Measurement of the wall radiation in soft x-ray region in PDX (abstract)

Sesnic, S; Tenney, F H; Bitter, M; Hill, K W; von Goeler, S

doi:10.1063/1.1138067

Title: Measurement of the wall radiation in soft x-ray region in PDX (abstract)

Full Record
Other Related Research

Abstract

A detector setup with three LN-cooled Si(Li) diodes is used to measure soft x-ray spectra (0.8--20 keV) emitted from the inside walls of the PDX vessel during the plasma discharge. The setup is part of a pulse-height-analysis system, which is used to measure the plasma and wall radiation simultaneously at five different radial positions. The wall and the plasma radiation are measured under different plasma conditions (e.g., OH and neutral beam heating). The wall radiation is very much increased during the neutral beam heating, with an enhancement factor of at least 10 over the OH wall radiation. Since we measure the plasma and the wall radiation at the same time, the measurements allow the conclusion that the wall radiation can be attributed essentially to fluorescence (line radiation, e.g., Ti-K/sub ..cap alpha../) and scattering (continuum part of the wall radiation spectrum). The fluorescence and the scattering are both caused by soft x-ray radiation flux coming from the plasma. There seems to be no need to invoke other, more exotic causes for the wall radiation, for example, charge particle bombardment of the wall.

Authors:: Sesnic, S; Tenney, F H; Bitter, M; Hill, K W; von Goeler, S

Publication Date:: Wed May 01 00:00:00 EDT 1985

Research Org.:: Princeton University, Plasma Physics Laboratory, Princeton, New Jersey 08544

OSTI Identifier:: 5639053

Resource Type:: Journal Article

Journal Name:: Rev. Sci. Instrum.; (United States)

Additional Journal Information:: Journal Volume: 56:5

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; FIRST WALL; FLUORESCENCE; REFLECTIVITY; X-RAY SPECTRA; PDX DEVICES; PLASMA DIAGNOSTICS; MULTI-CHANNEL ANALYZERS; BEAM INJECTION HEATING; EFFICIENCY; ELECTRON TEMPERATURE; EXPERIMENTAL DATA; IMPURITIES; NEUTRAL ATOM BEAM INJECTION; SCATTERING; SOFT X RADIATION; BEAM INJECTION; CLOSED PLASMA DEVICES; DATA; ELECTROMAGNETIC RADIATION; ELECTRONIC EQUIPMENT; EQUIPMENT; HEATING; INFORMATION; IONIZING RADIATIONS; LUMINESCENCE; NUMERICAL DATA; OPTICAL PROPERTIES; PHYSICAL PROPERTIES; PLASMA HEATING; PULSE ANALYZERS; RADIATIONS; SPECTRA; SURFACE PROPERTIES; THERMONUCLEAR DEVICES; THERMONUCLEAR REACTOR WALLS; TOKAMAK DEVICES; X RADIATION; 700201* - Fusion Power Plant Technology- Blanket Engineering

Citation Formats


                    Sesnic, S, Tenney, F H, Bitter, M, Hill, K W, and von Goeler, S. Measurement of the wall radiation in soft x-ray region in PDX (abstract).  United States: N. p., 1985. 
        Web.  doi:10.1063/1.1138067.

Copy to clipboard


                    Sesnic, S, Tenney, F H, Bitter, M, Hill, K W, & von Goeler, S. Measurement of the wall radiation in soft x-ray region in PDX (abstract).  United States.  https://doi.org/10.1063/1.1138067

Copy to clipboard


                    Sesnic, S, Tenney, F H, Bitter, M, Hill, K W, and von Goeler, S. 1985.  
        "Measurement of the wall radiation in soft x-ray region in PDX (abstract)".  United States.  https://doi.org/10.1063/1.1138067.

