Roland Friedl, Raphael Borkenhagen und Ursel Fantz
Achieving high amplifications in a cw-driven optical cavity relevant for photoneutralization of negative ion beams
Fusion Engineering and Design 219, 115244 (2025)
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A. Heiler, Nikolas Klose, Roland Friedl, Ursel Fantz und D. Vlachos
Generation of ultra-low work function surfaces by caesium and water coadsorption in view of negative hydrogen ion sources
Journal of Vacuum Science & Technology A 43, 033203 (2025)
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A. Heiler, Roland Friedl und Ursel Fantz
Separation of plasma species for investigating the impact of hydrogen plasmas on the work function of caesiated surfaces
Plasma Chemistry and Plasma Processing 45, 1-20 (2025)
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A. Heiler, Roland Friedl und Ursel Fantz
Ultra-low work function of caesiated surfaces and impact of selected gas species
Journal of Instrumentation 19, C01057 (2024)
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Roland Friedl, Caecilia Fröhler-Bachus und Ursel Fantz
A portable diagnostic system for the quantification of VUV fluxes emitted from low-temperature plasmas
Measurement Science and Technology 34, 055501 (2023)
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Adrian Heiler, Roland Friedl und Ursel Fantz
Impact of the photoelectric threshold sensitivity on the work function determination: revealing ultra-low work functions of caesiated surfaces
AIP Advances 12, 035339 (2022)
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M. Q. Tran, P. Agostinetti, G. Aiello, K. Avramidis, B. Baiocchi, M. Barbisan, V. Bobkov, Stefan Briefi, A. Bruschi, R. Chavan, I. Chelis, Ch. Day, R. Delogu, B. Ell, F. Fanale, A. Fassina, Ursel Fantz, H. Faugel, L. Figini, D. Fiorucci, Roland Friedl, Th. Franke, G. Gantenbein, S. Garavaglia, G. Granucci, S. Hanke, J.-P. Hogge, C. Hopf, A. Kostic, S. Illy, Z. Ioannidis, J. Jelonnek, J. Jin, G. Latsas, F. Louche, V. Maquet, R. Maggiora, A. Messiaen, D. Milanesio, A. Mimo, A. Moro, R. Ochoukov, J. Ongena, I. G. Pagonakis, D. Peponis, A. Pimazzoni, R. Ragona, N. Rispoli, T. Ruess, T. Rzesnicki, T. Scherer, P. Spaeh, G. Starnella, D. Strauss, M. Thumm, W. Tierens, I. Tigelis, C. Tsironis, M. Usoltceva, D. Van Eester, F. Veronese, P. Vincenzi, F. Wagner, C. Wu, F. Zeus und W. Zhang
Status and future development of heating and current drive for the EU DEMO
Fusion Engineering and Design 180, 113159 (2022)
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Caecilia Fröhler-Bachus, Roland Friedl, Stefan Briefi und Ursel Fantz
Absolute radiometric calibration of a VUV spectrometer in the wavelength range 46-300 nm
Journal of Quantitative Spectroscopy & Radiative Transfer (JQSRT) 259, 107427 (2021)
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Sofia Cristofaro, Roland Friedl und Ursel Fantz
Negative hydrogen and deuterium ion density in a low pressure plasma in front of a converter surface at different work functions
Plasma 4, 94-107 (2021)
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Roland Friedl, Ursel Fantz, Isabel Pilottek, Daniel Schmid und Saskia Steibel
Spatio-temporal structure and emission of a large plasmoid in atmosphere
Journal of Physics D: Applied Physics 54, 095205 (2021)
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Frederik Merk, Roland Friedl, Stefan Briefi, Caecilia Fröhler-Bachus und Ursel Fantz
The role of photon self-absorption on the H (n= 2) density determination by means of VUV emission spectroscopy and TDLAS in low pressure plasmas
Plasma Sources Science and Technology 30, 065013 (2021)
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Adrian Heiler, Roland Friedl, Ursel Fantz, Riccardo Nocentini und M. Sasao
Work function behavior of a biased C12A7 electride in low temperature hydrogen plasmas
AIP Conference Proceedings 2373, 020004 (2021)
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Seventh International Symposium on Negative Ions, Beams and Sources (NIBS 2020), 1–10 September 2020, Oxford, United Kingdom

A. Heiler, K. Waetzig, M. Tajmar, Roland Friedl, R. Nocentini und Ursel Fantz
Work function performance of a C12A7 electride surface exposed to low pressure low temperature hydrogen plasmas
Journal of Vacuum Science & Technology A 39, 013002 (2021)
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A. Heiler, Roland Friedl und Ursel Fantz
