BibSonomy :: publication ::

tag user group author concept BibTeX key search:all search:prodrigues

The blue social bookmark and publication sharing system.

entry of prodrigues:

(0)

This publication has not been reviewed yet.

rating distribution

average user rating

The average rating is computed over all reviews. However, some of them may be invisible to you due to the visibility setting chosen by the reviewers.

(0.0 of 5.0 based on 0 reviews)

Magnetic field pitch angle diagnostic using the motional Stark effect invited

by: F. M. Levinton, G. M. Gammel, R. Kaita, H. W. Kugel, and D. W. Roberts

In: Review of Scientific Instruments, Vol. 61, Nr. 10AIP (October 1990) , p. 2914-2919.

Resources (URL, PDF, PS...)

URL:	http://link.aip.org/link/?RSI/61/2914/1
DOI:	10.1063/1.1141776

The Stark effect has been employed in a novel technique for obtaining the pitch angle profile and $qr$ using polarimetry measurements of the Doppler shifted $H$ emission from a hydrogen diagnostic neutral beam. As a neutral beam propagates through a plasma, collisions of the beam particles with the background ions and electrons will excite beam atoms, leading to emission of radiation. The motional Stark effect, which arises from the electric field induced in the atom's rest frame due to the beam motion across the magnetic field $E=V_\rm beam \times B$, causes a wavelength splitting of several angstroms and polarization of the emitted radiation. The $m=\pm 1$ transitions, or components, from the beam fluorescence are linearly polarized parallel to the direction of the local magnetic field when viewed transverse to the fields. Since the hydrogen beam provides good spatial localization and penetration, the pitch angle can be obtained anywhere in the plasma. A photoelastic modulator PEM is used to modulate the linearly polarized light. Depending on the orientation of the PEM, it can measure the sine or cosine of the angle of polarization. Two PEM's are used to measure both components simultaneously. Results of $qr$ for both Ohmic and NBI heated discharges have been obtained in the Princeton Beta Experiment PBX-M tokamak, with an uncertainty of $\sim 6$\% for $q0$.

Description

A somewhat more detailed description of the MSE implementation on PBX-M.

BibTeX record

@article{levinton.1990,
  abstract = {The Stark effect has been employed in a novel technique for obtaining the pitch angle profile and $q(r)$ using polarimetry measurements of the Doppler shifted $H$ emission from a hydrogen diagnostic neutral beam. As a neutral beam propagates through a plasma, collisions of the beam particles with the background ions and electrons will excite beam atoms, leading to emission of radiation. The motional Stark effect, which arises from the electric field induced in the atom's rest frame due to the beam motion across the magnetic field ($E=V_{\rm beam} \times B$), causes a wavelength splitting of several angstroms and polarization of the emitted radiation. The $m=\pm 1$ transitions, or  components, from the beam fluorescence are linearly polarized parallel to the direction of the local magnetic field when viewed transverse to the fields. Since the hydrogen beam provides good spatial localization and penetration, the pitch angle can be obtained anywhere in the plasma. A photoelastic modulator (PEM) is used to modulate the linearly polarized light. Depending on the orientation of the PEM, it can measure the sine or cosine of the angle of polarization. Two PEM's are used to measure both components simultaneously. Results of $q(r)$ for both Ohmic and NBI heated discharges have been obtained in the Princeton Beta Experiment (PBX-M) tokamak, with an uncertainty of $\sim 6$\% for $q(0)$.},
  added-at = {2009-07-03T12:18:26.000+0200},
  author = {Levinton, F. M. and Gammel, G. M. and Kaita, R. and Kugel, H. W. and Roberts, D. W.},
  biburl = {http://www.bibsonomy.org/bibtex/2a2a3ca62c009f1bf3f5bbd711a01039c/prodrigues},
  description = {A somewhat more detailed description of the MSE implementation on PBX-M.},
  doi = {10.1063/1.1141776},
  interhash = {5aa5b0030890d882ff987db51630f8b9},
  intrahash = {a2a3ca62c009f1bf3f5bbd711a01039c},
  journal = {Review of Scientific Instruments},
  keywords = {MSE diagnostics tokamak},
  month = {October},
  note = {Eighth topical conference on hightemperature plasma diagnostics},
  number = 10,
  numpages = {6},
  pages = {2914-2919},
  publisher = {AIP},
  timestamp = {2009-07-03T12:18:26.000+0200},
  title = {Magnetic field pitch angle diagnostic using the motional Stark effect (invited)},
  url = {http://link.aip.org/link/?RSI/61/2914/1},
  volume = 61,
  year = 1990
}

Endnote record

%0 Journal Article
%1 levinton.1990
%A Levinton, F. M.
%A Gammel, G. M.
%A Kaita, R.
%A Kugel, H. W.
%A Roberts, D. W.
%D 1990
%I AIP
%J Review of Scientific Instruments
%K 
%N 10
%P 2914-2919
%T Magnetic field pitch angle diagnostic using the motional Stark effect (invited)
%R 10.1063/1.1141776
%U http://link.aip.org/link/?RSI/61/2914/1
%V 61
%X The Stark effect has been employed in a novel technique for obtaining the pitch angle profile and $q(r)$ using polarimetry measurements of the Doppler shifted $H$ emission from a hydrogen diagnostic neutral beam. As a neutral beam propagates through a plasma, collisions of the beam particles with the background ions and electrons will excite beam atoms, leading to emission of radiation. The motional Stark effect, which arises from the electric field induced in the atom's rest frame due to the beam motion across the magnetic field ($E=V_{\rm beam} \times B$), causes a wavelength splitting of several angstroms and polarization of the emitted radiation. The $m=\pm 1$ transitions, or  components, from the beam fluorescence are linearly polarized parallel to the direction of the local magnetic field when viewed transverse to the fields. Since the hydrogen beam provides good spatial localization and penetration, the pitch angle can be obtained anywhere in the plasma. A photoelastic modulator (PEM) is used to modulate the linearly polarized light. Depending on the orientation of the PEM, it can measure the sine or cosine of the angle of polarization. Two PEM's are used to measure both components simultaneously. Results of $q(r)$ for both Ohmic and NBI heated discharges have been obtained in the Princeton Beta Experiment (PBX-M) tokamak, with an uncertainty of $\sim 6$\% for $q(0)$.