The existing muon detectors for high energy physics (HEP) experiments are mainly made of gas chambers such as Resistive Plate Chambers (RPC), Limited Streamer Tubes (LST) or Multy Wire Proportional Chambers. With the increasing of the luminosity in the new accelerators, RPCs and LSTs are not capable to maintain good performances due to the consequent increasing of the particles rate. Moreover the aging process due to the charge accumulation can be a serious issues. The MWPC are rather expensive to cover the huge areas of the new HEP experiments. Extruded scintillators together with wavelength shifter (WLS) fibers can be the active core of a new kind of muon system for high energy physics experiments. The light collected by the WLS fibers is readout by Geiger-Mode Avalanche Photo-Diodes (GM-APD) which are cheaper with respect to the PhotoMultipliers and less sensitive to temperature and bias variations with respect to the APDs. GM-APDs can also work in a magnetic field and have an outstanding time resolution that is used to measure one of the coordinates of the muon system. This way the two coordinates of a detector plane are readout by the same detector element and the ambiguity in presence of more than one track is also solved. We will report our R&D results for different detector layouts and different GM-APDs (i.e. Hamamatsu MPPC and FBK-IRST SiPM): charge spectra and efficiency measurement will be discussed in association with the noise rate. The WLS fibers parameters (i.e. light yield and time response) are essential to have good detection efficiency and resolution: tests with Kuraray and Bicron fibers will be presented and an extended study of the time resolution will be shown along with its implication on the detector performances. Setup optimization and experimental issues will be also discussed as well as the future plans and perspectives.
A Muon Detector Based on Extruded Scintillators, WLS Fibers and GM-APD Readout for a Super B Factory
CIBINETTO, Gianluigi;CALABRESE, Roberto;BALDINI, Wander;TOMASSETTI, Luca;SANTORO, Valentina;ANDREOTTI, Mirco;COTTA RAMUSINO, Angelo;MALAGUTI, Roberto;CARASSITI, Vittore;EVANGELISTI, Federico;LUPPI, Eleonora;MUNERATO, Mauro
2009
Abstract
The existing muon detectors for high energy physics (HEP) experiments are mainly made of gas chambers such as Resistive Plate Chambers (RPC), Limited Streamer Tubes (LST) or Multy Wire Proportional Chambers. With the increasing of the luminosity in the new accelerators, RPCs and LSTs are not capable to maintain good performances due to the consequent increasing of the particles rate. Moreover the aging process due to the charge accumulation can be a serious issues. The MWPC are rather expensive to cover the huge areas of the new HEP experiments. Extruded scintillators together with wavelength shifter (WLS) fibers can be the active core of a new kind of muon system for high energy physics experiments. The light collected by the WLS fibers is readout by Geiger-Mode Avalanche Photo-Diodes (GM-APD) which are cheaper with respect to the PhotoMultipliers and less sensitive to temperature and bias variations with respect to the APDs. GM-APDs can also work in a magnetic field and have an outstanding time resolution that is used to measure one of the coordinates of the muon system. This way the two coordinates of a detector plane are readout by the same detector element and the ambiguity in presence of more than one track is also solved. We will report our R&D results for different detector layouts and different GM-APDs (i.e. Hamamatsu MPPC and FBK-IRST SiPM): charge spectra and efficiency measurement will be discussed in association with the noise rate. The WLS fibers parameters (i.e. light yield and time response) are essential to have good detection efficiency and resolution: tests with Kuraray and Bicron fibers will be presented and an extended study of the time resolution will be shown along with its implication on the detector performances. Setup optimization and experimental issues will be also discussed as well as the future plans and perspectives.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
