CERN Accelerating science

SPS and CNGS

Senast inlagda poster:
2018-02-16
06:53
Space charge driven beam loss for cooled beams and mitigation measures in the CERN Low Energy Ion Ring / Bartosik, Hannes (CERN) ; Hancock, Steven (CERN) ; Huschauer, Alexander (CERN) ; Kain, Verena (CERN)
The performance of the CERN Low Energy Ion Ring (LEIR) with electron cooled lead ion beams is presently limited by losses, which occur during RF capture and the first part of acceleration. Extensive experimental studies performed in 2015 indicate that the losses are caused by the interplay of betatron resonances and the direct space charge detuning, which is significantly enhanced during bunching. [...]
2016 - 6 p. - Published in : 10.18429/JACoW-HB2016-TUAM5X01 Fulltext: PDF;
In : 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Malmö, Sweden, 3 - 8 Jul 2016, pp.TUAM5X01

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2018-02-15
06:04
Identification and reduction of the CERN SPS impedance / Shaposhnikova, Elena (CERN) ; Argyropoulos, Theodoros (CERN) ; Bohl, Thomas (CERN) ; Lasheen, Alexandre (CERN) ; Repond, Joël (CERN) ; Timko, Helga (CERN)
The first SPS impedance reduction programme has been completed in 2001, preparing the ring for its role as an injector of the LHC. This action has eliminated microwave instability on the SPS flat bottom and later nominal beam could be delivered to the LHC. [...]
2016 - 6 p. - Published in : 10.18429/JACoW-HB2016-TUAM3X01 Fulltext: PDF;
In : 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Malmö, Sweden, 3 - 8 Jul 2016, pp.TUAM3X01

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2018-02-15
06:04
The new HL-LHC injection and transport protection system / Velotti, Francesco (CERN ; EPFL, Lausanne, LPTP) ; Bartmann, Wolfgang (CERN) ; Bracco, Chiara (CERN) ; Fraser, Matthew (CERN) ; Goddard, Brennan (CERN) ; Kain, Verena (CERN) ; Lechner, Anton (CERN) ; Meddahi, Malika (CERN)
The High-Luminosity LHC (HL-LHC) upgrade represents a challenge for the full chain of its injectors. The aim is to provide beams with a brightness a factor of two higher than the present maximum achieved. [...]
2016 - 6 p. - Published in : 10.18429/JACoW-HB2016-MOPR012 Fulltext: PDF;
In : 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Malmö, Sweden, 3 - 8 Jul 2016, pp.MOPR012

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2018-02-15
06:04
The SPS 200 MHz TWC impedance after the LIU upgrade / Roggen, Toon (CERN) ; Calaga, Rama (CERN) ; Caspers, Fritz (CERN) ; Kaltenbacher, Thomas (CERN) ; Vollinger, Christine (CERN)
As a part of the LHC Injectors Upgrade project (LIU) the 200 MHz Travelling Wave Cavities (TWC) of the Super Proton Synchrotron (SPS) will be upgraded. The two existing five-section cavities will be rearranged into four three-section cavities (using two existing spare sections), thereby increasing the total voltage from 7 MV (I$_{RF}$ = 1.5 A) to 10 MV (I$_{RF}$ = 3.0 A). [...]
2016 - 5 p. - Published in : 10.18429/JACoW-HB2016-MOPR011 Fulltext: PDF;
In : 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Malmö, Sweden, 3 - 8 Jul 2016, pp.MOPR011

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2018-02-15
06:04
Machine element contribution to the longitudinal impedance model of the CERN SPS / Kaltenbacher, Thomas (CERN) ; Caspers, Fritz (CERN) ; Vollinger, Christine (CERN)
This contribution describes the current longitudinal impedance model of the SPS and studies carried out in order to improve, extend and update it. Specifically, new sources of impedances have been identified, evaluated and included in the model. [...]
2016 - 5 p. - Published in : 10.18429/JACoW-HB2016-MOPR010 Fulltext: PDF;
In : 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Malmö, Sweden, 3 - 8 Jul 2016, pp.MOPR010

