Production and Quality Assurance of Detector Modules for the LHCb Silicon Tracker

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1 Production and Quality Assurance of Detector Modules for the LHCb Silicon Tracker Olaf Steinkamp for Dmytro Volyanskyy Physik-Institut der Universität Zürich 10th ICATPP Conference on Astroparticle, Particle, Space Physics, Detectors and Medical Physics Applications Villa Olmo, Como, Italy (8-12 October 2007) 10th ICATPP Conference (Como), page 1

2 The LHCb experiment at the LHC The LHCb experiment: CP violation and rare decays in the B system L = inter/cm2 s 1012 bb pairs/year! A single-arm, forward spectrometer: Tracking: VELO, TT, Magnet, T1-T3 Particle ID: RICHs, Calorimeters, Muon Stations LHCb Silicon Tracker project = The Trigger Tracker + The Inner Tracker 30 scientists from 4 countries ~12 m2 of sensitive surface with silicon microstrip detectors (SSD) ~272k readout channels 10th ICATPP Conference (Como), page 2

3 Trigger Tracker detector design (1) 4 detection layers: 0o, +5o, 5o, 0o topology allows 3d track reconstruction 7-sensor long modules ( and 4-3 types) all r/o hybrids at one of the module up to 4-sensor long readout sectors Kapton interconnects for inner r/o sectors Main concerns in design phase: Cover the complete LHCb acceptance! 896 Si-sensors 280 r/o sectors ~143k r/o channels ~7.7m2 total active area material budget r/o hybrids outside acceptance cost = number of r/o channels long strips (up to 37cm) & large pitch (183μm) S/N for long r/o strips 10th ICATPP Conference (Como), page 3

4 Trigger Tracker detector design (2) Charge particle fluxes of about cm 2s 1 are expected in the innermost region of the TT! Detector box: the detection layers of the Trigger Tracker are enclosed in a common thermallyinsulating box that also provides electrical and optical shielding and mechanical support. Two C-shaped frames: TT can be split into two movable halves for detector maintenance 10th ICATPP Conference (Como), page 4

5 Inner Tracker detector design (1) 3 stations 4 boxes in each 4 layers in each box with 0o, +5o, 5o, 0o topology IT covers only ~1.3% of the surface of the tracking stations, but ~25% of all charged particles will pass through the IT! Charge particle fluxes of about cm 2s 1 are expected in the innermost region of the IT! 10th ICATPP Conference (Como), page 5

6 Inner Tracker detector design (2) 1-sensor module: 1 sensor modules above/below beam pipe 2 sensor module right/left of beam pipe 1 r/o hybrid per module Main concerns in design phase: 504 Si-sensors ~130k r/o channels ~4.2m2 total active area material budget sensor thickness (320μm/410μm) cost = number of r/o channels large pitch (198μm) 10th ICATPP Conference (Como), page 6

7 Detector R&D (1) Verify the detector concept, find the optimal detector parameters,... I. Using a pulsed infra-red laser (UZH) Pulsed 1064nm laser diode; Focusing optics: a spot size of ~10μm; Stepper motor: a step size of ~5μm; To investigate: signal pulse shapes & charge collection as a function of : different detector designs; operational parameters; position of the laser beam; II. At the X7 test-beam facility at CERN 120 GeV/c π beam; Beam telescope: to determine the impact point; Scintillation counters: to trigger the r/o electronics; To investigate: the signal pulse shapes & charge collection; S/N performance; hit finding efficiency; 10th ICATPP Conference (Como), page 7

8 Detector R&D (2) A selection of the results for the CMS3+Flex prototype module Laser Tests: Beam Tests: One of the main findings from R&D 10th ICATPP Conference (Como), page 8

9 Trigger Tracker module production (1) In total 148 half-modules have been produced (09/ /2006) STAGE I : 7 Si-sensors and the lowest r/o hybrid are placed on an assembly template Measure and correct alignment Glue support rails along the sensor edges Measure final sensor alignment Glue HV cable along back of module Connect GND and bias voltage (soldering & bonding) Bond sensors and pitch adapter 4 sensor long r/o sector is fully operational 10th ICATPP Conference (Como), page 9

10 Trigger Tracker module production (2) STAGE II: Glue Kevlar protection caps over bonds Assemble, bond and mount Kapton interconnect cable and upper r/o hybrid Solder GND connections to lower hybrid 3(2) sensor long r/o sector is fully operational STAGE III: Only for modules repeat stage II steps for 3rd r/o sector 1 sensor long r/o sector is fully operational 10th ICATPP Conference (Como), page 10

11 Inner Tracker module production In total, about 415 modules have been produced (01/ /2007)! Position and glue r/o hybrid and pitch adapter onto the sandwich support r/o functionality test Position and glue Si sensors Measure sensor alignment Bond hybrid and pitch adapter, bond GND and bias voltage to the sensor(s) HV test Bond all readout strips 10th ICATPP Conference (Como), page 11

12 Quality Assurance Quality Assurance (QA) programme: to ensure that the detectors meet the electrical and mechanical requirements and to study their characteristics. A crucial role in the QA programme the Burn-In test! Investigate the long-term behavior of the half-modules ; Study their electrical characteristics ; at different thermal conditions Search for defective channels ; Gain experience in the use of the LHCb electronics ; A sketch of the TT burn-in test stand at UZH: 10th ICATPP Conference (Como), page 12

13 TT burn-in test-stand Standard Burn-In programme included: Temperature cycling (between room temperature and +50 C); IV scans ; Pedestal runs ; A typical Burn-In programme took 36 hours! Pulse shape scans ; Charge collection scans ; Impossible to carry out the programme for each half-module manually!!! Need to AUTOMATE the Burn-In test stand!!! 10th ICATPP Conference (Como), page 13

14 Software to control the TT burn-in test Based on the LabView including C/C++ shared libraries Allowed to perform Extensive and uninterrupted test programmes! The Burn-In programme was running fully automatically!!! Operator intervention was limited to: search for defective channels; exchanging the half-modules. 10th ICATPP Conference (Como), page 14

15 IT burn-in test-stand Test stand at CERN: Measurement programme similar to TT : Temperature cycling (between +400 C and 50 C); IV scans ; Pedestal runs ; Pulse shape scans; A typical Burn-In programme took 48 hours! 10th ICATPP Conference (Como), page 15

16 Some examples Leakage current as a function of time and as a function of the bias voltage Identify defective strips (interrupts,shorts,pinholes) Pulse shape scan from analysis of noise and test-pulse data 10th ICATPP Conference (Como), page 16

17 Installation / Commissioning The LHCb Silicon Tracker is now under installation TT: Test assembly of detector box in the lab extensive mechanical and thermal test Detector box installed in the experiment Modules will be installed soon IT (12 individual detector boxes): Half of the boxes are assembled 10th ICATPP Conference (Como), page 17

18 Summary & Outlook Production of detector modules for the LHCb Silicon Tracker has been completed. Overall quality of the modules is very good! Fraction of defective channels is very low (0.13% for TT and 0.1% for IT). Leakage currents at 500V and at room temperature are typically below 0.4 μa per sensor. A small number of modules were graded as spares due to higher or unstable leakage currents at 500V. Noise + pulse shapes are consistent with an expectation. Around 2 TByte of data have been accumulated in the TT burn-in tests alone. Detector installation has started and will be completed by the end of th ICATPP Conference (Como), page 18

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