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High resolution magnetoresistive position sensor for the JWST

High resolution magnetoresistive position sensor for the JWST. Tobias Junginger. Contents. The JWST Scientific goals Instruments Nirspec (near infrared spectrograph) Microshutters The Grating wheel position sensor. The James Webb Space Telescope. Infrared space telescope

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High resolution magnetoresistive position sensor for the JWST

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  1. High resolution magnetoresistive position sensor for the JWST Tobias Junginger

  2. Contents • The JWST • Scientific goals • Instruments • Nirspec (near infrared spectrograph) • Microshutters • The Grating wheel position sensor

  3. The James Webb Space Telescope • Infrared space telescope • scheduled for launch in 2013 • large mirror 6.5 meters in diameter and a sunshield the size of a tennis court • Both will fold up in space • Orbit second sun-earth Langrangian point (1,5 million kilometers from earth)

  4. Scientific goals • Identify the first bright objects that formed in the early Universe • Assembly of Galaxies • The birth of stars and protoplanatary systems • study the physical and chemical properties of solar systems

  5. Instruments

  6. The Micro-shutters

  7. The GWA (Grating Wheel Assembly)

  8. The GWA Position Sensor

  9. The GWA Position Sensor Requirements • Can measure two dimensions • Ready for using at a wide temperature range down to 4K • High sensitivity in movement direction (0,3 arcsec) • Low impact on the sensitivity by small deflections in Z axis • Minimal power dissipation • No forces in movement direction • Compact size and very lightweight design (fieldplates + magnets < 10g)

  10. The GWA Position Sensor Breadboard Michelson Interferometer Mount for the fieldplates Light output to photo diode Mount for the magnets Light Input from Laser Piezoelectric positioning unit

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