Author: Veness, R.
Paper Title Page
TUPS024 Development of Beryllium Vacuum Chamber Technology for the LHC 1578
 
  • R. Veness
    CERN, Geneva, Switzerland
  • C. Dorn, G. Simmons
    Materion Electrofusion, Fremont, California, USA
  
  Beryl­li­um is the ma­te­ri­al of choice for the beam vac­u­um cham­bers around col­li­sion points in par­ti­cle col­lid­ers due to a com­bi­na­tion of trans­paren­cy to par­ti­cles, high spe­cif­ic stiff­ness and com­pat­i­bil­i­ty with ul­tra-high vac­u­um. New re­quire­ments for these cham­bers in the LHC ex­per­i­ments have driv­en the de­vel­op­ment of new meth­ods for the man­u­fac­ture of beryl­li­um cham­bers. This paper re­views the re­quire­ments for ex­per­i­men­tal vac­u­um cham­bers. It de­scribes the new beryl­li­um tech­nol­o­gy adopt­ed for the LHC and ex­pe­ri­ence gained in the man­u­fac­ture and in­stal­la­tion.  
 
TUPS025 Design of a Highly Optimised Vacuum Chamber Support for the LHCb Experiment 1581
 
  • L. Leduc, G. Corti, R. Veness
    CERN, Geneva, Switzerland
  
  The beam vac­u­um cham­ber in the LHCb ex­per­i­men­tal area pass­es through the cen­tre of a large aper­ture dipole mag­net. The vac­u­um cham­ber and all its sup­port sys­tems lie in the ac­cep­tance of the de­tec­tor, so must be high­ly op­ti­mised for trans­paren­cy to par­ti­cles. As part of the up­grade pro­gramme for the LHCb vac­u­um sys­tem, the sup­port sys­tem has been re-de­signed using ad­vanced lightweight ma­te­ri­als. In this paper we dis­cuss the physics mo­ti­va­tion for the mod­i­fi­ca­tions, the cri­te­ria for the se­lec­tion of ma­te­ri­als and tests per­formed to qual­i­fy them for the par­tic­u­lar en­vi­ron­ment of a par­ti­cle physics ex­per­i­ment. We also pre­sent the de­sign of the re-op­ti­mised sup­port sys­tem.  
 
TUPS026 Specification of New Vacuum Chambers for the LHC Experimental Interactions 1584
 
  • R. Veness, R.W. Assmann, A. Ball, A. Behrens, C. Bracco, G. Bregliozzi, R. Bruce, H. Burkhardt, G. Corti, M.A. Gallilee, M. Giovannozzi, B. Goddard, D. Mergelkuhl, E. Métral, M. Nessi, W. Riegler, J. Wenninger
    CERN, Geneva, Switzerland
  • N. Mounet, B. Salvant
    EPFL, Lausanne, Switzerland
  
  The aper­tures for the vac­u­um cham­bers at the in­ter­ac­tion points in­side the LHC ex­per­i­ments are key both to the safe op­er­a­tion of the LHC ma­chine and to ob­tain­ing the best physics per­for­mance from the ex­per­i­ments. Fol­low­ing the suc­cess­ful start­up of the LHC physics pro­gramme the ALICE, ATLAS and CMS ex­per­i­ments have launched pro­jects to im­prove physics per­for­mance by adding de­tec­tor lay­ers clos­er to the beam. To achieve this they have re­quest­ed small­er aper­ture vac­u­um cham­bers to be in­stalled. The first pe­ri­ods of LHC op­er­a­tion have yield­ed much in­for­ma­tion both on the per­for­mance of the LHC and the sta­bil­i­ty and align­ment of the ex­per­i­ments. In this paper, the new in­for­ma­tion re­lat­ing to the aper­ture of these cham­bers is pre­sent­ed and a sum­ma­ry is made of anal­y­sis of pa­ram­e­ters re­quired to safe­ly re­duce the vac­u­um cham­bers aper­tures for the high-lu­mi­nos­i­ty ex­per­i­ments ATLAS and CMS.