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10 results on '"Banjafar, Mohammadreza"'

1. The importance of temperature-dependent collision frequency in PIC simulation on nanometric density evolution of highly-collisional strongly-coupled dense plasmas

Author

Banjafar, Mohammadreza, Randolph, Lisa, Huang, Lingen, Rahul, S. V., Preston, Thomas R., Yabuuchi, Toshinori, Makita, Mikako, Dover, Nicholas P., Göde, Sebastian, Kon, Akira, Koga, James K., Nishiuchi, Mamiko, Paulus, Michael, Rödel, Christian, Bussmann, Michael, Cowan, Thomas E., Gutt, Christian, Mancuso, Adrian P., Kluge, Thomas, and Nakatsutsumi, Motoaki

Subjects
Physics - Plasma Physics
Abstract

Particle-in-Cell (PIC) method is a powerful plasma simulation tool for investigating high-intensity femtosecond laser-matter interaction. However, its simulation capability at high-density plasmas around the Fermi temperature is considered to be inadequate due, among others, to the necessity of implementing atomic-scale collisions. Here, we performed a one-dimensional with three-velocity space (1D3V) PIC simulation that features the realistic collision frequency around the Fermi temperature and atomic-scale cell size. The results are compared with state-of-the-art experimental results as well as with hydrodynamic simulation. We found that the PIC simulation is capable of simulating the nanoscale dynamics of solid-density plasmas around the Fermi temperature up to $\sim$2~ps driven by a laser pulse at the moderate intensity of $10^{14-15}$~$\mathrm{W/cm^{2}}$, by comparing with the state-of-the-art experimental results. The reliability of the simulation can be further improved in the future by implementing multi-dimensional kinetics and radiation transport.

Published
2024

2. (Sub-)picosecond surface correlations of femtosecond laser excited Al-coated multilayers observed by grazing-incidence x-ray scattering

Author

Randolph, Lisa, Banjafar, Mohammadreza, Yabuuchi, Toshinori, Baehtz, Carsten, Bussmann, Michael, Dover, Nick P., Huang, Lingen, Inubushi, Yuichi, Jakob, Gerhard, Kläui, Mathias, Ksenzov, Dmitriy, Makita, Mikako, Miyanishi, Kohei, Nishiushi, Mamiko, Öztürk, Özgül, Paulus, Michael, Pelka, Alexander, Preston, Thomas R., Schwinkendorf, Jan-Patrick, Sueda, Keiichi, Togashi, Tadashi, Cowan, Thomas E., Kluge, Thomas, Gutt, Christian, and Nakatsutsumi, Motoaki

Subjects
Physics - Plasma Physics, Physics - Optics
Abstract

Femtosecond high-intensity laser pulses at intensities surpassing $10^{14} \,\text{W}/\text{cm}^2$ can generate a diverse range of functional surface nanostructures. Achieving precise control over the production of these functional structures necessitates a thorough understanding of the surface morphology dynamics with nanometer-scale spatial resolution and picosecond-scale temporal resolution. In this study, we show that individual XFEL pulses can elucidate structural changes on surfaces induced by laser-generated plasmas, employing grazing-incidence small-angle x-ray scattering (GISAXS). Using aluminum-coated multilayer samples we can differentiate between ultrafast surface morphology dynamics and subsequent subsurface density dynamics, achieving nanometer-depth sensitivity and subpicosecond temporal resolution. The observed subsurface density dynamics serve to validate advanced simulation models depicting matter under extreme conditions. Our findings promise to unveil novel avenues for laser material nanoprocessing and high-energy-density science., Comment: 11 pages, 5 figures. This is the version of the article before peer review

Published
2024

3. Nanoscale subsurface dynamics of solids upon high-intensity laser irradiation observed by femtosecond grazing-incidence x-ray scattering

Author

Randolph, Lisa, Banjafar, Mohammadreza, Preston, Thomas R., Yabuuchi, Toshinori, Makita, Mikako, Dover, Nicholas P., Rödel, Christian, Göde, Sebastian, Inubushi, Yuichi, Jakob, Gerhard, Kaa, Johannes, Kon, Akira, Koga, James K., Ksenzov, Dmitriy, Matsuoka, Takeshi, Nishiuchi, Mamiko, Paulus, Michael, Schon, Frederic, Sueda, Keiichi, Sentoku, Yasuhiko, Togashi, Tadashi, Vafaee-Khanjani, Mehran, Bussmann, Michael, Cowan, Thomas E., Kläui, Mathias, Fortmann-Grote, Carsten, Huang, Lingen, Mancuso, Adrian P., Kluge, Thomas, Gutt, Christian, and Nakatsutsumi, Motoaki

