Author: Bartmann, W.
Paper Title Page
MOPFI050 Non-local Fast Extraction from the CERN SPS at 100 and 440 GeV 392
 
  • F.M. Velotti, A. Alekou, W. Bartmann, E. Carlier, K. Cornelis, I. Efthymiopoulos, B. Goddard, L.K. Jensen, V. Kain, M. Kowalska, V. Mertens, R. Steerenberg
    CERN, Geneva, Switzerland
  
  The Long Straight Sec­tion 2 (LSS2) of the CERN SPS is con­nected with the North Area (NA), to which the beam to date has al­ways been ex­tracted using a res­o­nant ex­trac­tion tech­nique. For new pro­posed short- and long-base­line neu­trino ex­per­i­ments, a fast sin­gle turn ex­trac­tion to this ex­per­i­men­tal area is re­quired. As there are no kick­ers in LSS2, and the in­te­gra­tion of any new kick­ers with the ex­ist­ing elec­tro­sta­tic sep­tum would be prob­lem­atic, a so­lu­tion has been de­vel­oped to fast ex­tract the beam using non-lo­cal ex­trac­tion with other SPS kick­ers. Two dif­fer­ent kicker sys­tems have been used, the in­jec­tion kicker in LSS1 and the stronger ex­trac­tion kicker in LSS6 to ex­tract 100 and 440 GeV beam, re­spec­tively. For both so­lu­tions a large emit­tance beam was ex­tracted after 5 or 9 full be­ta­tron pe­ri­ods. The con­cept and sim­u­la­tion de­tails are pre­sented with the analy­sis of the aper­ture and beam loss con­sid­er­a­tions and ex­per­i­men­tal re­sults col­lected dur­ing a se­ries of beam tests.  
 
MOPFI051 Beam Transfer Systems for the LAGUNA-LBNO Long Baseline Neutrino Beam from the CERN SPS 395
 
  • B. Goddard, W. Bartmann, I. Efthymiopoulos, Y. Papaphilippou, A.S. Parfenova
    CERN, Geneva, Switzerland
  
  For the Long Base­line neu­trino fa­cil­ity under study at CERN (LA­GUNA-LBNO) it is ini­tially planned to ex­tract a 400 GeV beam from the sec­ond long straight sec­tion in the SPS into the ex­ist­ing trans­fer chan­nel TT20 lead­ing to the North Area ex­per­i­men­tal zone, to a new tar­get aligned with a far de­tec­tor in Fin­land. In a sec­ond phase a new High-Power Pro­ton Syn­chro­tron (HPPS) ac­cel­er­a­tor is pro­posed, to give a 2 MW beam at about 50 GeV on the same tar­get. In this paper the beam trans­fer sys­tems re­quired for the pro­ject are out­lined, in­clud­ing the new sec­tions of trans­fer line be­tween the SPL, HPPS and SPS, and from the SPS to the tar­get, and also the in­jec­tion and ex­trac­tion sys­tems in the long straight sec­tion of the HPPS. The fea­si­bil­ity of a 4 GeV H− in­jec­tion sys­tem is dis­cussed.  
 
MOPFI054 Upgrades for the CERN PSB-TO-PS Transfer at 2 GeV 404
 
  • W. Bartmann, J. Borburgh, J.R.T. Cole, S.S. Gilardoni, B. Goddard, O. Hans, M. Hourican, L. Sermeus, R. Steerenberg
    CERN, Geneva, Switzerland
  • C.H. Yu
    IHEP, Beijing, People's Republic of China
  
  The CERN PS Booster ex­trac­tion en­ergy will be up­graded from 1.4 to 2.0 GeV to al­le­vi­ate the di­rect space charge tune shift in the PS. The fo­cussing struc­ture of the trans­fer line will be mod­i­fied in order to bet­ter match the op­tics be­tween the PSB and the PS. The op­tics of the PS at in­jec­tion and, with it, of the trans­fer line can be adapted to re­duce the con­tin­u­ous losses from the al­ready in­jected and cir­cu­lat­ing beam bumped to­wards the sep­tum. Ex­per­i­men­tal re­sults of the op­tics op­ti­mi­sa­tion and prob­ing the in­jec­tion kicker gap will be shown.  
 
