UKAEA Papers

"Mitigation of disruption electro-magnetic load with SPI on JET-ILW"

• S.N. Gerasimov
• P. Abreu
• L.R. Baylor
• A. Boboc
• I.S. Carvalho
• I.H. Coffey
• D. Craven
• V. Huber
• S. Jachmich
• E. Joffrin
• U. Kruezi
• M. Lehnen
• P.J. Lomas
• A. Manzanares
• M. Maslov
• E. Matveeva
• G. Pautasso
• A. Peacock
• S. Silburn
• C. Stuart
• H. Sun
• D. Shiraki
• R. Sweeney
• J. Wilson
• L.E. Zakharov

The disruption mitigation system at ITER will include four shattered pellet injectors (SPI), which will be dedicated to the mitigation of electro-magnetic loads (EML), thermal loads and the avoidance and suppression of runaway electrons. Recently the JETILW was equipped with an SPI with a wide capability. Specifically: pellet diameter d = [4.57, 8.…

"Pedestal Stability Analysis on MAST in preparation for MAST-U"

• M. Knolker
• T. Osborne
• E. Belli
• S. Henderson
• A. Kirk
• L. Kogan
• S. Saarelma
• P. B. Snyder

In preparation for the upcoming MAST-U campaign, pedestal stability of spherical tokamaks is revisited by investigating standard H-mode discharges on MAST. As a step beyond previous studies, both ion and electron profiles are used for obtaining equilibria and a diverse set of pedestals is evaluated. Stability analysis with the ELITE and CGYRO codes…

"Grazing incidence spectra of highly ionized oxygen in a theta-pinch"

• NJ Peacock

"Grazing incidence spectra of highly-ionized atoms from laboratory plasmas"

• BC Fawcett
• AH Gabriel
• BB Jones
• NJ Peacock

"Vacuum ultra-violet radiation from a magnetically compressed plasma"

• AH Gabriel
• GBF Niblett
• NJ Peacock

"Modelling spectral emission from fusion plasmas"

• H. P. Summers
• N. R. Badnell
• A. R. Foster
• A. Giunta
• F. Guzmán
• et al.

The paper is a tribute to Nicol Peacock and has a focus on interests and developments at Culham Laboratory from ~ 1970 when Nicol led the UKAEA spectroscopy team. The paper charts a little of the evolution of these models and their data through the seventies and eighties on into this century at Culham. The paper concludes with the state of efforts …

"Spatial resolution of the JET Thomson scattering system"

• L. Frassinetti
• M. N. A. Beurskens
• R. Scannell
• T. H. Osborne
• J. Flanagan
• et al.

"Pedestal density fluctuation dynamics during the inter-ELM cycle in DIII-D"

• Z. Yan
• G.R. Mckee
• R.J. Groebner
• P.B. Snyder
• T.H. Osborne
• M.N. Beurskens
• K.H. Burrell

Detailed 2D measurements of long-wavelength density fluctuations in the pedestal region with beam emission spectroscopy during the period between edge localized modes (ELMs) indicate two distinct bands of fluctuations propagating in opposite poloidal directions in the plasma frame: one lower frequency band (50–150 kHz) advects in the ion-diamagne…

"Deconvolution of Thomson scattering temperature profiles"

• R. Scannell
• M. Beurskens
• P.G. Carolan
• A. Kirk
• M. Walsh
• T. O’Gorman
• T.H. Osborne

Deconvolution of Thomson scattering (TS) profiles is required when the gradient length of the electron temperature ( T e ) or density ( n e ) are comparable to the instrument function length ( R ). The most correct method for deconvolution to obtain underlying T e and n e profiles is by consideration of scattered signals. However, deconvolution at …

"Variation in Lyman-a fine structure components for Cl XVII during a tokamak plasma shot"

• J. M. A. Ashbourn
• P. Mcginnity
• N. J. Peacock

In this Brief Report we study the measured and modeled Lyman- a intensity ratios for hydrogenlike Cl XVII in a deuterium base plasma in the Joint European Torus tokamak and examine the agreement between experiment and theory for a particular plasma shot. A collisional-radiative model is used to calculate the values of the intensity ratios using mea…