A JSON based lattice file format
Project description
LatticeJSON
LatticeJSON is a JSON based lattice file format. JSON is able to describe complex data structures, has a human readable syntax and is available in all common programming language. It is therefore an appropriate choice to characterize the magnetic lattice of a particle accelerator.
Specification
This repository contains the Specification of LatticeJSON in form of a JSON Schema.
Example
A LatticeJSON file for a FODO lattice:
{
"name": "FODO_RING",
"description": "This is the simplest possible strong focusing lattice.",
"elements": {
"D1": ["Drift", {"length": 0.55}],
"Q1": ["Quadrupole", {"length": 0.2, "k1": 1.2}],
"Q2": ["Quadrupole", {"length": 0.4, "k1": -1.2}],
"B1": ["Dipole", {"length": 1.5, "angle": 0.392701, "e1": 0.1963505, "e2": 0.1963505}]
},
"sub_lattices": {
"FODO": ["Q1", "D1", "B1", "D1", "Q2", "D1", "B1", "D1", "Q1"]
},
"lattice": ["FODO", "FODO", "FODO", "FODO", "FODO", "FODO", "FODO", "FODO"]
}
LatticeJSON CLI
This repository also contains a Python based command-line tool which is able validate and convert LatticeJSON files into other common lattice file formats and vice versa.
You can install and update it using pip or pipenv:
pip install -U latticejson
Validate a LatticeJSON file:
latticejson validate /path/to/lattice.json
Convert an elegant lattice file to the LatticeJSON format:
latticejson convert --to json /path/to/lattice.lte
Autoformat one or more LatticeJSON files:
latticejson autoformat /path/to/lattice.json ...
To activate Bash completion add
eval "$(_LATTICEJSON_COMPLETE=source latticejson)"
to your .bashrc
. Or, create an activation script with:
_LATTICEJSON_COMPLETE=source latticejson > latticejson-complete.sh
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