Explanipedia

Photodissociation Dynamics in (N2)n+ Clusters Open

John R. C. Blais, B. Stratton, Nathan J. Dynak, Brandon M. Rittgers, Douglas Kellar , et al. · 2025

(N₂)_n⁺ cluster ions are produced and cooled in a pulsed-discharge supersonic expansion and studied with UV laser photodissociation and velocity-map imaging (VMI). All cluster sizes up to n = 1…

Cation-π Bonding in Actinides: UOx+(Benzene) (x = 0, 1, 2) Complexes Studied with Threshold Photodissociation Spectroscopy and Theory Open

Jason E. Colley, Anna G. Batchelor, B. Stratton, Michael A. Duncan · 2025

Cation-π complexes of the form UO_x⁺(benzene) (x = 0, 1, 2) are produced by laser vaporization and cooled in a supersonic molecular beam. These ions are mass selected and studied with UV-visible laser pho…

Hydrogen desorption kinetics of hafnium hydride powders Open

J.P. Pollard, Antoine Dumain, B. Stratton, Sandeep Irukuvarghula, Jeffrey C. Astbury , et al. · 2024

The kinetics of hydrogen gas release from hafnium hydride are investigated by combining experiments and density functional theory. The material is a candidate neutron moderator and attenuator for compact nuclear reactors, where hydrogen re…

Determination of the mean energy of fast electron losses and anisotropies through thick-target emission on WEST Open

T. Barbui, L. Delgado-Aparicio, B. Stratton, O. Chellaï, R. Dümont , et al. · 2024

A new method to obtain the mean energy of fast electron losses in fusion plasmas using a versatile multi-energy hard x-ray (HXR) detector is presented. The method is based on measuring the thick-target emission of tungsten in the divertor …

Data for "NSTX-U research advancing the physics of spherical tokamaks" Open

Jack Berkery, Promise Adebayo-Ige, Hassan Al Khawaldeh, G. Avdeeva, S. G. Baek , et al. · 2024

The National Spherical Torus Experiment-Upgrade poloidal high-k scattering system pitch angle design modifications Open

X. Liu, C. W. Domier, Jon Dannenberg, Yilun Zhu, Jagadishwar R. Sirigiri , et al. · 2022

A 693 GHz, eight-channel, poloidal high-k (k refers to wavenumber) collective scattering system is under development for the National Spherical Torus Experiment-Upgrade device. It will replace the previous 280 GHz, five-channel, tangential…

Spatial calibration and synthetic diagnostic of a multi-energy hard x-ray camera at WEST tokamak Open

T. Barbui, O. Chellaï, L. Delgado-Aparicio, Y. Peysson, B. Stratton , et al. · 2022

WEST (tungsten environment in steady-state tokamak) is starting operation for the first time with a water-cooled full tungsten divertor, enabling long pulse operation. Heating is provided by radiofrequency systems, including lower hybrid c…

A poloidal high-k scattering system for NSTX-U Open

C. W. Domier, Jon Dannenberg, Yilun Zhu, X. Liu, Jagadishwar R. Sirigiri , et al. · 2022

A previous 5-channel tangential high- k scattering system is being replaced by an 8-channel, poloidal high- k scattering system on the National Spherical Torus eXperiment Upgrade (NSTX-U) device located in Princeton, NJ, USA. The 693 GHz p…

Design and engineering challenges of a multi-energy hard x-ray camera for long-pulse profile measurements at WEST tokamak Open

T. Barbui, O. Chellaï, L. Delgado-Aparicio, R. Ellis, K. W. Hill , et al. · 2021

Multi-energy reconstructions, central electron temperature measurements, and early detection of the birth and growth of runaway electrons using a versatile soft x-ray pinhole camera at MST Open

L. Delgado-Aparicio, P. VanMeter, T. Barbui, O. Chellaï, John Wallace , et al. · 2021

A multi-energy soft x-ray pinhole camera has been designed, built, and deployed at the Madison Symmetric Torus to aid the study of particle and thermal transport, as well as MHD stability physics. This novel imaging diagnostic technique em…

