LSS Detectors

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LSS Detectors

• Qian Song
• NAOC
• Sq_at_bao.ac.cn

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Optical design of the LSS

• Specifications
• Wavelength coverage
• FUV 102 170 nm
• NUV 165 320 nm
• Spectral resolving power
• 1500 2500
• Slit width 1''
• Slit length 75''
• Spatial resolution 1''
• Maximum throughput and reliability (minimum
  number of reflecting surfaces, no movable
  elements)
• Optical layout for FUV is based on Rowland
  circle, only one optical element between the
  entrance slit and the detector. The grating
  serves as both the light dispersing and imaging
  element.

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Requirements of detectors

• Pixel size 0.04mm in spectrum direction
• 0.04mm in imaging direction
• Format
• FUV 2390150 pixels
• Area 96mm6mm
• NUV 2650150 pixels
• Area 106mm6mm
• Image is curved when no rectifier mirror is
  applied (only a grating)

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Detector MCP Anode photon counter

• Photocathode
• CsI, KI, CsBr, Kbr (FUV)
• CsTe, Cs2Te, RbTe2 (NUV)
• New AlGaN DQE 50 (100 360nm)
• Anode
• WSA, vernier

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Dates of delivery of scientific instruments
modelsrequired by Lavochkin assuming a 2010
launch date

• Full-size mass model
• 05.2008
• Thermal equivalent
• 01.2009
• Engineering model
• 01.2009
• Flight model
• 05.2009

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Schedule Proposed to CNSA

• Phase A/B1 (technical feasibility and baseline)
• 2007.11
• Now targeting at 2008.03
• Validation model
• 2007.11-2009.06
• Flight model
• 2009.07-2010.10
• Launch
• Target at early 2012.
• A 2012 date has been formally requested by CNSA
  to Roscomos in June 2007. Roscosmos is
  evaluating.

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LSS Detector Deliverables Schedule requirements

• Detector dimension, mass, thermal properties,
  structural and thermal design should provided
  before 2008.11
• To allow 2 months to meet thermal model delivery
  date of LSS to Lavochkin (2009.01)
• Detector functionality and performance validated
  no later than 2009.06
• So that LSS design can be validated before Flight
  Model Phase
• Detector flight model no later than 2010.04
• To give 6 months of AIV time to LSS, and 12
  months of AIV time to WSO
• All dates are TBC

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A Development Outline Plan by SRC

• Typical Detector and Electronics resource
  requirements
• Dimensions (mm) length x width x height
• Assume typical intermediate active detector
  size 115 x 15
• Detector stack active dimensions 15mm 130 x
  30 x 25
• Vacuum enclosure detector 30, 30, 15mm
  (l,w,h) 160 x 60 x 40
• Vacuum door footprint 160 x 60(requires
  accommodation after opening)
• Ion pump (below detector?) TBD
• Mass grams
• Electronics 300-400
• Electronics box 400-500
• Detector 200-300
• Vacuum enclosure (s/s) inc. door and
  mechanism 600-800
• Ion pump 400-500
• Total 1900-2500 g
• Power mW
• Front end electronics 400-600
• Digital electronics 600-900
• Data communications 1200-1800
• High voltage PSU 300-500

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A Development Outline Plan by SRC
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Model policy usual in China

• Proto model (functional model) has all the
  functions, mass, size, mechanical, thermal almost
  settled, the whole design is almost the final
• Qualification model all the qualification tests
  and evaluations done.
• Flight model rebuild from qualification model
  into space use. Adequate tests.

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A good news

• The first batch of funding is expected to be
  arriving in 1 or 2 months.
• The funding is to support the LSS proto model
  development. The required schedule is far behind
  WSO required schedule.

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New comer XIOPM

• The Xian Institute of Optics and Precision
  Mechanism has jointed the LSS team and they may
  provide some design and manufacture support in
  the LSS detector development, especially the
  manpower. This may help to speed up the going.

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A WSA photon counter by XIOPM
original
corrected
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Thanks