WP4 Analogue Electronics

1
WP4 Analogue Electronics Up-date on Work Plan
Progress C Castelli and D Hoyland
Document ID ALUKGLA0042aAUG03
2
Project Schedule Overview Milestone inputs from
EC2 and RAL WP3 schedule Controls prototype tests
(LASTI) Feb 05 Preliminary Design Review (PDR)
July 05 Noise prototype testing and cavity
tests June 06 to May 07 Production Readiness
Review (PRR) Nov 06 Final Design Review (FDR)
May 07 First Article Assembly Aug 07 IFO1
integration complete Dec 07 IFO 2 3
Integration complete June 08
3

• WP4 Development approach
• Early convergence on design concept for OSEMs
• Freeze interfaces after detailed electronic and
  OSEM design
• Manufacture in-house engineering model OSEM
  (possible use in controls prototype LASTI test?)
• In-house build and testing of noise prototype
  OSEMs (269) and control electronics (200)
• Selection of manufacturer for main productions
• Final design and manufacturing studies
• Place contract with industry for electronics and
  OSEMs
• Contract management, unit level testing and
  delivery

4
GANTT for WP4 OSEM and Control Electronics
Production
5
Slightly late
6

• Areas of Concern
• Major concern is that outcome of LASTI tests are
  not compatible with the delivery dates for main
  electronics
• 1 month separates end of LASTI tests and PRR
• Need 4-5 months to prepare for industrial
  manufacture i.e. select contractor, finalize
  manufacturing data and prepare for PRR
• OJEC (Official Journal for European Communities)
  rules for procurement using public sector funds
  for tenders over 160K 6 months
• Problem for main production where costs 200K
  depending on how much WA is required

7

• Overview of Progress
• Coordinated development of OSEM between Glasgow,
  Strathclyde and Birmingham 19
• Design team at Birmingham Dave Hoyland, Stuart
  Aston and Clive Speake
• Two approaches being investigated in parallel
• Imaging system
• Interferometer concept for position sensing
  (Speake)
• Vacuum compatibility, reliability and temperature
  stability of components

8
Position Sensing/imaging System (Baseline)
Birmingham exploring design concept based on BIPM
measurements Trade off studies looking at laser
diodes (cost, stability, power etc) and
photodiode characteristics (saturation
limits) Advantage in terms of laser power light
scattering
9
Interferometer readout system
O2
10

• Interferometer Readout System
• Cost of system with external optical coupling
• Not a COTS unit yet so cost is a driver ?
• Pig-tail coupling to diode (set-up alignment
  sensitivity)
• DSP fringe counting electronics (real time s/w)
• Demonstrated 5x10-13 m/?Hz at UCSD (requirement
  is gt10-11m/Hz)
• Estimates indicate that maximum sensitivity for
  imaging system only just meets the requirement

11

• Facilities at Birmingham
• Group awarded 5M infrastructure development
  fund (SRIF)
• New assembly and test facilities for space
  projects
• New electronics clean room assembly and
  mechanical manufacturing
• New design office suites
• Precision optical facilities and metrology (CMM,
  interferometers, optics benches etc in clean
  stable environments)