Ultrafast spectroscopy diagnostic to measure localized ion temperature and toroidal velocity fluctuations

Date

2010-10-01

Author

Uzun Kaymak, İlker Ümit
McKee, G. R.
Schoenbeck, N.
Smith, D.
Winz, G.
Yan, Z.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

142
views

0
downloads

A dual-channel high-efficiency, high-throughput custom spectroscopic system has been designed and implemented at DIII-D to measure localized ion thermal fluctuations associated with drift wave turbulence. A large-area prism-coupled transmission grating and high-throughput collection optics are employed to observe C VI emission centered near lambda = 529 nm. The diagnostic achieves 0.25 nm resolution over a 2.0 nm spectral band via eight discrete spectral channels. A turbulence-relevant time resolution of 1 mu s is achieved using cooled high-speed avalanche photodiodes and ultralow-noise preamplifiers. The system sensitivity is designed to provide measurements of normalized ion temperature fluctuations on the order of delta T-i/T-i <= 1%. (C) 2010 American Institute of Physics. [doi:10.1063/1.3479114]

Subject Keywords

Instrumentation

URI

https://hdl.handle.net/11511/37992

Journal

REVIEW OF SCIENTIFIC INSTRUMENTS

DOI

https://doi.org/10.1063/1.3479114

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Overview of the beam emission spectroscopy diagnostic system on the National Spherical Torus Experiment Smith, D. R.; Feder, H.; Feder, R.; Fonck, R. J.; Labik, G.; McKee, G. R.; Schoenbeck, N.; Stratton, B. C.; Uzun Kaymak, İlker Ümit; Winz, G. (AIP Publishing, 2010-10-01) A beam emission spectroscopy (BES) system has been installed on the National Spherical Torus Experiment (NSTX) to study ion gyroscale fluctuations. The BES system measures D-alpha emission from a deuterium neutral heating beam. The system includes two optical views centered at r/a approximate to 0.45 and 0.85 and aligned to magnetic field pitch angles at the neutral beam. f/1.5 collection optics produce 2-3 cm spot sizes at the neutral beam. The initial channel layout includes radial arrays, poloidal arrays...
Mechanical stability of the CMS strip tracker measured with a laser alignment system Sirunyan, A. M.; et. al. (IOP Publishing, 2017-04-01) The CMS tracker consists of 206m(2) of silicon strip sensors assembled on carbon fibre composite structures and is designed for operation in the temperature range from -25 to + 25 degrees C. The mechanical stability of tracker components during physics operation was monitored with a few mu m resolution using a dedicated laser alignment system as well as particle tracks from cosmic rays and hadron-hadron collisions. During the LHC operational period of 2011-2013 at stable temperatures, the components of the ...
Feedback motion planning of unmanned surface vehicles via random sequential composition Ege, Emre; Ankaralı, Mustafa Mert (SAGE Publications, 2019-08-01) In this paper, we propose a new motion planning method that aims to robustly and computationally efficiently solve path planning and navigation problems for unmanned surface vehicles (USVs). Our approach is based on synthesizing two different existing methodologies: sequential composition of dynamic behaviours and rapidly exploring random trees (RRT). The main motivation of this integrated solution is to develop a robust feedback-based and yet computationally feasible motion planning algorithm for USVs. In ...
Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV Khachatryan, V.; et. al. (IOP Publishing, 2017-02-01) Improved jet energy scale corrections, based on a data sample corresponding to an integrated luminosity of 19.7 fb(-1) collected by the CMS experiment in proton-proton collisions at a center-of-mass energy of 8 TeV, are presented. The corrections as a function of pseudorapidity eta and transverse momentum (pT) are extracted from data and simulated events combining several channels and methods. They account successively for the effects of pileup, uniformity of the detector response, and residual data-simulat...
Wide-field turbulence imaging with beam emission spectroscopy McKee, G. R.; Fonck, R. J.; Shafer, M. W.; Uzun Kaymak, İlker Ümit; Yan, Z. (AIP Publishing, 2010-10-01) Imaging of the size, shape, time-averaged, and time-resolved dynamics of long-wavelength density turbulence structures is accomplished with an expanded, high-sensitivity, wide-field beam emission spectroscopy (BES) diagnostic on DIII-D. A 64-channel BES system is configured with an 8 X 8 grid of discrete channels that image an approximately 7 X 9 cm region at the outboard midplane. The grid covers multiple correlation lengths and each channel shape matches the measured radial-poloidal correlation length asy...

Citation Formats

İ. Ü. Uzun Kaymak, G. R. McKee, N. Schoenbeck, D. Smith, G. Winz, and Z. Yan, “Ultrafast spectroscopy diagnostic to measure localized ion temperature and toroidal velocity fluctuations,” REVIEW OF SCIENTIFIC INSTRUMENTS, pp. 0–0, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37992.