Department of Semiconductor Detectors HEPHY Scientific Advisory Board 21 Oct. 2010 Thomas Bergauer.

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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)

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

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

Expertise: Module Construction

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

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

for Belle II

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)

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

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

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

Mi cron_wedge_mod1_n (M icron_wedge_1) - S ignal siC2 7Ent ries 2 03 96

M ean 2 .47 5e +0 4RM S 1 .15 e+ 04

/ nd f χ 1 18 5 / 64

Wid 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

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

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!

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

Timeline of Papers, Talks and Posters

2003 2004 2005 2006 2007 2008 2009 20100

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

Tak! Danke! Grazie! Thanks!

Department of Semiconductor Detectors HEPHY Scientific Advisory Board 21 Oct. 2010 Thomas Bergauer.

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