Overview of the beam emission spectroscopy diagnostic system on the National Spherical Torus Experiment

Download

Date

2010-10-01

Author

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.

Metadata

Show full item record

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

Item Usage Stats

156
views

0
downloads

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, and two-dimensional grids. Radial arrays provide coverage from r/a approximate to 0.1 to beyond the last-closed flux surface. Photodetectors and digital filters provide high-sensitivity, low-noise measurements at frequencies of up to 1 MHz. The BES system will be a valuable tool for investigating ion gyroscale turbulence and Alfven/energetic particle modes on NSTX. (C) 2010 American Institute of Physics. [doi:10.1063/1.3478660]

Subject Keywords

Instrumentation

URI

https://hdl.handle.net/11511/40223

Journal

REVIEW OF SCIENTIFIC INSTRUMENTS

DOI

https://doi.org/10.1063/1.3478660

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Ultrafast spectroscopy diagnostic to measure localized ion temperature and toroidal velocity fluctuations Uzun Kaymak, İlker Ümit; McKee, G. R.; Schoenbeck, N.; Smith, D.; Winz, G.; Yan, Z. (AIP Publishing, 2010-10-01) 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 ...
Performance of photon reconstruction and identification with the CMS detector in proton-proton collisions at root s=8TeV Khachatryan, V.; et. al. (IOP Publishing, 2015-08-01) A description is provided of the performance of the CMS detector for photon reconstruction and identification in proton-proton collisions at a centre-of-mass energy of 8 TeV at the CERN LHC. Details are given on the reconstruction of photons from energy deposits in the electromagnetic calorimeter (ECAL) and the extraction of photon energy estimates. The reconstruction of electron tracks from photons that convert to electrons in the CMS tracker is also described, as is the optimization of the photon energy r...
Cosmic tests and performance of the ATLAS SemiConductor tracker barrels Demirköz, Melahat Bilge (Elsevier BV, 2007-03-01) ATLAS is a multi-purpose particle detector for the LHC and will detect proton collisions with center of mass energy of 14 TeV. Part of the central inner detector, the SemiConductor Tracker (SCT) barrel, is now fully integrated with the Transition Radiation Tracker (TRT) barrel. The SCT module performance has been measured after module production, after macro-assembly of modules onto barrels, after arrival at CERN and again partially after integration with the TRT. The module noise average per channel has be...
First results from VERITAS Hanna, D.; et. al. (Elsevier BV, 2008-04-01) VERITAS is an array of four, 12-m-diameter, Cherenkov telescopes, designed to explore the very-high-energy gamma-ray sky in the energy band between 100 GeV and 50 TeV. Its construction and commissioning have occurred over the past two years and the array has been taking scientific data with three or more telescopes since November 2006. We present results from observations made with VERITAS during the 1 past observing season, including new results on the distant blazar 1ES1218 + 304, the active galaxy M87 an...
Particle-flow reconstruction and global event description with the CMS detector Sirunyan, A. M.; et. al. (IOP Publishing, 2017-10-01) The CMS apparatus was identified, a few years before the start of the LHC operation at CERN, to feature properties well suited to particle-flow (PF) reconstruction: a highly-segmented tracker, a fine-grained electromagnetic calorimeter, a hermetic hadron calorimeter, a strong magnetic field, and an excellent muon spectrometer. A fully-fledged PF reconstruction algorithm tuned to the CMS detector was therefore developed and has been consistently used in physics analyses for the first time at a hadron collide...

Citation Formats

D. R. Smith et al., “Overview of the beam emission spectroscopy diagnostic system on the National Spherical Torus Experiment,” REVIEW OF SCIENTIFIC INSTRUMENTS, pp. 0–0, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40223.