25 April 2013 Thomas Bergauer (HEPHY Vienna) Components and ladder quality control and testing procedures Belle II Vienna-Pisa meeting.

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25 April 2013 Thomas Bergauer (HEPHY Vienna) Components and ladder quality control and testing procedures Belle II Vienna-Pisa meeting

Components and ladder quality control and testing procedures SENSOR CHARACTERISATION Thomas Bergauer (HEPHY Vienna)25 April 20132

Components and ladder quality control and testing procedures Sensor Accounting Thomas Bergauer (HEPHY Vienna)25 April Two vendors, three layouts Layer# of Ladders Rect. Sensors [narrow] Rect. Sensors [wide] Wedge Sensors APVs Sum:

Components and ladder quality control and testing procedures Rectangular Sensors from Hamamatsu HPK re-started production of DSSDs on 6” wafers Old 4” production line was decommissioned We evaluated first batches Quality was constantly improving and is now at an acceptable level Technical details (layers 4,5,6): Dimensions: 59.6 x mm 2 p-side: 768 strips, pitch: 75 µm n-side: 512 strips, pitch: 240 µm Thomas Bergauer (HEPHY Vienna)25 April 20134

Components and ladder quality control and testing procedures Trapezoidal Sensors from Micron Trapezoidal sensor for forward region Different p-stop layouts on test sensors Atoll p-stop Common p-stop Combined p-stop, Favoured by: [1] IEEE Transactions On Nuclear Science 45 (1998) Iwata et.al [2] IEEE Transactions On Nuclear Science 45 (1998) Unno et.al Thomas Bergauer (HEPHY Vienna)25 April 20135

Components and ladder quality control and testing procedures Modules for Beam Test 2010 Read out by APV25 (CMS) Baby Module used to verify p-stop geometries: Baby Module Atoll p-stop Common p-stop Combined p-stop Thomas Bergauer (HEPHY Vienna)25 April 20136

Components and ladder quality control and testing procedures Signal-to-noise-ratios Dark colors: non-irradiated, Light colors: irradiated Atoll pattern (half-wide) performs best, both irradiated and non- irradiated Charge accumulation in non-implanted regions after irradiation Test sensors have been Gamma-irradiated with Co-60 (70 Mrad) Tested before and after at CERN beam test (120 GeV hadrons) Thomas Bergauer (HEPHY Vienna)25 April 20137

Components and ladder quality control and testing procedures New prototype order with Atoll p-stop Three new masks ordered at Micron Semiconductor –P-stop, metal, via P-stop: Atoll pattern (half- wide) [like HPK n-side] Three prototype detectors ordered in 2012 –Delivery for spring 2012 –beam test and irradiation summer/autumn 2012 Order placed for mass production beginning 2013 Thomas Bergauer (HEPHY Vienna) 25 April

Components and ladder quality control and testing procedures Optical inspection Scratches & Marks Round scratches –occur on every sensor –maybe due to automatic sensor handling? Thomas Bergauer (HEPHY Vienna)25 April 20139

Components and ladder quality control and testing procedures Strip-by-strip Test Setup Sensor in Light-tight Box Vacuum support jig is carrying the sensor –Mounted on movable table in X, Y and Z Needles to contact different structures on sensor What do we test? –Electrical parameters –strip failures Thomas Bergauer (HEPHY Vienna)25 April

Components and ladder quality control and testing procedures Open Strip: Shorted Strip: “Pinhole” (short between implant and metal): Common strip failures Open bias resistor: Open implant at via: Open implant: 25 April 2013Thomas Bergauer (HEPHY Vienna)11

Components and ladder quality control and testing procedures What do we test? Global parameters: –IV-Curve: Dark current, Breakthrough –CV-Curve: Depletion voltage, Total Capacitance Strip Parameters e.g. –strip leakage current I strip –poly-silicon resistor R poly –coupling capacitance C ac –dielectric current I diel Thomas Bergauer (HEPHY Vienna) 12

Components and ladder quality control and testing procedures Switching Scheme Thomas Bergauer (HEPHY Vienna)25 April

Components and ladder quality control and testing procedures Direct measurement of oxide thickness by electron microscopy SEM result: 355 nm average from C_ac measurement: 354 nm Vendor average: nm Measurement validation 25 April 2013Thomas Bergauer (HEPHY Vienna)14

Components and ladder quality control and testing procedures Measurement of the inter-strip resistance A -100V GND Electrometer SMU 1 GND 0...3V (5V) GND A SMU 2 applies bias voltage ramps potential on neighbouring DC pad -> Bias resistor value from slope of current Current at 0V is strip leakage current, interstrip resistor value from slope of current when ramping 25 April 2013Thomas Bergauer (HEPHY Vienna)15

