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Accelerator Seminars

Accelerator Seminar Committee:
  Chair: Joe Grames / Past Chair: Anne-Marie Valente

    Members: Carlos Hernandez- Garcia, Gianluigi Ciovati, Vasiliy Morozov and
Steve Benson

 Accelerator Seminars will be scheduled weekly on Thursdays from 11:00 a.m. - 12:00 p.m.
If you would like to schedule a seminar, please contact Joe Grames for approval.


DATE: Friday, February 19, 20115

TITLE: Fiber-Optic Based Cryogenic Temperature and High Magnetic Field Sensors

SPEAKER: Brian Geist, MicroXact, inc.

TIME: 11:00 a.m.

LOCATION: CEBAF Center, Room F113

ABSTRACT: Fiber optic sensors are continuing to see development for use in radioactive environments due to the demand for radiation hardened sensors. Pure silica fiber is used for making sensors due to its low radiation cross-section. MicroXact and JLab have developed a fiber based cryogenic temperature sensor that is sensitive enough for thermal mapping of superconducting elements such as RF cavities as part of an advanced quench detection system. The sensor is fabricated from low radiation cross-section materials and has been proposed for use in radioactive environments. Radiation hardened magnetic field sensing for facilities such as accelerators and tokomaks are also currently being developed. MicroXact in collaboration with Oak Ridge National Lab, the Nuclear Reactor Lab at Ohio State University and the Facility for Rare Isotope Beams at Michigan State University have developed a radiation hardened all-optical magnetic field sensor that can be retrofit to Hall Effect type magnetic field sensing systems resulting in prolonged sensor service life in accelerators and other applications where long maintenance intervals are desired. This Faraday Effect sensor is built from pure silica fiber and a terbium gallium garnet crystal with all optical processing performed away from the radiation environment. With these and other fiber based sensors, MicroXact is developing a broad range of radiation hardened sensors for accelerator and reactor facilities.



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