Multilayer mirror based line emission tomography for spherical Tokamaks

D. Stutman; Y. S. Hwang; J. Menard; W. Choe; M. Ono; M. Finkenthal; M. J. May; S. P. Regan; V. Soukhanovskii; H. W. Moos

doi:10.1063/1.1147786

Multilayer mirror based line emission tomography for spherical Tokamaks

D. Stutman^*, Y. S. Hwang, J. Menard, W. Choe, M. Ono, M. Finkenthal, M. J. May, S. P. Regan, V. Soukhanovskii, H. W. Moos

^*Corresponding author for this work

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

6 Scopus citations

Abstract

Due to their highly shaped plasma and possible poloidal asymmetry in impurity concentration, spherical Tokamaks will require tomographic reconstruction of local emissivities to assess impurity content and transport. To collect in an effective manner the data required for such reconstruction, we develop arrays of high throughput "mini-monochromators" using extreme ultraviolet multilayer mirrors as dispersive elements and filtered surface barrier diodes as detectors. We discuss monochromator optimization and show that by working at near normal incidence throughput and spectral resolution are simultaneously maximized. A system proposed for tomographic reconstruction of C V and C VI resonance emission at 33.7 and 40.5 Å respectively, achieves 0.9 Å spectral resolution, 2 cm spatial resolution, and 0.2 ms temporal resolution, together with good sensitivity and background rejection. Preliminary results obtained from CDX-U low aspect ratio tokamak are also presented.

Original language	English
Pages (from-to)	1055-1058
Number of pages	4
Journal	Review of Scientific Instruments
Volume	68
Issue number	1
DOIs	https://doi.org/10.1063/1.1147786
State	Published - Jan 1997
Externally published	Yes

Access to Document

10.1063/1.1147786

Cite this

@article{fbc048e8aaa944979e16341da4560f1f,

title = "Multilayer mirror based line emission tomography for spherical Tokamaks",

abstract = "Due to their highly shaped plasma and possible poloidal asymmetry in impurity concentration, spherical Tokamaks will require tomographic reconstruction of local emissivities to assess impurity content and transport. To collect in an effective manner the data required for such reconstruction, we develop arrays of high throughput {"}mini-monochromators{"} using extreme ultraviolet multilayer mirrors as dispersive elements and filtered surface barrier diodes as detectors. We discuss monochromator optimization and show that by working at near normal incidence throughput and spectral resolution are simultaneously maximized. A system proposed for tomographic reconstruction of C V and C VI resonance emission at 33.7 and 40.5 {\AA} respectively, achieves 0.9 {\AA} spectral resolution, 2 cm spatial resolution, and 0.2 ms temporal resolution, together with good sensitivity and background rejection. Preliminary results obtained from CDX-U low aspect ratio tokamak are also presented.",

author = "D. Stutman and Hwang, {Y. S.} and J. Menard and W. Choe and M. Ono and M. Finkenthal and May, {M. J.} and Regan, {S. P.} and V. Soukhanovskii and Moos, {H. W.}",

year = "1997",

month = jan,

doi = "10.1063/1.1147786",

language = "אנגלית",

volume = "68",

pages = "1055--1058",

journal = "Review of Scientific Instruments",

issn = "0034-6748",

publisher = "American Institute of Physics",

number = "1",

}

TY - JOUR

T1 - Multilayer mirror based line emission tomography for spherical Tokamaks

AU - Stutman, D.

AU - Hwang, Y. S.

AU - Menard, J.

AU - Choe, W.

AU - Ono, M.

AU - Finkenthal, M.

AU - May, M. J.

AU - Regan, S. P.

AU - Soukhanovskii, V.

AU - Moos, H. W.

PY - 1997/1

Y1 - 1997/1

N2 - Due to their highly shaped plasma and possible poloidal asymmetry in impurity concentration, spherical Tokamaks will require tomographic reconstruction of local emissivities to assess impurity content and transport. To collect in an effective manner the data required for such reconstruction, we develop arrays of high throughput "mini-monochromators" using extreme ultraviolet multilayer mirrors as dispersive elements and filtered surface barrier diodes as detectors. We discuss monochromator optimization and show that by working at near normal incidence throughput and spectral resolution are simultaneously maximized. A system proposed for tomographic reconstruction of C V and C VI resonance emission at 33.7 and 40.5 Å respectively, achieves 0.9 Å spectral resolution, 2 cm spatial resolution, and 0.2 ms temporal resolution, together with good sensitivity and background rejection. Preliminary results obtained from CDX-U low aspect ratio tokamak are also presented.

AB - Due to their highly shaped plasma and possible poloidal asymmetry in impurity concentration, spherical Tokamaks will require tomographic reconstruction of local emissivities to assess impurity content and transport. To collect in an effective manner the data required for such reconstruction, we develop arrays of high throughput "mini-monochromators" using extreme ultraviolet multilayer mirrors as dispersive elements and filtered surface barrier diodes as detectors. We discuss monochromator optimization and show that by working at near normal incidence throughput and spectral resolution are simultaneously maximized. A system proposed for tomographic reconstruction of C V and C VI resonance emission at 33.7 and 40.5 Å respectively, achieves 0.9 Å spectral resolution, 2 cm spatial resolution, and 0.2 ms temporal resolution, together with good sensitivity and background rejection. Preliminary results obtained from CDX-U low aspect ratio tokamak are also presented.

UR - http://www.scopus.com/inward/record.url?scp=0347921113&partnerID=8YFLogxK

U2 - 10.1063/1.1147786

DO - 10.1063/1.1147786

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:0347921113

SN - 0034-6748

VL - 68

SP - 1055

EP - 1058

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 1

ER -

Multilayer mirror based line emission tomography for spherical Tokamaks

Abstract

Access to Document

Other files and links

Fingerprint

Cite this