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Houdellier F, Caruso GM, Weber S, Kociak M, Arbouet A. Development of a high brightness ultrafast Transmission Electron Microscope based on a laser-driven cold field emission source. Ultramicroscopy 2017; 186:128-138. [PMID: 29306810 DOI: 10.1016/j.ultramic.2017.12.015] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 12/18/2017] [Accepted: 12/22/2017] [Indexed: 11/28/2022]
Abstract
We report on the development of an ultrafast Transmission Electron Microscope based on a cold field emission source which can operate in either DC or ultrafast mode. Electron emission from a tungsten nanotip is triggered by femtosecond laser pulses which are tightly focused by optical components integrated inside a cold field emission source close to the cathode. The properties of the electron probe (brightness, angular current density, stability) are quantitatively determined. The measured brightness is the largest reported so far for UTEMs. Examples of imaging, diffraction and spectroscopy using ultrashort electron pulses are given. Finally, the potential of this instrument is illustrated by performing electron holography in the off-axis configuration using ultrashort electron pulses.
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Weber S, Martins R, Martins N. Risk factors for respiratory complications after adenotonsillectomy in OSA children. Sleep Med 2017. [DOI: 10.1016/j.sleep.2017.11.1016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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53
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Varenne O, Aelion H, Bouazza N, Adjedj J, Chaib A, Chenilleau M, Manzo-Silberman S, Degrell P, Jegou A, Allouch P, Salengro E, Weber S, Cariou A. P3666Abnormal coronary vasomotor reactivity is frequent and associated with altered outcomes in patients with symptoms compatible with myocardial ischemia at rest. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p3666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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54
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Eckstein J, Burkardt T, Winterhalder C, Leonardi L, Thommen E, Weber S, Birkemeyer R, Seeck A, Koenig N, Doerr M. P441Use of a smartphone camera to estimate systolic blood pressure compared to standard oscillometric blood pressure measurement - a prospective trial. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx501.p441] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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55
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Ross JS, Higginson DP, Ryutov D, Fiuza F, Hatarik R, Huntington CM, Kalantar DH, Link A, Pollock BB, Remington BA, Rinderknecht HG, Swadling GF, Turnbull DP, Weber S, Wilks S, Froula DH, Rosenberg MJ, Morita T, Sakawa Y, Takabe H, Drake RP, Kuranz C, Gregori G, Meinecke J, Levy MC, Koenig M, Spitkovsky A, Petrasso RD, Li CK, Sio H, Lahmann B, Zylstra AB, Park HS. Transition from Collisional to Collisionless Regimes in Interpenetrating Plasma Flows on the National Ignition Facility. PHYSICAL REVIEW LETTERS 2017; 118:185003. [PMID: 28524679 DOI: 10.1103/physrevlett.118.185003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Indexed: 06/07/2023]
Abstract
A study of the transition from collisional to collisionless plasma flows has been carried out at the National Ignition Facility using high Mach number (M>4) counterstreaming plasmas. In these experiments, CD-CD and CD-CH planar foils separated by 6-10 mm are irradiated with laser energies of 250 kJ per foil, generating ∼1000 km/s plasma flows. Varying the foil separation distance scales the ion density and average bulk velocity and, therefore, the ion-ion Coulomb mean free path, at the interaction region at the midplane. The characteristics of the flow interaction have been inferred from the neutrons and protons generated by deuteron-deuteron interactions and by x-ray emission from the hot, interpenetrating, and interacting plasmas. A localized burst of neutrons and bright x-ray emission near the midpoint of the counterstreaming flows was observed, suggesting strong heating and the initial stages of shock formation. As the separation of the CD-CH foils increases we observe enhanced neutron production compared to particle-in-cell simulations that include Coulomb collisions, but do not include collective collisionless plasma instabilities. The observed plasma heating and enhanced neutron production is consistent with the initial stages of collisionless shock formation, mediated by the Weibel filamentation instability.
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Grogger P, Millesi G, Sacher C, Weber S, Seemann R. Can overall facial attractiveness be estimated by the aesthetic score of its single components? A retrospective data analysis. Int J Oral Maxillofac Surg 2017. [DOI: 10.1016/j.ijom.2017.02.540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Nording F, Weber S, Ludwig F, Schilling M. Measurement system for temperature dependent noise characterization of magnetoresistive sensors. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2017; 88:035006. [PMID: 28372431 DOI: 10.1063/1.4978324] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Magnetoresistive (MR) sensors and sensor systems are used in a large variety of applications in the field of industrial automation, automotive business, aeronautic industries, and instrumentation. Different MR sensor technologies like anisotropic magnetoresistive, giant magnetoresistive, and tunnel magnetoresistive sensors show strongly varying properties in terms of magnetoresistive effect, response to magnetic fields, achievable element miniaturization, manufacturing effort, and signal-to-noise ratio. Very few data have been reported so far on the comparison of noise performance for different sensor models and technologies, especially including the temperature dependence of their characteristics. In this paper, a stand-alone measurement setup is presented that allows a comprehensive characterization of MR sensors including sensitivity and noise over a wide range of temperatures.
