{"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":"ed0c0b96-51e1-4927-aaa8-db3b57318ac9","name":"helium-metastable-species-generation-atmospheric-pressure-rf-plasma-jets-driven-tailored","title":"Helium metastable species generation  in atmospheric pressure RF plasma jets driven by tailored voltage waveforms in mixtures of He and N2","author_email":"korolov@aept.rub.de","maintainer":"Research Data Repository","maintainer_email":"achim.vonkeudell@rub.de","license_title":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/","notes":"\u003Cp\u003ESpatially resolved tunable diode-laser absorption measurements of the absolute densities of He-I (23S1) metastables in a micro atmospheric pressure plasma jet operated in He\/N_2 and driven by \u2018peaks\u2019- and \u2018valleys\u2019-type tailored voltage waveforms are presented. The measurements are performed at different nitrogen admixture concentrations and peak-to-peak voltages with waveforms that consist of up to four consecutive harmonics of the fundamental frequency of 13.56 MHz. Comparisons of the measured metastable densities with those obtained from particle-in-cell\/Monte Carlo collision simulations show a good quantitative agreement. The density of helium metastables is found to be significantly enhanced by increasing the number of consecutive driving harmonics. Their generation can be further optimized by tuning the peak-to-peak voltage amplitude and the concentration of the reactive gas admixture. These findings are understood based on detailed fundamental insights into the spatio-temporal electron dynamics gained from the simulations, which show that voltage waveform tailoring allows to control the electron energy distribution function to optimize the metastable generation. A high degree of correlation between the metastable creation rate and the electron impact excitation rate from the helium ground state into the He-I ((3s)3S1) level is observed for some conditions which may facilitate an estimation of the metastable densities.\u003C\/p\u003E\n","url":"https:\/\/rdpcidat.rub.de\/dataset\/helium-metastable-species-generation-atmospheric-pressure-rf-plasma-jets-driven-tailored","state":"Active","log_message":"Edited by kd.","private":true,"revision_timestamp":"Sun, 03\/21\/2021 - 16:25","metadata_created":"Tue, 09\/15\/2020 - 13:18","metadata_modified":"Sun, 03\/21\/2021 - 16:25","creator_user_id":"79009e3e-aee0-421f-9d06-2cafa8868bbd","type":"Dataset","resources":[{"id":"7b17a507-c6ee-45f1-aa54-550bc8b7469b","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Figure%204.zip","description":"\u003Cp\u003ECaption: The powered electrode is located at x  =  0, while the grounded electrode is at x  =  1 mm. The base frequency is 13.56 MHz and the peak-to-peak value of the driving voltage waveform is kept constant at 500 V. The concentration of the N2 admixture is 0.05%. The columns show data for different numbers of consecutive driving harmonics, N.