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Silicon Preshower for the CMS: BARC Participation

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Presentation on theme: "Silicon Preshower for the CMS: BARC Participation"— Presentation transcript:

1 Silicon Preshower for the CMS: BARC Participation
Anita Topkar BARC

2 CMS Preshower Detector
End caps of CMS detector has ~4300 silicon strip detectors covering area of~17 m2 BARC has delivered detector modules for the CMS preshower Production of additional detectors (~400 wafers) was carried out to meet the shortfall

3 The Preshower Silicon Detector
Preshower silicon strip detector is being used for 0/ rejection in the ECAL, CMS Strips of 1.80 mm width with a pitch of 1.9 mm Area - 63mm x 63mm Detector specifications are very stringent as they are to be operated in a high radiation background of neutrons ( 2x10 14 /cm2) & gamma ( 10Mrad) for a long period of ten years

4 Technology development and production of detectors
Technology developed by BARC in eight batches using BEL facility. Knowhow for fabrication of detectors was provided to BEL Detectors were designed during various phases (prototype, preproduction, production) Characterization setups and probe jigs developed and quality control facility setup at BEL during production Quality control of detectors was carried out (BARC and Delhi university) Micromodule production facility was setup at BEL There was lot of support from CERN Preshower Group during production of silicon detectors and modules in India)

5 Front end hybrid developed by CERN
Strip Detectors for CMS Experiment at LHC, CERN Wafers designed and fabricated during various stages of development 1 2 3 Front end hybrid developed by CERN Silicon detectors produced by BARC cover an area of 40,000 cm2 in the CMS detector of LHC Detector module

6 Detector Specifications
Electrical High breakdown voltage Breakdown voltage for all strips >= 300V/500V Low leakage:Total current of all strips <= 10 μA at 300V Uniformity of all strips: Maximum 1 strip with leakage current> 5 μA at 300V Geometrical Tight control over dimensions Length mm Width , -0.1 mm

7 Detector Design Design for improving breakdown voltage &
reducing the leakage current Floating field guard rings Rounded corners Field plates

8 Fabrication Process High resistivity <111>, FZ wafers
Ion implanted junctions with oxide passivation P+ guard rings Gettering to reduce leakage currents Aluminum metallization PSG passivation on the top Fabrication process optimized in eight batches to achieve desired specifications

9 Quality control of the strip detector
Leakage current of strips, capacitance of strips, full depletion voltage, breakdown voltage, mechanical tolerances on geometry Probe-jigs to make contact to the 32 strips simultaneously Simulaneous measurement of strip current of 32 strips ( IV) Simulaneous measurement of strip capacitance of 32 strips ( CV) Probe-jigs, measurement setups required for qualification of detectors and modules were developed. Test facility was setup at BEL for qualification of detectors as per the CERN specifications

10 Performance of detectors supplied to CERN
Total current at 300V Breakdown voltage

11 Radiation hardness of sensors
Change of full depletion voltage due to a neutron dose of 2x1014 n/cm2

12 Production of sensor micromodules
Detector Ceramic tile Detector aligned and glued to ceramic tile Aluminum tile Complete micromodule with readout hybrid assembled on ladder

13 The assembled end cap with micromodules – Assembly, Installation and Commissioning by CERN
Fully assembled Preshower Dee plane

14 Participation in CMS : Benefits
Technology development for large area silicon strip detectors was Initiated Capability for large scale production for detectors using industry facilities is developed This also resulted in the development of a wide range of silicon detectors for applications in BARC and for international Experiments

15 Silicon detectors developed by BARC
Silicon microstrip detectors for PHENIX Experiment at RHIC, BNL Large area PIN diodes Pad detectors for physics experiments and radiation monitoring Silicon pad detectors for experiments at GANIL, France PIN photodiodes for scintillators & X-ray imaging

16 Thanks you

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