MOPFI055 Design Study of a 100 GeV Beam Transfer Line from the SPS for a Short Baseline Neutrino Facility 407
 
  • W. Bartmann, B. Goddard, A. Kosmicki, M. Kowalska, F.M. Velotti
    CERN, Geneva, Switzerland
  
  A Short Base­line neu­trino fa­cil­ity at CERN is presently under study. It is con­sid­ered to ex­tract a 100 GeV beam from the sec­ond long straight sec­tion of the SPS into the ex­ist­ing trans­fer chan­nel TT20, which leads to the North Area ex­per­i­men­tal zone. A new trans­fer line would branch off the ex­ist­ing TT20 line around 600 m down­stream of the ex­trac­tion, fol­lowed by an S-shaped hor­i­zon­tal bend­ing arc to di­rect the beam with the cor­rect angle onto the de­fined tar­get lo­ca­tion. This paper de­scribes the op­ti­mi­sa­tion of the line geom­e­try with re­spect to the switch re­gions in TT20, the in­te­gra­tion into the ex­ist­ing fa­cil­i­ties and the po­ten­tial re­fur­bish­ment of ex­ist­ing mag­nets. The op­tics de­sign is shown, and the re­quire­ments for the mag­nets, power con­vert­ers and in­stru­men­ta­tion hard­ware are dis­cussed.  
 
MOPFI060 Beam Transfer to LHC with the Low Gamma-transition SPS Optics 419
 
  • G. Vanbavinckhove, W. Bartmann, H. Bartosik, C. Bracco, L.N. Drøsdal, B. Goddard, V. Kain, M. Meddahi, V. Mertens, Y. Papaphilippou, J.A. Uythoven, J. Wenninger
    CERN, Geneva, Switzerland
  • E. Gianfelice-Wendt
    Fermilab, Batavia, USA
  
  A new low gamma-tran­si­tion op­tics with a lower in­te­ger tune, was in­tro­duced in the SPS to im­prove beam sta­bil­ity at high in­ten­sity. For trans­fer­ring the beam to the LHC, the ex­trac­tion bumps, ex­trac­tion kick­ers and trans­fer lines needed to be adapted to the new op­tics. In par­tic­u­lar, the trans­fer lines were re-matched and re-com­mis­sioned with the new op­tics. The first op­er­a­tional re­sults are dis­cussed for the SPS ex­trac­tion, the trans­fer lines and the LHC in­jec­tion. A de­tailed com­par­i­son is pre­sented be­tween the old and the new op­tics of the tra­jec­to­ries, dis­per­sion, losses and other per­for­mance as­pects.  
 
MOPFI061 Concept for Elena Extraction and Beam Transfer Elements 422
 
  • J. Borburgh, B. Balhan, W. Bartmann, T. Fowler, L. Sermeus, G. Vanbavinckhove
    CERN, Geneva, Switzerland
  • R.A. Baartman
    TRIUMF, Vancouver, Canada
  • D. Barna
    University of Tokyo, Tokyo, Japan
  • V. Pricop
    Transilvania University of Brasov, Brasov, Romania
  
  In 2011 the ELENA de­cel­er­a­tor was ap­proved as a CERN pro­ject. Ini­tially one ex­trac­tion was fore­seen, which should use a kicker and a mag­netic sep­tum which can be re­cu­per­ated from an ear­lier in­stal­la­tion. Since then a sec­ond ex­trac­tion has been ap­proved and a new so­lu­tion was stud­ied using only elec­tric fields to ex­tract the beam. This will be achieved by fast puls­ing a sep­a­ra­tor, al­low­ing sin­gle-bunch but also a full sin­gle-turn ex­trac­tion from ELENA to­wards the ex­per­i­ments. The ex­trac­tion and trans­fer re­quire­ments of ELENA are de­scribed, fol­lowed by the prin­ci­pal dif­fer­ences be­tween the mag­netic and elec­tric field con­cepts. The de­sign of elec­tro­sta­tic fo­cussing and bend­ing de­vices for the trans­fer lines will be pre­sented. Fi­nally the field qual­ity which can be achieved with the sep­a­ra­tor and the con­cept of its power sup­ply will be dis­cussed.  
 