\u003C\/p\u003E\n\u003Cp\u003EExperimental data are marked as exp\u003Cbr \/\u003E\nSimulation data are marked as sim\u003Cbr \/\u003E\n(Figure4a-4d): x (mm), exp Helium metastable densities (cm-3)\u003Cbr \/\u003E\n(Figure4e-4h): x (mm), sim He metastable densities (cm-3)\u003Cbr \/\u003E\n(Figure4i-4l): x (mm), sim averaged Helium metastable densities (cm-3)\u003Cbr \/\u003E\n(Figure4m-4p): x (mm), sim Source (cm-3 s-1) Singlets and Triplets\u003Cbr \/\u003E\n(Figure4r-4u): x (mm), sim exc. Rate (cm-3 s-1)\u003Cbr \/\u003E\nHarmonics:\u003Cbr \/\u003E\nN = 1: a, e, i, m, r\u003Cbr \/\u003E\nN = 2: b, f, j, n, s\u003Cbr \/\u003E\nN = 3: c, g, k, o, t\u003Cbr \/\u003E\nN = 4: d, h, l, p, u\u003C\/p\u003E\n","format":"zip","state":"Active","revision_timestamp":"Tue, 09\/15\/2020 - 14:29","name":"Figure 4","mimetype":"application\/zip","size":"28.05 KB","created":"Tue, 09\/15\/2020 - 13:20","resource_group_id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","last_modified":"Date changed  Tue, 09\/15\/2020 - 14:29"},{"id":"5f9ae618-014b-41ba-be1d-585b55294353","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Figure%205_0.zip","description":"\u003Cp\u003ENormalized spatio temporal plots of the (singlet  +  triplet) metastable sources (a)\u2013(c) and the electron impact excitation rate from the ground state into the He-I (3s)3S1 level (d)\u2013(f), obtained from PIC\/MCC simulations for different numbers of consecutive harmonics N (columns). The positions of the sheath edges are shown as solid white lines. The base frequency is  =  13.56 MHz, \u03c6pp  =  500 V, and the N2 admixture concentration is 0.05%.\u003Cbr \/\u003E\nExperimental data are marked as exp\u003Cbr \/\u003E\nSimulation data are marked as sim\u003Cbr \/\u003E\nx [t\/TRf] , y[mm]\u003Cbr \/\u003E\n(Figure5a-5c): sim Metastable source [a. u.]\u003Cbr \/\u003E\n(Figure5d-5f): sim Exc. Rate [a. u.]\u003Cbr \/\u003E\n(Figure5a_5d_Sheath to Figure5c_5f_Sheath): sim sheath edges of the plasma. These sheaths are the    same for each corresponding metastable source and Exc. rate\u003C\/p\u003E\n","format":"zip","state":"Active","revision_timestamp":"Tue, 09\/15\/2020 - 14:29","name":"Figure 5","mimetype":"application\/zip","size":"335.01 KB","created":"Tue, 09\/15\/2020 - 14:13","resource_group_id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","last_modified":"Date changed  Tue, 09\/15\/2020 - 14:29"},{"id":"3dd626eb-75a3-469f-9190-b23a791defcc","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Figure%206_0.zip","description":"\u003Cp\u003ESpatially resolved absolute densities of helium 23S1 metastables obtained experimentally for fixed N  =  4 and 0.05% of N_2 admixture concentrations for \u2018peaks\u2019 and \u2018valleys\u2019 waveforms (a). Space- and time-averaged densities of the helium metastables for different numbers of harmonics and N_2 admixture concentrations for \u2018peaks\u2019- waveforms (b). The powered electrode is located at x  =  0, while the grounded electrode is at x  =  1 mm. The base frequency is =  13.56 MHz, \u03c6pp  =  500 V\u003Cbr \/\u003E\nExperimental data are marked as exp\u003Cbr \/\u003E\nSimulation data are marked as sim\u003Cbr \/\u003E\nx[mm]\u003Cbr \/\u003E\n (Figure6a): Exp absolute helium metastable density [cm^{-3}]\u003Cbr \/\u003E\n(Figure6b): Exp and sim space and time averaged densities of helium metastables [cm^{-3}]\u003C\/p\u003E\n","format":"zip","state":"Active","revision_timestamp":"Tue, 09\/15\/2020 - 14:29","name":"Figure 6","mimetype":"application\/zip","size":"1.87 KB","created":"Tue, 09\/15\/2020 - 14:16","resource_group_id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","last_modified":"Date changed  Tue, 09\/15\/2020 - 14:29"},{"id":"c89bcfeb-4bb7-4046-855c-ae0e95fd1712","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Figure%207_0.zip","description":"\u003Cp\u003E(a) Space- and time-averaged helium metastable