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41.
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Performance of the CERN Low Energy Ion Ring (LEIR) with Xenon beams
/ Alemany-Fernández, Reyes (CERN) ; Albright, Simon (CERN) ; Andujar, Oscar (CERN) ; Angoletta, Maria Elena (CERN) ; Axensalva, Jerome (CERN) ; Bartosik, Hannes (CERN) ; Baud, Guillaume (CERN) ; Biancacci, Nicolo (CERN) ; Bozzolan, Michele (CERN) ; Cettour Cave, Stephane (CERN) et al.
In 2017 the CERN Low Energy Ion Ring demonstrated once more the feasibility of injecting, accumulating, cooling and accelerating a new nuclei, $^{129}$Xe${39+}$. The operation of this new ion species started at the beginning of March with the start up of the xenon ion source and the Linac3. [...]
CERN-ACC-2018-144.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-TUPAF020
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF020
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42.
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Electron Cooling Simulation and Experimental Benchmarks at LEIR
/ Latina, Andrea (CERN) ; Bartosik, Hannes (CERN) ; Biancacci, Nicolo (CERN) ; Corsini, Roberto (CERN) ; Gamba, Davide (CERN) ; Hirlaender, Simon (CERN) ; Huschauer, Alexander (CERN)
A simulation of the electron cooling has recently been implemented in the tracking code RF-Track. The implementation was based on a "hybrid kinetic" model, where the full 6-D phase space of a particle beam is immersed in a fluid plasma of electrons. [...]
CERN-ACC-2018-145.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-TUPAF039
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF039
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43.
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Studies of the Injection and Cooling Efficiency in LEIR Using the Longitudinal Schottky Spectrum
/ Hirlaender, Simon (CERN) ; Alemany-Fernández, Reyes (CERN) ; Bartosik, Hannes (CERN) ; Biancacci, Nicolo (CERN) ; Kain, Verena (CERN)
The CERN Low Energy Ion Ring (LEIR) has two main operational beams with their associated cycles, the so-called EARLY and the NOMINAL beam. The EARLY beam consists of a single injected pulse from the LINAC3 accelerator, whereas seven consecutive injections are accumulated, and electron cooled for the NOMINAL beam. [...]
CERN-ACC-2018-146.-
2018 - 3 p.
- Published in : 10.18429/JACoW-IPAC2018-TUPAF036
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF036
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44.
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Low-Impedance Collimators for HL-LHC
/ Antipov, Sergey (CERN) ; Amorim, David (U. Grenoble Alpes) ; Bertarelli, A (CERN) ; Biancacci, Nicolo (CERN) ; Bruce, Roderik (CERN) ; Mereghetti, Alessio (CERN) ; Mirarchi, Daniele (CERN) ; Métral, Elias (CERN) ; Redaelli, Stefano (CERN) ; Salvant, Benoit (CERN)
The High-Luminosity upgrade of the Large Hadron Collider (HL-LHC) will double its beam intensity for the needs of High Energy Physics frontier. This increase requires a reduction of the machine's impedance to ensure the coherent stability of the beams until they are put in collision. [...]
CERN-ACC-2018-147.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-WEYGBE4
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEYGBE4
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45.
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Single-Collimator Tune Shift Measurement of the Three-Stripe Collimator at the LHC
/ Antipov, Sergey (CERN) ; Amorim, David (U. Grenoble Alpes) ; Biancacci, Nicolo (CERN) ; Carver, Lee (CERN) ; Mazzacano, Giacomo (U. Rome La Sapienza (main)) ; Mereghetti, Alessio (CERN) ; Métral, Elias (CERN) ; Redaelli, Stefano (CERN) ; Salvant, Benoit (CERN) ; Valuch, Daniel (CERN)
Several options of low resistivity coating have been proposed for the collimator upgrade of the Large Hadron Collider. In order to study their effect on the beam dynamics a special collimator has been built and installed in the machine. [...]
CERN-ACC-2018-148.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-THPAF035
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAF035
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46.
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Instability Observations in the Large Hadron Collider During Run 2
/ Carver, Lee (CERN) ; Amorim, David (CERN) ; Antipov, Sergey (CERN) ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Iadarola, Giovanni (CERN) ; Li, Kevin (CERN) ; Maclean, Ewen (CERN) ; Mether, Lotta (CERN ; Ecole Polytechnique, Lausanne) ; Métral, Elias (CERN) et al.
Instabilities of many different types and characteristics have been observed in the LHC during Run 2. The origin of these instabilities come from a variety of stabilising and destabilising mechanisms. [...]
CERN-ACC-2018-149.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-THPAF057
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAF057
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47.
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Lifetime and Beam Losses Studies of Partially Strip Ions in the SPS ($^{129}$Xe$^{39+}$)
/ Hirlaender, Simon (CERN) ; Alemany-Fernández, Reyes (CERN) ; Bartosik, Hannes (CERN) ; Biancacci, Nicolo (CERN) ; Bohl, Thomas (CERN) ; Cettour Cave, Stephane (CERN) ; Cornellis, Karel (CERN) ; Goddard, Brennan (CERN) ; Kain, Verena (CERN) ; Krasny, Mieczyslaw (Paris U., VI-VII ; Paris, IN2P3 ; CERN) et al.
The CERN multipurpose Gamma Factory proposal relies on using Partially Stripped Ion (PSI) beams, instead of electron beams, as the drivers of its light source. If such beams could be successfully stored in the LHC ring, fluxes of the order of $10^{17}$ photons/s, in the $\gamma$-ray energy domain of $1 \leq \rm{E}_{\gamma} \leq 400$ MeV could be achieved. [...]
CERN-ACC-2018-155; CERN-PBC-CONF-2021-016.-
2018 - 3 p.
- Published in : 10.18429/JACoW-IPAC2018-THPMF015
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPMF015
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48.
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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. [...]
CERN-ACC-2018-161; CERN-PBC-CONF-2021-017.-
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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49.
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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. [...]
CERN-ACC-2018-164.-
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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50.
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Experimental Characterisation of a Fast Instability Linked to Losses in the 16L2 Cryogenic Half-Cell in the CERN LHC
/ Salvant, Benoit (CERN) ; Antipov, Sergey (CERN) ; Arduini, Gianluigi (CERN) ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Carver, Lee (CERN) ; Collier, Paul (CERN) ; Gorzawski, Arkadiusz (CERN) ; Höfle, Wolfgang (CERN) ; Iadarola, Giovanni (CERN) et al.
The operation during the summer months of the 2017 Run of the CERN LHC was plagued with fast beam losses that repeatedly occurred in the 16th arc half-cell at the left of IP2 as well as in the collimation insertion, leading to unwanted beam dumps. Transverse coherent oscillations were observed during this fast process. [...]
CERN-ACC-2018-175.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-THPAF058
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAF058
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