Aanesland, AneCharles, ChristineBoswell, RoderickFredriksen, A2015-12-130963-0252http://hdl.handle.net/1885/87115A plasma source excited by a double saddle helicon antenna outside the glass vacuum vessel has been modified by inserting a second copper antenna in contact with the plasma through the glass end plate. Both have the same frequency of 13.56 MHz but have aKeywords: Antennas; Copper; Electrons; Glass; Ion bombardment; Plasma density; Plasmas; Sputtering; Temperature; Vacuum; Glass vacuum vessel; Helicon plasma; Saddle helicon antenna; Plasma sources200310.1088/0963-0252/12/1/3112024-03-10