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Published byJens Weiner Modified over 5 years ago
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Seismometer Development for the 1TeV Linear Collider
Josef Frisch, SLAC
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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
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Detector – Magnets supported in ~1 Tesla field
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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
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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
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Test sensor parameters
Operation Feedback Seismometer Test mass 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
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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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