Status Report on Bonding at
Catania
Salvatore Costa
University and INFN – Catania
Salvatore Costa - Catania
CMS Week - Bonding WG
03 Dec 2002
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).
Salvatore Costa - Catania
CMS Week - Bonding WG
03 Dec 2002
2
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.
Salvatore Costa - Catania
CMS Week - Bonding WG
03 Dec 2002
3
The Bad Bias Bonds
Salvatore Costa - Catania
CMS Week - Bonding WG
03 Dec 2002
4
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.
Salvatore Costa - Catania
CMS Week - Bonding WG
03 Dec 2002
5
Test Results before Bonding
• Noise (by ARC)
Salvatore Costa - Catania
• Calibration (by ARC)
CMS Week - Bonding WG
03 Dec 2002
6
Test Results after Bonding
(by CMS-like)
Salvatore Costa - Catania
CMS Week - Bonding WG
03 Dec 2002
7
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)
Salvatore Costa - Catania
CMS Week - Bonding WG
03 Dec 2002
8
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
Salvatore Costa - Catania
CMS Week - Bonding WG
03 Dec 2002
9
…break…
Salvatore Costa - Catania
CMS Week - Bonding WG
03 Dec 2002
DataBase Interface Update
Salvatore Costa
University and INFN – Catania
Salvatore Costa - Catania
CMS Week - Bonding WG
03 Dec 2002
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
Salvatore Costa - Catania
CMS Week - Bonding WG
03 Dec 2002
12
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
Salvatore Costa - Catania
CMS Week - Bonding WG
03 Dec 2002
13