Recent Physics Results from NSTX Open

J. Ménard, M.G. Bell, R. E. Bell, J. Bialek, J.A. Boedo , et al. · 2021

The National Spherical Torus Experiment (NSTX) has made considerable progress in advancing the scientific understanding of high performance long-pulse plasmas needed for ITER and future low-aspect-ratio Spherical Torus (ST) devices. Plasma…

Calibration of a versatile multi-energy soft x-ray diagnostic for WEST long pulse plasmas Open

O. Chellaï, L. Delgado-Aparicio, P. VanMeter, T. Barbui, John Wallace , et al. · 2021

A compact multi-energy soft x-ray diagnostic is being installed on the W Environment in Steady-state Tokamak (WEST), which was designed and built to test ITER-like tungsten plasma facing components in a long pulse (∼1000 s) scenario. The d…

A new class of focusing crystal shapes for Bragg spectroscopy of small, point-like, x-ray sources in laser produced plasmas Open

M. Bitter, N. Pablant, K. W. Hill, Lan Gao, Brian Kraus , et al. · 2021

This paper describes a new class of focusing crystal forms for the x-ray Bragg crystal spectroscopy of small, point-like, x-ray sources. These new crystal forms are designed with the aid of sinusoidal spirals, a family of curves, whose sha…

Multi-energy calibration of a PILATUS3 CdTe detector for hard x-ray measurements of magnetically confined fusion plasmas Open

T. Barbui, L. Delgado-Aparicio, N. Pablant, C. Disch, B. Luethi , et al. · 2021

A multi-energy hard x-ray pin-hole camera based on the PILATUS3 X 100K-M CdTe detector has been developed at the Princeton Plasma Physics Laboratory for installation on the Tungsten Environment in Steady State Tokamak. This camera will be …

UWAVS first mirror after long plasma cleaning: Surface properties and material re-deposition issues Open

A.G. Ushakov, Ad Verlaan, Rob Ebeling, Chien‐Ching Wu, R.C. O’Neill , et al. · 2019

Two-dimensional AXUV-based radiated power density diagnostics on NSTX-U Open

I. Faust, L. Delgado-Aparicio, R. E. Bell, K. Tritz, A. Diallo , et al. · 2019

A new set of radiated-power-density diagnostics for the National Spherical Torus Experiment Upgrade (NSTX-U) tokamak have been designed to measure the two-dimensional poloidal structure of the total photon emissivity profile in order to pe…

The high-k poloidal scattering system for NSTX-U Open

Robert Barchfeld, C. W. Domier, Y. Ren, R. Ellis, P. Riemenschneider , et al. · 2018

An 8-channel, high-k poloidal far-infrared (FIR) scattering system is under development for the National Spherical Torus eXperiment Upgrade (NSTX-U). The 693 GHz poloidal scattering system replaces a 5-channel, 280 GHz high-k toroidal scat…

Simulation, design, and first test of a multi-energy soft x-ray (SXR) pinhole camera in the Madison Symmetric Torus (MST) Open

L. Delgado-Aparicio, John Wallace, H. Yamazaki, P. VanMeter, L. M. Reusch , et al. · 2018

A multi-energy soft x-ray pinhole camera has been designed and built for the Madison Symmetric Torus reversed field pinch to aid the study of particle and thermal-transport, as well as MHD stability physics. This novel imaging diagnostic t…

A computational tool for simulation and design of tangential multi-energy soft x-ray pin-hole cameras for tokamak plasmas Open

H. Yamazaki, L. Delgado-Aparicio, R. J. Groebner, B. A. Grierson, K. W. Hill , et al. · 2018

A new tool has been developed to calculate the spectral, spatial, and temporal responses of multi-energy soft x-ray (ME-SXR) pinhole cameras for arbitrary plasma densities (ne,D), temperature (Te), and impurity densities (nZ). ME-SXR imagi…

A new toroidal x-ray crystal spectrometer for the diagnosis of high energy density plasmas at the National Ignition Facility Open