Application of a Langmuir probe AC technique for reliable access to the low energy range of electron energy distribution functions in low pressure plasmas
Journal of Applied Physics 127, 113302 (2020)
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Sofia Cristofaro, Roland Friedl und Ursel Fantz
Correlation of Cs flux and work function of a converter surface during long plasma exposure for negative ion sources in view of ITER
Plasma Research Express 2, 035009 (2020)
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Roland Friedl, David Rauner, A. Heiler und Ursel Fantz
Dissociative recombination and its impact on the line profile of the hydrogen Balmer series
Plasma Sources Science and Technology 29, 015014 (2020)
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Sofia Cristofaro, Roland Friedl und Ursel Fantz
Effect of a low pressure low temperature hydrogen plasma on the work function of europium
Journal of Vacuum Science & Technology A 38, 063002 (2020)
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Roland Friedl, F. Merk, C. Hopf und Ursel Fantz
Laboratory experiment for the development of a laser neutralizer in view of DEMO NNBI
AIP conference proceedings , 060006 (2018)
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Ursel Fantz, C. Hopf, Roland Friedl, Sofia Cristofaro, B. Heinemann, Stiliyan Lishev und A. Mimo
Technology developments for a beam source of an NNBI system for DEMO
Fusion Engineering and Design 136, 340-344 (2018)
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Roland Friedl, Sofia Cristofaro und Ursel Fantz
Work function of Cs-free materials for enhanced H− surface production
AIP Conference Proceedings , 050009 (2018)
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Roland Friedl, Uwe Kurutz und Ursel Fantz
Efficiency of Cs-free materials for negative ion production in H2 and D2 plasmas
AIP Conference Proceedings 1869, 030022 (2017)
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Roland Friedl und Ursel Fantz
Influence of H2 and D2 plasmas on the work function of caesiated materials
Journal of Applied Physics 122, 083304 (2017)
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Uwe Kurutz, Roland Friedl und Ursel Fantz
Investigations on Cs-free alternatives for negative ion formation in a low pressure hydrogen discharge at ion source relevant parameters
Plasma Physics and Controlled Fusion 59, 075008 (2017)
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Ursel Fantz, Stefan Briefi, Roland Friedl, C. Fröhler, David Rauner und Dirk Wünderlich
Quantification of UV/VUV photon fluxes of hydrogen plasmas by spectroscopy and by collisional radiative modelling
in: 33rd International Conference on Phenomena in Ionized Gases (ICPIG), 9-14 July 2017, Estoril/Lisbon, Portugal, (2017)
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Sofia Cristofaro, Roland Friedl und Ursel Fantz
Simultaneous measurements of work function and H‒ density including caesiation of a converter surface
AIP Conference Proceedings 1869, 030036 (2017)
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Ursel Fantz, C. Hopf, Dirk Wünderlich, Roland Friedl, M. Fröschle, B. Heinemann, W. Kraus, Uwe Kurutz, R. Riedl, R. Nocentini und L. Schiesko
Towards powerful negative ion beams at the test facility ELISE for the ITER and DEMO NBI systems
Nuclear Fusion 57, 116007 (2017)
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Roland Friedl
Enhancing the accuracy of the Fowler method for monitoring non-constant work functions
Review of Scientific Instruments 87, 043901 (2016)
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Dirk Wünderlich, Christian Wimmer und Roland Friedl
A collisional radiative model for caesium and its application to an RF source for negative hydrogen ions
AIP Conference Proceedings 1655, 020006 (2015)
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Ursel Fantz, Roland Friedl und Stefan Briefi
Correlation of size, velocity, and autonomous phase of a plasmoid in atmosphere with the dissipated energy
Journal of Applied Physics 117, 173301 (2015)
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Roland Friedl und Ursel Fantz
Temperature dependence of the work function of caesiated materials under ion source conditions
AIP Conference Proceedings 1655, 020004 (2015)
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Dirk Wünderlich, Christian Wimmer und Roland Friedl
A collisional radiative model for low-pressure hydrogen–caesium plasmas and its application to an RF source for negative hydrogen ions
