{"help":"Return the metadata of a dataset (package) and its resources. :param id: the id or name of the dataset :type id: string","success":true,"result":[{"id":"9575959e-54a7-4760-a765-dd9513ed3b87","name":"pattern-formation-hipims-plasmas","title":"Pattern Formation in HiPIMS Plasmas","author_email":"achim.vonkeudell@rub.de","maintainer":"Research Data Repository","maintainer_email":"achim.vonkeudell@rub.de","license_title":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/","notes":"\u003Cp\u003EHigh power impulse magnetron sputtering (HiPIMS) plasmas produce a very energetic growth flux for the synthesis of thin films with superior properties. High power densities in the range of a few kW\/cm2 are applied to a metal target electrode in short pulses with a length of 10 to 400 microseconds and duty cycles of a few percent or less in an argon plasma gas. Fast camera and probe measurements revealed the formation of very characteristic plasma patterns that become visible as rotating localized ionization zones, so called spokes. The appearance of these spokes at high plasma powers is believed to be essential for the good performance of HiPIMS plasmas. The rotation direction of the spokes is in ExB direction at high plasma powers, but in retrograde ExB direction at low plasma powers. This characteristic behavior is explained by applying a simple drift wave model from literature and comparing the dispersion relation of those waves with measured data. The pronounced rotation reversal is explained by either a change in the governing density gradient in the plasma or by the change in the direction of the streaming ions during the transition from an argon dominated regime at low powers to a metal dominated regime at high powers.\u003C\/p\u003E\n","url":"https:\/\/rdpcidat.rub.de\/dataset\/pattern-formation-hipims-plasmas","state":"Active","log_message":"Update to resource Frequency versus wavevector","private":true,"revision_timestamp":"Sun, 03\/21\/2021 - 19:35","metadata_created":"Mon, 12\/30\/2019 - 22:36","metadata_modified":"Sun, 03\/21\/2021 - 19:35","creator_user_id":"97d4ca9e-d6a4-435e-b2fa-290a5ce8358c","type":"Dataset","resources":[{"id":"94f42013-6082-461d-90c2-c0a4c9571c0c","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/SFBTR87_A5_D1_R1_DISPERSION.txt","description":"\u003Cp\u003EFirst column target current over a two inch target. Second column temporal delay in microseconds between maxima of 2 photomultiplier (PMT) signals with a difference of 45 deg in position along the racetrack, third , fourth column delay expressed as frequency and standard deviation, fifth and sixth column delay expressed as velocity of the spokes given the distance between PMT1 and PMT2.\u003C\/p\u003E\n","format":"txt","state":"Active","revision_timestamp":"Sun, 03\/21\/2021 - 19:36","name":"Frequency versus wavevector","mimetype":"text\/plain","size":"4.05 KB","created":"Mon, 12\/30\/2019 - 22:36","resource_group_id":"ec8154f9-454d-4b85-895c-f5e010310847","last_modified":"Date changed  Sun, 03\/21\/2021 - 19:36"}],"tags":[{"id":"50820183-cedf-4e0f-9583-d328abf18ebd","vocabulary_id":"2","name":"HiPIMS"},{"id":"c552fb50-869c-48ed-92b6-c33657520854","vocabulary_id":"2","name":"Spokes"}],"groups":[{"description":"\u003Cp\u003EThe group \u0022Experimental Physics II - Reactive Plasmas\u0022 at the faculty of physics and astronomy at Ruhr University Bochum.\u003C\/p\u003E\n","id":"ec8154f9-454d-4b85-895c-f5e010310847","image_display_url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/rublogoweiss_0.png","title":"EP2","name":"group\/ep2"}]}]}