Author: Eisel, T.
Paper Title Page
MOPME071 Characterisation of Si Detectors for use at 2 Kelvin 643
 
  • M.R. Bartosik, C. Arregui Rementeria, B. Dehning, T. Eisel, C. Kurfuerst, M. Sapinski
    CERN, Geneva, Switzerland
  • V. Eremin, E. Verbitskaya
    IOFFE, St. Petersburg, Russia
  
  Funding: This research project has been supported by a Marie Curie Early Initial Training Network Fellowship of the European Community’s Seventh Framework Programme under contract nr PITN-GA-2011-289485-OPAC.
It is ex­pected that the lu­mi­nos­ity of the Large Hadron Col­lider (LHC) will be bounded in the fu­ture by the beam loss lim­its of the su­per­con­duct­ing mag­nets. To pro­tect the su­per­con­duct­ing mag­nets of the high lu­mi­nos­ity in­ser­tions an op­ti­mal de­tec­tion of the en­ergy de­po­si­tion by the shower of beam par­ti­cles is nec­es­sary. There­fore beam Loss Mon­i­tors (BLM) need to be placed close to the par­ti­cle im­pact lo­ca­tion in the cold mass of the mag­nets where they should op­er­ate in su­per­fluid he­lium at 1.9 Kelvin. To choose op­ti­mal de­tec­tors n-type sil­i­con wafers have been ex­am­ined at su­per­fluid he­lium tem­per­a­ture whilst under ir­ra­di­a­tion from a high in­ten­sity pro­ton beam. The ra­di­a­tion hard­ness and leak­age cur­rent of these de­tec­tors were found to be sig­nif­i­cantly im­proved at 1.9 Kelvin when com­pared to their op­er­a­tion at room tem­per­a­ture. 		 
 
THPEA044 Radiation Tolerance of Cryogenic Beam Loss Monitor Detectors 3240
 
  • C. Kurfuerst, C. Arregui Rementeria, M.R. Bartosik, B. Dehning, T. Eisel, M. Sapinski
    CERN, Geneva, Switzerland
  • V. Eremin, E. Verbitskaya
    IOFFE, St. Petersburg, Russia
  • C. Fabjan
    HEPHY, Wien, Austria
  • E. Griesmayer
    CIVIDEC Instrumentation, Wien, Austria
  
  At the triplet mag­nets, close to the in­ter­ac­tion re­gions of the LHC, the cur­rent Beam Loss Mon­i­tor­ing sys­tem is sen­si­tive to the par­ti­cle show­ers re­sult­ing from the col­li­sion of the two beams. For the fu­ture, with beams of higher en­ergy and in­ten­sity re­sult­ing in higher lu­mi­nos­ity, dis­tin­guish­ing be­tween these in­ter­ac­tion prod­ucts and pos­si­ble quench-pro­vok­ing beam losses from the pri­mary pro­ton beams will be chal­leng­ing. In­ves­ti­ga­tions are there­fore un­der­way to op­ti­mise the sys­tem by lo­cat­ing the beam loss de­tec­tors as close as pos­si­ble to the su­per­con­duct­ing coils of the triplet mag­nets. This means putting de­tec­tors in­side the cold mass in su­per­fluid he­lium at 1.9 K. Pre­vi­ous tests have shown that solid state di­a­mond and sil­i­con de­tec­tors as well as liq­uid he­lium ion­i­sa­tion cham­bers are promis­ing can­di­dates. This paper will ad­dress the final open ques­tion of their ra­di­a­tion re­sis­tance for 20 years of nom­i­nal LHC op­er­a­tion, by re­port­ing on the re­sults from high ir­ra­di­a­tion beam tests car­ried out at CERN in a liq­uid he­lium en­vi­ron­ment.