densities and electron impact excitation rate from the ground state into He-I (3s)3S1 normalized by the respective values at N  =  1 obtained from the PIC simulation as a function of the number of applied consecutive harmonics for two different concentrations of N_2 and \u03c6pp  =  500 V. (b) Ratio of the normalized space- and time-averaged excitation rate and the helium metastable density as a function of N for different combinations of N_2 concentrations and peak-topeak driving voltages (PIC simulation data). The base frequency is f_0  =  13.56 MHz\u003Cbr \/\u003E\nExperimental data are marked as exp\u003Cbr \/\u003E\nSimulation data are marked as sim\u003Cbr \/\u003E\nx[N]\u003Cbr \/\u003E\n(Figure7a): Sim of Space- and time-averaged helium metastable densities and electron impact excitation [Nrom. Exc. Rate n\u003Cem\u003E]\u003Cbr \/\u003E\n(Figure7b): Sim of Ratio of the normalized space- and time-averaged excitation rate and the helium metastable density [Nrom. Exc. Rate \/ n\u003C\/em\u003E]\u003Cbr \/\u003E\n(Figure7b_fit): fit for the normalized space- and time-averaged excitation rate and the helium metastable density [Nrom. Exc. Rate \/ n*]\u003C\/p\u003E\n","format":"zip","state":"Active","revision_timestamp":"Tue, 09\/15\/2020 - 14:29","name":"Figure 7","mimetype":"application\/zip","size":"7.88 KB","created":"Tue, 09\/15\/2020 - 14:17","resource_group_id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","last_modified":"Date changed  Tue, 09\/15\/2020 - 14:29"},{"id":"c7bb21d4-1f7a-4294-9856-0c10aec0220c","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Figure%208_0.zip","description":"\u003Cp\u003EThe powered electrode is located at x  =  0, while the grounded electrode is at x  =  1 mm. The concentration of the N2 admixture is 0.05%. The columns show data for different peak-to-peak values of the driving \u2018peaks\u2019-voltage waveform composed of N  =  4 consecutive harmonics of the base frequency f_0  =  13.56 MHz.\u003Cbr \/\u003E\nExperimental data are marked as exp\u003Cbr \/\u003E\nSimulation data are marked as sim\u003Cbr \/\u003E\nx[mm]\u003Cbr \/\u003E\n(Figure8a-8d): exp Helium metastable densities [cm^{-3}]\u003Cbr \/\u003E\n(Figure8e-8h): sim He metastable densities [cm^{-3}]\u003Cbr \/\u003E\n(Figure8i-8l): sim averaged Helium metastable densities [cm^{-3}]\u003Cbr \/\u003E\n(Figure8m-8p): sim Source [cm^{-3} s^{-1}] Singlets and Triplets\u003Cbr \/\u003E\n(Figure8r-8u): sim exc. Rate [cm^{-3} s^{-1}]\u003Cbr \/\u003E\nPeak-to-peak Voltage:\u003Cbr \/\u003E\n350V: a, e, i, m, r\u003Cbr \/\u003E\n400V: b, f, j, n, s\u003Cbr \/\u003E\n450V: c, g, k, o, t\u003Cbr \/\u003E\n500V: d, h, l, p, u\u003C\/p\u003E\n","format":"zip","state":"Active","revision_timestamp":"Tue, 09\/15\/2020 - 14:29","name":"Figure 8","mimetype":"application\/zip","size":"27.15 KB","created":"Tue, 09\/15\/2020 - 14:20","resource_group_id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","last_modified":"Date changed  Tue, 09\/15\/2020 - 14:29"},{"id":"2a46a08d-1f08-46d3-b370-25339c19515c","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Figure%209.zip","description":"\u003Cp\u003ENormalized spatio temporal plots of the (singlet  +  triplet) metastable source (a)\u2013(c) and the electron impact excitation rate from the ground state into the He-I (3s)3S1 level (d)\u2013(f), obtained from PIC\/MCC simulations for different peak-to-peak voltage amplitudes, \u03c6pp (columns). The positions of the sheath edges are shown as solid white lines. The base frequency is =  13.56 MHz, N  =  4, and the N_2 admixture concentration is 0.05%\u003Cbr \/\u003E\nExperimental data are marked as exp\u003Cbr \/\u003E\nSimulation data are marked as sim\u003Cbr \/\u003E\nx [t\/TRf] , y[mm]\u003Cbr \/\u003E\n (Figure9a-9c): Sim Metastable source [a. u.]