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SPS Slow Extraction Losses and Activation: Challenges and Possibilities for Improvement
/ Fraser, Matthew (CERN) ; Balhan, Bruno (CERN) ; Bartosik, Hannes (CERN) ; Bertone, Caterina (CERN) ; Björkman, Daniel (CERN) ; Borburgh, Jan (CERN) ; Conan, Nadine (CERN) ; Cornelis, Karel (CERN) ; Garcia Alia, Ruben (CERN) ; Gatignon, Laurent (CERN) et al.
In 2015 the highest integrated number of protons in the history of the North Area was slow extracted from the CERN Super Proton Synchrotron (SPS) for the Fixed Target physics programme. At well over 1.10¹⁹ protons on target (POT), this represented the highest annual figure at SPS for almost two decades, since the West Area Neutrino Facility was operational some 20 years ago. [...]
CERN-ACC-2017-123.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-MOPIK045
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOPIK045
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2.
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SPS slow extraction losses and activation: update on recent improvements
/ Fraser, Matthew (CERN) ; Balhan, Bruno (CERN) ; Barna, Daniel (Wigner RCP, Budapest) ; Bartosik, Hannes (CERN) ; Bernhard, Johannes (CERN) ; Bertone, Caterina (CERN) ; Björkman, Daniel (CERN) ; Borburgh, Jan (CERN) ; Brugger, Markus (CERN) ; Brunner, Kristóf (Wigner RCP, Budapest) et al.
Annual high intensity requests of over $1 \times 10^{19}$ protons on target (POT) from the CERN Super Proton Synchrotron (SPS) Fixed Target (FT) physics program continue, with the prospect of requests for even higher, unprecedented levels in the coming decade. A concerted and multifaceted R&D; effort has been launched to understand and reduce the slow extraction induced radioactivation of the SPS and to anticipate future experimental proposals, such as SHiP [1] at the SPS Beam Dump Facility (BDF) [2], which will request an additional $4 \times 10^{19}$ POT per year. [...]
CERN-PBC-CONF-2021-002; CERN-ACC-2019-199.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-WEPMP031
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP031
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3.
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Alternative material choices to reduce activation of extraction equipment
/ Björkman, Daniel (CERN) ; Balhan, Bruno (CERN) ; Borburgh, Jan (CERN) ; Esposito, Luigi Salvatore (CERN) ; Fraser, Matthew (CERN) ; Goddard, Brennan (CERN) ; Stoel, Linda (CERN) ; Vincke, Helmut (CERN)
At CERN, the Super Proton Synchrotron (SPS) is equipped with a resonant slow extraction system in Long Straight Section 2 (LSS2) towards the fixed target (FT) beam lines in the North Area. The extraction region provides the physics experiments with a quasi-DC flux of high-energy protons over a few seconds, which corresponds to tens of thousands of turns. [...]
CERN-ACC-2019-183.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-WEPMP024
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP024
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4.
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Optimization of Diffuser (Pre-Scatterer) Configurations for Slow Extraction Loss Reduction at Electrostatic Septa
/ Goddard, Brennan (CERN) ; Balhan, Bruno (CERN) ; Barna, Daniel (Wigner RCP, Budapest) ; Borburgh, Jan (CERN) ; Fraser, Matthew (CERN) ; Jorat, Louise Olivia (CERN) ; Kain, Verena (CERN) ; Lolliot, Christophe (CERN) ; Nagaslaev, Vladimir (Fermilab) ; Stoel, Linda (CERN) et al.
Uncontrolled beam loss at the electrostatic septum is a performance limit for several existing or planned high power hadron accelerators delivering slow-extracted spills to fixed targets. A passive diffuser, or pre-scatterer, in a suitable configuration has been shown to reduce such beamloss significantly, with the actual gain factor depending on the parameters and details of the extraction process and hardware. [...]
FERMILAB-CONF-18-456-AD.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-TUPAF053
Fulltext: fermilab-conf-18-456-ad - PDF; tupaf053 - PDF; External link: FERMILABCONF
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF053
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5.
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The Use of a Passive Scatterer for SPS Slow Extraction Beam Loss Reduction
/ Goddard, Brennan (CERN) ; Balhan, Bruno (CERN) ; Borburgh, Jan (CERN) ; Fraser, Matthew (CERN) ; Stoel, Linda (CERN) ; Velotti, Francesco (CERN)
A significant reduction in the fraction of protons lost on the SPS electrostatic septum ES during resonant slow extraction is highly desirable for present Fixed-Target beam operation, and will become mandatory for the proposed SHiP experiment, which is now being studied in the framework of CERN's Physics Beyond Colliders program. In this paper the possible use of a passive scattering device (diffuser) is investigated. [...]
