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Projects, Upgrade and Consolidation Projects

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2017-05-24
09:29
THERMOPHYSICAL AND MECHANICAL CHARACTERIZATION OF ADVANCED MATERIALS FOR THE LHC COLLIMATION SYSTEM / Bianchi, Laura (Universita & INFN, Pisa (IT))
The aim of the thesis is to describe the methods employed for the thermo-physical and mechanical characterization and to show the results of the campaign conducted over two ceramic matrix composites, CFC FS140® and MG-6403-Fc, which are candidates as jaws materials in the LHC collimation system. [...]
CERN-ACC-NOTE-2017-0038. - 2017. - 133 p.

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2017-04-03
14:39
Measurement Report for the PS-boosterWire Scanner / Vollinger, Christine (CERN) ; Kaltenbacher, Thomas Roland (Universitaet Bern (CH)) ; Kramer, Patrick (Rheinisch-Westfaelische Tech. Hoch. (DE))
This Note discusses the EM-measurements carried out on the prototype of the PS-Booster wire scanner. [...]
CERN-ACC-NOTE-2017-0022. - 2017. - 4 p.
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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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2017-01-19
18:14
ATS MD’s in 2016 / Fartoukh, Stephane (CERN) ; Albert, Markus (CERN) ; Le Borgne, Yannick (CERN) ; Bracco, Chiara (CERN) ; Bruce, Roderik (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Garcia-Tabares Valdivieso, Ana (Ministere des affaires etrangeres et europeennes (FR)) ; Fuchsberger, Kajetan (CERN) ; Giachino, Rossano (CERN) et al.
This report presents a summary of the Achromatic Telescopic Squeezing (ATS) scheme related activities which took place in 2016, where a new generation of ATS pre-squeezed and telescopic optics was successfully probed, namely: (i) down to a beta* of 10 cm with pilot bunches, and (ii) with more emphasis at intermediate beta* values of 40 cm or 33 cm where collisions were established with nominal bunches, the triplet aperture was measured and collimation measurements with pre-squeezed or moderately telescopic ATS optics were conducted..
CERN-ACC-2017-0003. - 2016. - 25 p.
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2017-01-16
16:04
MD 1266: Injection of "high performance reach" 80b 25 ns beam / Bartmann, Wolfgang (CERN) ; Fraser, Matthew Alexander (CERN) ; Iadarola, Giovanni (CERN) ; Kain, Verena (CERN) ; Velotti, Francesco Maria (CERN) ; Muller, Jeremy Alfred
This note summarises the measurements and observations performed during the LHC Machine Development concerning the injection of batches of 80 bunches for future “high performance reach” of the LHC [...]
CERN-ACC-NOTE-2017-0003. - 2017. - 9 p.
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2017-01-16
15:58
MD 1242: Injection and emittance preservation / Bartosik, Hannes (CERN) ; Bravin, Enrico (CERN) ; Iadarola, Giovanni (CERN) ; Kain, Verena (CERN) ; Trad, Georges (CERN) ; Velotti, Francesco Maria (CERN)
This note summarises the measurements and observations performed during the LHC Machine Development concerning the injection and emittance preservation studies with BCMS beam [...]
CERN-ACC-NOTE-2017-0002. - 2017. - 9 p.
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2016-12-14
09:45
Longitudinal Space Charge in the SPS / Lasheen, Alexandre (CERN)
Longitudinal instabilities due to the SPS beam coupling impedance are a major issue for future projects and it is essential to have an accurate SPS impedance model to study them. [...]
CERN-ACC-NOTE-2016-0074. - 2016.
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2016-12-06
17:23
Conceptual design report on a charge breeder for HIE-ISOLDE / Shornikov, Andrey (CERN) ; Beebe, Edward (Brookhaven) ; Breitenfeldt, Martin (CERN) ; Pitters, Johanna (CERN) ; Mertzig, Robert (CERN) ; Pikin, Alexander (Brookhaven) ; Wenander, Fredrik (CERN)
In this conceptual design report the possible options for an upgrade of the REX/HIE-ISOLDE charge breeder are discussed. [...]
CERN-ACC-NOTE-2016-0073 ; arXiv:1701.00687. - 2016. - 35 p.
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2016-12-02
17:20
Parameters for aperture calculations at injection for HL-LHC* / Bruce, Roderik (CERN) ; Bracco, Chiara (CERN) ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN) ; Redaelli, Stefano (CERN) ; Tomas Garcia, Rogelio (CERN) ; Velotti, Francesco Maria (CERN) ; Wenninger, Jorg (CERN)
Accurate evaluations of the margins of available aperture in the LHC and HL-LHC are very important, in order to judge if proposed optics and hardware are adequate, and to push the machine performance. [...]
CERN-ACC-2016-0328. - 2016. - 25 p.
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2016-10-26
11:21
Cavity Voltage Phase Modulation MD / Mastoridis, Themistoklis (California Polytechnic State Univ. (US)) ; Baudrenghien, Philippe (CERN) ; Molendijk, John (CERN) ; Timko, Helga (CERN)
The LHC RF/LLRF system is currently configured for extremely stable RF voltage to minimize transient beam loading effects. [...]
CERN-ACC-NOTE-2016-0061. - 2016. - 6 p.
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