### Session VP1: Poster Session VIII: Spher. Torus and Exploratory Conf. Concepts; RF Heating and Diag; Magnetic Reconnection; Plasma Sim: Kinetic Codes; Plasma Tech.

2:00 PM–2:00 PM, Thursday, November 2, 2006
Philadelphia Marriott Downtown Room: Franklin Hall AB, 2:00pm-5:00pm

Abstract ID: BAPS.2006.DPP.VP1.66

### Abstract: VP1.00066 : Progress on the motional Stark effect with laser-induced fluoresence diagnostic

Preview Abstract MathJax On | Off   Abstract

#### Authors:

Elizabeth Foley
Fred Levinton
(Nova Photonics, Inc.)

The motional Stark effect with laser-induced fluorescence (MSE-LIF) diagnostic is under development to extend the MSE magnetic pitch angle diagnostic to lower fields ( $<$ 0.5 T) and enable measurement of magnetic field magnitude as well as direction. The technique involves injecting a low energy-spread neutral hydrogen beam (30 kV, 30 mA) into plasma, and using a collinear laser to excite transitions from the n=2 to n=3 atomic states in the beam atoms. The subsequent fluorescence from the same transition (Balmer-alpha, near 650 nm for the Doppler-shifted beam) is observed, and its splitting and polarization due to the E = v $\times$ B electric field in the beam frame is used to determine the background magnetic field magnitude and direction. This poster will present recent results from MSE-LIF development. A new plasma testbed for MSE-LIF, a spiral antenna helicon source, has been built.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.DPP.VP1.66