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The production of mesons containing strange quarks (KS, φ) and both singly and doubly strange baryons ( , , and − + +) are measured at mid-rapidity in pp collisions at √ s = 0.9 TeV with the ALICE experiment at the LHC. The results are obtained from the analysis of about 250 k minimum bias events recorded in 2009. Measurements of yields (dN/dy) and(More)
The ALICE/HMPID detector has been equipped with 42 large area CsI photocathodes providing a total of 11m of photosensitive area for the detection of Cherenkov light. This production summary reports on the CsI coating procedure and provides results of the quality monitoring measurements by means of a photocurrent scanner system. The importance of the heat(More)
The operation of CsI photocathodes in gaseous detectors requires special attention to the purity of the applied gas mixtures. We have studied the influence of oxygen and water vapour contaminations on the performance of CsI photocathodes for the ALICE HMPID RICH prototype. Measurements were done through comparison of Cherenkov rings obtained from beam(More)
The emission of pions from relativistic heavy-ion collisions of S+S, S+Ag and S+Pb at 200 GeV/nucleon is characterized using two-particle interferometry. The multiplicity dependence of the pion source parameters near mid-rapidity is studied. The transversal and longitudinal source parameters, Rt and Rl, show a clear increase with the particle multiplicity.(More)
The complexity and the underground location of the new generation experiments (ALICE, ATLAS, CMS and LHCb) at the CERN Large Hadron Collider (LHC) requires a reliable and user friendly control system to operate such large detectors remotely. Control system experts at CERN are deeply involved in developing the JCOP (Joint Controls Project) ‘Framework’, a(More)
The ALICE HMPID RICH detector is equipped with CsI photocathodes in a MWPC for the detection of Cherenkov photons. The long term operational experience with large area CsI photocathodes will be described. The RICH prototypes have shown a very high stability of operation and performance, at a gain of 10 and with rates up to 2x10 cm s. When exposure to air(More)
I. G. Bearden,1 H. Bøggild,1 J. Boissevain,2 P. H. L. Christiansen,1 L. Conin,3 J. Dodd,4 B. Erazmus,3 S. Esumi,5,* C. W. Fabjan,6 D. Ferenc,7 A. Franz,6,† J. J. Gaardhøje,1 A. G. Hansen,1 O. Hansen,1 D. Hardtke,8,‡ H. van Hecke,2 E. B. Holzer,6 T. J. Humanic,8 P. Hummel,6 B. V. Jacak,9 K. Kaimi,5, M. Kaneta,5 T. Kohama,5 M. L. Kopytine,9 M. Leltchouk,4 A.(More)
We present the performances of large area CsI-RICH prototypes obtained in single particle events. The differential quantum efficiency of the photocathodes has been deduced from Cherenkov rings by means of two different procedures: a direct measurement with a thin NaF radiator and a Monte Carlo based estimation for a C6F14 radiator. A factor of merit of 45(More)