Status Report on Bonding at Catania

1
Status Report on Bonding at Catania

• Salvatore Costa
• University and INFN Catania

2
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 (mm or .1 mil ?) was used (too
  low for current thinking).

3
Test of Real Module Bonded

• Could not read module in Catania. Being the
  CMS-like system setup in Catania also relatively
  recent, we werent 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.

4
The Bad Bias Bonds
5
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.

6
Test Results before Bonding

• Noise (by ARC)

• Calibration (by ARC)

7
Test Results after Bonding

• (by CMS-like)

8
Cold Boxes

• Catania is in fact producing Cold Boxes for all
  INFN bonding Centers
• Boxes produced and distributed 4 (at Catania,
  Bari, Firenze, Pisa)
• Boxes under construction 2 (for
  Padova and Torino)

9
Test Systems

• CMS-like is fully operational, as has been for a
  while already
• ARC installed but
• Struggled for some time to make it work until a
  hardware problem was found in a card
• Problem 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

10

• break

11
DataBase Interface Update

• Salvatore Costa
• University and INFN Catania

12
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. Ive 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

13
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