# VINETA helicon discharges – measurement data (`for_publication`)

> **TODO (authors):** paper title, authors, journal, DOI; short description of the experiment, the diagnostics and the measurement conditions. Nothing scientific in this README was filled in automatically.

## Contents

The dataset reproduces the folder `for_publication/` (state of 2026-10-01): **519 files, 149.14 GB** (1 GB = 10⁹ bytes).

| Folder | Sub-folders | Files | GB | Description |
|---|---|---:|---:|---|
| `B_dot/180mm_antenna/` | `1_5-Pa`, `2_0-Pa`, `2_5-Pa`, `3_5-Pa`, `4_5-Pa`, `5_5-Pa`, `6_5-Pa` | 21 | 90.60 | TODO |
| `B_dot/305mm_antenna/` | `1_0-Pa`, `1_5-Pa`, `2_0-Pa`, `2_5-Pa` | 12 | 55.11 | TODO |
| `Langmuir_probe/180mm_antenna/` | `1_5Pa`, `2_0Pa`, `2_5Pa`, `3_5Pa`, `4_5Pa`, `5_5Pa`, `6_5Pa` | 146 | 1.10 | TODO |
| `Langmuir_probe/305mm_antenna/` | `1_0Pa`, `1_5Pa`, `2_0Pa`, `2_5Pa`, `3_5Pa`, `4_5Pa`, `5_0Pa`, `5_5Pa`, `6_5Pa` | 340 | 2.32 | TODO |

The sub-folder names give the pressure, e.g. `1_5-Pa` and `1_5Pa` = 1.5 Pa (TODO: confirm).

File types:

| Extension | Files | GB |
|---|---:|---:|
| `.h5` | 256 | 149.14 |
| `.csv` | 7 | < 0.01 |
| `.json` | 256 | < 0.01 |

`.h5`: HDF5 (e.g. h5py, HDFView); `.csv`: comma-separated text; `.json`: JSON text. TODO: describe the content of each file type.

## How the folder structure is stored on CKAN

CKAN has no folders. The original paths are therefore kept in the resource names, with `__` in place of `/`:

1. `B_dot/`: every file is its own resource (33 resources). Example: `B_dot__180mm_antenna__1_5-Pa__IQ_Demo.csv` is `B_dot/180mm_antenna/1_5-Pa/IQ_Demo.csv`.
2. `Langmuir_probe/`: one uncompressed tar archive per pressure folder (16 archives). Example: `Langmuir_probe__180mm_antenna__3_5Pa.tar` contains `Langmuir_probe/180mm_antenna/3_5Pa/…`. The archives are not compressed because the HDF5 files shrink by only about 3 %.
3. `MANIFEST.sha256` lists the SHA-256 checksum of all 519 original files with their paths relative to `for_publication/` (format of `sha256sum`).
4. `restore.py` rebuilds the folder and checks every file (Python ≥ 3.8, standard library only).

## Restoring the folder

```bash
python3 restore.py for_publication                      # everything, about 149.14 GB
python3 restore.py for_publication --only Langmuir_probe  # only resources whose name contains the text
```

By hand: download the resources, replace `__` by `/` in the file names, unpack the `.tar` files in the target folder (`tar -xf …`), then run `sha256sum -c MANIFEST.sha256` inside the folder.

## Provenance

- Source: folder `VINETA/for_PlaCos/for_publication/` on the file server of the research group (University of Greifswald), state of 2026-10-01.
- Copied with rsync to a staging area on the university HPC system; checksums computed there; uploaded with the CKAN Data Mover (CDM) of the University of Greifswald.
- Not included: operating-system helper files (`.DS_Store`, `._*`, `Thumbs.db`).

## Licence

Licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).

## Citation and contact

TODO (authors): how to cite; contact. Author and maintainer are listed in the dataset metadata.