On the low-temperature nuclear spin–lattice relaxation in amorphous materials

Zakharov, L. Zh.; Lepsveridze, R. L.

doi:10.1063/1.593906

Low Temperature Physics

2000

DOI: 10.1063/1.593906

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On the low-temperature nuclear spin–lattice relaxation in amorphous materials

L. Zh. Zakharov

R. L. Lepsveridze

Abstract: A study is made of the mechanism of nuclear magnetic relaxation due to the indirect interaction of the nuclear spins with two-level systems. The sources of this indirect interaction are the hyperfine interaction of the nuclear spins with the electron spin and the interaction of the electron spins with the two-level systems. It is shown that the mechanism proposed in this paper is effective under certain conditions.

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2013

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Real-time control of the period of individual ELMs by EC power on TCV

Felici

Rossel²,

Duval³

et al. 2013

Nucl. Fusion

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The period of individual type-I edge-localized modes (ELMs) in TCV H-mode plasmas is controlled by real-time controlled application of electron cyclotron (EC) power close to the plasma pedestal. An ELM pacing algorithm, closely related to sawtooth pacing (Goodman et al (2011 Phys. Rev. Lett. 106 245002)) has been implemented in the TCV control system. This algorithm switches the EC power to a low level after detecting an ELM, and subsequently increases the power to a higher level after a pre-set time interval, stimulating the advent of the next ELM. While the mean ELM period is observed to depend only on the mean power applied, ELM pacing is shown to significantly regularize the ELM period with respect to the case of continuously applied power. It is also shown that the ELM period can be changed from one ELM to the next on time scales shorter than the global energy confinement time. These results present a challenging benchmark to physics-based pedestal models and can point towards obtaining a deeper understanding of the physics of individual ELM cycles.

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Real-time control of the period of individual ELMs by EC power on TCV

Felici

Rossel²,

Duval³

et al. 2013

Nucl. Fusion

View full text Add to dashboard Cite

show abstract

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On the low-temperature nuclear spin–lattice relaxation in amorphous materials

Cited by 1 publication

References 8 publications

Real-time control of the period of individual ELMs by EC power on TCV

Real-time control of the period of individual ELMs by EC power on TCV

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