03 Dec 2002CMS Week - Bonding WGSalvatore Costa - Catania

Status Report on Status Report on BondingBonding at at CataniaCatania

Salvatore Costa

University and INFN – Catania

03 Dec 2002CMS Week - Bonding WG 2 Salvatore Costa - Catania

Real Module Bonding

The first real module bonded in Catania was bonded early August 2002, just before our clean room was shut down for transfer to new Department Building.

It is a TIB module with two 512-strip old CSEM sensors.

Loop height of 150 (m or .1 mil ?) was used (too low for current thinking).

03 Dec 2002CMS Week - Bonding WG 3 Salvatore Costa - Catania

Test of Real Module Bonded

Could not read module in Catania. Being the CMS-like system setup in Catania also relatively recent, we weren’t sure whether problem had been introduced by Bonding or was in Test system. Brought Module to Florence were a test setup was in operation.

Enrico Scarlini (who our technician Nunzio Giudice learns from, besides learning from Paolo Tempesta) judged all readout bonds good and correctly done (although with insufficient loop height for the current prescription), and all bias bonds also correct except for one from the bias ring to a HV capacitor pad.

The bad bias bond had to be redone and after redoing the Module was successfully read in Florence.

03 Dec 2002CMS Week - Bonding WG 4 Salvatore Costa - Catania

The Bad Bias Bonds

03 Dec 2002CMS Week - Bonding WG 5 Salvatore Costa - Catania

Explanation from our Florence colleagues…

Due to insufficient loop height, a likely flexing of the Module may have caused the bond wire to touch the p+-implanted line, which thus went to same voltage as the back of the Si, i.e. HV. This effectively shorted ground and back together.

So, as soon as powered, Module drew maximum current. High current burnt tiny contact surface between wire and

silicon and spawned oxide formation on the bond foot. This prevented further correct biasing of the Module even

though after moving the Module around, wire would no longer touch p+-implanted line.

03 Dec 2002CMS Week - Bonding WG 6 Salvatore Costa - Catania

Test Results before Bonding

• Noise (by ARC) • Calibration (by ARC)

03 Dec 2002CMS Week - Bonding WG 7 Salvatore Costa - Catania

Test Results after Bonding(by CMS-like)

03 Dec 2002CMS Week - Bonding WG 8 Salvatore Costa - Catania

Cold Boxes

Catania is in fact producing Cold Boxes for all INFN bonding CentersBoxes produced and distributed: 4

(at Catania, Bari, Firenze, Pisa)Boxes under construction: 2

(for Padova and Torino)

03 Dec 2002CMS Week - Bonding WG 9 Salvatore Costa - Catania

Test Systems

CMS-like is fully operational, as has been for a while already

ARC installed butStruggled for some time to make it work until a

hardware problem was found in a cardProblem repaired, ARC has been tested to the

extent that this is possible without connecting it to anything internally working

Next week I will organize a real Module readout with ARC

03 Dec 2002CMS Week - Bonding WGSalvatore Costa - Catania

…break…

03 Dec 2002CMS Week - Bonding WGSalvatore Costa - Catania

DataBase Interface DataBase Interface UpdateUpdate

Salvatore Costa

University and INFN – Catania

03 Dec 2002CMS Week - Bonding WG 12 Salvatore Costa - Catania

Interface Dev Status

Little progress since last Mtg, Oct 22, due to teaching duties Will resume working on it from Dec 10 and still hope to

deliver full, talking to TrackerDB, v. 1.0 around Christmas A.Profeti has started inserting from Pisa Pull Test data even

as v.0.2 does not yet transmit such data to TrackerDB. I’ve begun saving and regualarly backing up evry night inserted data for later shipping to TrackerDB

Played with Relay Appl to query TrackerDB from within my Perl scripts and it woks indeed

Got some suggestions on rearrangement of present variables among Tables

Still waiting for written description of some more useful variables to add

03 Dec 2002CMS Week - Bonding WG 13 Salvatore Costa - Catania

Center “DB Readiness”

Center DB Responsible Form Defaults

Aachen Wolfgang Braunschweig MISSING

Bari Valeria Radicci OK

Catania Salvatore Costa OK

CERN Alan Honma OK

FNAL Bill Kahl OK

Firenze Simone Paoletti OK

Karlsruhe Hans-Jürgen Simonis OK

Padova Maurizio Loreti IN PROGRESS

Pisa Andrey Starodoumov IN PROGRESS

Santa Barbara Bill Kahl OK

Strasbourg Pierre Juillot OK

Torino Ernesto Migliore OK

Vienna Thomas Bergauer OK

Zurigo Klaus Freudenreich OK