CERN Accelerating science

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2018-11-21
14:13
TDIS pressure profile simulations after LS2 / Ribes Metidieri, Patricia (University of Barcelona (ES)) ; Yin Vallgren, Christina (CERN) ; Skripka, Galina (CERN) ; Iadarola, Giovanni (CERN) ; Bregliozzi, Giuseppe (CERN)
During the LS2 (Long Shutdown 2), the current TDI (Beam Absorber for Injection) will be replaced by the new so called, TDIS (Beam Absorber for Injection Segmented). [...]
CERN-ACC-NOTE-2018-0075.
- 2018. - 18 p.
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2018-11-21
06:48
LEIR Injection Efficiency Studies as a Function of the Beam Energy Distribution from Linac3 / Hirlaender, Simon (CERN) ; Alemany-Fernández, Reyes (CERN) ; Bartosik, Hannes (CERN) ; Bellodi, Giulia (CERN) ; Biancacci, Nicolo (CERN) ; Kain, Verena (CERN) ; Scrivens, Richard (CERN)
High intensities in the CERN Low Energy Ion Ring (LEIR) are achieved using multi-turn injections from the pre-accelerator Linac3 combined with simultaneous stacking in momentum and transverse phase spaces. Up to seven consecutive 200 $\mu$s long, 200 ms spaced pulses are injected from Linac3 into LEIR by stacking each of them into the six-dimensional phase-space over 70 turns. [...]
2018 - 3 p. - Published in : 10.18429/JACoW-IPAC2018-TUPAF034 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF034

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2018-11-21
06:48
Impedance and Instability Studies in LEIR with Xenon / Biancacci, Nicolo (CERN) ; Bartosik, Hannes (CERN) ; Gąsior, Marek (CERN) ; Hirlaender, Simon (CERN) ; Latina, A (CERN) ; Levens, Thomas (CERN) ; Migliorati, Mauro (U. Rome La Sapienza (main) ; INFN, Rome) ; Métral, Elias (CERN)
In 2017, the LEIR accelerator has been operated with $Xe^{39+}$ beam for fixed target experiments in the SPS North Area. The different ion species, with respect to the standard $Pb^{34+}$, allowed for additional comparative measurements of tune shift versus intensity at injection energy both in coasting and bunched beams. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-TUPAF024 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF024

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2018-11-21
06:48
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. [...]
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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2018-11-21
06:48
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. [...]
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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2018-11-21
06:48
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. [...]
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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2018-11-21
06:48
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. [...]
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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2018-11-21
06:48
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. [...]
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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2018-11-21
06:48
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. [...]
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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2018-11-20
06:11
Dependency of the capture of field emitted electron on the phase velocity of a high-frequency accelerating structure / Lucas, Thomas Geoffrey ; Argyopolous, Theodorous ; Boland, Mark James ; Catalan-Lasheras, Nuria ; Rassool, Roger Paul ; Serpico, Claudio ; Volpi, Matteo ; Wuensch, Walter (CERN)
Surface electric fields within high gradient linear accelerators can exceed 200 MV/m and lead to field emitted (FE) electrons entering the structure. When the accelerating field conditions permit, these FE electrons can become captured in the RF fields and be transported through the accelerating structure as a dark current. [...]
2019 - 7 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 914 (2019) 46-52 Fulltext: PDF;

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