Fermilab PMG Meeting

1
General Quality Assurance of Silicon Sensors and
Parts Flow
DØ Inner Layer Sensor Production Readiness
Review August 08, 2003 M. Demarteaufor the
Run IIb silicon group
2
Sensor Delivery

• The production at Hamamatsu calls for the
  following delivery schedule

• The terms of the contract with Hamamatsu are such
  that the project has six months after receipt of
  the sensors to reject them

3
Parts Flow

• All sensors are checked in at Fermilab undergo
  visual inspection
• Outer Layer sensors
• Fermilab IV/CV
• 10 to Stony Brook, KSU for strip tests in ratio
  21
• Inner layer sensors
• All tests at Rochester

4
QA Program

• Sensor QA and Distribution
• Rene Jones receives sensors, enters data into
  database
• passes sensors for I-V, C-V and visual inspection
  
• Mme. Mao will do all C-V, I-V measurements and
  long-term burn-in
• Nina Ronzhina will do all visual inspection with
  Rene Jones as backup
• Ralf Bernhard will oversee the whole QA program
• backup help from Ron Lipton, Marcel Demarteau, L3
  managers
• passes 10 of sensors for mechanical measurement
  at Fermilab
• based on recommendation from L3 managers
• measurements performed on OGP by SiDet metrology
  group
• Outer layer sensors
• ship 10 of the sensors to various test sites,
  based on L3 manager recommendation
• Stony Brook KSU 2/3 1/3
• Stony Brook Bob McCarthy, Hai-Jiang Gong
• KSU Robin Sidwell, Ron Sidwell graduate
  students
• Inner layer sensors
• ship 100 to University of Rochester
• Sergey Korjenevski graduate students

5
Irradiation QA Program

• Sensor Irradiation
• All irradiation carried out at KSU JRM using 10
  MeV proton beam
• 1.5 of the test structures with diodes and baby
  sensors will be irradiated
• two sessions 2.5x1013 1MeV n equivalent/cm2 each.
  
• The depletion voltage after the integrated dose
  must not exceed 350 V and no breakdown can be
  observed at this voltage or below.
• Person in charge of irradiation at KSU is Tim
  Bolton

6
Manpower Estimates for Probing

• Based on workload, timing of actual strip scan of
  sensors using switching matrix, maintenance of
  setup, etc, determined the distribution for
  various test sites and FTEs needed

All people identified by name, and have accepted
the responsibility, for carrying out the proposed
QA program.
Manpower for measuring irradiated sensors will
come mainly from KSU
7
Database

• All information will be stored and tracked in
  database
• Adopted ATLAS database
• Old database in MySQL relied on student in
  computing department at UIC. Concerns about long
  term stability, support and flexibility motivated
  us to adopt the ATLAS database design
• Oracle based identity relationship
• Item
• Test
• Assembly
• Shipment/Tracking
• Ideally suited to silicon detector
• Official transfer of designer files from ATLAS by
  the University of Geneva
• Supported by DØ online support group
• Stan Krzywdzinski, Vladimir Sirotenko, Taka
  Yasuda, Stu Fuess
• Will provide web interface using existing tools

8
Entity Relationship

• Full entity relationship defined and implemented
  
• Database can be accessed at http//www-d0online.
  fnal.gov/sdb-dev/

9
Database Use

• Common excel format defined for all sensor tests
• Scripts have been written which take the
  information from the spreadsheets and uploads the
  information into the database
• Server at each test site with all information
• e.g. http//sbhepnt.physics.sunysb.edu/silicon/
  L2
• Same principle used for all components in the
  silicon detector

10
Conclusions

• All outstanding concerns have been addressed
  regarding
• quality control
• manpower estimates
• site verification
• tracking
• data storage and retrieval
• We believe we have a rigorous quality sensor
  control program in place
• Well defined QA procedures
• Certified test sites with trained personnel
• Sound manpower estimates and manpower allocated
  to the project
• Part tracking using Oracle database
• We thank the committee for helping us addressing
  some earlier shortcomings