CERN Accelerating science

SPS and CNGS

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2019-10-17
06:46
Developments towards the delivery of selenium ion beams at ISOLDE / Chrysalidis, K (CERN ; Mainz U., Inst. Phys.) ; Ballof, J (CERN ; Mainz U., Inst. Kernchem.) ; Düllmann, Ch E (Mainz U., Inst. Kernchem. ; Helmholtz Inst., Mainz ; Darmstadt, GSI) ; Fedosseev, V N (CERN) ; Granados, C (CERN) ; Marsh, B A (CERN) ; Martinez Palenzuela, Y (CERN ; Leuven U.) ; Ramos, J P (CERN) ; Rothe, S (CERN) ; Stora, T (CERN) et al.
The production of selenium ion beams has been investigated at the CERN-ISOLDE facility via two different ionization methods. Whilst molecular selenium (SeCO) beams were produced at ISOLDE since the early 1990s, recent attempts at reliably reproducing these results have so far been unsuccessful. [...]
2019 - Published in : Eur. Phys. J. A 55 (2019) 173 Fulltext: PDF;

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2019-10-17
06:46
Design and construction of the CERN SPS extraction protection elements for LIU / Balhan, Bruno (CERN) ; Baud, Cedric (CERN) ; Borburgh, Jan (CERN) ; Fraser, Matthew (CERN) ; Hourican, Michael (CERN) ; Jorat, Louise Olivia (CERN) ; Nuiry, Francois-Xavier (CERN) ; Pianese, Stefano (CERN)
At CERN, the SPS synchrotron is equipped with two fast extraction channels towards the LHC. As a part of the LHC injector upgrade project (LIU), the protection devices upstream of the septa in both extraction channels will be upgraded. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPMP022 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP022

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2019-10-17
06:46
The new injection region of the CERN PS Booster / Weterings, Wim (CERN) ; Bracco, Chiara (CERN) ; Jorat, Louise Olivia (CERN) ; Meddahi, Malika (CERN) ; Noulibos, Remy (CERN) ; Van Trappen, Pieter (CERN)
During the Long Shutdown 2 (LS2) at CERN, the new Linac4 (L4) accelerator will be connected to the PS Booster (PSB) to inject 160 MeV H$^−$ beam into the 4 superposed PSB rings. In order to achieve this, we have designed, built and pre-assembled a completely new H$^−$ charge-exchange injection chicane system, with a carbon stripping foil unit to convert the negative hydrogen ions into protons by stripping off the electrons. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPMP039 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP039

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2019-10-17
06:46
Model and measurements of CERN-SPS slow extraction spill re-shaping - the burst mode slow extraction / Pari, Michelangelo (Padua U. ; INFN, Padua ; CERN) ; Fraser, Matthew (CERN) ; Goddard, Brennan (CERN) ; Kain, Verena (CERN) ; Stoel, Linda (CERN) ; Velotti, Francesco (CERN)
The ENUBET (Enhanced NeUtrino BEams from kaon Tagging) Project aims at reaching a new level of precision of the short-baseline neutrino cross section measurement by using an instrumented decay tunnel. The North Area (NA) experimental facility of the CERN Super Proton Synchrotron (SPS) offers the required infrastructure for the experiment. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPMP035 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP035

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2019-10-17
06:46
Characterisation of SPS slow extraction spill quality degradation / Velotti, Francesco (CERN) ; Bartosik, Hannes (CERN) ; Buzio, Marco (CERN) ; Cornelis, Karel (CERN) ; Di Capua, Vincenzo (CERN) ; Fraser, Matthew (CERN) ; Goddard, Brennan (CERN) ; Kain, Verena (CERN)
The main physics users of the Super Proton Synchrotron (SPS) are the experiments installed in the North Area (NA). They are supplied with slowly extracted protons or heavy ions, exploiting a third integer slow extraction to provide a 4.8 s spill. [...]
2019 - 3 p. - Published in : 10.18429/JACoW-IPAC2019-WEPMP034 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP034

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2019-10-17
06:46
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. [...]
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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2019-10-17
06:46
Tracking simulations of shadowing electrostatic septum wires by means of bent crystals / Velotti, Francesco (CERN) ; Fraser, Matthew (CERN) ; Goddard, Brennan (CERN) ; Kain, Verena (CERN) ; Stoel, Linda (CERN)
The CERN Super Proton Synchrotron (SPS) slow extraction is a third integer resonant extraction and hence suffers from high losses at the electrostatic septum (ZS). This is one of the main limiting factors for the maximum number of Protons On Target (POT) deliverable from the SPS to the North Area (NA). [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPMP032 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP032

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2019-10-17
06:46
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. [...]
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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2019-10-16
07:36
LHC optics measurement and correction software progress and plans / Tomás, Rogelio (CERN) ; Cardona, Javier (Colombia, U. Natl.) ; Carlier, Felix (CERN) ; Coello, Jaime (CERN) ; Dilly, Joschua (CERN) ; Fol, Elena (CERN) ; Garcia-Tabares, Ana (CERN) ; Hofer, Michael (CERN) ; Maclean, Ewen (CERN) ; Malina, Lukas (CERN) et al.
LHC Optics Measurements and Corrections (OMC) require efficient on-line software applications to acquire and analyze data and to compute the necessary corrections. During Run 2 various measurement and correction techniques have been merged to yield unprecedented optics quality, increasing the required number of steps to finalize the optics commissioning and the size of the software project. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPGW116 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPGW116

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2019-10-16
07:36
Commissioning of the prototype for a new gas curtain beam profile monitor using beam induced fluorescence for HL-LHC / Salehilashkajani, Amir (U. Liverpool (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Ady, Marton (CERN) ; Chritin, Nicolas (CERN) ; Forck, Peter (Darmstadt, GSI) ; Glutting, Johanna (CERN) ; Jones, Owain Rhodri (CERN) ; Kersevan, Roberto (CERN) ; Marriott-Dodington, Thomas (CERN) ; Mazzoni, Stefano (CERN) ; Rossi, Adriana (CERN) et al.
A new supersonic gas-jet curtain based beam profile monitor is under development for minimally invasive simultaneous transverse profile diagnostics of proton and electron beams, at pressures compatible with LHC. The monitor makes use of a thin gas-jet curtain angled at 45° with respect to the charged particle beams. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPGW093 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPGW093

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