105 lines
4.7 KiB
JSON
105 lines
4.7 KiB
JSON
{
|
|
"$id": "https://www.istp-cnr.it/gray/schemas/beam",
|
|
"$schema": "https://json-schema.org/draft/2020-12/schema",
|
|
"title": "Gaussian beam",
|
|
"description": "Gaussian beam characterization at the launch point.",
|
|
"type": "object",
|
|
"properties": {
|
|
"cocos": {"$ref": "cocos"},
|
|
"power": {
|
|
"description": "Beam power at launch. Units [MW]",
|
|
"type": "number",
|
|
"minimum": 0
|
|
},
|
|
"freq": {
|
|
"description": "Wave frequency. Units [GHz]",
|
|
"type": "number",
|
|
"exclusiveMinimum": 0
|
|
},
|
|
"polarization": {
|
|
"description": "Beam polarization.\\nIt can be one of the plasma modes, or an arbitrary polarization,\\ncharacterized via the polarization ellipse parameters, that in general\\nwill couple to both OM and XM",
|
|
"type": "object",
|
|
"properties": {
|
|
"mode": {
|
|
"description": "The propagation mode the beam couples to. One of:\\n - `OM`: Ordinary mode\\n - `XM`: eXtraordinary mode\n - `ANY`: arbitrary polarization",
|
|
"enum": ["OM", "XM", "ANY"]
|
|
},
|
|
"ellipse": {"$ref": "#/$defs/polEllipse"}
|
|
}
|
|
},
|
|
"pos": {
|
|
"description": "Point where the beam is defined",
|
|
"$ref": "coordscyl"
|
|
},
|
|
"dir": {
|
|
"description": "Beam direction at launch",
|
|
"type": "object",
|
|
"properties": {
|
|
"cocos": {"$ref": "cocos"},
|
|
"alpha": {
|
|
"description": "Poloidal angle. alpha = atan2(-k_z, -k_R), with k the unit wavevector at launch. Units [deg]",
|
|
"type": "number"
|
|
},
|
|
"beta": {
|
|
"description": "Toroidal angle. beta = asin(k_phi), with k the unit wavevector at launch. Units [deg]",
|
|
"type": "number"
|
|
}
|
|
}
|
|
},
|
|
"shape": {
|
|
"description": "Beam shape at launch",
|
|
"type": "object",
|
|
"properties": {
|
|
"amplitude": {
|
|
"description": "Amplitude ellipse (E-field amplitude 1/e-fold on-axis value)",
|
|
"type": "object",
|
|
"properties": {
|
|
"w": {
|
|
"description": "Semi-axes of the ellipse. Units [m]",
|
|
"type": "array",
|
|
"items": {"type": "number", "exclusiveMinimum": 0},
|
|
"minItems": 2,
|
|
"maxItems": 2
|
|
},
|
|
"phi": {"$ref": "#/$defs/rotAngle"}
|
|
}
|
|
},
|
|
"phase": {
|
|
"description": "Phase ellipse (wavefront curvature)",
|
|
"type": "object",
|
|
"properties": {
|
|
"invR": {
|
|
"description": "Principal curvatures of the phase front. Units [m^-1]",
|
|
"type": "array",
|
|
"items": {"type": "number"},
|
|
"minItems": 2,
|
|
"maxItems": 2
|
|
},
|
|
"phi": {"$ref": "#/$defs/rotAngle"}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
},
|
|
"$defs": {
|
|
"polEllipse": {
|
|
"description": "Angles defining an elliptical polarization",
|
|
"type": "object",
|
|
"properties": {
|
|
"psi": {
|
|
"description": "Polarization ellipse orientation.\\nThe angle is measured counter-clockwise angle from x' to the polarization\\nellipse major axis in a local right-handed Cartesian frame (x',y',z')\\nwith z' parallel to the beam axis direction k, and x' in the horizontal\\nplane of the global frame (i.e., x'.z=0). Units [deg]",
|
|
"type": "number"
|
|
},
|
|
"chi": {
|
|
"description": "Polarization ellipticity.\\n|tan(chi)| = b/a ≤ 1 is the ratio of the polarization ellipse semi-axes\\nsign(chi) = +1 for a right-handed wave (i.e., electric field rotating\\nfrom x' to y' at fixed z') and -1 for a left-handed wave. Units [deg]",
|
|
"type": "number"
|
|
}
|
|
}
|
|
},
|
|
"rotAngle": {
|
|
"description": "Ellipse orientation. The angle is measured counter-clockwise from x' to\\nthe first principal direction, in a local right-handed Cartesian frame\\n(x',y',z') with z' parallel to the beam axis direction k, and x' in the\\nhorizontal plane of the global frame (i.e., x'.z=0). Units [deg]",
|
|
"type": "number"
|
|
}
|
|
}
|
|
}
|