Plasma based helical undulator for controlled emission of circularly and elliptically polarised betatron radiation2017-08-04T11:52:57+01:00urn:syndication:8fd3c31ccf6140fc91b3cf722f65bf43https://www.laserlab-europe.eu/logo.pnghttps://www.laserlab-europe.eu/favicon.icoplone