CERN Accelerating science

Accelerator Physics

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2017-04-26
06:54
Long term dynamics of the high luminosity Large Hadron Collider with crab cavities / Barranco García, J (EPFL-ISIC, Lausanne ; CERN) ; De Maria, R (CERN) ; Grudiev, A (CERN) ; Tomás García, R (CERN) ; Appleby, R  B (Cockcroft Inst. Accel. Sci. Tech. ; Manchester U.) ; Brett, D  R (Cockcroft Inst. Accel. Sci. Tech. ; Manchester U.)
The High Luminosity upgrade of the Large Hadron Collider (HL-LHC) aims to achieve an integrated luminosity of 200–300  fb-1 per year, including the contribution from the upgrade of the injector chain. For the HL-LHC the larger crossing angle together with a smaller beta function at the collision point would result in more than 70% luminosity loss due to the incomplete geometric overlap of colliding bunches. [...]
2016 - 9 p. - Published in : Phys. Rev. Accel. Beams 19 (2016) 101003 Fulltext: PDF;

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2017-04-26
06:54
Probing half $β^*_y$ optics in the Accelerator Test Facility 2 / Patecki, M (CERN) ; Bett, D (CERN) ; Marin, E (CERN) ; Plassard, F (CERN) ; Tomás, R (CERN) ; Kubo, K (Sokendai, Tsukuba ; KEK, Tsukuba) ; Kuroda, S (Sokendai, Tsukuba ; KEK, Tsukuba) ; Naito, T (Sokendai, Tsukuba ; KEK, Tsukuba) ; Okugi, T (Sokendai, Tsukuba ; KEK, Tsukuba) ; Tauchi, T (Sokendai, Tsukuba ; KEK, Tsukuba) et al.
A nanometer beam size at the interaction point (IP) is required for future linear colliders to achieve the desired rate of particle collisions. KEK Accelerator Test Facility 2 (ATF2), a scaled down implementation of the linear collider beam delivery system, serves for demonstrating the feasibility of the final focus system (FFS). [...]
2016 - 9 p. - Published in : Phys. Rev. Accel. Beams 19 (2016) 101001 Fulltext: 10.1103_PhysRevAccelBeams.19.101001 - PDF; PhysRevAccelBeams.19 - PDF;

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2017-04-26
06:54
Utilizing the N beam position monitor method for turn-by-turn optics measurements / Langner, A (CERN ; Hamburg U.) ; Benedetti, G (ATIPIC) ; Carlà, M (ATIPIC) ; Iriso, U (ATIPIC) ; Martí, Z (ATIPIC) ; de Portugal, J Coello (CERN) ; Tomás, R (CERN)
The N beam position monitor method (N-BPM) which was recently developed for the LHC has significantly improved the precision of optics measurements that are based on BPM turn-by-turn data. The main improvement is due to the consideration of correlations for statistical and systematic error sources, as well as increasing the amount of BPM combinations which are used to derive the β-function at one location. [...]
2016 - 6 p. - Published in : Phys. Rev. Accel. Beams 19 (2016) 092803 Fulltext: PDF;

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2017-04-25
09:25
MD468: Electron Cloud Reference Fills and Dependence on the Bunch Intensity / Iadarola, Giovanni (CERN) ; Dijkstal, Philipp (Technische Universitaet Darmstadt (DE)) ; Mether, Lotta (Ecole Polytechnique Federale de Lausanne (CH)) ; Romano, Annalisa (Technische Universitaet Darmstadt (DE)) ; Rumolo, Giovanni (CERN)
This note describes a Machine Development session performed to investigate the dependence of e-cloud build-up and instabilities on the bunch population of the circulating beam. [...]
CERN-ACC-NOTE-2017-0029.
- 2017.

