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Seismometer Development for the 1TeV Linear Collider

Seismometer Development for the 1TeV Linear Collider. Josef Frisch, SLAC. The 1TeV Linear Collider. 500 GeV electrons and positrons Collide at Interaction Point Want small beam spots to maximize number of interactions. Spot sizes ~ 1 nanometer.

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Seismometer Development for the 1TeV Linear Collider

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  1. Seismometer Development for the 1TeV Linear Collider Josef Frisch, SLAC

  2. The 1TeV Linear Collider 500 GeV electrons and positrons Collide at Interaction Point Want small beam spots to maximize number of interactions. Spot sizes ~ 1 nanometer. Final focus magnet relative positions must be stable to ~1nm

  3. Detector – Magnets supported in ~1 Tesla field

  4. Beam-Beam interaction provides low noise measurement at beam rate of 120 Hz. High gain below a few Hz. Need stabilization above 1 Hz. One option is to use Seismometers and feedback

  5. Seismometer Requirements • Integrated noise above 1Hz, <1nm. • (better preferred). • Flat response to ~50Hz. • Can use compound sensor with piezo-sensor if needed • Relatively compact size: ~10x10x20cm • Operation in strong magnetic field

  6. Test sensor parameters • Operation Feedback Seismometer • Test mass 40 grams • Suspension frequency 1.5Hz • Mechanical Q >100 • Theoretical thermal mechanical noise <1.5×10-10M/s2/Hz1/2. • Capacitor Sensor gap ~300 microns • Theoretical electronic noise < thermal noise • Vacuum <few microns

  7. Results to date • Tests done in noisy lab – insufficient actuator strength to close feedback above a few Hz. (Would be ok in real application) • Noise (from correlation with STS-2) <5nm/s2/sqrt(Hz) at 1Hz. • 1/f noise corner ~1Hz. • Meets our requirements – but would like better.

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