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Threats to the GIMM and Use of XAPPER for Testing

Threats to the GIMM and Use of XAPPER for Testing. Jeff Latkowski Ryan Abbott February 15, 2006. The GIMM run shows that while the temperature response may seem reasonable, stresses will could be significant.

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Threats to the GIMM and Use of XAPPER for Testing

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  1. Threats to the GIMM and Use of XAPPER for Testing Jeff Latkowski Ryan Abbott February 15, 2006

  2. The GIMM run shows that while the temperature response may seem reasonable, stresses will could be significant • The laser pulse will generate the greatest temperature spike with a magnitude of ~ 30 degrees Laser Debris Ions Burn Ions x-rays • Compressive surface stresses could cause the optic to yield in compression and pose a fatigue or cracking threat

  3. With a fluence of only 22.4 mJ/cm2, XAPPER canreplicate the expected peak temperatures and stresses • Ironically, XAPPER operation will produce significantly longer time at temperature and stress than the actual IFE case

  4. We are completing ray tracing to designa new ellipsoidal optic for use on XAPPER • New optic  ~0.04 J/cm2 • With ~10 mJ per pulse, could have spot radius of 2-3 mm instead of usual 500 mm • Exposure will still be ~normal to surface (e.g., no grazing angle) • Proposed schedule: • final design by end of February • start mandrel in March • first new optic in June Current optic  ~1 J/cm2

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