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Weber S, Haferlach T, Haferlach C, Kern W. Comprehensive study on ERG gene expression in normal karyotype acute myeloid leukemia: ERG expression is of limited prognostic value, whereas the accumulation of adverse prognostic markers stepwise worsens the prognosis. Blood Cancer J 2016; 6:e507. [PMID: 27935581 PMCID: PMC5223155 DOI: 10.1038/bcj.2016.120] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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59
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Chiaramello M, Amiranoff F, Riconda C, Weber S. Role of Frequency Chirp and Energy Flow Directionality in the Strong Coupling Regime of Brillouin-Based Plasma Amplification. PHYSICAL REVIEW LETTERS 2016; 117:235003. [PMID: 27982651 DOI: 10.1103/physrevlett.117.235003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Indexed: 06/06/2023]
Abstract
A detailed analysis is presented of the various stages of strong coupling Brillouin plasma amplification, emphasizing the importance of the chirp which can be of threefold origin: the intrinsic one driven by the amplification process, the one originating from the chirped-pulse-generated laser pulses, and the one associated with the plasma profile. Control of the overall chirp can optimize or quench the energy transfer. The time-dependent phase relation explains the energy flow direction during amplification and is characteristic for this strong coupling process. The study is also of potential importance to understand and maybe control cross-beam-energy transfer in inertial confinement fusion.
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Kiss SZ, Rostas AM, Heidinger L, Spengler N, Meissner MV, MacKinnon N, Schleicher E, Weber S, Korvink JG. A microwave resonator integrated on a polymer microfluidic chip. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2016; 270:169-175. [PMID: 27497077 DOI: 10.1016/j.jmr.2016.07.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 07/16/2016] [Accepted: 07/18/2016] [Indexed: 06/06/2023]
Abstract
We describe a novel stacked split-ring type microwave (MW) resonator that is integrated into a 10mm by 10mm sized microfluidic chip. A straightforward and scalable batch fabrication process renders the chip suitable for single-use applications. The resonator volume can be conveniently loaded with liquid sample via microfluidic channels patterned into the mid layer of the chip. The proposed MW resonator offers an alternative solution for compact in-field measurements, such as low-field magnetic resonance (MR) experiments requiring convenient sample exchange. A microstrip line was used to inductively couple MWs into the resonator. We characterised the proposed resonator topology by electromagnetic (EM) field simulations, a field perturbation method, as well as by return loss measurements. Electron paramagnetic resonance (EPR) spectra at X-band frequencies were recorded, revealing an electron-spin sensitivity of 3.7·10(11)spins·Hz(-1/2)G(-1) for a single EPR transition. Preliminary time-resolved EPR experiments on light-induced triplet states in pentacene were performed to estimate the MW conversion efficiency of the resonator.
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Teme B, Ardiet N, Cadars B, Trompezinski S, Weber S, Callejon S, Chavagnac-Bonneville M, Jourdan E. 363 Interest of 18-β glycyrrhetinic acid and Ginkgo biloba extract to complement acne therapy. J Invest Dermatol 2016. [DOI: 10.1016/j.jid.2016.06.383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Schröder RJ, Mäurer J, Zlowodski M, Hidajat N, Schlums D, Weber S, Felix R. Vascularization of malignant and benign skin tumours measured by d-galactose-based signal-enhanced colour doppler sonography. Acta Radiol 2016; 42:294-301. [PMID: 11350288 DOI: 10.1080/028418501127346855] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Purpose: Evaluation of colour Doppler criteria to differentiate between malignant and benign skin tumours on the basis of the degree of vascularization. Material and Methods: The B-mode sonomorphology and the degree of vascularization in colour Doppler of 81 clinically potentially malignant tumours of cutaneous and subcutaneous structures were analyzed and quantified by number of intratumoral vessels per sonographic slice and percentage vessel area. Results: Of all criteria employed, counting the intratumoral vessels visible on one ultrasound slice after application of a signal-enhancing agent led to highest sensitivity (94%) of all used criteria but the specificity was poor (64%). The highest specificity (88%) and greatest diagnostic accuracy (86%) discriminating benign and malignant lesions were found using the criterion "percentage vessel area >5.0%" after all inflamed lesions had been excluded on the basis of clinical criteria. Plain colour Doppler increased the specificity up to 97%, although the sensitivity decreased simultaneously to max. 75%. Analysis of the B-mode morphology and spectral Doppler parameter of intratumoral vessels did not contribute to the differential diagnosis. Conclusion: Signal-enhanced colour Doppler sonography is a valuable tool in the pretherapeutic assessment of cutaneous lesions. This method may be relevant for therapy and prognosis.