Subjects
Physics - Plasma Physics, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Observing ultrafast laser-induced structural changes in nanoscale systems is essential for understanding the dynamics of intense light-matter interactions. For laser intensities on the order of $10^{14} \, \rm W/cm^2$, highly-collisional plasmas are generated at and below the surface. Subsequent transport processes such as heat conduction, electron-ion thermalization, surface ablation and resolidification occur at picosecond and nanosecond time scales. Imaging methods, e.g. using x-ray free-electron lasers (XFEL), were hitherto unable to measure the depth-resolved subsurface dynamics of laser-solid interactions with appropriate temporal and spatial resolution. Here we demonstrate picosecond grazing-incidence small-angle x-ray scattering (GISAXS) from laser-produced plasmas using XFEL pulses. Using multi-layer (ML) samples, both the surface ablation and subsurface density dynamics are measured with nanometer depth resolution. Our experimental data challenges the state-of-the-art modeling of matter under extreme conditions and opens new perspectives for laser material processing and high-energy-density science., Comment: 16 pages, 4 figures. This is the version of the article before peer review, as submitted by authors. There is a Supplementary Information file in the Ancillary files directory

Published
2020

5. Nanoscale subsurface dynamics of solids upon high-intensity femtosecond laser irradiation observed by grazing-incidence x-ray scattering

Author

Randolph, Lisa, primary, Banjafar, Mohammadreza, additional, Preston, Thomas R., additional, Yabuuchi, Toshinori, additional, Makita, Mikako, additional, Dover, Nicholas P., additional, Rödel, Christian, additional, Göde, Sebastian, additional, Inubushi, Yuichi, additional, Jakob, Gerhard, additional, Kaa, Johannes, additional, Kon, Akira, additional, Koga, James K., additional, Ksenzov, Dmitriy, additional, Matsuoka, Takeshi, additional, Nishiuchi, Mamiko, additional, Paulus, Michael, additional, Schon, Frederic, additional, Sueda, Keiichi, additional, Sentoku, Yasuhiko, additional, Togashi, Tadashi, additional, Bussmann, Michael, additional, Cowan, Thomas E., additional, Kläui, Mathias, additional, Fortmann-Grote, Carsten, additional, Huang, Lingen, additional, Mancuso, Adrian P., additional, Kluge, Thomas, additional, Gutt, Christian, additional, and Nakatsutsumi, Motoaki, additional

Published
2022
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6. The High Energy Density Scientific Instrument at the European XFEL

Author

Zastrau, Ulf, primary, Appel, Karen, additional, Baehtz, Carsten, additional, Baehr, Oliver, additional, Batchelor, Lewis, additional, Berghäuser, Andreas, additional, Banjafar, Mohammadreza, additional, Brambrink, Erik, additional, Cerantola, Valerio, additional, Cowan, Thomas E., additional, Damker, Horst, additional, Dietrich, Steffen, additional, Di Dio Cafiso, Samuele, additional, Dreyer, Jörn, additional, Engel, Hans-Olaf, additional, Feldmann, Thomas, additional, Findeisen, Stefan, additional, Foese, Manon, additional, Fulla-Marsa, Daniel, additional, Göde, Sebastian, additional, Hassan, Mohammed, additional, Hauser, Jens, additional, Herrmannsdörfer, Thomas, additional, Höppner, Hauke, additional, Kaa, Johannes, additional, Kaever, Peter, additional, Knöfel, Klaus, additional, Konôpková, Zuzana, additional, Laso García, Alejandro, additional, Liermann, Hanns-Peter, additional, Mainberger, Jona, additional, Makita, Mikako, additional, Martens, Eike-Christian, additional, McBride, Emma E., additional, Möller, Dominik, additional, Nakatsutsumi, Motoaki, additional, Pelka, Alexander, additional, Plueckthun, Christian, additional, Prescher, Clemens, additional, Preston, Thomas R., additional, Röper, Michael, additional, Schmidt, Andreas, additional, Seidel, Wolfgang, additional, Schwinkendorf, Jan-Patrick, additional, Schoelmerich, Markus O., additional, Schramm, Ulrich, additional, Schropp, Andreas, additional, Strohm, Cornelius, additional, Sukharnikov, Konstantin, additional, Talkovski, Peter, additional, Thorpe, Ian, additional, Toncian, Monika, additional, Toncian, Toma, additional, Wollenweber, Lennart, additional, Yamamoto, Shingo, additional, and Tschentscher, Thomas, additional

