def layoutTelescopeListFileName(name, label):
    """
    File name for files required at the RayTracing class.

    Parameters
    ----------
    name: str
        Name of the array.
    label: str
        Instance label.

    Returns
    -------
    str
        File name.
    """
    fileName = "telescope_positions-{}".format(name)
    fileName += "_{}".format(label) if label is not None else ""
    fileName += ".ecsv"
    return fileName