MOPWO033 Analysis of LHC Transfer Line Trajectory Drifts 960
 
  • L.N. Drøsdal, W. Bartmann, H. Bartosik, C. Bracco, B. Goddard, V. Kain, Y. Papaphilippou, J.A. Uythoven, G. Vanbavinckhove, J. Wenninger
    CERN, Geneva, Switzerland
  • E. Gianfelice-Wendt
    Fermilab, Batavia, USA
  
  The LHC is filled from the SPS via two 3km long trans­fer lines. In the first years of LHC op­er­a­tion large tra­jec­tory vari­a­tions were dis­cov­ered. The sources of bunch-by-bunch and shot-by-shot tra­jec­tory vari­a­tions had been iden­ti­fied and im­proved by the 2012 LHC run. The ori­gins of the longer term drifts were how­ever still un­clear and sig­nif­i­cant time was spent cor­rect­ing the tra­jec­to­ries. In the last part of the 2012 run the op­tics in the SPS was changed to lower tran­si­tion en­ergy. Tra­jec­tory sta­bil­ity and cor­rec­tion fre­quency will be com­pared be­tween be­fore and after the op­tics change in the SPS. The sources of the vari­a­tions have now been iden­ti­fied and will be dis­cussed in this paper. Reme­dies for op­er­a­tion after the long shut­down will be pro­posed.  
 
TUPME032 Update on Beam Induced RF Heating in the LHC 1646
 
  • B. Salvant, O. Aberle, G. Arduini, R.W. Aßmann, V. Baglin, M.J. Barnes, W. Bartmann, P. Baudrenghien, O.E. Berrig, A. Bertarelli, C. Bracco, E. Bravin, G. Bregliozzi, R. Bruce, F. Carra, F. Caspers, G. Cattenoz, S.D. Claudet, H.A. Day, M. Deile, J.F. Esteban Müller, P. Fassnacht, M. Garlaschè, L. Gentini, B. Goddard, A. Grudiev, B. Henrist, S. Jakobsen, O.R. Jones, O. Kononenko, G. Lanza, L. Lari, T. Mastoridis, V. Mertens, N. Mounet, E. Métral, A.A. Nosych, J.L. Nougaret, S. Persichelli, A.M. Piguiet, S. Redaelli, F. Roncarolo, G. Rumolo, B. Salvachua, M. Sapinski, R. Schmidt, E.N. Shaposhnikova, L.J. Tavian, M.A. Timmins, J.A. Uythoven, A. Vidal, J. Wenninger, D. Wollmann, M. Zerlauth
    CERN, Geneva, Switzerland
  • H.A. Day
    UMAN, Manchester, United Kingdom
  • L. Lari
    IFIC, Valencia, Spain
  
  Since June 2011, the rapid in­crease of the lu­mi­nos­ity per­for­mance of the LHC has come at the ex­pense of in­creased tem­per­a­ture and pres­sure read­ings on spe­cific near-beam LHC equip­ment. In some cases, this beam in­duced heat­ing has caused de­lays whilie equip­ment cools down, beam dumps and even degra­da­tion of these de­vices. This con­tri­bu­tion gath­ers the ob­ser­va­tions of beam in­duced heat­ing at­trib­ut­able to beam cou­pling im­ped­ance, their cur­rent level of un­der­stand­ing and pos­si­ble ac­tions that are planned to be im­ple­mented dur­ing the long shut­down in 2013-2014.  
 