Components and ladder quality control and testing procedures Full Strip-by-strip results 16Thomas Bergauer (HEPHY Vienna)25 April 2013

Components and ladder quality control and testing procedures METROLOGY DURING LADDER ASSEMBLY Thomas Bergauer (HEPHY Vienna)25 April

Components and ladder quality control and testing procedures Wire bonding Ultrasonic welding technique 25 micron bond wire of Al-Si-1% Thin Wedge usually used for 17.5um wire Pull-tests to verify bond quality Thomas Bergauer (HEPHY Vienna)25 April

Components and ladder quality control and testing procedures Mechanical parameters Measurement of –Mechanical precision of CF ribs –Alignment of sensors w.r.t hybrid Using 3D mechanical measurement system Coordinate measurement machine (CMM) Thomas Bergauer (HEPHY Vienna)25 April

Components and ladder quality control and testing procedures LADDER TESTING Thomas Bergauer (HEPHY Vienna)25 April

Components and ladder quality control and testing procedures Box with motorized XZ Table Setup built for automatized ladder tests in Vienna Motorized stages remotely controllable via TCP/IP HPK mini-PMT with Scintillator for triggering Thomas Bergauer (HEPHY Vienna)25 April

Components and ladder quality control and testing procedures The setup DUTs on x-z-table Scintillator and photomultiplier for trigger Joystick for moving the x-y-table (one of many interfaces for user error…) Thomas Bergauer (HEPHY Vienna)25 April

Components and ladder quality control and testing procedures Thomas Bergauer (HEPHY Vienna)25 April

Components and ladder quality control and testing procedures LADDER AGING AND BURN-IN Thomas Bergauer (HEPHY Vienna)25 April

Components and ladder quality control and testing procedures Climate Chamber Key parameters: Volume 350l Space for 5 ladders Temperature range -40 up to +200 degC Rel. Humidity 0 to 95% Order placed mid March Will be delivered in June this year Will be used for: Burn-in tests at elevated temperature –60-80 degC –For durability checks of design (on pre-production ladders) Thermal cycling –To verify proper function of every single ladder 25Thomas Bergauer (HEPHY Vienna)25 April 2013

Components and ladder quality control and testing procedures CONSTRUCTION DATABASE How to store metrology data? Thomas Bergauer (HEPHY Vienna)25 April

Components and ladder quality control and testing procedures Belle II construction database Aim is to keep track of each (expensive) component: –Sensors –Hybrids –Modules –Ladders => Logistics: Registration, Shipments, Assembly Add measurement results Thomas Bergauer (HEPHY Vienna)25 April

Components and ladder quality control and testing procedures Key features User access system (benefit of CakePHP framework) –Authentication –User/Group permissions Logistics Module [already implemented] –Registration: “Add item” –View Inventory of one or all “locations” –Location is e.g. HEPHY, KEK, IPMU,… Measurement module [not yet implemented] –Store measurement results –Retrieve data with nice-looking plots Administration Module [already implemented] –Add/change/remove users and groups –Add new “locations”, “item types”,.. Let’s have a look to each of those… Thomas Bergauer (HEPHY Vienna)25 April

Components and ladder quality control and testing procedures User access system Individual user accounts Linked to location, e.g. user Bergi=HEPHY Thomas Bergauer (HEPHY Vienna) 25 April

Components and ladder quality control and testing procedures Logistics Module To view and search for inventory. Works only if Each new component is entered –“Add item” page Shipments are entered –“Transfer” page Assembly steps are followed in the db –“Assembly” page Thomas Bergauer (HEPHY Vienna) 25 April

Components and ladder quality control and testing procedures Measurement module: not yet implemented Upload measurement results as ASCII files directly to web server (HTTP POST command). Can be done –directly from measurement software (e.g. Labview) –Manually Uploaded ASCII files will be parsed at server side and data will be put into database Query module will allow to retrieve data (e.g. position of non-working strips) and nice-looking plots (e.g. IV curve on sensor) Thomas Bergauer (HEPHY Vienna)25 April

Components and ladder quality control and testing procedures Summary Sensor tests well defined –Fraction of full strip-by-strip scan not yet defined (rely on tests done by vendor) Metrology during ladder assembly via CMM Climate chamber to be commissioned for burn-in and thermal cycling Web-based logistics database for SVD has been implemented at Thomas Bergauer (HEPHY Vienna)25 April

Components and ladder quality control and testing procedures END Thomas Bergauer (HEPHY Vienna)25 April