Journal of Quantitative Spectroscopy and Radiative Transfer 149, 360-371 (2014)
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Roland Friedl und Ursel Fantz
Fundamental studies on the Cs dynamics under ion source conditions
Review of Scientific Instruments 85, 02B109 (2014)
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Ursel Fantz, Stefan Briefi, Roland Friedl, Martin Kammerloher, Johannes Kolbinger und Alexander Oswald
Initial phase of a large atmospheric plasmoid generated above a water surface
IEEE Transactions on Plasma Science 42, 2624-2625 (2014)
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Roland Friedl
Experimental investigations on the caesium dynamics in H2/D2 low temperature plasmas
Dissertation, Universität Augsburg (2013)
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Ursel Fantz, S. Kalafat, Roland Friedl und Stefan Briefi
Generation of an atmospheric plasmoid from a water discharge: an analysis of the dissipated energy
Journal of Applied Physics 114, 043302 (2013)
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Roland Friedl und Ursel Fantz
Influence of cesium on the plasma parameters in front of the plasma grid in sources for negative hydrogen ions
AIP Conference Proceedings 1515, 255 (2013)
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M. P. Stockli, D. Faircloth, W. Kraus, A. Ando, D. S. Bollinger, Stefan Briefi, Ursel Fantz, Roland Friedl, M. Kashiwagi, D. King, H. Koivisto, B. X. Han, J. Lettry, Y. Takeiri, O. Tarvainen, K. Tsumori, R. F. Welton und Christian Wimmer
Workshop on performance variations in H− ion sources 2012: PV H−12
AIP Conference Proceedings 1515, 594 (2013)
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Ursel Fantz, Roland Friedl und M. Fröschle
Controllable evaporation of cesium from a dispenser oven
Review of Scientific Instruments 83, 123305 (2012)
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Roland Friedl und Ursel Fantz
Spectral intensity of the N-2 emission in argon low-pressure arc discharges for lighting purposes
New Journal of Physics 14, 043016 (2012)
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D. Ertle, Roland Friedl, F. Vogel und Ursel Fantz
Experimental investigation and modelling of the spectral intensity of the N2-emission in argon low-pressure arc discharges
in: Proceedings of the 30th International Conference on Phenomena in Ionized Gases (ICPIG), 29 August - 2 September 2011, Belfast, Northern Ireland, (2011)
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Ursel Fantz, Roland Friedl, Holger Hein, Achim Hilscher und Patrick Starke
Low-pressure discharge lamp
in: , (World Intellectual Property Organization: Geneva, 2011)
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Ursel Fantz, Stefan Briefi, Roland Friedl, M. Kammerloher, A. Oswald und David Rauner
Relaunch of the water plasmoid experiment for investigations of ball lightning phenomena
in: Proceedings of the 30th International Conference on Phenomena in Ionized Gases (ICPIG), 29 August - 2 September 2011, Belfast, Northern Ireland, (2011)
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Ursel Fantz, Stefan Briefi und Roland Friedl
Modelling the radiation of diatomic molecules in low pressure discharges
in: 12th International Symposium on the Science and Technology of Light Sources and the 3rd White LED Conference (LS-WLED 2010), Eindhoven, The Netherlands, 11-16 July 2010, hrsg. von M. Haverlag, G. M. W. Kroesen und T. Taguchi, 159-160 (Foundation for the Advancement of the Science & Technology of Light Sources (FAST-LS): Sheffield, 2010)
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Roland Friedl, Ursel Fantz und F. Vogel
Spectral intensity or the NЇ emission in rare gas low-pressure arc discharges
in: LS-WLED 2010: proceedings of the 12th International Symposium on the Science and Technology of Light Sources and the 3rd International Conference on White LEDs and Solid State Lighting; July 11-16, 2010, Eindhoven, the Netherlands, hrsg. von M. Haverlag, G. M. W. Kroesen und T. Taguchi, 235-236 (Philips Lighting: Eindhoven, 2010)
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W. Kraus, M. Berger, H.-D. Falter, Ursel Fantz, P. Franzen, M. Fröschle, B. Heinemann, C. Martens, P. McNeely, Roland Friedl, E. Speth und A. Stäbler
Development of RF driven H−/D− sources for ITER
in: 35th EPS Conference on Plasma Physics, June 9-13, 2008, Crete, Greece, (2008)
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