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# Diagnostic Data Repository README File for Large Helical Device (LHD) Fusion Plasma Experiment 
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# 6 November 2023	First version
# 25 March 2024		Revised with additional info
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# Task Group of Data Analysis Equipoment / Academic Research Platform LHD /
#   National Institute for Fusion Science (NIFS), Japan
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Physics diagnostics data acquired from Large Helical Device (LHD) experiments are available here at LHD's Fusion Diagnostic Data Repository by NIFS. The front page of Open Data Registry on AWS exists at "https://registry.opendata.aws/nifs-lhd/". Any users can search and retrieve the data objects complying with "the rights and terms of use for data."

In this open data repository (https://nifs-lhd.s3.ap-northeast-1.amazonaws.com/index.html), there are two types of archived data format, i.e. ".dat" and ".zip".

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The first generation has the filename structure as

where each shot_number is a 6-digit and each sub-shot_numer is a 3-digit integer padded with leading '0's, like "Bolometer007012-001.dat".
These "dat" archives can be dissolved by "this python3 script" that users can download and use on the local computers.

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The second generation archived files adopts the standard ZIP archive, whose filename is given as

like "Bolometer-90912-1.zip". There is no leading '0' in both shot_number and sub-shot_number, and they could be longer than 6 and 3 digits, respectively.
Those "zip" files can be unzipped by using any "Unzip" utility.

For any inquiries concerning data access, please contact the DAE Task Group at Comp_DAE@nifs.ac.jp.