UKAEA Papers

"Electron Bernstein Wave (EBW) current drive profiles and efficiency for STEP"

• T. Wilson
• S.J. Freethy
• M. Henderson
• A Köhn-Seeman
• I. Konoplev
• S. Saarelma
• D. Speirs
• R.G.L. Vann
• the STEP team

The UK’s Spherical Tokamak for Energy Production (STEP) reactor design program is now exclusively investigating concepts using microwave-based heating and current drive (HCD) systems. Electron Bernstein Wave (EBW) HCD is a relatively immature technology compared to Electron Cyclotron (EC) HCD but is of interest due to the promise of high current…

"Effect of mismatch on Doppler backscattering in MAST plasmas"

• V.H. Hall-Chen
• F.I. Parra
• J.C. Hillesheim
• J. Ruiz Ruiz
• N.A. Crocker
• P. Shi
• H.S. Chu
• S.J. Freethy
• L.A. Kogan
• W.A. Peebles
• Q.T. Pratt
• T.L. Rhodes
• K. Ronald
• R. Scannell
• D.C. Speirs
• S. Storment
• J. Trisno

Doppler reflectometry, or the Doppler backscattering (DBS) diagnostic, enables the measurement of turbulent density fluctuations of intermediate length scales, typically $10 gtrsim k_perp rho_i gtrsim 1$; here $k_perp$ is the turbulence’s wavenumber and $rho_i$ is the ion gyroradius. The backscattered power is proportional to the power of the tur…

Page 1 of 1