# Presentation: 526488

## Preparation for L2-5 silicon sensor arrival and L0/L1 PRR

- desperately expecting the first 130 L2-L5 sensors from HPK in July - probably coming in two batches only
- not yet arrived ...

- Frank Lehner
- U Zurich
- Run IIb meeting 7/24/03

## Silicon sensor arrival - preparation

- we have a detailed QA plan with established procedures
- All people involved in that business should check on _[http://www.physik.unizh.ch/~lehnerf/dzero/qa/qa.html](http://www.physik.unizh.ch/~lehnerf/dzero/qa/qa.html)_
- QA document v4.0
- definition of tests
- general procedures for testing
- note that depletion voltage determination has changed and we adopt the HPK criterion
- depletion voltage equals lowest voltage point where increase of 1/C2 versus bias is smaller than 2%
- do not need interpolations - 10 V granularity is fine
- Sensor QA part flow v2.0
- detailed part flow for testing
- timing estimates
- Procedures for sensor visual inspection v1.1
- Guidelines for clean room and sensor S&H v2.0

## Sensor arrival - preparation

- testing sites have started to setup www accessible directories for excel spreadsheets
- FNAL: http://d0server1.fnal.gov/users/lipton/www/asptest/sensor_test.html
- KSU: http://www.phys.ksu.edu/hep/dzero/Testing
- SB: http://sbhepnt.physics.sunysb.edu/silicon/
- UR: tbd
- spreadsheets will be copied (raw) into database
- only summary info on a special sheet will be transferred into ORACLE tables (via perl scripts)
- spreadsheet templates exist on http://www.physik.unizh.ch/~lehnerf/dzero/db/db.html  and http://www.phys.ksu.edu/~evt/D0database

## Sensor arrival - preparation

- following spreadsheet exists now (see E.v.T. talk):
- sensor_manufacturerinfo (for FNAL)
- sensor_keytest (for FNAL L2-L5 and UR L0/L1)
- sensor_fullstriptest (for SB, UR, KSU)
- sensor_irradiation (for KSU)
- sensor_mechanical (for FNAL, specific data format)
- sensor_finalgrade (for Zurich, UR)
- templates on http://www.physik.unizh.ch/~lehnerf/dzero/db/db.html and http://www.phys.ksu.edu/~evt/D0database
- please use these formats:
- use consistent units: pF, nA, MOhm, V, pA/V
- charts are optional and up to the testing site
- use consistent file naming containing sensor type and number, location, date and spreadsheet type
- comment if necessary asap

## Sensor arrival - preparation

- Key tests:
- initial registration into DB (Nina R.)
- checking paperwork/floppy disk from vendor for completeness
- use of old-fashioned log book for sensor arrivals
- checking if accompanying test structure has been shipped
- inserting vendor info into “sensor_manufacturerinfo” spreadsheet
- visual inspection (Nina R.)
- visual inspection station in Lab A set up
- I will train her the next days
- follow visual inspection guidelines
- use traveler form during inspection (form attached to visual inspection guide line)
- insert main visual inspection comment into “sensor_manufacturerinfo” spreadsheet

## Visual Inspection Traveler

- traveler is supposed to guide technician through the visual inspection steps
- only major comments will be entered in sensor_manufacturer-info spreadsheet
- estimate time for visual inspection: 20 minutes

## Sensor arrival - preparation

- Key tests cont’d:
- IV and CV for all sensors
- FNAL: L2-L5 (Md. Mao, R. Lipton)
- UR: L0, L1 (R. Demina, S. Korjenevski)
- FNAL: 5% per batch I-stabil test for 24h
- select sensors with suspicious I-V curves & flaws from visual inspection
- enter data or work on program to transfer data into sensor_keytest spreadsheet

## Sensor arrival – preparation

- 10% L2-L5 full strip test (FST) at KSU (35%) & SB (65%)
- FST information goes into “fullstriptest” spreadsheet
- summary sheet contains averages
- for averaging leave out bad channels
- charts in spreadsheet optional
- initially 10% sensors per batch will be mechanically measured on OGP at FNAL
- measure: thickness, flatness, cut tolerances 2x (sides and ends)
- operator: Gordie G. – program on OGP ready
- sensors which show chips/cracks at edges during visual inspection have to be measured
- Jim provided mechanical data format containing target values and mech. grading