TUPWO051 Geometry and Optics of the Electrostatic ELENA Transfer Lines 1985
 
  • G. Vanbavinckhove, W. Bartmann, F. Butin, O. Choisnet
    CERN, Geneva, Switzerland
  • R.A. Baartman
    TRIUMF, Vancouver, Canada
  • D. Barna, H. Yamada
    University of Tokyo, Tokyo, Japan
  
  The fu­ture ELENA ring at CERN will de­cel­er­ate the AD an­tipro­ton beam fur­ther from 5.3 MeV to 100 keV ki­netic en­ergy, to in­crease the ef­fi­ciency of an­tipro­ton trap­ping. At pre­sent there are four ex­per­i­men­tal areas in the AD hall which will be com­ple­mented with the in­stal­la­tion of ELENA by ad­di­tional three ex­per­i­ments and an ad­di­tional source for com­mis­sion­ing. This paper de­scribes the op­ti­mi­sa­tion of the trans­fer line geom­e­try, ring ro­ta­tion and source po­si­tion. The op­tics of the trans­fer lines and error stud­ies to de­fine field and align­ment tol­er­ances are shown, and the op­tics par­tic­u­lar­i­ties of elec­tro­sta­tic el­e­ments and their op­ti­mi­sa­tion high­lighted.  
 
WEPEA053 Progress with the Upgrade of the SPS for the HL-LHC Era 2624
 
  • B. Goddard, T. Argyropoulos, W. Bartmann, H. Bartosik, T. Bohl, F. Caspers, K. Cornelis, H. Damerau, L.N. Drøsdal, L. Ducimetière, J.F. Esteban Müller, R. Garoby, M. Gourber-Pace, W. Höfle, G. Iadarola, L.K. Jensen, V. Kain, R. Losito, M. Meddahi, A. Mereghetti, V. Mertens, Ö. Mete, E. Montesinos, Y. Papaphilippou, G. Rumolo, B. Salvant, E.N. Shaposhnikova, M. Taborelli, H. Timko, F.M. Velotti
    CERN, Geneva, Switzerland
  • E. Gianfelice-Wendt
    Fermilab, Batavia, USA
  
  The de­mand­ing beam per­for­mance re­quire­ments of the HL-LHC pro­ject trans­late into a set of re­quire­ments and up­grade paths for the LHC in­jec­tor com­plex. In this paper the per­for­mance re­quire­ments for the SPS and the known lim­i­ta­tions are re­viewed in the light of the 2012 op­er­a­tional ex­pe­ri­ence. The var­i­ous SPS up­grades in progress and still under con­sid­er­a­tion are de­scribed, in ad­di­tion to the ma­chine stud­ies and sim­u­la­tions per­formed in 2012. The ex­pected ma­chine per­for­mance reach is es­ti­mated on the basis of the pre­sent knowl­edge, and the re­main­ing de­ci­sions that still need to be made con­cern­ing up­grade op­tions are de­tailed.  
 
WEPEA062 Progress in ELENA Design 2651
 
  • S. Maury, W. Bartmann, P. Belochitskii, H. Breuker, F. Butin, C. Carli, T. Eriksson, R. Kersevan, S. Pasinelli, G. Tranquille, G. Vanbavinckhove
    CERN, Geneva, Switzerland
  • W. Oelert
    FZJ, Jülich, Germany
  
  The Extra Low En­ergy An­tipro­ton ring (ELENA) is a small ring at CERN which will be built to in­crease sub­stan­tially the num­ber of us­able (or trap­pable) an­tipro­tons de­liv­ered to ex­per­i­ments for stud­ies with an­ti­hy­dro­gen. The re­port shows the progress in the ELENA de­sign. The choice of op­tics and ring lay­out in­side of AD hall is given. The main lim­i­ta­tions for beam pa­ra­me­ters at ex­trac­tion like intra beam scat­ter­ing and tune shift due to space charge are dis­cussed. The elec­tron cooler plays key role in ELENA both for ef­fi­cient de­cel­er­a­tion as well as for prepar­ing ex­tracted beam with pa­ra­me­ters de­fined by ex­per­i­ments. The other im­por­tant sys­tems like beam vac­uum, beam in­stru­men­ta­tions and oth­ers are re­viewed as well.  
 
