Russian groups in LHCb: Status report V. Egorychev CERN-Russia JWG, October 2009

Russian groups involved in LHCb ITEP INR RAS MSUBINP IHEP PNPI LHCb

Calorimeters:  ECAL development, installation, commissioning  HCAL development, installation, commissioning IHEP / ITEP / INR / BINP  PS/SPD development, installation, commissioning Muon installation, commissioning: chambers + HV system PNPI/MSU VELO commissioning MSU Common efforts of the groups from various Russian institutions Currently, all groups are deeply involved in the preparation for the data taking and physics analysis

Status of the LHCb experiment The LHCb detector is fully operational and READY for the LHC start-up

CALO System ECAL channels are aligned in time within 3 ns In order to improve stability of the phototube response and minimize the noise for ECAL the CW bases of 6000 PMTs have been modified The intermodule calibration of the ECAL PMTs better than 10% at the start-up final calibration to be done with RD HCAL – time aligned to 3 ns The HCAL calibration system with 137 Cs source is used regularly to monitor gain calibration PRS/SPD – time aligned to 3-4 ns General status – READY for data taking PMTs are performing very well show the expected stability Four 137 Cs runs since June in order to renew PMT regulation curves new calibration set is ready (available in DB) intermodule calibration ~4% 19 Jul, 07 Aug, 14 Aug, 04 Sep

MUON system MWPCs The system is composed of 5 stations separated by iron filters and equipped with Multi-Wire Proportional Chambers (MWPC) M1 station installation has been completed by June 7 th and closing procedure has been successfully tested M1 has been included in the global LHCb DAQ system M2-M5 completely debugged. As of mid June no missing readout channels were observed M2-M5 are now closed and aligned M1 station Step 1 Step 2 test chambers basic functionality (LV, HV, Gas) test chambers and their connections test all the acquisition lines

HV system  All chambers have been set to 2.65 kV (working point)  The HV control system has been upgraded and reviewed  Ready to be configured for data taking Replacing of 1 G  resistors in voltage sensors Installation of 56 k  resistors in HV regulator on Main Boards  A software package for recalibration of voltage sensors of PNPI HV-system has been implemented all RDBs (Remote Distribution Boards) have been installed and tested spare RDB modules have been produced in PNPI and will be delivered to CERN this autumn

LHCb detector READY for Physics We did it again… The installation of LHCb is fully completed, including M1 station All detector elements are commissioned and ready for data taking Strategy for trigger and physics analysis of 2010 Run is prepared LHCb is fully operational for Physics Run in 2010

LHCb data taking and shifts Participation in the data taking period is expected as: In the second half of this year the amount of visiting money was increased (unexpectedly!) → in total for this year we have 38% more than in the previous data taking shifts ( members of shift team - leaders, shift crews) computing shifts (re-processing, MC production) “expert” shifts (member of the run team / on-call piquet expert) We look forward to see at least the same amount of funds for the next year

Spectrometer modification Baseline scenario: increase our luminosity from 2x10 32 to 2x10 33 cm -2 s -1 average number of interactions per crossing 1.2 → 4.8 perform entire trigger on CPU farm with input rate 30 MHz trigger uses full event information, and can cut on p T and impact parameter simultaneously LHCb upgrade strategy  move Level 0 Trigger to fully software trigger  accelerate all detectors readout up to 40 MHz  increase the hadronic reconstruction efficiencies  improve radiation hardness of the spectrometer components (VELO, CALO, RICH) TDR planned for 2010

Upgrade activities (CALO) Modification for the Calorimeter Electronics: fast electronics (40 MHz) Modification for the Inner part of the ECAL: Inner region replaced by a more radiation tolerant medium “Shashlyk” technology PWO crystals ? Major issue: dose on inner part of the calorimeter Tested up to 2.5 Mrad No reliable data for higher dose (up to a factor 5) → upgraded FE boards R&D underway to collect more comprehensive data

The ECAL irradiation four ECAL inner modules assembled and equipped with 36 PMTs PMTs have been checked and relative gain tabulated beam-test run held on August at SPS H4 beam-line ECAL module Garage Moving tool Integrators Source Scan with 137 Cs source (~10mCi) under inspection of PR representative

The ECAL irradiation Installation in the LHC tunnel Sept. 2, two modules installed in RB84 THANKS to LHC machine committee !!! Other two modules transported to Protvino (Sept)

Upgrade activities (VELO) strip pixel ? Upgrading the VELO to 40 MHz implies complete replacement of all modules and FE electronics Two major challenges data rate of 1300 Gbit/s radiation levels and hence thermal management of modules Important to maintain current performance by keeping material low small modules with low power thinning of sensor and electronics use of chemical vapor deposition (CVD) diamond planes for cooling and/or sensor removal/rework of RF foil

Upgrade activities (RICH) need to replace front-end electronics AND photon detectors to cope with 40 MHz readout baseline approach: keep current geometrical layout of RICH1 (aerogel+C 4 F 10 ) + RICH2 (CF 4 ) or, replace aerogel with new TOF system (TORCH) located after RICH2 for identification of hadrons with p < 10 GeV have to measure time when track entered TORCH (T torch ) with high precision O(20 ps) use thin (to minimize uncertainty on emission point) quartz block to get Cherenkov photons chromatic dispersion could compromise resolution if measurement is based on hit time (T PMT ) and path length in quartz (L) solution: a focusing system is needed to measure direction of photon θ Cherenkov to get the right Timing TOF: T PV and T torch (T PMT, L, θ Cherenkov ) Photon sensors are the critical item: multi-anode PMT (MaPMT) Hybrid Photon Detector (HPD) MicroChannel Plate (MCP) T torch T PMT

Summary the commissioning of the Calo and Muon systems is well advanced. The Russian physicists are making major contribution to the commissioning of these systems the studies of the CW bases after the modification are done with CALO monitoring system M1 installation completed successfully, commissioning ongoing global calorimeter and muon detectors commissioning as well as calibration of the CALO and MUON systems with the full readout chain and trigger logics are in progress the Muon HV system is ready for data taking

Summary continuity of “construction” funds in Russia is very important for LHCb future plans. R&D on the ECAL modules for possible LHCb spectrometer modification has been started this year. Irradiation tests are in progress (“shashlyk” and crystal options) (ITEP, IHEP, BINP, INP) participation of Russian groups in the modification of the VELO system is also expected (MSU) participation of Russian groups in the modification of the RICH system is under discussion (ITEP) further development of the soft-ware for data analysis further development of the physics program first physics run and analysis of the first physics data