All Papers - UKAEA Scientific Publications

Showing 31 - 40 of 89 UKAEA Paper Results

UKAEA-CCFE-PR(20)092019

"Inference of divertor plasma characteristics using Bayesian multi-diagnostic analysis"
Advancing our understanding of divertor plasma physics is limited by an inability to directly determine the plasma characteristics (density, temperature, etc) over the entire divertor cross-section. At best, diagnostics are able to measure ne and Te at isolated points. More commonly however, diagnostics only measure higher-level quantities (e.g. em…
- Preprint
- Published
UKAEA-CCFE-CP(20)982018

"Optimization of JET-DT and ITER operation by developing an understanding of the role of low-Z impurity on the H-mode pedestal"
- C. Giroud
- N. Aiba
- F. Militello
- C. Challis
- A. Chankin
- B. Lomanowski
- D. Hatch
- J. Harrison
- D. Frigione
- D. Moulton
- S. Pamela
- F. Parra
- J. Parisi
- I. Putzai
- D. Refy
- S. Saarelma
- C. Stavrou
- B. Tal
- E. Belonohy
- S. Brezinsek
- S. Buller
- C. Bowman
- E. Delabie
- A. Field
- J. Fontdecaba
- A. Huber
- A. Meigs
- S. Menmuir
- J. Simpson
- JET Contributors
- Preprint
- Published
UKAEA-CCFE-CP(20)722018

"FUSION ENERGY DEVELOPMENT APPLICATIONS UTILIZING THE SPHERICAL TOKAMAK AND ASSOCIATED RESEARCH NEEDS AND TOOLS"
- J.E. Menard
- R. Majeski
- M. Ono
- N.N. Bakharev
- V.K. Gusev
- M. Gryaznevich
- D. Kingham
- S. McNamara
- P. Thomas
- K. Hanada
- J. Harrison
- B. Lloyd
- Y.S. Hwang
- B. Lipschultz
- H. Wilson
- Y. Nagayama
- Y. Ono
- Y. Takase
- M. Reinke
- K. Tobita
- Z. Gao
- F. Alladio
- R.J. Fonck
The spherical torus/tokamak (ST) is a potentially attractive configuration for narrowing scientific and technical gaps to a fusion demonstration power plant and as a more compact and/or modular fusion power source. Due to a reduced plasma surface area to volume ratio, the ST configuration offers the potential to access high power exhaust heat fl…
- Preprint
CLM P821965

"The determination of atomic collision cross sections using crossed electron and ion beams and some sources of error in such experiments"
- MFA Harrison
- Preprint
CLM P751965

"A measurement of the cross section for production of He ions by electron impact excitation of ground state helium ions"
- Preprint
UKAEA-CCFE-CP(19)422019

"Towards understanding the relative role of divertor geometry and magnetic topology on detachment"
- A. Fil
- B. Dudson
- B. Lipschultz
- D. Moulton
- O. Myatra
- K. Verhaegh
- O. Fevrier
- J. Harrison
- A. Thornton
- M. Wensing
Plasma detachment needs to be achieved in ITER [1] and future devices such as DEMO to dissipate most of the power in the Scrape-Off-Layer (SOL) and reduce the particle flux reaching the divertor targets. In order to enhance our capability to improve current, and design future tokamaks, we must improve our understanding of the relative effect on det…
- Preprint
- Published
UKAEA-CCFE-CP(19)402019

"Predicting Scrape-Off Layer profiles and filamentary transport for reactor relevant devices"
- F. Militello
- R. Akers
- L. Appel
- B. Cannas
- S. Carcangiu
- B. Dudson
- A. Fanni
- T. Farley
- A. Kirk
- J.R. Harrison
- B. Lipshultz
- A. Montisci
- T. Nicholas
- J.T. Omotani
- F. Pisano
- F. Riva
- G. Sias
- N.R. Walkden
- A. Wynn
- the MAST
- JET5 teams
In magnetic confinement devices, boundary turbulence is responsible for transporting plasma and energy from the well-confined region towards the material surfaces where it can severely harm reactor relevant machines. It is therefore essential to develop a solid understanding of the mechanisms behind the transport in the edge of the plasma. Large fl…
- Preprint
- Published
UKAEA-CCFE-PR(19)782019

"Filament identification in wide-angle high speed imaging of the Mega Amp Spherical Tokamak"
A new inversion technique is presented for the identification of plasma filaments in wide-angle visible camera data. Direct inversion of camera data onto a field aligned basis is a poorly conditioned problem which is overcome by breaking the analysis into a `psuedo-inversion’ step followed by a `point spread function correction’ step. Camera …
- Preprint
- Published
UKAEA-CCFE-CP(19)202019

"An assessment of nitrogen concentrations from spectroscopic measurements in the JET and ASDEX Upgrade divertor"
Reducing the plasma power exhaust impacting on plasma facing components during steady state operation is one of the major design issues in future tokamaks such as ITER. Impurity seeding, e.g. with N, is one method of achieving this and has been used for a long time in tokamak research [1]. In this work we exploit a recently developed spectroscopic …
- Preprint
- Published
UKAEA-CCFE-PR(19)472019

"The Digital Mirror Langmuir Probe: FPGA Implementation of Real-Time Langmuir Probe Biasing"
High bandwidth, high spatial resolution measurements of electron temperature, density and plasma potential are valuable for resolving turbulence in the boundary plasma of tokamaks. While conventional Langmuir probes can provide such measurements either their temporal or spatial resolution is limited: the former by the sweep rate necessary for obtai…
- Preprint
- Published

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"Inference of divertor plasma characteristics using Bayesian multi-diagnostic analysis"

"Optimization of JET-DT and ITER operation by developing an understanding of the role of low-Z impurity on the H-mode pedestal"

"FUSION ENERGY DEVELOPMENT APPLICATIONS UTILIZING THE SPHERICAL TOKAMAK AND ASSOCIATED RESEARCH NEEDS AND TOOLS"

"The determination of atomic collision cross sections using crossed electron and ion beams and some sources of error in such experiments"

"A measurement of the cross section for production of He ions by electron impact excitation of ground state helium ions"

"Towards understanding the relative role of divertor geometry and magnetic topology on detachment"

"Predicting Scrape-Off Layer profiles and filamentary transport for reactor relevant devices"

"Filament identification in wide-angle high speed imaging of the Mega Amp Spherical Tokamak"

"An assessment of nitrogen concentrations from spectroscopic measurements in the JET and ASDEX Upgrade divertor"

"The Digital Mirror Langmuir Probe: FPGA Implementation of Real-Time Langmuir Probe Biasing"

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