Published Data
These pages provide an access point to data contained in CCFE published journal papers. By selecting a paper, and then a specific figure or table, you can request the related underlying data if it is available for release.
Publication Figures
Publication Date:
0000-00-00
First Author:
K G McClements
Title:
Particle acceleration during merging-compression plasma start-up in the Mega Amp Spherical Tokamak
Paper Identifier:
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| Figure Reference | Title | Description | Number of Figure Data Items | Identifier | Download Figure Details | ||
|---|---|---|---|---|---|---|---|
| Figure 1 | Layout of the MAST NPA system and neutral beams | This figure shows the layout of the MAST NPA system and neutral beams, as seen from above. The black lines indicate the possible NPA lines-of-sight: RNPA is the shortest distance between one of these lines and the centre of the torus. Note that the neutral beams were not used during the merging-compression phase of MAST pulses. | 0 | CF/17/199 | Download | ||
| Figure 2 | Ion energy spectra recorded by the MAST NPA | This figure shows deuterium and hydrogen energy spectra recorded by the MAST NPA during the merging phase of pulse 9153. | 0 | CF/17/200 | Download | ||
| Figure 3 | Neutral particle fluxes of 16 keV protons versus time in MAST pulses with different NPA lines-of-sight. | This figure shows neutral particle fluxes of 16 keV protons versus time in MAST pulses 9153 (RNPA = 0.7 m) and 9161 (RNPA = -0.46 m). | 0 | CF/17/201 | Download | ||
| Figure 4 | Dynamic spectrum of microwave emission recorded using SAMI during the first 10ms of MAST pulse 28146 | SAMI detects emission in fifteen different frequency channels sequentially, with 8 microseconds of data acquisition per channel and a total sweep time over all channels of 160 microseconds. Short-lived bursts of emission were detected using this instrument in many pulses during the merging phase of MAST pulses: an example is shown in this figure. The microwave intensity at the peak emission frequency, averaged over the 150 microsecond sweep time, was about 14 dB above the background (thermal) level, but instantaneous intensities of up to about 30 dB above the background were recorded in one of the SAMI channels. The bursts are narrow-band, in this case peaking at a frequency of around 28 GHz. In this particular burst supra-thermal emission occurred in only three channels and was recorded in only one frequency sweep, which means that the burst duration could have been as short as 27 microseconds. | 0 | CF/17/202 | Download | ||
| Figure 5 | Frequency distribution of microwave bursts with intensity enhancements of at least 15 dB above noise level | This figure shows the frequency distribution of microwave bursts detected during the merging phase of MAST pulses with intensity enhancements of at least 15 dB above the noise. The most common burst frequency is 24.5 GHz, but the distribution extends across almost the entire SAMI range (10-34.5 GHz). These pulses all had similar toroidal field values, and hence similar values of electron cyclotron frequency at a given major radius. | 0 | CF/17/203 | Download | ||
| Figure 6 | Simulated deuterium and hydrogen energy spectra during merging-compression in MAST | This figure shows simulated energy spectra of deuterium and hydrogen ions resulting from electric fields induced by merging-compression in MAST. The simulations were carried out using the CUEBIT full orbit code. Full details of the parameters used in the simulations can be found in the text of the paper. | 0 | CF/17/204 | Download | ||
| Figure 7 | Simulated energy distributions of accelerated deuterons with different ranges of pitch during merging in MAST | This figure shows the computed energy distributions of deuterons with v_phi/v in the range 0.97-1.00 (green curve) and in the range 0.94-0.97 (blue curve) at the end of a CUEBIT simulation with delta-R = 0.1m, delta-Z = 0.02m. In the energy range used in the figure (chosen to provide an exact comparison to NPA data), a negligible number of ions had v_phi/v < 0.94. | 0 | CF/17/205 | Download | ||
| Figure 8 | Electrostatic field amplitude versus wave number and frequency in EPOCH simulation with bulk plasma parameters characteristic of merging plasmas in MAST and a dilute suprathermal electron beam | This figure was obtained from a particle-in-cell (EPOCH) simulation of a plasma with parameters characteristic of merging plasmas in MAST and a dilute suprathermal electron beam. It is a logarithmic plot of the longitudinal (i.e. parallel to the wave vector) electric field amplitude in wave number/frequency space, obtained by Fourier analysing the simulation results corresponding to a period between 832 and 999 electron cyclotron periods after t = 0. | 0 | CF/17/206 | Download | ||
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