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2018-02-15
06:04
Emittance reconstruction techniques in presence of space charge applied during the Linac4 beam commissioning / Dimov, Veliko (CERN) ; Gaur, Rahul (Raja Ramanna Ctr.) ; Lallement, Jean-Baptiste (CERN) ; Lombardi, Alessandra (CERN)
The classical emittance reconstruction technique, based on analytic calculations using transfer matrices and beam profile measurements, is reliable only if the emittance is conserved and the space charge forces are negligible in the beamline between the reconstruction and measurement points. The effects of space charge forces prevent this method from giving sound results up to a relativistic beta of about 0.5 and make it inapplicable to the Linac4 commissioning at 50 and 100 MeV. [...]
2016 - 6 p. - Published in : 10.18429/JACoW-HB2016-WEPM1Y01 Fulltext: PDF;
In : 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Malmö, Sweden, 3 - 8 Jul 2016, pp.WEPM1Y01

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2018-02-13
06:31
R2e – Experience And Outlook / Brugger, M (CERN) ; Calviani, M (CERN) ; Garcia Alia, R (CERN) ; Mekki, J (CERN) ; Spiezia, G (CERN)
The period before 2011 and 2012 LHC operation involved several mitigation actions related to R2E (" Radiation to Electronics ") project [1] aiming at keeping SEE (" Single Event Effect ") failures at an acceptable rate. In this respect, 2012 very successful LHC operation has continued to provide valuable inputs for the detailed analysis of radiation levels and radiation induced equipment failures, confirming the estimates provided in Chamonix 2012. Radiation levels around LHC critical areas and the LHC tunnel were studied in detail and compared both to available 2011 measurements and previous simulation results, as well as put in perspective to future LHC operation parameters. Observed radiation induced failures were continuously analysed and addressed through early relocation measures and patch-solutions on the equipment level whenever required and/or possible. [...]
Geneva : CERN, 2012 - 6 p. - Published in : (2012) , pp. 13-18 Fulltext: PDF;
In : 4th Evian Workshop on LHC beam operation, Evian-les-Bains, France, 17 - 20 Dec 2012, pp.13-18

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2018-02-13
06:31
HIE-ISOLDE SC Linac progress and commissioning in 2016 / Venturini Delsolaro, Walter (CERN) ; Bravin, Enrico (CERN) ; Delruelle, Nicolas (CERN) ; Elias, Michal (CERN) ; Fadakis, Eleftherios (CERN) ; Ferreira Somoza, Jose (CERN) ; Formenti, Fabio (CERN) ; Fraser, Matthew (CERN) ; Gayde, Jean-Christophe (CERN) ; Guillotin, Nicolas (CERN) et al.
After the first successful physics run with radioactive ion beams at HIE ISOLDE, in October 2015 [1], the staged deployment of the linac continued in 2016 by adding a second cryomodule and by refurbishing the first one. During the physics run with one cryomodule, the second cryomodule was being assembled. [...]
2017 - 5 p. - Published in : 10.18429/JACoW-LINAC2016-WE1A05 Fulltext: PDF;
In : 28th Linear Accelerator Conference, East Lansing, Michigan, 25 - 30 Sep 2016, pp.WE1A05

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2018-02-13
06:31
S-band booster design and emittance preservation for the Awake $e^-$ injector / Mete Apsimon, Oznur (Lancaster U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Apsimon, Robert (Lancaster U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Burt, Graeme (Lancaster U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Döbert, Steffen (CERN) ; Xia, Guoxing (U. Manchester (main) ; Cockcroft Inst. Accel. Sci. Tech.)
AWAKE is a proton driven plasma wakefield acceleration experiment at CERN which uses the protons from the SPS. It aims to study the self modulation instability of a proton bunch and the acceleration of an externally injected electron beam in the plasma wakefields, during the so called Phase II until the technical stop of LHC and its injector chain (LS2) in 2019. [...]
2017 - 3 p. - Published in : 10.18429/JACoW-LINAC2016-TUPRC016 Fulltext: PDF;
In : 28th Linear Accelerator Conference, East Lansing, Michigan, 25 - 30 Sep 2016, pp.TUPRC016

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2018-02-06
14:08
On-line control of the CERN Proton Synchrotron closed orbit at injection / Van der Beken ; Burnod, L ; Daneels, A
CERN-MPS-SI-CO-71-4.
- 1971. - 4 p.
Full text

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