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2017-04-25
09:01
MD 1856 - Landau Damping: Beam Transfer Functions and diffusion mechanisms / Tambasco, Claudia (Ecole Polytechnique Federale de Lausanne (CH)) ; Barranco Garcia, Javier (Ecole Polytechnique Federale de Lausanne (CH)) ; Boccardi, Andrea (CERN) ; Buffat, Xavier (CERN) ; Gasior, Marek (CERN) ; Lefevre, Thibaut (CERN) ; Levens, Tom (University of Glasgow (GB)) ; Pojer, Mirko (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Solfaroli Camillocci, Matteo (CERN) et al.
In the 2012, 2015 and 2016 several instabilities were developing during the betatron squeeze where beam-beam interactions become stronger modifying the tune spread provided by the octupoles magnets. [...]
CERN-ACC-NOTE-2017-0027.
- 2017.
Full text

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2017-04-25
08:53
MD 1407 - Landau Damping: Beam Transfer Functions and diffusion mechanisms / Tambasco, Claudia (Ecole Polytechnique Federale de Lausanne (CH)) ; Barranco Garcia, Javier (Ecole Polytechnique Federale de Lausanne (CH)) ; Boccardi, Andrea (CERN) ; Buffat, Xavier (CERN) ; Gasior, Marek (CERN) ; Lefevre, Thibaut (CERN) ; Levens, Tom (University of Glasgow (GB)) ; Pojer, Mirko (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Solfaroli Camillocci, Matteo (CERN) et al.
In the 2012, 2015 and 2016 run several instabilities were developing at flat-top, during and at the end of the betatron squeeze where beam-beam interactions are present. [...]
CERN-ACC-NOTE-2017-0026.
- 2017.
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2017-04-12
09:05
Beam cleaning of the incoming beam in experimental IRs in HL-LHC / Garcia Morales, Hector (University of London (GB)) ; Bruce, Roderik (CERN) ; Redaelli, Stefano (CERN) ; De Maria, Riccardo (CERN)
The HL-LHC will store 675 MJ of energy per beam, about 300 MJ more than the nominal LHC. [...]
CERN-ACC-NOTE-2017-0023.
- 2017. - 13 p.
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2017-04-07
07:44
The Two-Screen Measurement Setup to Indirectly Measure Proton Beam Self-Modulation in AWAKE / Turner, Marlene (CERN ; Graz, Tech. U.) ; Biskup, B. (CERN ; Prague, Tech. U.) ; Burger, S. (CERN) ; Gschwendtner, E. (CERN) ; Mazzoni, S. (CERN) ; Petrenko, A. (CERN)
The goal of the first phase of the AWAKE experiment at CERN is to measure the self-modulation of the $\sigma_z = 12\,\rm{cm}$ long SPS proton bunch into microbunches after traversing $10\,\rm{m}$ of plasma with a plasma density of $n_{pe}=7\times10^{14}\,\rm{electrons/cm}^3$. The two screen measurement setup is a proton beam diagnostic that can indirectly prove the successful development of the self-modulation of the proton beam by imaging protons that got defocused by the transverse plasma wakefields after passing through the plasma, at two locations downstream the end of the plasma. [...]
arXiv:1702.06307.- 2017 - 7 p. - Published in : Nucl.Instrum.Meth. A854 (2017) 100-106 Fulltext: arXiv:1702.06307 - PDF; 10.1016_j.nima.2017.02.064 - PDF;

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2017-03-30
11:33
LHC MD 652: Coupled-Bunch Instability with Smaller Emittance (all HOMs) / Esteban Muller, Juan ; shaposhnikova, Elena (CERN) ; Timko, Helga (CERN)
The aim of the MD was to measure the coupled-bunch stability from all HOM impedances, with a reduced longitudinal emittance in order to explore the HL-LHC conditions. [...]
CERN-ACC-NOTE-2017-0017.
- 2017. - 6 p.
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2017-03-29
15:39
Summary of Impedance Issues and Beam Instabilities : Proc. eeFACT2016 Daresbury, UK, October 2016 / Zimmermann, Frank (CERN)
This paper summarizes the session on impedance issues and beam instabilities at the ICFA workshop on future circular electron-positron factories "eeFACT2016" held at the Cockcroft Institute, Daresbury, from 24 to 27 October 2016. This session also covered active beam stabilization by feedback systems. [...]
CERN-ACC-2017-0012.- Geneva : CERN, 2017 - Published in : Fulltext: PDF;
In : 58th ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e-Colliders , Daresbury, United Kingdom, 24 - 27 Oct 2016

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