Collective Thomson scattering in tokamaks having energetic ions

R. C. Myer; P. P. Woskov; J. S. Machuzak; D. J. Sigmar; D. R. Cohn; N. L. Bretz; P. C. Efthimion; P. L. Colestock

Collective Thomson scattering in tokamaks having energetic ions

R. C. Myer, P. P. Woskov, J. S. Machuzak, D. J. Sigmar, D. R. Cohn, N. L. Bretz, P. C. Efthimion, P. L. Colestock

Research output: Contribution to conference › Paper › peer-review

Abstract

Collective Thomson scattering (CTS) of electromagnetic waves occurs when the effective wavelength of the incoming radiation is larger than the Debye length. Under these circumstances, the electrons surrounding a fast ion radiate collectively to produce a wave that is Doppler-shifted by the ion velocity. Recent theoretical analysis suggests that an energetic (200-800 keV) He³ minority can be produced in TFTR by ion cyclotron heating (ICH). Since the ICH-generated distribution is non-Maxwellian, the authors have generalized the theoretical analysis of CTS to allow for particle distributions which can be represented by various orthogonal polynomial expansions. They have evaluated the efficacy of CTS in detecting a fast He³ component and determined the sensitivity of the diagnostic to the details of the ion distribution. In particular, the effectiveness of a planned 56-GHz gyrotron CTS diagnostic for TFTR has been evaluated. Detailed spectrum calculations will allow refinement of the scattering geometry, spectrum analysis electronics, required bandwidth, and resolution, and allow estimates of the expected signal-to-noise ratio.

Original language	English (US)
Pages	139-140
Number of pages	2
State	Published - 1989
Externally published	Yes
Event	IEEE International Conference on Plasma Science 1989 - Buffalo, NY, USA Duration: May 22 1989 → May 24 1989

Other

Other	IEEE International Conference on Plasma Science 1989
City	Buffalo, NY, USA
Period	5/22/89 → 5/24/89

All Science Journal Classification (ASJC) codes

General Engineering

Cite this

@conference{ebffc36c93a74ebaa0dfc5f8c5d08475,

title = "Collective Thomson scattering in tokamaks having energetic ions",

abstract = "Collective Thomson scattering (CTS) of electromagnetic waves occurs when the effective wavelength of the incoming radiation is larger than the Debye length. Under these circumstances, the electrons surrounding a fast ion radiate collectively to produce a wave that is Doppler-shifted by the ion velocity. Recent theoretical analysis suggests that an energetic (200-800 keV) He3 minority can be produced in TFTR by ion cyclotron heating (ICH). Since the ICH-generated distribution is non-Maxwellian, the authors have generalized the theoretical analysis of CTS to allow for particle distributions which can be represented by various orthogonal polynomial expansions. They have evaluated the efficacy of CTS in detecting a fast He3 component and determined the sensitivity of the diagnostic to the details of the ion distribution. In particular, the effectiveness of a planned 56-GHz gyrotron CTS diagnostic for TFTR has been evaluated. Detailed spectrum calculations will allow refinement of the scattering geometry, spectrum analysis electronics, required bandwidth, and resolution, and allow estimates of the expected signal-to-noise ratio.",

author = "Myer, \{R. C.\} and Woskov, \{P. P.\} and Machuzak, \{J. S.\} and Sigmar, \{D. J.\} and Cohn, \{D. R.\} and Bretz, \{N. L.\} and Efthimion, \{P. C.\} and Colestock, \{P. L.\}",

year = "1989",

language = "English (US)",

pages = "139--140",

note = "IEEE International Conference on Plasma Science 1989 ; Conference date: 22-05-1989 Through 24-05-1989",

}

TY - CONF

T1 - Collective Thomson scattering in tokamaks having energetic ions

AU - Myer, R. C.

AU - Woskov, P. P.

AU - Machuzak, J. S.

AU - Sigmar, D. J.

AU - Cohn, D. R.

AU - Bretz, N. L.

AU - Efthimion, P. C.

AU - Colestock, P. L.

PY - 1989

Y1 - 1989

N2 - Collective Thomson scattering (CTS) of electromagnetic waves occurs when the effective wavelength of the incoming radiation is larger than the Debye length. Under these circumstances, the electrons surrounding a fast ion radiate collectively to produce a wave that is Doppler-shifted by the ion velocity. Recent theoretical analysis suggests that an energetic (200-800 keV) He3 minority can be produced in TFTR by ion cyclotron heating (ICH). Since the ICH-generated distribution is non-Maxwellian, the authors have generalized the theoretical analysis of CTS to allow for particle distributions which can be represented by various orthogonal polynomial expansions. They have evaluated the efficacy of CTS in detecting a fast He3 component and determined the sensitivity of the diagnostic to the details of the ion distribution. In particular, the effectiveness of a planned 56-GHz gyrotron CTS diagnostic for TFTR has been evaluated. Detailed spectrum calculations will allow refinement of the scattering geometry, spectrum analysis electronics, required bandwidth, and resolution, and allow estimates of the expected signal-to-noise ratio.

AB - Collective Thomson scattering (CTS) of electromagnetic waves occurs when the effective wavelength of the incoming radiation is larger than the Debye length. Under these circumstances, the electrons surrounding a fast ion radiate collectively to produce a wave that is Doppler-shifted by the ion velocity. Recent theoretical analysis suggests that an energetic (200-800 keV) He3 minority can be produced in TFTR by ion cyclotron heating (ICH). Since the ICH-generated distribution is non-Maxwellian, the authors have generalized the theoretical analysis of CTS to allow for particle distributions which can be represented by various orthogonal polynomial expansions. They have evaluated the efficacy of CTS in detecting a fast He3 component and determined the sensitivity of the diagnostic to the details of the ion distribution. In particular, the effectiveness of a planned 56-GHz gyrotron CTS diagnostic for TFTR has been evaluated. Detailed spectrum calculations will allow refinement of the scattering geometry, spectrum analysis electronics, required bandwidth, and resolution, and allow estimates of the expected signal-to-noise ratio.

UR - https://www.scopus.com/pages/publications/0024886311

UR - https://www.scopus.com/inward/citedby.url?scp=0024886311&partnerID=8YFLogxK

M3 - Paper

AN - SCOPUS:0024886311

SP - 139

EP - 140

T2 - IEEE International Conference on Plasma Science 1989

Y2 - 22 May 1989 through 24 May 1989

ER -

Collective Thomson scattering in tokamaks having energetic ions

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