The TOTEM Detector at LHC

Transcription

1 The TOTEM Detector at LHC CMS TOTEM Gennaro Ruggiero /CERN-PH on the behalf of the TOTEM Collaboration TOTEM Collaboration: Bari, Budapest, Case Western Reserve, CERN, Genova, Helsinki, Penn State, Pisa/Siena, Prague, Tallin (~ 80 physicists) Frontier Detectors for Frontier Physics 11 th Pisa meeting on advanced detectors La Biodola Isola d Elba Italy May 24-30, 2009

2 Experimental layout of the TOTEM Detector RPS T2 T1 IP5 Focusing on: Total pp cross-section Elastic Scattering Diffraction Forward physics T1 T2 Rap gaps & Fwd particle flows measured with inelastic telescopes (T1 and T2) Leading protons measured with Roman Pot Stations (RPS) at 147m, 220m from the IP RPS

3 The inelastic forward charged particle detectors CMS muon end-cap T2 Telescope T1 Telescope Vacuum Chamber Vacuum Chamber Measurement of the inelastic rates identifying beam-beam events with detectors capable to trigger and reconstruct the inter vertex Cathode Strip chambers (CSC) for T1 Gas Electron Multiplier chambers (GEM) for T2

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5 T1 with Cathode Strip Chambers (CSC) 3m CMS muon end-caps IP 3.1 <? < 4.7 T1 5 planes with measurement of 3 coordinates per plane 3 deg rotation and overlap between adjacent planes Primary vertex reconstruction allows background rejection Trigger with anode wires

6 Production of CSCs Production at Gatchina (PNPI): 70 CSCs Test and assembly done at Genoa and CERN Acceptance tests: HV, gas tightness and gas gain uniformity Ageing studies at the GIF: 12-month test with ~0.07 C/cm accumulated charge on wires corresponding to ~ 5 years at L=10 30 cm -2 s -1

7 CSC test stand for commissioning with Cosmic Rays in Genoa CSCs CSCs tested with complete readout chain cosmic rays data for testing the complete reconstruction chain written and integrated in the TOTEM off-line framework, based on CMSSW

8 ¼ T1 Telescope complete with CSC chambers 15 CSCs mounted 3 by 3 Tilt between layers

9 Two trusses with rails will be fixed to the internal walls of CMS return yoke Installation of T1 in CMS paired bare support structures aluminum truss adaptor bracket fixing block Redesigned, now in production INSTALLATION OF T1 FORESEEN FOR SEPTEMBER, AFTER THE CMS CRAFT

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11 T2 with Gas Electron Multiplier (GEM) F. Sauli, L. Ropelewski (1997) θ Ar/CO 2 70/30 gas mixture θ Operating gas gain M = 8000 θ Digital readout (VFAT) θ Triple GEM technology adequate for T2 up to L=10 33 cm -2 s -1 strips Pads: ~2x2 mm 2 - ~7x7 mm 2 pads 65(f ) x 24(?)= 1560 pads Strips: 256x2 (width 80? m, pitch 400? m) Acceptance tests: Leakage current, optical scanning, Final assembly at CERN Production at Helsinki es (foils); gas sealing, humidity...

12 TOTEM T2 integration with CMS Castor Castor Collar Beam T2 GEM Insertion design together with CMS 10 triple-gem planes on each side of the IP to cope with high particle fluxes. 5.3 <? < 6.6

13 Commissioning with cosmic rays In these tests we used the readout chain, the HV and the LV supplies foreseen for the final system in IP5. Before the installation each assembled quarter is tested with cosmic rays.

14 Installation of T2 in CMS 1Gquarter Installed in the minus far side 2 nd 3 rd 2Gquarter Installed in the plus far side 3Gquarter Installed in the plus near side 4Gquarter Will be installed in the next days Far Near

15 The Roman Pots with Silicon Detectors Roman Pot Unit Horizontal Pot Vertical Pots BPM Roman Pot Detector Packages Maximize acceptance at low t : edgeless Si-detectors minimized space between detector edge and window minimized window thickness 10s beam Detectors overlap in the data taking position

16 The Detector Package (DP) Roman Pot Motherboard The Hybrid Kapton pigtail CE07 support plate 24 Detector Packages over >440m ( r/o channels) The Champignon 5 uconnectors & 5 v oriented to detector planes hybrids VFAT chips The Si microstrip edgeless detector Si microstrip edgeless detector

17 The Pot 150µm (20µm planarity) 500µm Separates the high vacuum of the machine from the detector s vacuums. Ferrite 150µm When the RP is in the Data taking position will approach the 10s of the beam.

