1 / 14

Beyond 6dF (what more can we do for you?)

Beyond 6dF (what more can we do for you?). Anna Moore Roger Haynes Will Saunders + BJB. ECHIDNA. Counterweight. Fibre Positioner for Subaru/FMOS Piezo ball-spine 400 fibres 0.5deg diam. 150mm  Pick-and-place 0.9-1.8 m m Feed FMOS spectrograph. Steel Ball. Magnets. Spine.

damon
Download Presentation

Beyond 6dF (what more can we do for you?)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Beyond 6dF(what more can we do for you?) Anna Moore Roger Haynes Will Saunders + BJB

  2. ECHIDNA Counterweight Fibre Positioner for Subaru/FMOS • Piezo ball-spine • 400 fibres • 0.5deg diam. • 150mm  Pick-and-place • 0.9-1.8mm • Feed FMOS spectrograph Steel Ball Magnets Spine Echidna Ball-Spine

  3. Moduleassembly Top bridge Fibre cover Middle bridge Fibre spines and piezo actuators Module PCB Module base

  4. Echidna complete design Single module

  5. 30 30 20 20 10 10 Y (mm) 0 0 -10 -10 -20 -20 -30 -30 -30 -20 -10 0 10 20 30 X (mm) ECHIDNA Example of fibre allocation to randomly scattered targets 7mm spine deviation  90% success rate for random targets

  6. Applications for Echinda Gemini wide-field MOS (GWiMOS) • 1.5deg2 at prime focus • Corrector design exists (400kg) • 0.5arcsec images (1” fibres) • 1.4m corrector • 4000 fibres • Echidna fibre positioner • Fibre-spacing compatible with Subaru • 10 more fibres, 10 larger area

  7. Gemini wide-field • US$20M project • Initial design already begun (NOAO/AAO) • Opportunity to use AAO funds (A$2.5M) • Committed over 2002-05 as part of successful bid to Aus. Govt to increase Gemini share • Build prototype to address ‘high-risk’ areas • addressing >1000 fibres • patrolling field/reconfiguring times Build prototype for use on UK Schmidt

  8. ECHIDNA Prototype Concept Positioner • 2250 spines (15 arcmin patrol area) • Slight lower packing than Echidna (s’graph limited) • 60mm diameter (4 arcsec) • <10% vignetting over full 6o f.o.v. • Spine Tip Imager: ‘single shot’ for full field • 5min reconfiguration time SCHM

  9. Spectrograph Concept • Based on KOSMOS concept • Single-beam Schmidt-Schmidt spectrograph • Collimator f/2.25 • Camera f/1.3 • VPH grating: R=10000 • 2 x 2k x 4k CCD • 3 slits (750 fibres each) • 1st order 845-870nm (egrat=0.9) • 2nd order 422-435nm (egrat=0.8)

  10. Schmechidna • Total cost A$4M • Spectrograph: A$1.5M • Positioner: A$2.5M • Purpose designed for stellar work • IAB=15.5 R=104 S/N=30 in 1200s (S/N  for 2nd order) • 30 mins/field (inc. overheads) • 60% clear • 2000 objects/field (not limited by stellar density) 22000 objects per night (average)

  11. Options Option A • No upgrade to existing system Option B • 6dF full upgrade: • new field plates + new spectrograph Option C • Schmechinda

  12. Cost/benefit analysis DIVA survey (accessible from Australia): done in ~3yr *Fields/clear night: 5 (A), 8 (B), 18 (C) Ids/field: 100(A), 135(B), 2000(C) Fraction clear: 60% Resolution: 4000 (A,B) 10000(C)

  13. Futher Issues • Schmechidna: medium technical risk • Echidna spine module already working • patrol camera innovative • AAO ‘in kind’ contribution: $2.5M • only $1.5M outstanding instrumentation costs • Room to increase S/N or mag. limit • 107 stars in 5 years (S/N  50 or Ilim 16)

  14. Further issues • Survey using Schmechidna start in 2005/6? • Minimum of 107 stars by 2007  2010 • depending on survey parameters • N. hemisphere: Kisochidna/KOSMOS?? • Double cost • Double number of objects • Cover whole sky Schmechidna All New Stellar Survey for Orbits, Uelocities, and Chemical Indices

More Related