THPWO078 Status of the Upgrade of the CERN PS Booster 3939
 
  • K. Hanke, O. Aberle, M. E. Angoletta, W. Bartmann, S. Bartolome, E. Benedetto, C. Bertone, A. Blas, P. Bonnal, J. Borburgh, D. Bozzini, A.C. Butterworth, C. Carli, E. Carlier, J.R.T. Cole, P. Dahlen, M. Delonca, T. Dobers, A. Findlay, R. Froeschl, J. Hansen, D. Hay, S. Jensen, J.-M. Lacroix, P. Le Roux, L.A. Lopez Hernandez, C. Maglioni, A. Masi, G.W. Mason, S.J. Mathot, B. Mikulec, Y. Muttoni, A. Newborough, D. Nisbet, S. Olek, M.M. Paoluzzi, A. Perillo-Marcone, S. Pittet, B. Puccio, V. Raginel, B. Riffaud, I. Ruehl, A. Sarrió Martínez, J. Tan, B. Todd, V. Venturi, W.J.M. Weterings
    CERN, Geneva, Switzerland
  
  The CERN PS Booster (PSB) is presently un­der­go­ing an am­bi­tious con­sol­i­da­tion and up­grade pro­gram within the frame of the LHC In­jec­tors Up­grade (LIU) pro­ject. This pro­gram com­prises a new in­jec­tion scheme for H− ions from CERN’s new Linac4, the re­place­ment of the main RF sys­tems and an en­ergy up­grade of the PSB rings from 1.4 to 2.0 GeV which in­cludes the re­place­ment of the main mag­net power sup­ply as well as the up­grade of the ex­trac­tion equip­ment. This paper de­scribes the sta­tus and plans of this work pro­gram.  
 
THPWO079 A Possible Scheme to Deliver 2 GeV Beams from the CERN PS Booster to the ISOLDE Facility 3942
 
  • K. Hanke, W. Bartmann, J.R.T. Cole, R. Fernandes Luis, A. Newborough, S. Pittet, T. Stora, D. Voulot
    CERN, Geneva, Switzerland
  
  The CERN PS Booster (PSB) is presently un­der­go­ing an up­grade pro­gram to in­crease its beam en­ergy from 1.4 GeV to 2.0 GeV. While this en­ergy up­grade is tar­geted at LHC-type beams, the op­tion of de­liv­er­ing 2 GeV beams to the ISOLDE fa­cil­ity has also been in­ves­ti­gated. In this paper we pre­sent a pre­lim­i­nary study for de­liv­er­ing 2 GeV beams to ISOLDE in­clud­ing the physics mo­ti­va­tion and the im­pli­ca­tions on the ac­cel­er­a­tor hard­ware.  
 
THPWO080 Operational Performance of the LHC Proton Beams with the SPS Low Transition Energy Optics 3945
 
  • Y. Papaphilippou, G. Arduini, T. Argyropoulos, W. Bartmann, H. Bartosik, T. Bohl, C. Bracco, S. Cettour-Cave, K. Cornelis, L.N. Drøsdal, J.F. Esteban Müller, B. Goddard, A. Guerrero, W. Höfle, V. Kain, G. Rumolo, B. Salvant, E.N. Shaposhnikova, H. Timko, D. Valuch, G. Vanbavinckhove, J. Wenninger
    CERN, Geneva, Switzerland
  • E. Gianfelice-Wendt
    Fermilab, Batavia, USA
  
  An op­tics in the SPS with lower in­te­ger tunes (20 ver­sus 26) was pro­posed and in­tro­duced in ma­chine stud­ies since 2010, as a mea­sure for in­creas­ing trans­verse and lon­gi­tu­di­nal in­sta­bil­ity thresh­olds, es­pe­cially at low en­ergy, for the LHC pro­ton beams. After two years of ma­chine stud­ies and care­ful op­ti­mi­sa­tion, the new “Q20” op­tics be­came op­er­a­tional in Sep­tem­ber 2012 and steadily de­liv­ered beam to the LHC until the end of the run. This paper re­views the op­er­a­tional per­for­mance of the Q20 op­tics with re­spect to trans­verse and lon­gi­tu­di­nal beam char­ac­ter­is­tics in the SPS, en­abling high bright­ness beams in­jected into the LHC. As­pects of lon­gi­tu­di­nal beam sta­bil­ity, trans­mis­sion, high-en­ergy orbit con­trol and beam trans­fer are dis­cussed.