Performance evaluation of the TFTR gyrotron CTS diagnostic for alpha particles

D. Y. Rhee; D. R. Cohn; J. S. Machuzak; P. Woskov; N. Bretz; R. Budny; P. C. Efthimion; H. K. Park

doi:10.1063/1.1143646

Performance evaluation of the TFTR gyrotron CTS diagnostic for alpha particles

D. Y. Rhee, D. R. Cohn, J. S. Machuzak, P. Woskov, N. Bretz, R. Budny, P. C. Efthimion, H. K. Park

Plasma Physics Lab

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

A large-angle, 60-GHz collective Thomson scattering (CTS) diagnostic system for localized measurements of DT alpha-particle velocity distribution and fraction is being implemented on TFTR. Calculations of expected CTS spectra, signal-to-noise ratio per receiver channel, and estimated error in determining the temperature and fraction of alpha particles are being carried out. The experimental spectra are simulated by adding noise to the theoretical calculation by a Monte Carlo technique. Error analysis is then performed by using a relative intensity calibrated nonlinear curve fitting code to calculate the desired plasma parameters (T_i, T_α, n _α/n_i). Simulation results indicate that expected background emission of 20 eV during Supershot in TFTR poses no problem to the experiment. Also short integration times (<10 ms) can be used to resolve the energetic ion features, thus offering a possibility for the study of temporal evolution of energetic ion velocity distribution during a single plasma shot.

Original language	English (US)
Pages (from-to)	4644-4646
Number of pages	3
Journal	Review of Scientific Instruments
Volume	63
Issue number	10
DOIs	https://doi.org/10.1063/1.1143646
State	Published - 1992

All Science Journal Classification (ASJC) codes

Instrumentation

Access to Document

10.1063/1.1143646

Cite this

@article{d333fbfa29364db7997411ef90890982,

title = "Performance evaluation of the TFTR gyrotron CTS diagnostic for alpha particles",

abstract = "A large-angle, 60-GHz collective Thomson scattering (CTS) diagnostic system for localized measurements of DT alpha-particle velocity distribution and fraction is being implemented on TFTR. Calculations of expected CTS spectra, signal-to-noise ratio per receiver channel, and estimated error in determining the temperature and fraction of alpha particles are being carried out. The experimental spectra are simulated by adding noise to the theoretical calculation by a Monte Carlo technique. Error analysis is then performed by using a relative intensity calibrated nonlinear curve fitting code to calculate the desired plasma parameters (Ti, Tα, n α/ni). Simulation results indicate that expected background emission of 20 eV during Supershot in TFTR poses no problem to the experiment. Also short integration times (<10 ms) can be used to resolve the energetic ion features, thus offering a possibility for the study of temporal evolution of energetic ion velocity distribution during a single plasma shot.",

author = "Rhee, \{D. Y.\} and Cohn, \{D. R.\} and Machuzak, \{J. S.\} and P. Woskov and N. Bretz and R. Budny and Efthimion, \{P. C.\} and Park, \{H. K.\}",

year = "1992",

doi = "10.1063/1.1143646",

language = "English (US)",

volume = "63",

pages = "4644--4646",

journal = "Review of Scientific Instruments",

issn = "0034-6748",

publisher = "American Institute of Physics",

number = "10",

}

TY - JOUR

T1 - Performance evaluation of the TFTR gyrotron CTS diagnostic for alpha particles

AU - Rhee, D. Y.

AU - Cohn, D. R.

AU - Machuzak, J. S.

AU - Woskov, P.

AU - Bretz, N.

AU - Budny, R.

AU - Efthimion, P. C.

AU - Park, H. K.

PY - 1992

Y1 - 1992

N2 - A large-angle, 60-GHz collective Thomson scattering (CTS) diagnostic system for localized measurements of DT alpha-particle velocity distribution and fraction is being implemented on TFTR. Calculations of expected CTS spectra, signal-to-noise ratio per receiver channel, and estimated error in determining the temperature and fraction of alpha particles are being carried out. The experimental spectra are simulated by adding noise to the theoretical calculation by a Monte Carlo technique. Error analysis is then performed by using a relative intensity calibrated nonlinear curve fitting code to calculate the desired plasma parameters (Ti, Tα, n α/ni). Simulation results indicate that expected background emission of 20 eV during Supershot in TFTR poses no problem to the experiment. Also short integration times (<10 ms) can be used to resolve the energetic ion features, thus offering a possibility for the study of temporal evolution of energetic ion velocity distribution during a single plasma shot.

AB - A large-angle, 60-GHz collective Thomson scattering (CTS) diagnostic system for localized measurements of DT alpha-particle velocity distribution and fraction is being implemented on TFTR. Calculations of expected CTS spectra, signal-to-noise ratio per receiver channel, and estimated error in determining the temperature and fraction of alpha particles are being carried out. The experimental spectra are simulated by adding noise to the theoretical calculation by a Monte Carlo technique. Error analysis is then performed by using a relative intensity calibrated nonlinear curve fitting code to calculate the desired plasma parameters (Ti, Tα, n α/ni). Simulation results indicate that expected background emission of 20 eV during Supershot in TFTR poses no problem to the experiment. Also short integration times (<10 ms) can be used to resolve the energetic ion features, thus offering a possibility for the study of temporal evolution of energetic ion velocity distribution during a single plasma shot.

UR - https://www.scopus.com/pages/publications/36449006989

UR - https://www.scopus.com/inward/citedby.url?scp=36449006989&partnerID=8YFLogxK

U2 - 10.1063/1.1143646

DO - 10.1063/1.1143646

M3 - Article

AN - SCOPUS:36449006989

SN - 0034-6748

VL - 63

SP - 4644

EP - 4646

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 10

ER -

Performance evaluation of the TFTR gyrotron CTS diagnostic for alpha particles

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this