Electrical PP1

1
Electrical PP1

• Basic features
• Electrical schematic
• Mechanical layout
• Prototyping
• Tests before production
• QC

V. Cindro, Jožef Stefan Institute, Ljubljana,
Slovenia
DAQ, DCS, Power Supply and
Cables Review CERN, March 9 2004
2

• Basic features
• Accept Low Mass Tape on the module side and type
  II cable on the power supply side.
• It provides pads for soldering of the low mass
  tapes to the printed circuit.
• Two connectors are used for one type II cable to
  minimize the space requirement
• It provides filtering of noise on the electrical
  lines
• Radiation hardness
• CO2 environment
• Forward and barrel have different mechanical
  constraints.
• 2.5 mm rule (IPC spec) for 500 V on opened areas
  obeyed (pins on connectors will be pulled out)

V. Cindro, Jožef Stefan Institute, Ljubljana,
Slovenia
DAQ, DCS, Power Supply and
Cables Review CERN, March 9 2004
3
Barrel schematic

• control lines are AC coupled to the shield
• Vcc , Vdd and HV lines are AC coupled to their
  return lines
• DGND is DC connected to the shield
• AGND and HVGND are AC connected to the shield
• ILEDa and ILEDb lines are shorted

4
Forward schematic

• Same as PPB1 except
• DGND is AC connected to the shield
• ILEDb line on module side and Temp2 line on PS
  side are treated as a spare line

V. Cindro, Jožef Stefan Institute, Ljubljana,
Slovenia
DAQ, DCS, Power Supply and
Cables Review CERN, March 9 2004
5
Barrel PPB1 has 8 conductor layers and accepts 6
modules
V. Cindro, Jožef Stefan Institute, Ljubljana,
Slovenia
DAQ, DCS, Power Supply and
Cables Review CERN, March 9 2004
6
Forward PPF1 has 4 conductor layers and has 2
and 3 module versions. On discs 1- 8
V. Cindro, Jožef Stefan Institute, Ljubljana,
Slovenia
DAQ, DCS, Power Supply and
Cables Review CERN, March 9 2004
7
Forward PPF1 on disc 9 There should be a drawing
with just two modules
V. Cindro, Jožef Stefan Institute, Ljubljana,
Slovenia
DAQ, DCS, Power Supply and
Cables Review CERN, March 9 2004
8

• Prototyping
• Prototypes of PPB1 have been used in the system
  test before production, noise performance of
  system was measured
• Prototype harnesses have been assembled and
  tested with PPB1
• Electrical prototypes of PPF1 have been used in
  the system test
• Thermode soldering of tapes has been developed at
  RAL on protypes, procedure improved with hot
  plate soldering at Taiwan during production ?
  less cold solder joints

V. Cindro, Jožef Stefan Institute, Ljubljana,
Slovenia
DAQ, DCS, Power Supply and
Cables Review CERN, March 9 2004
9

• Tests before production
• Radiation hardness was checked up to 10 MRad
  (resistances, capacitances measured) no change
  of C and leakage currents was measured
• Accelerated aging at 100o C in CO2 was checked
  
• Duration of aging 72 hours (1st step) 48 hours
  (2nd step)
• Acceleration factor (20o ? 100o) 110 (Ea
  0.5 eV) , 8000 (Ea 1.0 eV)
• Interline resistance, HV leakage current and line
  solder joint resistance were measured before
  and after aging
• Bias 500 V at HV line during aging

V. Cindro, Jožef Stefan Institute, Ljubljana,
Slovenia
DAQ, DCS, Power Supply and
Cables Review CERN, March 9 2004
10
V. Cindro, Jožef Stefan Institute, Ljubljana,
Slovenia
DAQ, DCS, Power Supply and
Cables Review CERN, March 9 2004
11
QC during production
After the assembly with components, the boards
should be tested by the producer. Following tests
shall be performed 1. Connectivity and
Capacitance test a.) Connection from the
connector to the capacitance required b.)
Resistance up to 2 MO Between any two lines or
ground - rejected c.) Capacitance value agrees
within 20 percent with nominal 2. Trace
resistance test measurement of the resistance
between the connector and LMT solder pad with 20
O range and 10mO resolution. Resistance of each
line should agree within 30 percent with the
average value (average measured for that
line within the production batch). 3.High voltage
test 500 V test for 10 s on the HV bias line.
Leakage current between HV bias line and HV
return line and between HV bias line and Ground
shall be less than 100 nA.
V. Cindro, Jožef Stefan Institute, Ljubljana,
Slovenia
DAQ, DCS, Power Supply and
Cables Review CERN, March 9 2004
12
Production

• 440 (all) PPB1 have been already produced, B3
  harnesses already mounted
• First batch of 620 PPF12 and 450 PPF13 in
  production, shipping to Taiwan within two weeks

V. Cindro, Jožef Stefan Institute, Ljubljana,
Slovenia
DAQ, DCS, Power Supply and
Cables Review CERN, March 9 2004
13

• Related documents
• Explanation of LMT harness routing from PPF0 to
  PPF1 ATL-IS-EN-0026
• PPB1 For Fibres and Low Mass Tapes
  ATL-IS-ES-0057.
• SCT End-cap LM tape mapping table - module to
  PPF1 ATL-IS-EN-0024
• End-cap Module and Services Position Numbering
  Scheme ATL-IS-EN-0021
• Spreadsheet of Low Mass Tape Length from PPF0 to
  PPF1 on SCT end-cap ATLAS-IS-ES-0095
• Technical specification for the manufacture and
  supply of low-mass tapes for the ATLAS SCT
  detector ATL-IS-CS-0014
• SCT Low-mass Power Tapes ATL-IS-AT-0013
• PPF1, LMT and PP0 assemblies for the forward part
  of the SCT (in preparation, draft on
  http//wwwf9.ijs.si/7Ecindro/cables/forward/ppf1a
  ssembliesEDMS.doc

V. Cindro, Jožef Stefan Institute, Ljubljana,
Slovenia
DAQ, DCS, Power Supply and
Cables Review CERN, March 9 2004