140 likes | 297 Views
Optical design of the LSS. SpecificationsWavelength coverageFUV 102 ~ 170 nmNUV 165 ~ 320 nmSpectral resolving power 1500 ~ 2500Slit width 1''Slit length 75''Spatial resolution ~1''Maximum throughput and reliability (minimum number of reflecting surfaces, no movable elements)Optical
E N D
1. LSS Detectors Qian Song
NAOC
Sq@bao.ac.cn
2. 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.
3. WSO detector workshop, Leicester 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)
4. WSO detector workshop, Leicester Detector: MCP + Anode photon counter Photocathode:
CsI, KI, CsBr, Kbr (FUV)
CsTe, Cs2Te, RbTe2 (NUV)
New AlGaN: DQE = 50% (100 360nm)
Anode:
WSA, vernier
5. WSO detector workshop, Leicester 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
6. WSO detector workshop, Leicester 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.
7. WSO detector workshop, Leicester 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
8. WSO detector workshop, Leicester 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
Housekeeping 300-500
DC-DC converters (@80%) 560-860
Total 3360-5160 mW
9. WSO detector workshop, Leicester A Development Outline Plan by SRC
10. WSO detector workshop, Leicester 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.
11. WSO detector workshop, Leicester 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.
12. WSO detector workshop, Leicester 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.
13. WSO detector workshop, Leicester A WSA photon counter by XIOPM
14. WSO detector workshop, Leicester Thanks