Two-length spatial correlation function of turbulence in TCV

Abstract

Spatial correlation functions of density fluctuations are measured in the Tokamak à Configuration Variable (TCV) using a dual-channel Doppler backscattering (DBS) diagnostic. In certain cases, the spatial correlation function exhibits two characteristic length scales. By analogy with nonlinear reduced simulations, the presence of two correlation lengths may be indicative of avalanche-like transport. The correlation functions obtained from DBS are compared with those from short-pulse reflectometry measurements and show reasonable agreement. Both short- and long-range correlations are measured in the same plasma geometry for different heating powers. Short-scale correlation lengths are found to be on the order of 3-5 Larmor radii, while large-scale correlations extend over approximately 5-15 Larmor radii. The correlations are found to decrease towards the very edge of electron cyclotron heated discharges, coinciding with a narrow Er well.

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BibTeX RIS

BibTeX

@misc{panico2026twolength,
  title = {{Two-length spatial correlation function of turbulence in TCV}},
  author = {Olivier Panico and Pascale Hennequin and Sascha Rienäcker and Oleg Krutkin and Benoit Labit and Yanick Sarazin and the TCV team},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.15125},
  eprint = {2609.15125},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.15125},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Two-length spatial correlation function of turbulence in TCV
AU  - Olivier Panico
AU  - Pascale Hennequin
AU  - Sascha Rienäcker
AU  - Oleg Krutkin
AU  - Benoit Labit
AU  - Yanick Sarazin
AU  - the TCV team
PY  - 2026
DA  - 2026/09/14
PB  - arXiv
DO  - 10.48550/arxiv.2609.15125
UR  - https://arxiv.org/abs/2609.15125
AB  - Spatial correlation functions of density fluctuations are measured in the Tokamak à Configuration Variable (TCV) using a dual-channel Doppler backscattering (DBS) diagnostic. In certain cases, the spatial correlation function exhibits two characteristic length scales. By analogy with nonlinear reduced simulations, the presence of two correlation lengths may be indicative of avalanche-like transport. The correlation functions obtained from DBS are compared with those from short-pulse reflectometry measurements and show reasonable agreement. Both short- and long-range correlations are measured in the same plasma geometry for different heating powers. Short-scale correlation lengths are found to be on the order of 3-5 Larmor radii, while large-scale correlations extend over approximately 5-15 Larmor radii. The correlations are found to decrease towards the very edge of electron cyclotron heated discharges, coinciding with a narrow Er well.
ER  -

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