\u003Cbr \/\u003E\n(Figure9d-9f): Sim Exc. Rate [a. u.]\u003Cbr \/\u003E\n(Figure9a_9d_Sheath to Figure9c_9f_Sheath): Sim sheath edges of the plasma. These sheaths are the    same for each corresponding metastable source and Exc. rate\u003C\/p\u003E\n","format":"zip","state":"Active","revision_timestamp":"Tue, 09\/15\/2020 - 14:29","name":"Figure 9","mimetype":"application\/zip","size":"223.46 KB","created":"Tue, 09\/15\/2020 - 14:21","resource_group_id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","last_modified":"Date changed  Tue, 09\/15\/2020 - 14:29"},{"id":"234748b0-d955-49e5-b905-ed7644fb99b3","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Figure%2010.zip","description":"\u003Cp\u003E(a) Experimental data for the space- and time-averaged helium metastable density as a function of the peak-to-peak value of the driving voltage waveform. (b) Simulation result for the ratio of the space- and time-averaged electron impact excitation rate from the ground state into the He-I (3s)3S1 level and the space- and time-averaged helium metastable density as a function of the peak to-peak value of the driving voltage waveform, normalized by this ratio at a peak-to-peak voltage of 500 V. The base frequency is f_0  =  13.56 MHz and N = 4\u003Cbr \/\u003E\nExperimental data are marked as exp\u003Cbr \/\u003E\nSimulation data are marked as sim\u003Cbr \/\u003E\n[V]\u003Cbr \/\u003E\n(Figure10a): Sim of Space- and time-averaged helium metastable densities and electron impact excitation [cm^{-3}]\u003Cbr \/\u003E\n(Figure10b): Sim of Ratio of the normalized space- and time-averaged excitation rate and the helium metastable density [Norm. Exc. Rate \/ n\u003Cem\u003E]\u003Cbr \/\u003E\n(Figure10b_fit): fit for the normalized space- and time-averaged excitation rate and the helium metastable density [Norm. Exc. Rate \/ n\u003C\/em\u003E]\u003C\/p\u003E\n","format":"zip","state":"Active","revision_timestamp":"Tue, 09\/15\/2020 - 14:29","name":"Figure 10","mimetype":"application\/zip","size":"8.62 KB","created":"Tue, 09\/15\/2020 - 14:22","resource_group_id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","last_modified":"Date changed  Tue, 09\/15\/2020 - 14:29"},{"id":"1aef8da1-e15c-4847-a68d-008c35976dd1","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Figure%2011.zip","description":"\u003Cp\u003EThe powered electrode is located at x  =  0, while the grounded electrode is at x  =  1 mm. The base frequency is  =  13.56 MHz, the number of consecutive harmonics is kept constant at N  =  4, and \u03c6pp  =  500 V. The columns show data for different values of the nitrogen admixture concentration.