Simulations of alpha parameters in a TFTR DT supershot with high fusion power

Budny, R.; Bell, M.G.; Janos, A.; Jassby, D.L.; Johnson, L. C.; Mansfield, D. K.; McCune, D.; Redi, M. H.; Schivell, J.; Taylor, G.; Terpstra, T.; Zarnstorff, M. C.; Zweben, S. J.

doi:10.1088/0029-5515/35/12/i10

Cited by 114 publications

(107 citation statements)

References 18 publications

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“…4. The alpha distribution functions in pitch angle and energy were similar to those described previously for a 7.5 MW DT discharge [19].…”

Section: [6]supporting

confidence: 72%

“…Alpha particle density profiles, energy spectra, heating power, loss fractions, etc. have been calculated as a function of time for most TFTR DT discharges using TRANSP [18,19]. The alpha particle parameters for the discharge with the highest fusion power (#80539) are shown in Table 1, and TRANSP results for the time evolution and radial profiles of alphas in this discharge are illustrated in Figs.…”

Section: [6]mentioning

confidence: 99%

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Alpha particle physics experiments in the Tokamak Fusion Test Reactor

Zweben¹,

Budny²,

Darrow³

et al. 2000

Nucl. Fusion

Self Cite

106

104

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Alpha particle physics experiments were done on the Tokamak Fusion Test Reactor (TFTR) during its deuterium-tritium (DT) run from 1993-1997. These experiments utilized several new alpha particle diagnostics and hundreds of DT discharges to characterize the alpha particle confinement and wave-particle interactions. In general, the results from the alpha particle diagnostics agreed with the classical singleparticle confinement model in magnetohydrodynamic (MHD) quiescent discharges. Also, the observed alpha particle interactions with sawteeth, toroidal Alfvén eigenmodes (TAE), and ion cyclotron resonant frequency (ICRF) waves were roughly consistent with theoretical modeling. This paper reviews what was learned and identifies what remains to be understood.2

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“…4. The alpha distribution functions in pitch angle and energy were similar to those described previously for a 7.5 MW DT discharge [19].…”

Section: [6]supporting

confidence: 72%

Section: [6]mentioning

confidence: 99%

Alpha particle physics experiments in the Tokamak Fusion Test Reactor

Zweben¹,

Budny²,

Darrow³

et al. 2000

Nucl. Fusion

Self Cite

106

104

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show abstract

“…Fast-ion distributions can also be read from an external file. This option is very useful to import the distribution functions as calculated with other codes such as the TRANSP/NUBEAM [22,23] package.…”

Section: Particle Distributionsmentioning

confidence: 99%

A description of the full-particle-orbit-following SPIRAL code for simulating fast-ion experiments in tokamaks

Kramer

Budny

Bortolon

et al. 2013

Plasma Phys. Control. Fusion

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The numerical methods used in the full particle-orbit following SPIRAL code are described and a number of physics studies performed with the code are presented to illustrate its capabilities. The SPIRAL code is a test-particle code and is a powerful numerical tool to interpret and plan fast-ion experiments in tokamaks. Gyro-orbit effects are important for fast ions in low-field machines such as NSTX and to a lesser extent in DIII-D. A number of physics studies are interlaced between the description of the code to illustrate its capabilities. Results on heat loads generated by a localized error-field on the DIII-D wall are compared with measurements. The enhanced Triton losses caused by the same localized error-field are calculated and compared with measured neutron signals. Magnetohydrodynamic (MHD) activity such as tearing modes and toroidicity-induced Alfvén eigenmodes (TAEs) have a profound effect on the fast-ion content of tokamak plasmas and SPIRAL can calculate the effects of MHD activity on the confined and lost fast-ion population as illustrated for a burst of TAE activity in NSTX. The interaction between ion cyclotron range of frequency (ICRF) heating and fast ions depends solely on the gyro-motion of the fast ions and is captured exactly in the SPIRAL code. A calculation of ICRF absorption on beam ions in ITER is presented. The effects of high harmonic fast wave heating on the beam-ion slowing-down distribution in NSTX is also studied.

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“…The experimental conditions are summarized in Section 2 and the methods in Section 3. The measured spectral power densities of scattered radiation are compared with synthetic CTS spectra calculated with a scattering model [38,39] using fast ion velocity distributions obtained with the simulation codes TRANSP/NUBEAM [40,41] or ASCOT [42,43] (Section 4.1). Moreover, the inferred one-dimensional fast ion velocity distributions obtained for this experiment are presented and compared with the simulations (Section 4.2).…”

Section: Introductionmentioning

confidence: 99%

Comparison of fast ion collective Thomson scattering measurements at ASDEX Upgrade with numerical simulations

Salewski¹,

Méo²,

Stejner³

et al. 2010

Nucl. Fusion

100

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Abstract. Collective Thomson scattering (CTS) experiments were carried out at ASDEX Upgrade to measure the one-dimensional velocity distribution functions of fast ion populations. These measurements are compared with simulations using the codes TRANSP/NUBEAM and ASCOT for two different neutral beam injection (NBI) configurations: two NBI sources and only one NBI source. The measured CTS spectra as well as the inferred one-dimensional fast ion velocity distribution functions are clearly asymmetric as a consequence of the anisotropy of the beam ion populations and the selected geometry of the experiment. As expected, the one-beam configuration can clearly be distinguished from the two-beam configuration. The fast ion population is smaller and the asymmetry is less pronounced for the one-beam configuration. Salient features of the numerical simulation results agree with the CTS measurements while quantitative discrepancies in absolute values and gradients are found.

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Simulations of alpha parameters in a TFTR DT supershot with high fusion power

Cited by 114 publications

References 18 publications

Alpha particle physics experiments in the Tokamak Fusion Test Reactor

Alpha particle physics experiments in the Tokamak Fusion Test Reactor

A description of the full-particle-orbit-following SPIRAL code for simulating fast-ion experiments in tokamaks

Comparison of fast ion collective Thomson scattering measurements at ASDEX Upgrade with numerical simulations

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