Published
2021
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7. The High Energy Density Scientific Instrument at the European XFEL

Author

Zastrau, U, Appel, K, Baehtz, C, Baehr, O, Batchelor, L, Berghäuser, A, Banjafar, M, Brambrink, E, Cerantola, V, Cowan, T, Damker, H, Dietrich, S, Di Dio Cafiso, S, Dreyer, J, Engel, H, Feldmann, T, Findeisen, S, Foese, M, Fulla-Marsa, D, Göde, S, Hassan, M, Hauser, J, Herrmannsdörfer, T, Höppner, H, Kaa, J, Kaever, P, Knöfel, K, Konôpková, Z, Laso García, A, Liermann, H, Mainberger, J, Makita, M, Martens, E, Mcbride, E, Möller, D, Nakatsutsumi, M, Pelka, A, Plueckthun, C, Prescher, C, Preston, T, Röper, M, Schmidt, A, Seidel, W, Schwinkendorf, J, Schoelmerich, M, Schramm, U, Schropp, A, Strohm, C, Sukharnikov, K, Talkovski, P, Thorpe, I, Toncian, M, Toncian, T, Wollenweber, L, Yamamoto, S, Tschentscher, T, Zastrau, Ulf, Appel, Karen, Baehtz, Carsten, Baehr, Oliver, Batchelor, Lewis, Berghäuser, Andreas, Banjafar, Mohammadreza, Brambrink, Erik, Cerantola, Valerio, Cowan, Thomas E, Damker, Horst, Dietrich, Steffen, Di Dio Cafiso, Samuele, Dreyer, Jörn, Engel, Hans Olaf, Feldmann, Thomas, Findeisen, Stefan, Foese, Manon, Fulla-Marsa, Daniel, Göde, Sebastian, Hassan, Mohammed, Hauser, Jens, Herrmannsdörfer, Thomas, Höppner, Hauke, Kaa, Johannes, Kaever, Peter, Knöfel, Klaus, Konôpková, Zuzana, Laso García, Alejandro, Liermann, Hanns Peter, Mainberger, Jona, Makita, Mikako, Martens, Eike Christian, McBride, Emma E, Möller, Dominik, Nakatsutsumi, Motoaki, Pelka, Alexander, Plueckthun, Christian, Prescher, Clemens, Preston, Thomas R, Röper, Michael, Schmidt, Andreas, Seidel, Wolfgang, Schwinkendorf, Jan Patrick, Schoelmerich, Markus O, Schramm, Ulrich, Schropp, Andreas, Strohm, Cornelius, Sukharnikov, Konstantin, Talkovski, Peter, Thorpe, Ian, Toncian, Monika, Toncian, Toma, Wollenweber, Lennart, Yamamoto, Shingo, Tschentscher, Thomas, Zastrau, U, Appel, K, Baehtz, C, Baehr, O, Batchelor, L, Berghäuser, A, Banjafar, M, Brambrink, E, Cerantola, V, Cowan, T, Damker, H, Dietrich, S, Di Dio Cafiso, S, Dreyer, J, Engel, H, Feldmann, T, Findeisen, S, Foese, M, Fulla-Marsa, D, Göde, S, Hassan, M, Hauser, J, Herrmannsdörfer, T, Höppner, H, Kaa, J, Kaever, P, Knöfel, K, Konôpková, Z, Laso García, A, Liermann, H, Mainberger, J, Makita, M, Martens, E, Mcbride, E, Möller, D, Nakatsutsumi, M, Pelka, A, Plueckthun, C, Prescher, C, Preston, T, Röper, M, Schmidt, A, Seidel, W, Schwinkendorf, J, Schoelmerich, M, Schramm, U, Schropp, A, Strohm, C, Sukharnikov, K, Talkovski, P, Thorpe, I, Toncian, M, Toncian, T, Wollenweber, L, Yamamoto, S, Tschentscher, T, Zastrau, Ulf, Appel, Karen, Baehtz, Carsten, Baehr, Oliver, Batchelor, Lewis, Berghäuser, Andreas, Banjafar, Mohammadreza, Brambrink, Erik, Cerantola, Valerio, Cowan, Thomas E, Damker, Horst, Dietrich, Steffen, Di Dio Cafiso, Samuele, Dreyer, Jörn, Engel, Hans Olaf, Feldmann, Thomas, Findeisen, Stefan, Foese, Manon, Fulla-Marsa, Daniel, Göde, Sebastian, Hassan, Mohammed, Hauser, Jens, Herrmannsdörfer, Thomas, Höppner, Hauke, Kaa, Johannes, Kaever, Peter, Knöfel, Klaus, Konôpková, Zuzana, Laso García, Alejandro, Liermann, Hanns Peter, Mainberger, Jona, Makita, Mikako, Martens, Eike Christian, McBride, Emma E, Möller, Dominik, Nakatsutsumi, Motoaki, Pelka, Alexander, Plueckthun, Christian, Prescher, Clemens, Preston, Thomas R, Röper, Michael, Schmidt, Andreas, Seidel, Wolfgang, Schwinkendorf, Jan Patrick, Schoelmerich, Markus O, Schramm, Ulrich, Schropp, Andreas, Strohm, Cornelius, Sukharnikov, Konstantin, Talkovski, Peter, Thorpe, Ian, Toncian, Monika, Toncian, Toma, Wollenweber, Lennart, Yamamoto, Shingo, and Tschentscher, Thomas