\u003Cbr \/\u003E\nExperimental data are marked as exp\u003Cbr \/\u003E\nSimulation data are marked as sim\u003Cbr \/\u003E\nx[mm]\u003Cbr \/\u003E\n(Figure8a-8d): exp Helium metastable densities [cm^{-3}]\u003Cbr \/\u003E\n(Figure8e-8h): sim He metastable densities [cm^{-3}]\u003Cbr \/\u003E\n(Figure8i-8l): sim averaged Helium metastable densities [cm^{-3}]\u003Cbr \/\u003E\n(Figure8m-8p): sim Source [cm^{-3} s^{-1}] Singlets and Triplets\u003Cbr \/\u003E\n(Figure8r-8u): sim exc. Rate [cm^{-3} s^{-1}]\u003Cbr \/\u003E\nNitrogen admixture:\u003Cbr \/\u003E\na, e, i, m, r: 0.05% nitrogen admixture\u003Cbr \/\u003E\nb, f, j, n, s: 0.1% nitrogen admixture\u003Cbr \/\u003E\nc, g, k, o, t: 0.2% nitrogen admixture\u003Cbr \/\u003E\nd, h, l, p, u: 0.4% nitrogen admixture\u003C\/p\u003E\n","format":"zip","state":"Active","revision_timestamp":"Tue, 09\/15\/2020 - 14:29","name":"Figure 11","mimetype":"application\/zip","size":"27.32 KB","created":"Tue, 09\/15\/2020 - 14:25","resource_group_id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","last_modified":"Date changed  Tue, 09\/15\/2020 - 14:29"},{"id":"5e8f72a7-5ef2-45d3-a40a-5b0f68aa1d0b","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Figure%2012.zip","description":"\u003Cp\u003ENormalized spatio-temporal plots of the (singlet  +  triplet) metastable source distribution (a)\u2013(c) and the electron impact excitation rate from the ground state into the He-I (3s)3S1 level (d)\u2013(f), obtained from PIC\/MCC simulations for different N_2 admixture concentrations (columns). The positions of the sheath edges are shown as solid white lines. The base frequency is  =  13.56 MHz, N  =  4, and \u03c6pp  =  500 V.\u003Cbr \/\u003E\nExperimental data are marked as exp\u003Cbr \/\u003E\nSimulation data are marked as sim\u003Cbr \/\u003E\nx [t\/TRf] , y[mm]\u003Cbr \/\u003E\n (Figure12a-12c): Sim Metastable source [a. u.]\u003Cbr \/\u003E\n(Figure12d-12f): Sim Exc. Rate [a. u.]\u003Cbr \/\u003E\n(Figure12a_12d_Sheath to Figure12c_12f_Sheath): Sim sheath edges of the plasma. These sheaths are the same for each corresponding metastable source and Exc. rate\u003C\/p\u003E\n","format":"zip","state":"Active","revision_timestamp":"Tue, 09\/15\/2020 - 14:29","name":"Figure 12","mimetype":"application\/zip","size":"195.46 KB","created":"Tue, 09\/15\/2020 - 14:27","resource_group_id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","last_modified":"Date changed  Tue, 09\/15\/2020 - 14:29"},{"id":"e773ac8a-46f8-4aac-9aef-8079dd464570","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Figure%2013.zip","description":"\u003Cp\u003ESpace- and time-averaged values of the helium metastable density as a function of the nitrogen admixture concentrations obtained experimentally and from the PIC simulations. The base frequency is f_0  =  13.56 MHz, N  =  4, and \u03c6pp = 500 V.\u003Cbr \/\u003E\nExperimental data are marked as exp\u003Cbr \/\u003E\nSimulation data are marked as sim\u003Cbr \/\u003E\nNitrogen concentrateion[%]\u003Cbr \/\u003E\nFigure13a: Sim and exp data for time averaged helium metastable dens [cm^{-3}]\u003Cbr \/\u003E\nFigure13a_fit: sim fit [cm^{-3}]\u003C\/p\u003E\n","format":"zip","state":"Active","revision_timestamp":"Tue, 09\/15\/2020 - 14:29","name":"Figure 13","mimetype":"application\/zip","size":"15.28 KB","created":"Tue, 09\/15\/2020 - 14:28","resource_group_id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","last_modified":"Date changed  Tue, 09\/15\/2020 - 14:29"}],"groups":[{"description":"\u003Cp\u003EThe group \u0022Allgemeine Elektrotechnik und Plasmatechnik\u0022 at the faculty for engineering and information science.\u003C\/p\u003E\n","id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","image_display_url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/AEPT2.png","title":"AEPT","name":"group\/aept"}]}]}