6533b7ddfe1ef96bd1273ea0

RESEARCH PRODUCT

The fast photon detection system of COMPASS RICH-1

P. AbbonM. AlekseevH. AngererM. ApollonioR. BirsaP. BordaloF. BradamanteA. BressanL. BussoM. ChiossoP. CilibertiM.l. ColantoniS. CostaT. DafniS. Dalla TorreE. DelagnesH. DeschampsV. DiazN. DibiaseV. DuicW. EyrichD. FasoA. FerreroM. FingerM. FingerH. FischerS. GerassimovM. GiorgiB. GobboD. Von HarrachF.h. HeinsiusR. JoostenB. KetzerV.n. KolosovK. KönigsmannI. KonorovD. KramerF. KunneA. LehmannS. LevoratoA. MaggioraA. MagnonA. MannA. MartinG. MenonA. MutterO. NähleF. NerlingD. NeyretP. PaganoS. PanebiancoD. PanzieriS. PaulG. PesaroC. PizzolottoJ. PolakP. RebourgeardE. RoccoF. RobinetP. SchiavonC. SchillP. SchoenmeierW. SchröderL. SilvaM. SluneckaF. SozziL. SteigerM. SulcM. SvecF. TessarottoA. TeufelH. Wollny

subject

PhotomultiplierNuclear and High Energy PhysicsPhotonMulti-anode photomultiplier tubesPhysics::Instrumentation and DetectorsUV lensesCOMPASS; Multi-anode photomultiplier tubes; Photon detection; RICH; UV lenses; Nuclear and High Energy Physics; InstrumentationCOMPASSlaw.inventionFAST-RICH; DEUTERON; READOUT; DESIGNOpticsDESIGNlawMulti-anode photomultiplier tubeCompassCOMPASS experimentRICHInstrumentationNuclear and High Energy PhysicPhysicsLarge Hadron Colliderbusiness.industryDetectorREADOUTDEUTERONLens (optics)UpgradePhoton detectionFAST-RICHUV lenseHigh Energy Physics::Experimentbusiness

description

Abstract A fast photon detection system has been built for the upgrade of COMPASS RICH-1, the large size gaseous RICH detector in use at the COMPASS Experiment at the CERN SPS since 2001. The photon detectors of the central region have been replaced by a new system based on multi-anode photomultipliers coupled to individual fused silica lens telescopes and a fast readout electronics system, while in the outer region the existing MWPCs with CsI photocathodes have been equipped with a new readout system, based on the APV chip. RICH-1 has been successfully operated in its upgraded version during the 2006 run. We report on the upgrade design and construction, and on the preliminary characterization of the upgraded RICH-1 performances: at saturation about 60 photons per ring have routinely been obtained and the background level has drastically been reduced thanks to the good time resolution of the new system, leading to a 2 σ π –K separation above 55 GeV/c.

10.1016/j.nima.2007.08.018http://hdl.handle.net/11368/1929944