russian groups in lhcb: status report v. egorychev cern-russia jwg, october 2009
TRANSCRIPT
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
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 137Cs 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 137Cs 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 7th 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 systemAll 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 takingReplacing of 1 G resistorsin 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 shiftsParticipation 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 modificationBaseline scenario: increase our luminosity from 2x1032 to 2x1033cm-2s-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 pT 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 MradNo 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 19-20 at SPS H4 beam-line
ECAL module
Garage
Moving tool
Integrators Source
Integrators Source
Scan with 137Cs source (~10mCi) under inspection of PR representative
The ECAL irradiation
Installation in the LHC tunnelSept. 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 performanceby 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+C4F10) + RICH2 (CF4)
• 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 (TPMT) and path length in quartz (L)
solution: a focusing system is needed to measure direction of photon θCherenkov to get the right Timing
• TOF: TPV and Ttorch (TPMT , L, θCherenkov)
Photon sensors are the critical item:
• multi-anode PMT (MaPMT)• Hybrid Photon Detector (HPD)• MicroChannel Plate (MCP)
T torch
TPMT
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