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NIRSpec IFU. Eric Prieto Final Presentation Definition Phase May, 11th – ESTEC. Introduction. Requirements overview Implementation Performance Budgets Compliance Status. 4. 1. 3. 2. Slicer Principle. How to rearrange 2D field to enter spectrograph slit:.

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nirspec ifu

NIRSpec IFU

Eric Prieto

Final Presentation Definition Phase

May, 11th – ESTEC

introduction
Introduction
  • Requirements overview
  • Implementation
  • Performance
  • Budgets
  • Compliance
  • Status

Nirspec Definition phase Final Presentation

ESTEC

slicer principle

4

1

3

2

Slicer Principle

How to rearrange 2D field to enter spectrograph slit:

  • Field divided by slicing mirrors in subfields
  • Telescope pupil on the pupil mirrors
  • Aligned pupil mirrors
  • Subfields imaged along an entrance slit

Courtesy: JR Allington-Smith

Nirspec Definition phase Final Presentation

ESTEC

requirement overview
Requirement overview
  • FOV: 3”x3” @ 0.075” (40 slices of 40 pixels)
  • R~3000 (Slit mode gratings)
  • Optical throughput > 50%
  • Mass < 1kg

Nirspec Definition phase Final Presentation

ESTEC

implementation
Implementation
  • No dedicated selection mechanism
  • A 3mm aperture in the MSA frame
  • MSA magnet hides the IFU aperture during MOS operation

Nirspec Definition phase Final Presentation

ESTEC

implementation1
Implementation

Relay optics

Slicer Stack

(40 slices)

Slit mirror Line

(40 elements)

Pupil mirror Line

(40 elements)

IFU aperture

Nirspec Definition phase Final Presentation

ESTEC

slicer stack subassembly
Slicer stack subassembly

Nirspec Definition phase Final Presentation

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lines subassemblies
Lines subassemblies
  • Opto-mecha mount: clamps on stiff Zerodur bar
  • Titanium clamps
  • Positioning reference: thrust
  • Each individual mirrors optically bonded on the bar
  • Bonding strength: see slide 14

Nirspec Definition phase Final Presentation

ESTEC

optical performance and budget
Optical performance and budget

Relay optics

Slicer Unit

Prototype

Throughput reflectivity: > 83% (R123: with 25% of margin)

Throughput diffraction: > 90% (equivalent to R76)

Overall IFU: 75%

Overall NIRSPEC+IFU: 30% (diffraction included)

Nirspec Definition phase Final Presentation

ESTEC

mass budget
Mass Budget

Nirspec Definition phase Final Presentation

ESTEC

compliance
Compliance
  • No major issue to be compliant
  • Only vibration compliance to be demonstrated (in July 2004)
  • Compliance to optical interface
  • Compliance with allocated volume
  • To Be Finalized: Mechanical interface with structure

Nirspec Definition phase Final Presentation

ESTEC

ddv plans
DDV plans

Nirspec Definition phase Final Presentation

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status prototype performances

Thermometers

Thermal straps

Status: Prototype performances

Nirspec Definition phase Final Presentation

ESTEC

status optical bonding strength

Optical bonding

Lessons Learned:

Perpendicular Bonding

TO BE AVOIDED

Optical bonding

Status: Optical bonding strength
  • Bonding surface: 47mm²
  • Load increase speed: 4 N/minute
  • 3 tests @ 18N
  • Mass: 0.36g
  • Equivalent acceleration: 5000 G Factor 100 of margin

Nirspec Definition phase Final Presentation

ESTEC

conclusion maturity
Conclusion: Maturity
  • Manufacturing maturity:
      • Slicer: ok
      • Pupil/slit line: ok
      • Structure/opto-mechanical mount: ok
  • Cryo maturity:
      • Slicer: ok
      • Pupil/slit line: ok
      • Structure/opto-mechanical mount: ok
  • Vibration maturity: July 2004
  • Optical performance maturity:
      • Slicer: ok
      • Pupil/slit : ok
      • Overall system: ok (@30-40°K and RT)

Nirspec Definition phase Final Presentation

ESTEC

conclusion
Conclusion:
  • Very close to be a mature technology
  • It is an unique opportunity
  • It is very efficient (No slit losses)
  • Most of ground instruments for 2010 in the European (the World?) community have IFU capabilities in the VIS/NIR Domain:

(as GNIRS/GEMINI, KMOS/VLT, MUSE/VLT, Planet Finder/VLT, …)

NIRSpec?

Nirspec Definition phase Final Presentation

ESTEC

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