## Sensor arrival – preparation

- irradiation test and IV & CV characterization at KSU
- 1.5% of the sensors (irradiation on baby detector and/or test diodes)
- two irradiation steps up to 2.5·E13 10 MeV p/cm2
- irradiate roughly half of the baby detectors which are at KSU anyway for FST tests
- L0 & L1 baby detectors have to be shipped from UR to KSU for irradiation

## Sensor QA plan

## Sensor arrival – preparation issues

- grading:
- in the beginning done by FL/RD
- filled in sensor_finalgrade spreadsheet
- will wait with this to get a more complete picture of first batches
- www access @ FNAL
- have to setup a d0server1 www-directory for access to spreadsheets/data for manufacturer_info, key-tests and mechanical results: Ron’s www-directory ?
- sensor storage @ FNAL
- all incoming L2-L5 sensors will be stored during key tests in Lab A
- dry boxes for sensor storage ordered
- after the key tests the sensors, which will not leave FNAL, will be stored in Lab C
- sensor shipping
- read S&H guideline
- do not ship more than 5 sensors per shipment

## L0/L1 PRR preparation

- L0/L1 PRR will be on August 8th, 9 a.m. CT
- documents & infos posted on _http://www.physik.unizh.ch/~lehnerf/dzero/prr/prr_l1.html_
- following documents are prepared and are more or less finalized
- Note on electrical characterization of L1 sensors
- editors: Marcel & Frank
- status: 2nd version exists
- plots and results complete
- waiting for feedback
- should we include results from 3 new L1 sensors?
- Note on irradiation of L1 sensors
- editor: Frank
- status: version 2.5
- plots and results complete
- results on strip capacitance are a somewhat weaker point, went up from 1.1 pF/cm to almost 1.5 pF/cm
- results on strip capacitance versus HV after irradiation thanks to Md. Mao

## L0/L1 PRR preparation

- Note on comparison of strip measurements between SB and KSU
- editor: Bob
- status: 2nd version exists (from July)
- gives a very nice overview, shows the overall good agreement between KSU and SB on many measurements with some exceptions though
- wait for results on four sensor comparison
- Note on fluence determination and dosimetry checks at KSU irradiation facility
- editor: Tim
- status: 2nd version exists (from July)
- contains leakage current vs. fluence plots which are also in the other note
- have different values for alpha (10 MeV p) due to different data sets
- Tim: 7.9E-17 A/cm using L1-11/12, L2-59/62
- Frank: 11.6E-17 A/cm using L1-11/12, L2-59/62 and testdiodes
- foil activation double check between FNAL & KSU within ~20%

## L0/L1 PRR preparation

- older note on L2 irradiation document for L2-L5 PRR from March 6, 2003
- editor: Regina & Tim
- status: updated by Tim last week
- changed all relevant fluence numbers in plots from 1 MeV eq. n to 10 MeV p
- alpha for 10 MeV for L2-59/62 is low: 6.8E-17 A/cm
- other existing notes:
- quality assurance document v4.0 -> will do some smaller typo corrections
- visual inspection guidelines v1.1
- sensor S&H document v2.0
- generally in good shape ...

## L0/L1 PRR preparation

- all documents released to PRR committee by latest mid of next week
- everybody, please read and send comments in to all notes
- again, all notes are posted on:
- http://www.physik.unizh.ch/~lehnerf/dzero/prr/prr_l1.html

## L0/L1 PRR preparation

- first suggestions how to organize the PRR session (expect 3h in total):
- 20+5’ talks on
- general project overview
- response to L2-L5 PRR findings/comments
- presentation of general sensor QA program
- sensor characterization of L1 sensors
- probing comparison between FNAL/KSU/SB
- irradiation results on L1 & test diodes
- flux normalization cross checks
- need video link to SLAC, UR, SB, KSU, Zurich