CERN-ACC-2017-124.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-MOPIK044
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOPIK044
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6.
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Modelling the Radioactivity Induced by Slow-Extraction Losses in the CERN SPS
/ Fraser, Matthew (CERN) ; Björkman, Daniel (CERN) ; Cornelis, Karel (CERN) ; Goddard, Brennan (CERN) ; Kain, Verena (CERN) ; Schicho, Philipp (CERN) ; Theis, Christian (CERN) ; Vincke, Helmut (CERN)
Resonant slow extraction is used to provide an intense quasi-DC flux of high-energy protons for the Fixed Target (FT) physics programme at the CERN Super Proton Synchrotron (SPS). The unavoidable beam loss intrinsic to the extraction process activates the extraction region and its equipment. [...]
CERN-ACC-2017-137.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-TUPIK086
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPIK086
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7.
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Upgrade of the CERN SPS Extraction Protection Elements TPS
/ Borburgh, Jan (CERN) ; Balhan, Bruno (CERN) ; Barnes, Michael (CERN) ; Baud, Cedric (CERN) ; Fraser, Matthew (CERN) ; Kain, Verena (CERN) ; Maciariello, Fausto (CERN) ; Steele, Genevieve (CERN) ; Velotti, Francesco (CERN)
In 2006 the protection devices upstream of the septa in both extraction channels of the CERN SPS to the LHC were installed. Since then, new beam parameters have been proposed for the SPS beam towards the LHC in the framework of the LIU project. [...]
2015 - 4 p.
- Published in : 10.18429/JACoW-IPAC2015-WEPMN068
Fulltext: PDF; External link: Full-text at JACoW Server
In : 6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.WEPMN068
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8.
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Phase Space Folding Studies for Beam Loss Reduction During Resonant Slow Extraction at the CERN SPS
/ Stoel, Linda (CERN) ; Benedikt, Michael (CERN) ; Cornelis, Karel (CERN) ; Fraser, Matthew (CERN) ; Goddard, Brennan (CERN) ; Kain, Verena (CERN) ; Velotti, Francesco (CERN)
The requested number of protons slow-extracted from the CERN Super Proton Synchrotron (SPS) for Fixed Target (FT) physics is expected to continue increasing in the coming years, especially if the proposed SPS Beam Dump Facility is realised. Limits on the extracted intensity are already being considered to mitigate the dose to personnel during interventions required to maintain the extraction equipment, especially the electrostatic extraction septum. [...]
CERN-ACC-2017-122.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-MOPIK046
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOPIK046
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9.
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Slow extraction loss reduction with octupoles at the CERN SPS
/ Stoel, Linda (CERN) ; Bartosik, Hannes (CERN) ; Benedikt, Michael (CERN) ; Fraser, Matthew (CERN) ; Goddard, Brennan (CERN) ; Kain, Verena (CERN) ; Velotti, Francesco (CERN)
The powering of octupoles during third-integer resonant slow extraction has been studied and recently tested with beam at the CERN Super Proton Synchrotron (SPS) in order to increase the extraction efficiency and reduce the induced radioactivity of the extraction straight. The octupoles distort the particle trajectories in phase space in such a way that the extracted separatrix is folded, which decreases the particle density impinging the wires of the extraction septum at the expense of increasing the extracted beam emittance. [...]
CERN-ACC-2019-197.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-WEPMP033
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP033
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10.
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Characterisation of the SPS Slow-extraction Parameters
/ Velotti, Francesco (CERN) ; Bartmann, Wolfgang (CERN) ; Bohl, Thomas (CERN) ; Bracco, Chiara (CERN) ; Cornelis, Karel (CERN) ; Fraser, Matthew (CERN) ; Goddard, Brennan (CERN) ; Kain, Verena (CERN) ; Stoel, Linda (CERN)
The Super Proton Synchrotron (SPS) is the last accelerator in the Large Hadron Collider (LHC) injector chain but its main users are the fixed-target experiments located in the North Area (NA). The beams, which are among the most intense circulating in the SPS, are extracted to the NA over several thousands of turns by exploiting a third-integer resonant extraction. [...]
CERN-ACC-2016-134.-
2016 - 4 p.
- Published in : 10.18429/JACoW-IPAC2016-THPOR055
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPOR055
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