Copy to clipboard


                    
@article{osti_5639053,

  title        = {Measurement of the wall radiation in soft x-ray region in PDX (abstract)},

  author       = {Sesnic, S and Tenney, F H and Bitter, M and Hill, K W and von Goeler, S},

  abstractNote = {A detector setup with three LN-cooled Si(Li) diodes is used to measure soft x-ray spectra (0.8--20 keV) emitted from the inside walls of the PDX vessel during the plasma discharge. The setup is part of a pulse-height-analysis system, which is used to measure the plasma and wall radiation simultaneously at five different radial positions. The wall and the plasma radiation are measured under different plasma conditions (e.g., OH and neutral beam heating). The wall radiation is very much increased during the neutral beam heating, with an enhancement factor of at least 10 over the OH wall radiation. Since we measure the plasma and the wall radiation at the same time, the measurements allow the conclusion that the wall radiation can be attributed essentially to fluorescence (line radiation, e.g., Ti-K/sub ..cap alpha../) and scattering (continuum part of the wall radiation spectrum). The fluorescence and the scattering are both caused by soft x-ray radiation flux coming from the plasma. There seems to be no need to invoke other, more exotic causes for the wall radiation, for example, charge particle bombardment of the wall.},

  doi          = {10.1063/1.1138067},

  url          = {https://www.osti.gov/biblio/5639053},
  journal      = {Rev. Sci. Instrum.; (United States)},
number       = ,

  volume       = 56:5,

  place        = {United States},

  year         = {Wed May 01 00:00:00 EDT 1985},

  month        = {Wed May 01 00:00:00 EDT 1985}

}

Copy to clipboard

Journal Article:

https://doi.org/10.1063/1.1138067

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Measurement of the wall radiation in soft x-ray region in PDX

Journal Article Sesnic, S; Tenney, F; Bitter, M; ... - Rev. Sci. Instrum.; (United States)

A detector setup with three LN-cooled Si(Li) diodes is used to measure soft x-ray spectra (0.8--20 keV) emitted from the inside walls of the PDX vessel during the plasma discharge. The setup is part of a pulse-height-analysis system, which is used to measure the plasma and wall radiation simultaneously at five different radial positions. The wall and the plasma radiation are measured under different plasma conditions (e.g., OH and neutral beam heating). The wall radiation is very much increased during the neutral beam heating, with an enhancement factor of at least 10 over the OH wall radiation. Since we measuremore »« less
https://doi.org/10.1063/1.1138022
Measurement of wall radiation in the soft x-ray region of PDX

Technical Report Sesnic, S; Tenney, F; Bitter, M; ...

A detector setup with three LN-cooled Si(Li) diodes is used to measure soft x-ray spectra (0.8 to 20 keV) emitted from the inside walls of the PDX vessel during the plasma discharge. This setup is part of a pulse-height-analysis system, which is used to measure the plasma and wall radiation simultaneously at five different radial positions. The wall and the plasma radiation are measured under different plasma conditions (e.g., OH and neutral beam heating). The wall radiation is increased very much during the neutral beam heating with an enhancement factor of at least 10 over OH wall radiation. Since wemore »« less
https://doi.org/10.2172/6040959

Full Text Available
Performance of the PDX neutral beam wall armor

Technical Report Kugel, H; Eubank, H; Kozub, T; ...

The PDX wall armor was designed to function as an inner wall thermal armor, a neutral beam diagnostic, and a large area inner toroidal plasma limiter. In this paper we discuss its thermal performance as wall armor during two years of PDX neutral beam heating experiments. During this period it provided sufficient inner wall protection to permit perpendicular heating injections into normal and disruptive plasmas as well as injections in the absence of plasma involving special experiments, calibrations, and tests important for the optimization and development of the PDX neutral beam injection system. Many of the design constraints and performancemore »« less
https://doi.org/10.2172/5959107

Full Text Available
Design of the PDX Tokamak wall armor and inner limiter system

Technical Report Kugel, H; Ulrickson, M

The inner wall protective plates for the PDX Tokamak are designed to absorb 8 MW of neutral deuterium beam power at maximum power densities of 3 kW/cm/sup 2/ for pulse lengths of 0.5 sec. Preliminary studies indicate that the design could survive several pulses of 1 sec duration. The design consists of a tile and mounting plate structure. The mounting plates are water cooled to allow short duty cycles and beam calorimetry. The temperature and flow of the coolant is measured to obtain the injected power. A thermocouple array on the tiles provides beam position and power density profiles. Severalmore »« less
https://doi.org/10.2172/6278317

Full Text Available
Measurement of density fluctuations in the PDX tokamak using microwave scattering techniques

Thesis/Dissertation Crowley, T

Density fluctuations in the PDX tokamak were analyzed with the scattering of 2 mm microwaves. The primary focus of the study was the low frequency (

Similar Records