Actions for Midplane Faraday Rotation [electronic resource] : A densitometer for BPX

Email RIS file
Bookmark
Report an Issue

Midplane Faraday Rotation [electronic resource] : A densitometer for BPX

Published
Washington, D.C. : United States. Dept. of Energy, 1992.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
22 pages : digital, PDF file
Additional Creators
Princeton University, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online

Availability

I Want It
I Want It

Finding items...

Restrictions on Access
Free-to-read Unrestricted online access
Summary
The density in a high field, high density tokamak such as BPX can be determined by measuring the Faraday rotation of a 10.6 μm laser directed tangent to the toroidal field. If there is a horizontal array of such beams, then n{sub e}(R) can be readily obtained with a simple Abel version about the center line of the tokamak. For BPX operated at full field and density, the rotation angle would be quite large -- about 75° per pass. A layout in which a single laser beam is fanned out in the horizontal midplane of the tokamak, with a set of retroreflectors on the far side of the vacuum vessel, would provide good spatial resolution, depending only upon the number of reflectors. With this proposed layout, only one window would be needed. Because the rotation angle is never more than 1 ``fringe,`` the data is always good, and it is also a continuous measurement in time. Faraday rotation is dependent only upon the plasma itself, and thus is not sensitive to vibration of the optical components. Simulations of the expected results show that BPX would be well served even at low densities by a Midplane Faraday Rotation densitometer of ∼64 channels. Both TFTR and PBX-M would be suitable test beds for the BPX system.
Report Numbers
E 1.99:pppl--2829
pppl--2829
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
02/01/1992.
"pppl--2829"
"DE92010006"
Mansfield, D.K.; Jobes, F.C.
Type of Report and Period Covered Note
Topical; 02/01/1992 - 02/01/1992
Funding Information
AC02-76CH03073
View MARC record | catkey: 14745095