PNPI in LHCb A.Vorobyov HEPD Scientific Board meeting, December 26,2003 Status report for 2003.

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PNPI in LHCb A.Vorobyov HEPD Scientific Board meeting, December 26,2003 Status report for 2003

LHCb MUON SYSTEM Goals: Goals: 1. Muon identification 1. Muon identification 2.Trigger with Pt cut at >1.2 Gev/c 2.Trigger with Pt cut at >1.2 Gev/c Strategy: Strategy: 1. Stand-alone mode ( using information only from Muon Stations) 1. Stand-alone mode ( using information only from Muon Stations) 2. Pad structure ( 24x4 cm2, 12x2cm2, 6x1cm2, 3x0.5cm2 ) 2. Pad structure ( 24x4 cm2, 12x2cm2, 6x1cm2, 3x0.5cm2 ) 1. M.Borkovsky,A.Tsaregorodtsev,A.Vorobyov 1. M.Borkovsky,A.Tsaregorodtsev,A.Vorobyov The LHCb Level-0 Muon Trigger, LHCb The LHCb Level-0 Muon Trigger, LHCb Background: Background: 10*3- 10*5 charged particles/cm2xsec 10*3- 10*5 charged particles/cm2xsec 2. N,Sagidova, A.Tsaregorodtsev, A.Vorobyov 2. N,Sagidova, A.Tsaregorodtsev, A.Vorobyov GCALOR Studies of Background in LHCb Muon Chambers GCALOR Studies of Background in LHCb Muon Chambers LHCb LHCb

LHCb MUON SYSTEM Detector technology: Detector technology: Modest space resolution (pad size) Modest space resolution (pad size) High time resolution ( <3ns rms) High time resolution ( <3ns rms) High efficiency ( >99% in 20ns window) High efficiency ( >99% in 20ns window) High rates ( 10 ^ 5 /channel*sec) High rates ( 10 ^ 5 /channel*sec) Slow aging (up to 1 C/cm wire) Slow aging (up to 1 C/cm wire) Our proposal: 3. Wire / cathode pad chambers 3. Wire / cathode pad chambers LHCb Note LHCb Note

Wire chamber for LHCb Muon System

Development of LHCb Muon Chambers Development of LHCb Muon Chambers B.Bochin, S.Guets, A.Kashshuk, V.Lazarev, N.Sagidova, E.Spiridenkov, A.Tsaregorodtsev, G.Velichko, An.Vorobiev, A.Vorobyov 3. Wire Pad Chamber for LHCb Muon System, LHCb of the wire pad chambers 4. Beam tests of WPC-7 prototype of the wire pad chambers for the LHCb Muon System, for the LHCb Muon System, LHCb LHCb Beam tests of WPC-8 and WPC-9 prototypes of the wire pad chambers for the LHCb Muon System, chambers for the LHCb Muon System, LHCb LHCb Test results of a full size prototype of the muon chambers for region M2/R4 of the LHCb Muon System region M2/R4 of the LHCb Muon System LHCb LHCb

Wire chamber for LHCb Muon System

wpc parametrs ANODE -CATHODE DISTANCE 2.5 MM WIRE SPACING 2.0 MM WIRE DIAM 30 MKM GAS MIXTURE Ar /CO2 /CF4 HV 2.9 KV GAS GAIN 10^5

HV & Readout scheme.

Shape of the signal from a wire pad

An example of ADC and TDC distributions. Plane AB. Thresh = 30 mV. Beam on pad 11. HV=3.1 kV. Time resolution = 3.13 ns (rms) Efficiency in 20ns window= 99.2%

Efficiency for double-gap and four-gap modes Beam intensity 50 kHz 20ns time window

Noise rates between beam spills for various thresholds. Ar(40%)+CO2(50%)+CF4(10%). Plane AB. Beam on pad 11. Arrows indicate positions of HVmin.

Gas gain variation over the surface of M2R4-01

Cross talk probabilities vs HV. Beam on pad 11. Presented are the cross-talks to neighbour pads (10 & 12) and to next-to-neighbour pads (9 & 13). TDC window = 300 ns.

Mass production of Muon chambers Total number of chambers in Muon System 1300 chambers 1300 chambers To be produced in PNPI-1 factory 200 chambers M2R4 200 chambers M2R4 200 chambers M3R4 200 chambers M3R4 To be produced in PNPI-2 factory 200 chambers M4R4 200 chambers M4R4

PNPI-1 Muon Chamber Factory

TOOLING *Bar glueing machines *Wiring machine *Soldering machine *Wire pitch&tension measuring machine

Bar glueing machine

Muon Chamber Production Plan in PNPI-1 Production rate up to one chamber per day 400 chambers by the end of 2005

PNPI-2 factory By August 2004 CMS Muon ChamberFactory should be transferred should be transferred into PNPI-2 LHCb muon Chamber Factory All chambers should be constructed by the end of 2005