Accession Number:

ADA275054

Title:

Transient Internal Probe

Descriptive Note:

Final technical rept. 15 Sep 1990-15 Oct 1993

Corporate Author:

WASHINGTON UNIV SEATTLE AEROSPACE AND ENERGETICS RESEARCH PROGRAM

Report Date:

1993-12-15

Pagination or Media Count:

59.0

Abstract:

The Transient Internal Probe TIP diagnostic is a novel method for probing the interior of hot magnetic fusion plasmas that are inaccessible with ordinary stationary probes. A small probe of magneto-optic Verdet material is fired through a plasma at speeds of several kmsec, illuminated by a laser beam. The beams polarization is rotated in the probe by the local magnetic field and retroreflection back to a polarimetry detector allows determination of the B- field profile across the diameter of a plasma at a spatial resolution of better than 1-cm and an absolute B-field resolution of a few tens of Gauss. The principal components of a TIP diagnostic system were developed and tested. A two-stage light gas gun was constructed that accelerates 30-caliber projectiles to 3 kmsec, and methods were examined for stripping a lexan sabot from a probe prior to entry into a plasma. Probes of CdMnTe and FR-5 Verdet glass were fabricated, and a polarimetry system was constructed for resolving polarization to within 0.25 deg. The diagnostic was validated by measuring a static B-field with a moving dropped TIP probe, and finding agreement with Hall-probe measurements to within experimental accuracy 40 gauss

Subject Categories:

  • Electricity and Magnetism
  • Optics
  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE