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High resolution magnetoresistive position sensor for the JWST

Explore the advanced magnetoresistive sensor used in the James Webb Space Telescope to achieve precise positioning for scientific research and instrument operation.

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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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