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Casper M, Linxweiler M, Linxweiler J, Bohner A, Eisele R, Glanemann M, Kim YJ, Weber S, Lammert F. Sec62 Überexpression als molekulares Charakteristikum des HCC – eine Pilotstudie. ZEITSCHRIFT FUR GASTROENTEROLOGIE 2016. [DOI: 10.1055/s-0036-1587087] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Di Giuli M, Haste T, Biehler R, Bosland L, Herranz L, Fontanet J, Beuzet E, Torkhani M, Davidovich N, Klein-Heßling W, Weber S, Dickinson S, Horváth G, Kruse P, Koch M, Paci S, Weber S, Salay M, Bujan A, Ivanov I, Kalychev P, Kim S, Morandi S, Del Corno A, Kotouč M, Dienstbier J, Kim HC. SARNET benchmark on Phébus FPT3 integral experiment on core degradation and fission product behaviour. ANN NUCL ENERGY 2016. [DOI: 10.1016/j.anucene.2016.01.046] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Heilberger P, Schunn C, Ritter W, Weber S, Raithel D. Postoperative Color Flow Duplex Scanning in Aortic Endografting. J Endovasc Ther 2016; 4:262-71. [PMID: 9291051 DOI: 10.1177/152660289700400305] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Purpose: To report the feasibility and sensitivity of duplex sonography compared to computed tomography (CT) for aortic endograft follow-up surveillance. Methods: In a 26-month period, 113 aortic aneurysm patients received 79 tube and 34 bifurcated stent-grafts. Follow-up used contrast-enhanced CT scanning and duplex sonography with an intravenous ultrasound contrast agent (Levovist). Results: Eleven patients (9.7%) were converted to open repair; 1 died from hemorrhagic shock secondary to retroperitoneal hematoma. The mean follow-up time was 7.2 months (range 1 to 24), during which 5 patients died of unrelated causes. Sixteen primary (within 30 days) and 5 secondary endoleaks were detected by duplex after tube graft implantation. Among 5 endoleaks due to retrograde side-branch perfusion, 3 were detected only with contrast-enhanced duplex scanning. Iliac artery occlusion was also documented using duplex; however, 2 stent fractures could not be seen with ultrasound. Ten primary endoleaks were detected in bifurcated stent-graft patients. One endoleak originating from the distal iliac limb anchoring site was missed by duplex owing to bowel gas. Graft limb thrombosis was clearly identified by lack of a flow signal on duplex. Conclusions: Duplex sonography could be a valuable, reliable, and economical surveillance tool for endovascular aortic reconstructions. The adjunctive use of an intravenous ultrasound contrast agent increased the sensitivity for detecting endoleak to a level comparable to contrast-enhanced CT scanning. However, stent fractures may not be seen on ultrasound, and bowel gas can interfere with obtaining an adequate image.
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Wohlfahrt T, Weber S, Englbrecht M, Dees C, Beyer C, Distler O, Schett G, Distler J, Ramming A. SAT0021 Type 2 Innate Lymphoid Cells Are Rapidly and Persistently Recruited in Experimental Fibrosis and Their Counts Correlate with The Severity of Skin and Lung Fibrosis in Systemic Sclerosis. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.3524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Weber S, Haverich A. [Pioneering surgical innovations in Germany : Part 2: public funding and origins of surgical innovations]. Chirurg 2016; 87:433-7. [PMID: 27138267 DOI: 10.1007/s00104-016-0179-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND In recent years research that conforms with evidence-based medicine (EBM) has been demanded even in surgery. Uniform studies were carried out to prove the benefits of new procedures; however, compared to other research sectors, public third party funding for surgical research was significantly cut back. OBJECTIVE Collation of special features in surgery with respect to external funding of surgical top level research. Examination of the benefits of a continuous promotion and of organizations involved in research. MATERIAL AND METHODS Part one of this investigation presented the methods used to identify and analyze pioneering research in surgery. RESULTS Out of a total of 15 revolutionary innovations only 3 projects were financed by external funding and 2 projects received indirect financial support as a result of a cooperation with the medical industry. This demonstrates that the majority of projects were neither directly nor indirectly subsidized. Apart from one instance the majority of innovations were generated by university hospitals highly active in research. DISCUSSION In effect, the non-existing external funding for outstanding surgical innovations and hospitals suggests that a reformation of surgical research is required. To strengthen the quality of innovations in surgery a concentration of funding to institutions that are highly active in research makes sense. Institutional funding directly linked to a project should form a key component of support particularly in the early stages of development.