Abstract

The European XFEL delivers up to 27000 intense (>1012photons) pulses per second, of ultrashort (≤50 fs) and transversely coherent X-ray radiation, at a maximum repetition rate of 4.5MHz. Its unique X-ray beam parameters enable groundbreaking experiments in matter at extreme conditions at the High Energy Density (HED) scientific instrument. The performance of the HED instrument during its first two years of operation, its scientific remit, as well as ongoing installations towards full operation are presented. Scientific goals of HED include the investigation of extreme states of matter created by intense laser pulses, diamond anvil cells, or pulsed magnets, and ultrafast X-ray methods that allow their diagnosis using self-amplified spontaneous emission between 5 and 25keV, coupled with X-ray monochromators and optional seeded beam operation. The HED instrument provides two target chambers, X-ray spectrometers for emission and scattering, X-ray detectors, and a timing tool to correct for residual timing jitter between laser and X-ray pulses.

Published
2021

9. Spatial characterization of FLASH2 pulses: current status and future plan (Conference Presentation)

Author

Mehrjoo, Masoud, primary, Plönjes, Elke, additional, Keitel, Barbara, additional, Kuhlmann, Marion, additional, Ruiz-Lopez, Mabel, additional, Wodzinski, Thomas, additional, Giewekemeyer, Klaus, additional, Vagovic, Patrik, additional, Kim, Yoonhee, additional, Banjafar, Mohammadreza, additional, Messerschmidt, Marc, additional, and Burian, Tomáš, additional

Published
2019
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10. (Sub-)Picosecond Surface Correlations of Femtosecond Laser Excited Al-Coated Multilayers Observed by Grazing-Incidence X-ray Scattering.

Author

Randolph L, Banjafar M, Yabuuchi T, Baehtz C, Bussmann M, Dover NP, Huang L, Inubushi Y, Jakob G, Kläui M, Ksenzov D, Makita M, Miyanishi K, Nishiuchi M, Öztürk Ö, Paulus M, Pelka A, Preston TR, Schwinkendorf JP, Sueda K, Togashi T, Cowan TE, Kluge T, Gutt C, and Nakatsutsumi M

Abstract

Femtosecond high-intensity laser pulses at intensities surpassing 10 14 W/cm 2 can generate a diverse range of functional surface nanostructures. Achieving precise control over the production of these functional structures necessitates a thorough understanding of the surface morphology dynamics with nanometer-scale spatial resolution and picosecond-scale temporal resolution. In this study, we show that single XFEL pulses can elucidate structural changes on surfaces induced by laser-generated plasmas using grazing-incidence small-angle X-ray scattering (GISAXS). Using aluminium-coated multilayer samples we distinguish between sub-picosecond (ps) surface morphology dynamics and subsequent multi-ps subsurface density dynamics with nanometer-depth sensitivity. The observed subsurface density dynamics serve to validate advanced simulation models representing matter under extreme conditions. Our findings promise to open new avenues for laser material-nanoprocessing and high-energy-density science.

Published
2024
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