The electrode configuration under atmospheric pressure air conditions includes two cylindrical electrodes made of pure Cu with a diameter of 4 mm and a length of 12 mm, which are aligned on a common axis one electrode. One electrode is fixed while the other can be moved along the axis by means of a step motor.
\n", "procedure": "The arc ignites with the start of the contact separation. At a very small gap, the current is enforced to flow through tiny metal parts, which leads to their evaporation. The discharge gap is filled with copper metal vapour. With the further increase of the gischarge gap, the surrounding air is mixing with the metal vapour.
\n" }, "medium": { "name": "air-Cu, air, Cu vapour", "properties": "The presence of metal vapour changes significantly the plasma properties due to the low ionization energy of the Cu atoms. The electric conductivity of the plasma medium increases in comparison to pure air.
\n", "procedure": "No specific gas treatment.
\n" }, "target": { "name": "copper, Cu", "properties": "Melting and evaporation.", "procedure": "Heat fluxes to the electrodes from the plasma can lead to melting and evaporation." }, "diagnostics": { "name": "voltage measurement, high-speed imaging, OES, Unified non-equilibrium model", "properties": "The unified non-equilibrium fluid model in one dimension is used to explore the plasma parameters (model description is provided in doi:10.1088/1361-6463/ad9f79). The model solves the equations for conservation of species, energy of electrons and heavy particles (atoms, molecules, ions), the Poison equations for the electric potential, the heat transfer in the electrodes for a current level controlled by an external circuit.
\n", "procedure": "The simulations are performed strating with a discharge burning with a minimum gap length of 30 \u00b5m for a physical time of 11 ms. Then, the separation of the electrodes is followed for further 51 ms and the discharge gap is increased up to 3 mm. The comparision of experimental and modelling data is based on the measured arc voltage. Variations of the discharge radius during the contact opening, the field enhancement factor, and the molar fraction of copper metal vaopur show the sensitivity of the computed arc voltage.
\n" }, "resource": [ { "id": "6d5b89c8-49dd-4772-a561-5306dce4cdd0", "url": "https://www.inptdat.de/system/files/node942_figure1_0.csv", "filetype": "csv", "datatype": "data tabe", "range": "Time of moving up to 62 ms, electric voltage up to 65 V.", "quality": "published" }, { "id": "139fd88d-fcf5-42db-9065-ab2dc9b93fe1", "url": "https://www.inptdat.de/system/files/node942_figure2_0.csv", "filetype": "csv", "datatype": "data tabe", "range": "Time of moving up to 62 ms. Arc voltage up to 60 V. The values of the field enhancement factor of 140, 160, 180, 200 and 220 are used.", "quality": "published" }, { "id": "f207f08d-4d36-490c-a467-696747e38cb1", "url": "https://www.inptdat.de/system/files/node942_figure3.csv", "filetype": "csv", "datatype": "data tabe", "range": "Time of contact moving up to 62 ms. Arc voltage up to 60 V.", "quality": "published" }, { "id": "f5495c63-ebf8-4f34-b51f-3033df3b1df2", "url": "https://www.inptdat.de/system/files/node942_figure4a_0.csv", "filetype": "csv", "datatype": "data table", "range": "The distance to the cathode corresponds to the respective gap lengths, i.e. it varies up to 30\u00b5m, 300\u00b5m, 600\u00b5m, 90\u00b5m, 1.2mm, 1.5mm, 1.8.mm, 2.1mm, 2.4mm, 2.7mm, and 3mm.\r\nDistance zero correspond to the position of the gounded cathode.", "quality": "published" }, { "id": "4c8758c8-d4e9-48a9-a586-acc1e2a23617", "url": "https://www.inptdat.de/system/files/node942_figure4b_1.csv", "filetype": "csv", "datatype": "data table", "range": "The distance to the cathode corresponds to the respective gap lengths, i.e. it varies up to 30\u00b5m, 300\u00b5m, 600\u00b5m, 90\u00b5m, 1.2mm, 1.5mm, 1.8.mm, 2.1mm, 2.4mm, 2.7mm, and 3mm.\r\nThe electron temperature reaches values close to 11000 K in the plasma bulk.", "quality": "published" }, { "id": "767ce870-0892-4bc1-a7cc-bae56cd90c29", "url": "https://www.inptdat.de/system/files/node942_figure4b_2.csv", "filetype": "csv", "datatype": "data table", "range": "The distance to the cathode corresponds to the respective gap lengths, i.e. it varies up to 30\u00b5m, 300\u00b5m, 600\u00b5m, 90\u00b5m, 1.2mm, 1.5mm, 1.8.mm, 2.1mm, 2.4mm, 2.7mm, and 3mm.\r\nThe gas temperature reaches values of slightly above 5000 K in the plasma bulk.", "quality": "published" }, { "id": "6f803e36-3f64-40e3-8cb7-64f14e5fde8d", "url": "https://www.inptdat.de/system/files/node942_figure5a.csv", "filetype": "csv", "datatype": "data table", "range": "The max molar fraction is 1. ", "quality": "published" }, { "id": "1c6871aa-5472-4708-82ef-72d9c8fcdbcc", "url": "https://www.inptdat.de/system/files/node942_figure5b.csv", "filetype": "csv", "datatype": "data table", "range": "Number densities of over 2e22 m^-3 are reached in the quasineutral plasma bulk.", "quality": "published" } ] } }