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SUMMARY:The ultra low mass cooling system of the Belle II DEPFET detector
DTSTART;VALUE=DATE-TIME:20120503T180000Z
DTEND;VALUE=DATE-TIME:20120503T190000Z
DTSTAMP;VALUE=DATE-TIME:20130524T230800Z
UID:indico-contribution-23@cern.ch
DESCRIPTION:Speakers: Dr. MARINAS PARDO\, Carlos (Bonn University)\nThe ne
 w e$^{+}$e$^{-}$ colliders impose unprecedented demands to the performance
  of the vertex detectors. To achieve the required resolution in the vertex
  reconstruction\, besides highly segmented pixel detectors\, the material 
 budget has to be kept at very low levels to reduce the multiple Coulomb sc
 attering. These requirements are even more challenging in the case of the 
 new Japanese Super Flavour Factory (SuperKEKB) where the very low momentum
  of the particles in the final state requires a vertex detector with less 
 than 0.2%~X$_{0}$ per layer\, together with 50x50~$\\mu$m$^{2}$ pixels\, t
 o achieve the aimed resolution of 8.5~$\\mu$m.\n\nAs a consequence\, there
  is an obvious impact on the cooling system\, that has to be carefully des
 igned\, not allowing active cooling pipes inside the acceptance region. Du
 e to the low power dissipation of the DEPFET sensor and the special geomet
 ry of the detectors (with the front end electronics placed at both ends of
  the ladder)\, the system can be chilled using 2-phase CO$_{2}$ cooling th
 rough the massive support structures outside of the acceptance\, while the
  sensitive area relies on forced convection with cold dry air.\n\nIn the t
 alk not only full thermal simulations will be presented but also measureme
 nts done with a real mock up\, showing that a proper cooling of the vertex
  detector can be made using this approach.\n\nhttp://indico.cern.ch/contri
 butionDisplay.py?contribId=23&sessionId=6&confId=154525
LOCATION:INFN Pisa
URL:http://indico.cern.ch/contributionDisplay.py?contribId=23&sessionId=6&
 confId=154525
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