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Arendt V, Shah R, Weber S, Kuo W, Wang D, Hofmann L. Implementing big data interventional radiology research: lessons learned. J Vasc Interv Radiol 2016. [DOI: 10.1016/j.jvir.2015.12.595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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69
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Dür C, Ansó J, Rohrbach H, Stahl C, Ferrario D, Muntane E, Wyss T, Gerber N, Williamson T, Gavaghan K, Bell B, Weber S, Caversaccio M. ID 310 – Electromyography to protect the facial nerve during minimally invasive cochlear implantation. Clin Neurophysiol 2016. [DOI: 10.1016/j.clinph.2015.11.349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Lancia L, Giribono A, Vassura L, Chiaramello M, Riconda C, Weber S, Castan A, Chatelain A, Frank A, Gangolf T, Quinn MN, Fuchs J, Marquès JR. Signatures of the Self-Similar Regime of Strongly Coupled Stimulated Brillouin Scattering for Efficient Short Laser Pulse Amplification. PHYSICAL REVIEW LETTERS 2016; 116:075001. [PMID: 26943539 DOI: 10.1103/physrevlett.116.075001] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Indexed: 06/05/2023]
Abstract
Plasma-based laser amplification is considered as a possible way to overcome the technological limits of present day laser systems and achieve exawatt laser pulses. Efficient amplification of a picosecond laser pulse by stimulated Brillouin scattering (SBS) of a pump pulse in a plasma requires to reach the self-similar regime of the strongly coupled (SC) SBS. In this Letter, we report on the first observation of the signatures of the transition from linear to self-similar regimes of SC-SBS, so far only predicted by theory and simulations. With a new fully head-on collision geometry, subpicosecond pulses are amplified by a factor of 5 with energy transfers of few tens of mJ. We observe pulse shortening, frequency spectrum broadening, and down-shifting for increasing gain, signatures of SC-SBS amplification entering the self-similar regime. This is also confirmed by the power law dependence of the gain on the amplification length: doubling the interaction length increases the gain by a factor 1.4. Pump backward Raman scattering (BRS) on SC-SBS amplification has been measured for the first time, showing a strong decrease of the BRS amplitude and frequency bandwidth when SBS seed amplification occurs.
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Ovrutskiy S, Rehm K, Weber S, Nordmeyer S, Miera O, Photiadis J, Berger F. Colonization with Multiresistant Gram-Negative (MRGN) Bacteria in Paediatric Cardiovascular Surgery: Is It An Additional Risk Factor for Postoperative Morbidity? Thorac Cardiovasc Surg 2016. [DOI: 10.1055/s-0036-1571932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Gu YJ, Klimo O, Kumar D, Liu Y, Singh SK, Esirkepov TZ, Bulanov SV, Weber S, Korn G. Fast magnetic-field annihilation in the relativistic collisionless regime driven by two ultrashort high-intensity laser pulses. Phys Rev E 2016; 93:013203. [PMID: 26871179 DOI: 10.1103/physreve.93.013203] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Indexed: 11/07/2022]
Abstract
The magnetic quadrupole structure formation during the interaction of two ultrashort high power laser pulses with a collisionless plasma is demonstrated with 2.5-dimensional particle-in-cell simulations. The subsequent expansion of the quadrupole is accompanied by magnetic-field annihilation in the ultrarelativistic regime, when the magnetic field cannot be sustained by the plasma current. This results in a dominant contribution of the displacement current exciting a strong large scale electric field. This field leads to the conversion of magnetic energy into kinetic energy of accelerated electrons inside the thin current sheet.
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Jirka M, Klimo O, Bulanov SV, Esirkepov TZ, Gelfer E, Bulanov SS, Weber S, Korn G. Electron dynamics and γ and e(-)e(+) production by colliding laser pulses. Phys Rev E 2016; 93:023207. [PMID: 26986432 DOI: 10.1103/physreve.93.023207] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Indexed: 06/05/2023]
Abstract
The dynamics of an electron bunch irradiated by two focused colliding super-intense laser pulses and the resulting γ and e(-)e(+) production are studied. Due to attractors of electron dynamics in a standing wave created by colliding pulses the photon emission and pair production, in general, are more efficient with linearly polarized pulses than with circularly polarized ones. The dependence of the key parameters on the laser intensity and wavelength allows us to identify the conditions for the cascade development and γe(-)e(+) plasma creation.
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Huber T, Baumgart J, Peterhans M, Weber S, Heinrich S, Lang H. Die verschwundene Lebermetastase – Neues Einsatzgebiet für die computerassistierte 3D-navigierte laparoskopische Leberesektion? ZEITSCHRIFT FUR GASTROENTEROLOGIE 2016; 54:40-3. [DOI: 10.1055/s-0041-107542] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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75
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Merschin D, Weber S, Peter L, Schüttrumpf JP. [Not Available]. ZEITSCHRIFT FUR ORTHOPADIE UND UNFALLCHIRURGIE 2015; 153:577-8. [PMID: 26670144 DOI: 10.1055/s-0035-1570275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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