M. Bitter, K. W. Hill, Lan Gao, Brian Kraus, P. C. Efthimion , et al. · 2018

The here-described spectrometer was developed for the extended x-ray absorption fine structure spectroscopy of high-density plasmas at the National Ignition Facility. It employs as the Bragg reflecting element a new type of toroidally bent…

Experimental tests of an infrared video bolometer on Alcator C-Mod Open

M.L. Reinke, J. L. Terry, G.G. van Eden, B. J. Peterson, K. Mukai , et al. · 2018

A prototype of an infrared imaging bolometer (IRVB) was successfully tested on the Alcator C-Mod tokamak at the end of its 2016 campaign. The IRVB method interprets the power radiated from the plasma by measuring the temperature rise of a …

ITER upper port wide angle viewing system optical design and performance analysis Open

Ad Verlaan, Peter Giesen, Pascal van Grol, M.P.M.A. Limpens, Jeroen Heijmans , et al. · 2018

Removing W-contaminants in helium and neon RF plasma to maintain the optical performance of the ITER UWAVS first mirror Open

A.G. Ushakov, Ad Verlaan, Rob Ebeling, André Rijfers, R.C. O’Neill , et al. · 2018

Four-Wave-Mixing Approach to In Situ Detection of Nanoparticles Open

Alexandros Gerakis, Yao‐Wen Yeh, Mikhail N. Shneider, James Mitrani, B. Stratton , et al. · 2018

Here, we report on the development and experimental validation of a laser-based technique which uses coherent Rayleigh-Brillouin scattering (CRBS) to detect nanoparticles with characteristic sizes ranging from the atomic scale to tens of n…

Overview of NSTX Upgrade initial results and modelling highlights Open

J. Ménard, Jean Paul Allain, D.J. Battaglia, F. Bedoya, R. E. Bell , et al. · 2017

The National Spherical Torus Experiment (NSTX) has undergone a major upgrade, and the NSTX Upgrade (NSTX-U) Project was completed in the summer of 2015. NSTX-U first plasma was subsequently achieved, diagnostic and control systems have bee…

Design update of the ITER upper wide angle viewing system Open

Matthew Smiley, R.C. O’Neill, J. Vasquez, C.J. Lasnier, A.G. McLean , et al. · 2017

Overview of NSTX Upgrade Initial Results and Modelling Highlights Open

J. Ménard, Jean Paul Allain, D. J. Battaglia, F. Bedoya, R. E. Bell , et al. · 2017

The National Spherical Torus Experiment (NSTX) has undergone a major upgrade, and the NSTX Upgrade (NSTX-U) Project was completed in the summer of 2015. NSTX-U first plasma was subsequently achieved, diagnostic and control systems have bee…

Publisher’s Note: “Multi-energy x-ray detector calibration for Te and impurity density (nZ) measurements of MCF plasmas” [Rev. Sci. Instrum. 87, 11E320 (2016)] Open

J. Maddox, N. Pablant, P. C. Efthimion, L. Delgado-Aparicio, K. W. Hill , et al. · 2016

Correction Original Article: ISSN: 0034-6748, Rev. Sci. Instrum. 87, (2016) This article was originally published online on 12 August 2016 with the fourth author’s name listed as “L. Delgado”. It should have been “L. Delgado-Aparicio”. The…

Upper wide-angle viewing system for ITER Open

C.J. Lasnier, A.G. McLean, Anthony Gattuso, R.C. O’Neill, Matthew Smiley , et al. · 2016

The Upper Wide Angle Viewing System (UWAVS) will be installed on five upper ports of ITER. This paper shows major requirements, gives an overview of the preliminary design with reasons for some design choices, examines self-emitted IR ligh…

Development of plasma bolometers using fiber-optic temperature sensors Open

M.L. Reinke, Ming Han, G. Liu, G.G. van Eden, Rolf Evenblij , et al. · 2016

Measurements of radiated power in magnetically confined plasmas are important for exhaust studies in present experiments and expected to be a critical diagnostic for future fusion reactors. Resistive bolometer sensors have long been utiliz…

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