Planck Inst.) ; Gschwendtner, Edda (CERN ; Heidelberg, Max Planck Inst.) ; Muggli, Patric (CERN ; Heidelberg, Max Planck Inst.) ; Asmus, Felipe Pena (CERN ; Heidelberg, Max Planck Inst.) ; Velotti, Francesco (CERN ; Heidelberg, Max Planck Inst.) ; Verra, Livio (CERN ; Heidelberg, Max Planck Inst.)
We summarize and explain the realization of witness particle injection into wakefields for the AWAKE experiment. [...]
arXiv:1810.04202.
- 5 p.
Fulltext

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2018-11-08
06:40
Qualification of ITER Correction Coil Superconducting Joint / Wang, Lin ; Wu, Weiyue ; Wei, Jing ; Ilyin, Yuri ; Dolgetta, Nello ; Simon, Fabrice ; Libeyre, Paul ; Aviles Santillana, Ignacio (CERN) ; Langeslag, Stefanie ; Sgobba, Stefano et al.
The correction coils (CCs) are a system of 18 superconducting coils composed of top CCs, side CCs, and bottom CCs, and are required to correct asymmetries and reduce magnetic error fields detrimental to the plasma performance of the ITER machine. The CC terminals will be connected with those of the superconducting busbars with twin-box joints. [...]
2018 - 6 p. - Published in : IEEE Trans. Plasma Sci. 46 (2018) 3223-3228

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2018-11-08
06:40
The CERN Gamma Factory Initiative: An Ultra-High Intensity Gamma Source / Krasny, Mieczyslaw (Paris U., VI-VII ; CERN) ; Alemany-Fernández, Reyes (CERN) ; Antsifarov, P (Troitsk, Inst. Spectroscopy) ; Apyan, Armen (Yerevan Phys. Inst.) ; Bartosik, Hannes (CERN) ; Bessonov, Evgeny (Lebedev Phys. Inst., Moscow) ; Biancacci, Nicolo (CERN) ; Bieron, Jacek (Jagiellonian U.) ; Budker, Dmitry (Helmholtz Inst., Mainz) ; Cassou, Kevin (Orsay, LAL) et al.
This contribution discusses the possibility of broadening the present CERN research programme making use of a novel concept of light source. The proposed, Partially Stripped Ion beam driven, light source is the backbone of the Gamma Factory (GF) initiative. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-WEYGBD3 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEYGBD3

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2018-11-06
11:23
Optics optimization of longer L* Beam Delivery System designs for CLIC and tuning of the ATF2 final focus system at ultra-low β* using octupoles / Plassard, Fabien (CERN) ; Tomas, Rogelio (dir.) (CERN) ; Bambade, Philip (dir.) (LAL, University Paris Sud)
The future machines considered to carry out high precision physics in the TeV energy regime are electron-positron (e+e−) linear colliders. Future linear colliders feature nanometer beam spot sizes at the Interaction Point. [...]
CERN-THESIS-2018-223.- https://tel.archives-ouvertes.fr/tel-01893067 : HAL, 2018-10-13 - 166 p. Fulltext: PDF; External link: Approve this document (restricted)

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2018-11-06
09:27
First storage experiment at 270 GeV and observations of single bunch storage (9 June 1978) / Gareyte, Jacques (CERN) ; Kuhn, H K (CERN) ; Linnecar, T (CERN) ; Mills, W (CERN) ; Pahud, J D (CERN) ; Thomas, D (CERN) ; Wilson, Edmund J N (CERN)
CERN-SPS-Improvement-Report-141.
- 1978. - 8 p.
Full text

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2018-11-06
06:56
Measurements of Electromagnetic Properties of Ferrites as a Function of Frequency and Temperature / Chmielinska, Agnieszka (CERN ; Ecole Polytechnique, Lausanne) ; Barnes, Michael (CERN) ; Caspers, Fritz (CERN) ; Popovic, Branko (CERN) ; Vollinger, Christine (CERN)
Fast kicker magnets are used to inject beam into and extract beam out of the CERN accelerator rings. These kickers are often ferrite loaded transmission line type magnets with a rectangular shaped aperture through which the beam passes. [...]
2018 - 7 p. - Published in : (2018) , pp. WEPMF089
- Published in : J. Phys. : Conf. Ser.: 1067 (2018) , no. 8, pp. 082018 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPMF089

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2018-11-06
06:56
Higher-Harmonic RF System for Landau Damping in the CERN PS / Damerau, Heiko (CERN) ; Lasheen, Alexandre (CERN) ; Shaposhnikova, Elena (CERN)
Longitudinal coupled-bunch instabilities after transition crossing and at the flat-top limit the intensity of LHC-type beams in the CERN Proton Synchrotron (PS). A dedicated coupled-bunch feedback for dipole oscillation modes, using a Finemet cavity as wide-band longitudinal kicker, suppresses the instabilities up to an intensity of about 2·10¹¹ particles per bunch at extraction. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-TUPAF026 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF026

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2018-11-06
06:56
Observations, Analysis and Mitigation of Recurrent LHC Beam Dumps Caused by Fast Losses in Arc Half-Cell 16L2 / Jimenez, José (CERN) ; Amorim, David (CERN ; U. Grenoble Alpes) ; Antipov, Sergey (CERN) ; Arduini, Gianluigi (CERN) ; Bertarelli, Alessandro (CERN) ; Biancacci, Nicolo (CERN) ; Bradu, Benjamin (CERN) ; Bravin, Enrico (CERN) ; Bregliozzi, Giuseppe (CERN) ; Brodzinski, Krzysztof (CERN) et al.
Recurrent beam dumps significantly perturbed the operation of the CERN LHC in the summer months of 2017, especially in August. These unexpected beam dumps were triggered by fast beam losses that built up in the cryogenic beam vacuum at the half-cell 16 left of LHC-IP2 and were detected either at that location but mainly in the collimation insertions. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-MOPMF053 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF053

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