CERN Accelerating science

Projects, Upgrade and Consolidation Projects

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2016-01-27
09:48
MD 754: Instability Threshold for Train with 25ns Spacing / Carver, Lee Robert (CERN) ; Astapovych, Daria ; Biancacci, Nicolo (CERN) ; Iadarola, Giovanni (CERN) ; Levens, Tom (University of Glasgow (GB)) ; Metral, Elias (CERN) ; Salvant, Benoit (CERN) ; Wang, Na
Measurements made since the beginning of run II at 6.5 TeV have shown that there is a large discrepancy in the instability thresholds between single bunches and trains of 72 bunches with 25ns spacing, whereas the same result is expect for pure impedance-induced instabilities. [...]
CERN-ACC-NOTE-2016-0022.
- 2016. - 9 p.
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2016-01-26
17:09
Nine years of carbon coating development for the SPS upgrade: achievements and heritage. / Taborelli, Mauro (CERN) ; Chiggiato, Paolo (CERN) ; Costa Pinto, Pedro (CERN) ; Cruikshank, Paul (CERN)
CERN has succeeded in producing carbon coatings that eradicate electron cloud in accelerators without any beam conditioning or in situ heating [...]
CERN-ACC-2016-0010.
- 2015. - 20 p.
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2016-01-18
10:37
TCDQ-TCT retraction and losses during asynchronous beam dump / Bracco, Chiara (CERN) ; Bruce, Roderik (CERN) ; Quaranta, Elena (Politecnico di Milano (IT))
The protection provided by the TCDQs in case of asynchronous beam dump depends strongly on their correct setup. [...]
CERN-ACC-NOTE-2016-0017.
- 2016. - 15 p.
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2015-12-14
15:27
Collimation Cleaning at the LHC with Advanced Secondary Collimator Materials / Quaranta, Elena (CERN) ; Bruce, Roderik (CERN) ; Mereghetti, Alessio (CERN) ; Redaelli, Stefano (CERN) ; Rossi, A (CERN)
The LHC collimation system must ensure efficient beam halo cleaning in all machine conditions. The first run in 2010-2013 showed that the LHC performance may be limited by collimator material-related concerns, such as the contribution from the present carbon-based secondary collimators to the machine impedance and, consequently, to the beam instability. [...]
CERN-ACC-2015-0195.- Geneva : CERN, 2015 - 4 p. Fulltext: PDF;
In : 6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.2068-2071

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2015-12-14
11:26
Design and Prototyping of a 400 MHz RF-dipole Crabbing Cavity for the LHC High-Luminosity Upgrade / De Silva, S U (Old Dominion U.) ; Park, H (Old Dominion U.) ; Delayen, J R (Old Dominion U.) ; Li, Z (SLAC) ; Nicol, T H (Fermilab)
LHC High Luminosity Upgrade is in need of two crabbing systems that deflects the beam in both horizontal and vertical planes. The 400 MHz rf-dipole crabbing cavity system is capable of crabbing the proton beam in both planes. [...]
CERN-ACC-2015-0185.- Geneva : CERN, 2015 - 4 p. Fulltext: PDF;
In : 6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.3568-3571

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2015-12-14
11:15
FPC and Hi-Pass Filter HOM Coupler Design for the RF Dipole Crab Cavity for the LHC HiLumi Upgrade / Li, Z (SLAC) ; Delayen, Jean Roger (Old Dominion U.) ; De Silva, S U (Old Dominion U.) ; Park, HyeKyoung (Old Dominion U.) ; Olave, R G (Old Dominion U.) /SLAC, ODU Collaboration
A 400-MHz compact RF dipole (RFD) crab cavity design was jointly developed by Old Dominion University and SLAC under the support of US LARP program for the LHC HiLumi upgrade. The RFD cavity design is consisted of a rounded-square tank and two ridged deflecting poles, operating with a TE11-like dipole mode, which is the lowest mode of the cavity. [...]
CERN-ACC-2015-0184.- Geneva : CERN, 2015 - 4 p. Fulltext: PDF;
In : 6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.3492-3495

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2015-12-14
10:37
Design and Prototyping of HL-LHC Double Quarter Wave Crab Cavities for SPS Test / Verdú-Andrés, S (Brookhaven) ; Skaritka, J (Brookhaven) ; Wu, Q (Brookhaven) ; Xiao, B P (Brookhaven) ; Belomestnykh, S (Brookhaven ; Stony Brook U.) ; Ben-Zv, I (Brookhaven ; Stony Brook U.) ; Alberty, L (CERN) ; Artoos, Kurt (CERN) ; Calaga, Rama (CERN) ; Capatina, Ofelia (CERN) et al.
The LHC high luminosity project envisages the use of the crabbing technique for increasing and levelling the LHC luminosity. Double Quarter Wave (DQW) resonators are compact cavities especially designed to meet the technical and performance requirements for LHC beam crabbing. [...]
CERN-ACC-2015-0183.- Geneva : CERN, 2015 - 3 p. Fulltext: PDF;
In : 6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.64-66

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2015-12-14
09:38
Analytical Approach to the Beam-Beam Interaction with the Hourglass Effect / Crouch, Matthew (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Muratori, B D (Cockcroft Inst. Accel. Sci. Tech. ; Daresbury) ; Appleby, Robert Barrie (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.)
The hourglass effect arises due to a coupling between the longitudinal and transverse bunch planes. This coupling will result in a charge density distribution that will vary parabolically through the Interaction Point (IP). [...]
CERN-ACC-2015-0181.- Geneva : CERN, 2015 - 4 p. Fulltext: PDF;
In : 6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.510-513

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2015-12-14
00:52
An Alternative High Luminosity LHC with Flat Optics and Long-Range Beam-Beam Compensation / Fartoukh, Stephane (CERN) ; Valishev, Aleksander (Fermilab) ; Shatilov, Dmitry (Novosibirsk, IYF)
In the baseline scenario of the High-Luminosity LHC (HL-LHC), the geometric loss of luminosity in the two high luminosity experiments due to collisions with a large crossing angle is recovered by tilting the bunches in the interaction region with the use of crab cavities. A possible backup scenario would rely on a reduced crossing angle together with flat optics (with different horizontal and vertical β∗ values) for the preservation of luminosity performance. [...]
CERN-ACC-2015-0180.- Geneva : CERN, 2015 - 4 p. Fulltext: PDF;
In : 6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.2199-2202

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2015-12-10
15:01
Strong-Strong Beam-Beam Simulation of Bunch Length Splitting at the LHC / Qiang, J (LBNL, Berkeley) ; Paret, S (LBNL, Berkeley) ; Pieloni, Tatiana (CERN) ; Ohmi, Kazuhito (KEK, Tsukuba)
Longitudinal bunch length splitting was observed for some LHC beams. In this paper, we will report on the study of the observation using strong-strong beam-beam simulations. [...]
CERN-ACC-2015-0179.- Geneva : CERN, 2015 - 4 p. Fulltext: PDF;
In : 6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.2210-2213

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