- Data from: Low-frequency oscillations in the magnetic nozzle of a Helicon Plasma Thruster (5 sccm case)

- Authors: Davide Maddaloni, Borja Bayón-Buján, Jaume Navarro-Cavallé, Mario Merino, Filippo Terragni

- Contact email: dmaddalo@ing.uc3m.es

- Date: 2024-09-13

- Version: 1.1.0

- License: This dataset is made available under the Creative Commons Attribution 4.0 International

Abstract

This dataset contains the raw experimental data employed in:

Davide Maddaloni, Borja Bayón-Buján, Jaume Navarro-Cavallé, Mario Merino, Filippo Terragni, "Low-frequency oscillations in the magnetic nozzle of a Helicon Plasma Thruster", Plasma Sources Science and Technology

Which is currently submitted.

The data within this dataset collect only the 5 sccm case due to file size limits. A companion dataset is available at 10.5281/zenodo.13915162, collecting the data for the 10 sccm case.

Dataset description

The experimental data is gathered by means of three distinct floating Langmuir Probes (LPs).

The time-resolved data is provided separately for every spatial position inspected. The data is collected by means of an AC-coupled Yokogawa DLM5058 Mixed Signal Oscilloscope, resolving frequencies up to 50 MHz. The time-averaged I-V curve data obtained by sweeping the LPs is postprocessed according to the routine illustrated in Lobbia et al.

Please refer to the corresponding article for further details regarding the data collection (Section 3).

Data files

The data files are in standard Matlab .mat format. A recent version of Matlab is recommended.

For the time-resolved results, data is subdivided according to the spatial position inspected and the xenon injected mass flow rate. The nomenclature of the files follows the structure "WaveData_[injected mass flow rate]_[axial position]_[angular position]". The file collects the raw waveform data file, labeled "WaveData", and the corresponding time array, labeled "t". For each saptial position within the plume, and for each probe, a total of 3 different waveforms were collected, and each waveform includes 50'000'000 points. The time array also contains 50'000'000 points and is the same for each waveform and/or probe. 

Each WaveData variable is structured in a 3-dimensional matrix, where:

• The first dimension represents the time evolution of the waveform (size 50'000'000)
• The second dimension represents a different waveform (size 3)
• The third dimension represents each a different probe (size 3)
  • Probe 1 along the first position
  • Probe 2 along the second position
  • Probe 3 along the third position

Please refer to the corresponding article for details regarding the probe labeling and their configuration (Section 3).

The time-resolved data is provided in a structure array, containing several fields of two-dimensional matrices with dimensions 21x11 of relevant plasma parameters, as follows:

• n: plasma density (in m^-3)
• Vp: plasma potential (in V)
• Bx: component along X of the magnetic field (in T)
• By: component along Y of the magnetic field (in T)
• X: axial meshgrid coordinate (in mm)
• Y: radial meshgrid coordinate (in mm)

The electron temperature is not included, since it is considered to be constant within the corresponding article. For the 5 sccm case, it corresponds to 12.5 eV.

Citation

Works using this dataset or any part of it in any form shall cite it as follows.

The preferred means of citation is to reference the publication associated to this dataset, as soon as it is available.

Optionally, the dataset may be cited directly by referencing the corresponding DOI: 10.5281/zenodo.13913729.

Acknowledgments

This work has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (project ERC-STG ZARATHUSTRA, grant agreement No 950466). Additionally, F. Terragni was also supported by the FEDER / Ministerio de Ciencia, Innovación y Universidades - Agencia Estatal de Investigación (grant agreement No PID2020-112796RB-C22), while B. Bayón-Buján enjoyed a grant from the Consejería de Educación, Universidades, Ciencia y Portavocía of the Community of Madrid (grant PEJ-2021-AI/TIC-23158).