Download - Department of Semiconductor Detectors

Thomas BergauerDepartmentof SemiconductorDetectors

HEPHY Scientific Advisory Board

21 Oct. 2010

Department of Semiconductor Detectors

2Thomas Bergauer21 Oct. 2010

Mission Statement• Design, construction and testing of silicon sensors and

detector modules

• Operate the semiconductor laboratory (a.k.a. “clean room”)



List of Members• Scientific (5 FTE):

– Thomas Bergauer (Belle, CMS, ILC)• AIDA WP9.4 convener

– Marko Dragicevic (CMS)• CEC convener

– Michael Hoch (CERN, CMS)

– Josef Hrubec (CMS)

– Manfred Krammer (CMS)• CMS Conference Committee Chair• Austrian RECFA representative

• Students– Two PhD students: Manfred Valentan (Belle), Stephan

Hänsel (ILC)– Three master students: Wolfgang Treberspurg, Maria

Bernard-Schwarz (CMS), Erik Huemer (CMS)

• Technicians (0.75 FTE):• Dieter Uhl (0.25 FTE, technical college)• Margit Oberegger (0.5 FTE)



Present Activities• Construction of the Belle II Silicon Vertex Detector (SVD)

– Double sided silicon sensors: design and negotiation with companies– Electrical characterization– Module assembly, beam tests, gamma-Irradiation

• R&D for CMS Tracker Upgrade: CEC collaboration– New sensor design: strixel sensors– New methods of connecting readout chip to sensor– Neutron irradiation at Vienna nuclear reactor– Development of radiation-hard silicon sensors with Austrian

semiconductor company

• Silicon Detectors for an International Linear Collider experiment – SiLC collaboration: Sensor Design,

electrical characterization, testbeams – Associated member of EUDET, Full member of AIDA (start 2011)


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Expertise: Sensor Design• Sensor design

– Design is programmed and automatically drawn

– Self-programmed software framework

• Collaboration with detector producers– Hamamatsu, Micron, ITE Warsaw

• Microscopic and spectroscopic analysis to verify actual processed sensor– Collaboration with Center for Electron

Microscopy at TU Vienna

Thomas Bergauer21 Oct. 2010


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Expertise: Electrical CharacterisationAvailable Setups:• Global IV, CV measurements• Fully automatic strip-by-strip

measurements performed by motorized XYZ-table

• Cold chuck to test at different temperatures

Goals are:• Quality assurance for mass

production (e.g. CMS, soon Belle II)• Report back to producer• Select good sensors for module

production



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Expertise: Module Construction


• Tasks to perform:• Gluing, metrology, wire-bonding

• Modules for• CMS Tracker mass production• Trapezoidal prototype modules

for Belle II


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Expertise: Beam Tests


• Regular beam tests to test sensors and modules• Usually at CERNs SPS secondary

beam lines• In cooperation with HEPHY

electronics group and international colleagues (SiLC, EUDET)

• Different main goals:• 2008: resolution studies of sensors

with different layout (ILC)• 2009: performance of double metal

layers for routing purpose (CMS)• 2010: performance of double sided

sensors with different p-stop patterns (Belle II)


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New Expertise: Neutron-Irradiation


• Irradiation of silicon sensors at TRIGA Mark II nuclear reactor at ATI Vienna (“Atominstitut der TU Wien”)• Easy access• High neutron flux

• Test of silicon sensors:• For CMS upgrade R&D• n- vs. p-type substrate• Float zone vs. mCz vs. Epitaxial material

• First in-situ temperature measurement of nuclear reactor’s irradiation channels• Necessary to know for the understanding

of the annealing behavior in silicon sensors


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New Expertise: Gamma-Irradiation


• Irradiation of prototype Belle II modules at Co-60 source in Mol, Belgium

• Test of • Silicon sensors• readout electronics, • voltage regulators,

temp/humidity sensors

• Joint effort of semiconductor/electronics department


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Expertise: Analysis


• Baby sensors using 3 different inter-strip isolation layout on n-side

sig nal [e]0 10 00 0 20 00 0 30 00 0 40 00 0 50 00 0 60 00 0 70 00 0 80 00 0 90 00 0

entr

ies

[]

0

20 0

40 0

60 0

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10 00

Mi cron_wedge_mod1_n (M icron_wedge_1) - S ignal siC2 7Ent ries 2 03 96M ean 2 .47 5e +0 4RM S 1 .15 e+ 04

/ nd f χ 1 18 5 / 64Wid th 4 6.2± 1 85 4 M P 8 1± 1 .92 1e +0 4 Are a 1 44 201± 1 .96 7e +0 7 GSig ma 7 6.7± 4 24 1

Peak = 20882.6FWHM = 66.3%

Mi cron_wedge_mod1_n (M icron_wedge_1) - S ignal

SNR [ ]0 10 20 30 40 50 60

entr

ies

[]

0

20 0

40 0

60 0

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10 00

12 00

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16 00

Mi cron_wedge_mod1_n (M icron_wedge_1) - SNR snr27Entries 20396Mean 19.27RM S 9.559

clw = 1 2 3+

Peak = 21.27FWHM = 47.3%

Mi cron_wedge_mod1_n (M icron_wedge_1) - SNR


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Main Fields of Expertise: 2009


Double metal-layer Sensor Design

Module Construction

Testbeam: 19-31. August 2009

Analysis

Electrical Characterisation

Suggestions for Improvement:

Modifications in Processing

2009: Full cycle from design to

results completed

within one year!


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Main Fields of Expertise: 2010


New Sensor Design for Belle II

New Modules

Testbeam: 27. Sept to 11. Oct. 2010

Electrical Characterisation

2010: Full cycle from design to results completed within one year again!

Inter-strip isolation layout must be

improved


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Timeline of Papers, Talks and Posters


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Diploma/PhD theses Presentations

Papers



Summary

• Department of semiconductor detectors is fully integrated in research projects:– CMS Tracker construction, R&D for upgrade– Belle II: silicon sensors, modules, beam tests– Silicon Sensors for ILC

• Close collaboration with electronics department since many developments are done together (e.g. module construction)

• Good sharing of manpower:– Permanent staff carry expertise– Students for diploma/master and PhD theses


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Tak! Danke! Grazie! Thanks!


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