Stato del progetto RICH di LHCb Partecipanti italiani: Genova e Milano Clara Matteuzzi 16 settembre 2008 CSN1-Pisa

The LHCb spectrometer Special features: a dedicated trigger and Particle Identification Vertex Locator RICH counters p/K/p Identification Muon System Tracking Calorimeters 16 settembre 2008 CSN1-Pisa

All RICH systems ready to take data RICH2 commissioning under way since  1 year RICH1 completed in may-june 2008 HPDs permanently powered (-18 kV) Corrections for magnetic distorsions implemented for RICH1&2 At present CO2 flowing  change gas just before collisions 16 settembre 2008 CSN1-Pisa

RICH-1 last to be completed Upper HPD box Installed and read out Lower HPD box 16 settembre 2008 CSN1-Pisa

HPD Down Box Installation After HPD installation & testing the Down Box was transported to IP8 in its frame, installed and connected to the photon funnel

RICH1 Status 16 settembre 2008 CSN1-Pisa

Montaggio dell’aerogel (aprile-maggio 2008) 16 settembre 2008 CSN1-Pisa

Consiglio di Sezione Milano-Bicocca Preparativi e trasporto verso UX85 16 settembre 2008 CSN1-Pisa 8 10/07/2008 Consiglio di Sezione Milano-Bicocca

Consiglio di Sezione Milano-Bicocca La discesa nel Pit8 16 settembre 2008 10/07/2008 CSN1-Pisa Consiglio di Sezione Milano-Bicocca 9

Consiglio di Sezione Milano-Bicocca Apertura delle scatole ed ispezione 16 settembre 2008 10/07/2008 CSN1-Pisa Consiglio di Sezione Milano-Bicocca 10

Consiglio di Sezione Milano-Bicocca Installazione 16 settembre 2008 10/07/2008 CSN1-Pisa Consiglio di Sezione Milano-Bicocca 11

Aerogel Installation

RICH1 completo! 16 settembre 2008 CSN1-Pisa 13

Consiglio di Sezione Milano-Bicocca RICH1 completo! 16 settembre 2008 CSN1-Pisa Consiglio di Sezione Milano-Bicocca 14

RICH1 monitor 16 settembre 2008 CSN1-Pisa 15

reliability, stability and safety RICH Commissioning The first priority now is to be ready for collisions Effort to insure better: reliability, stability and safety Important progress in: HV stability L0 and L1 error monitoring and propagation Cooling plant stability and monitoring A few more software coded reactions to alerts and alarms Timing controls System routinely on HV (-18 kV) and Si bias on HPDs

RICH running In RICH, we have opted for piquets rather than shifters. “On call Piquet” has been organized and running for ~ a month (Tito in charge). Now two days, two persons. Towards a week piquet for running time. Training course are held for “will be” piquets. Piquet people requested to be present at the morning briefing.

RICH Calibration and Software Alignment and calibration strategy and studies are progressing well. RICH PID calibration with D* already mature. Calibrate RICH PID using pions and kaons from D* decays selected using kinematics only. Samples need to selected in bins of P and Pt. PID efficiency, mis-ID and DLL for a specific physics channel must be weighted for the relevant P and Pt distributions (using as base the D* decays). New study to use L->pp also for PID calibration.

Status of the HPDs 16 settembre 2008 CSN1-Pisa

HPDs vacuum issue 42 HPDs (41 in RICH2 and 1 in RICH1) have experienced or are experiencing vacuum problems (out of the 484 installed in the RICH). 20 HPDs have been replaced. Studies are going on to understand the origin of this behaviour. agreed on a deadline for investigations (January 2009). Photonis have re-processed two tubes, sent 1 at CERN and 1 in Edinburough. Negotiations are underway with Photonis for replacement tubes. All these HPDs installed in the RICHes, are still functional, however with an increased noise level.

RICH1&2: IFB vs. tube age combined update for RICH1&2 4 supports the hope/expectation that RICH 1 IFBs generally develop on a lower gradient New quartz Limit of glow discharge 4 RICH meeting, 01.09.2008

Overall RICH2 IFB Development Boundary between noisy and stable continues to move as before Mention Quartz theory

Example HPDs’ IFB Timeline RICH2: IFB – example data Example HPDs’ IFB Timeline Glow Discharge Good HPD NB: much lower y-scale Age = TestDate – PArrDate where PArrDate = Date HPD arrived at PDTF

Linear IFB Projection into 10th year Definition of ‘glow discharge’ ~30 HPDs in Overflow 100 HPDs will have >4% projected IFB after 10 years

Ion Feedback Correlation between high iion feedback rate at production and failure 16 out of 50 turned bad 9 out of 500 turned bad

RICH system ready to take data Success in the injection test:  used for time alignment with LHCb  events seen correlated to the “beam” 16 settembre 2008 CSN1-Pisa

Activity in RICH1&2 correlated with “calorimeter trigger” RICH1-up RICH1-down RICH2-side A RICH2-side C Injection test 6-7 september 2008 16 settembre 2008 CSN1-Pisa

16 settembre 2008 CSN1-Pisa

We have been thriving to see the first rings in our RICHes, … and these will come only with the beams. Meanwhile, the only rings we have been able to produce… Single photon accumulated image taken shining from a projector (the same used for the magn. distortion) on the C-side of RICH2. The light level over the whole surface is ~100 p.e. per event.

Attivita 2009 BORSE CERN-INFN: T.Bellunato Running RICH, allineamento ottica D.Perego Uso dei dati per calibrazioni radiatori (in particolare n e C dell’aerogel) ottimizzazion del pattern recognition del RICH per la PID globale Richiesta 1 borsa per Erica Fanchini (dott.) per misura µµ da DY Shift LHCb + piquets RICH (Genova, Milano) Monitor e manutenzione HV, LV (Genova, Milano) Analisi dati (Milano) Attivita R&D (elettronica) in preparazione di upgrade RICH (Milano) 16 settembre 2008 CSN1-Pisa

Backup slides 16 settembre 2008 CSN1-Pisa

Example Column of HPDs’ IFB Timeline Most HPDs show linear development over time

HPDs vacuum issue RICH 1 RICH 2