High-resolution spectrometer for TOKAMAK plasma diagnostics

Elena A. Sokolova; Santiago D. Reyes Cortes; Nelson Mineiro

doi:10.1117/12.284058

25 September 1997 High-resolution spectrometer for TOKAMAK plasma diagnostics

Elena A. Sokolova, Santiago D. Reyes Cortes, Nelson Mineiro

Proceedings Volume 3130, Lens Design, Illumination, and Optomechanical Modeling; (1997) https://doi.org/10.1117/12.284058
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

High - resolution spectrometer was designed to resolve the fine structure of discharge emitted radiation near hydrogenous line 4648.8 Å. To achieve high resolution with relatively big aperture and only spherical optics the new method of the optical mounting calculation was applied. As it was mentioned1, some aberrations of the first part of the double monochromator can be compensated by its second part. For present device we chose the Rowland circle geometry for one wavelength. This geometry has no defocusing and meridional coma aberrations. The sagittal coma and the first order astigmatism were compensated using double monochromator mounting. To reduce aberrations for other wavelength of the spectral region the slight nonequidistancy of the grooves of two concave diffraction gratings was introduced. The device consists of two concave diffraction gratings with 2700 grooves per mm and the radius of curvature 500 mm. The theoretical limit of resolution for this case is 0.015 Å. The aberration limit of resolution, calculated using the mathematical model of spectrometer is 0.006 - 0.03 Å for the spectral region 4641.8 - 4661.6 Å. Because of property of the double monochromator mounting to compensate the second order astigmatism aberration1, the entrance slit of spectrometer can be high, more than 10-20 mm. Then, it is possible to analyse a number of emitting points simultaneously.

Citation Download Citation

Elena A. Sokolova, Santiago D. Reyes Cortes, and Nelson Mineiro "High-resolution spectrometer for TOKAMAK plasma diagnostics", Proc. SPIE 3130, Lens Design, Illumination, and Optomechanical Modeling, (25 September 1997); https://doi.org/10.1117/12.284058

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available