18 The Edgeless Silicon Detector (I) υ υ Very High Resistivity Si n-type <111>, 300um thick, Vdep=20V Standard planar technology fabrication / dicing with diamond saw υ Single sided detector, 512 microstrips (pitch 66um) υ Pitch adapter on detector (VFAT / APV25 compatible) υ strips at 45Gfrom the sensitive edge υ AC coupled (punch-through) EDGELESS DETECTORS with Current Terminating Structure G. Ruggiero, V. Eremin et al. ( CERN/PH-TOT, Ioffe PTI- St. Petersburg, RIMST- Zelenograd)

19 The Edgeless Silicon Detector (II) Current Terminating Structure Surface Current Suppression ICTR +ICR IBE Radiation Hardness *10 pcm Efficiency at the edge -2 Efficiency *10 pcm *10 pcm Bias Voltage, V 500-2

20 Commissioning of the DPs with beams in H8 DCS Monitoring Panel Commissioning setup in H8 Cooling and Vacuum station Alignment control

21 ALL 4 Roman Pot Stations Installed in 07 First 2 Detector Packages installed last summer All Detector Packages installed for the RPS at 220m in sector 56 last April Completion of the RPS at 220m in sector 45 foreseen for the beginning of July Roman pots at 220m

22 System Tests in the Tunnels Staging strategy for 2008: 2 Detector Packages on both sides of IP5 Mini-DCS and DAQ serving the first two pots Cooling commissioning Contorl and r/o tests Radmon and all environmental sensors monitored from September to November 2008

23 The TOTEM Readout Electronics CCU RadMon ONLY 1 architecture to accommodate CC 3 DIFFERENT and SEPARATED detectors MOTERBOARD TM Tracking data Rack 220 GOHs m 147 DOBm Trigger data Anode CCUM frontend card Carriers with VFATs hybrid with CCUM VFATs and Si TTC data HORSESHOE detector 128 channels of DOHtracking TTC front data end DOH no Cardon-detector coincidence, digital trigger storage and DOH M TTC data data transmission, formation in counting VFAT room 8only programmable trigger outputs, designed for radiation tolerance DOHM (P. Aspell, W. Snoeys et al.). ROMAN POT T1 CC Cathode CCUM frontend card 11 th CARD with VFATs Pad VFAT TMC Strip VFAT GEM Tracking data Raw trigger data TTC data GOHs TOB Readout Card CCUM T2 Tracking data Readout data Raw trigger data Trigger data Connection to CMS DAQ with S-Link on TOTFED (for common runs at a later stage

24 SUMMARY (TOTEM coarse History) 2009: Complete the Prototyping On/Near to first installations Detectors to Cards be ready for production of the restart of LHC : sensors T2 now... Proof of Concept for RPs at 220m in early July the 3 Sensor T1 in September Technical VFAT (design Design First installations to (RP and T2) Report production) 2007> >

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26 Commissioning of the 3 TOTEM Detectors CONTROL PANEL (configuration and readout) Front-end probe and mapping Configure and run the system for detector calibration Possibility of running with external trigger DATA QUALITY MONITORING Data consistency check Calculation of calibration parameters Histogram inspection Monitor snapshot- Cosmic run in H8

27 TOTEM will focus on: Total cross-section COMPETE Coll. [PRL 89, (2002)] Elastic Scattering s tot = ± mb s T 16p ( dn / dt) el t= 0 = 2 1+ r N el + Ninel Accuracy 1% with ß*=1540m final 5% with ß*=90m early But also Diffraction, soft and hard, forward physics Common physics program with CMS at a later stage