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Subject: ELFT HÍRADÓ
- From: <vera.horvath AT eli-alps.hu>
- To: fizinfo AT lists.kfki.hu
- Subject: [Fizinfo] Meghívó az ELI-ALPS szemináriumára
Előadó: Varró Sándor (MTA Wigner Fizikai Kutatóközpont, ELI-ALPS)
Cím: Klein-Gordon radio and laser acceleration of particles
Időpont: 2019. május 3., 10 óra
Helyszín: ELI-ALPS konferenciaterme; Szeged, Wolfgang Sandner utca 3.
Az előadás kivonata:
In the present talk, first we show that the four potential of electromagnetic
fields in a plasma medium can be considered as a massive vector boson field,
where the mass is proportional with the plasma frequency. Similar vector
fields has long been known in quantum electrodynamics from the works of
Lánczos  and Proca , but these do not rely on plasma considerations. The
„mass-generation mechanism” has been described by Anderson  in solid state
physics, and the research in particle physics on this subject has recently
culminated in the detection of the Higgs particle .
The plane waves of the »Lánczos-Proca fields« have three orthogonal
polarizatons, whose amplitudes satisfy the Klein-Gordon equation. The
expression „Klein-Gordon radio” in the title of the present talk has been
borrowed from the paper by Crandall and Wheeler , devoted to the study of a
dynamical bound on photon mass. These authors presented the peculiarities of
wave propagation in free space, such as the appearance of wake-fields and the
special Doppler effect of radio signals from a rapidly receding massy-photon
transmitter. We show that similar phenomena are also relevant in the so-called
laser wake-field accelerators and in the generation of high harmonics (and
attosecond pulses) by relativistic electrons, interacting with extremely high
intensity laser fields in a plasma environment. On the basis of recently found
new exact solutions of the relativistic wave equations of charged particles
, we also show that very high contrast density modulations are generated,
serving as »quantum bubbles« to accelerate electrons . In the last part of
the talk we consider exact analytic solutions of the relativistic equation of
motion of a point electron interacting with a high-intensity laser field in
vacuum  and in a plasma medium, and compare the particle dynamics (laser
acceleration) and the radiation properties (attosecond light pulse generation)
in these two cases.
 Lánczos C, Die tensoranalytischen Beziehungen der Diracschen Gleichung. Z.
für Physik 57, 447 (1929).
 Proca A, Sur la théorie ondulatoire des électrons positifs et négatifs. J.
Phys. Radium 7, 347-353 (1936).
 Anderson P W, Plasmons, gauge invariance, and mass. Phys. Rev. 130, 439-
 Higgs P W, Evading the Goldstone theorem. Ann. Phys. (Berlin) 526, 211-213
(2014). [Nobel Lecture, 8 December 2013.]
 Crandall R E, Wheeler N A, Klein-Gordon radio and the problem of photon
mass. Nuovo Cim. 80B, 231-242 (1984).
 Varró S, New exact solutions of the Klein-Gordon and Dirac equations of a
charged particle propagating in a strong laser field in an underdense plasma.
Nucl. Instr. and Methods in Phys. Research A 740, 280-283 (2014).
 Varró S, Quantum description of relativistic charged particles interacting
with a strong laser field in a plasma, represented by Lanczos-Proca vector
bosons. Talk presented at EUCALL Joint Foresight Topical Workshop: Theory and
Simulation of Photon-Matter Interactions [ELI-ALPS, 1-6 July 2018, Szeged,
 Hack Sz, Varró S and Czirják A, Carrier-envelope phase controlled isolated
attosecond pulses in the nm wavelength range, based on coherent nonlinear
Thomson backscattering. New J. Phys. 20, 073043 (2018).
A szeminárium angol nyelvű. Minden érdeklődőt szívesen látunk.
- [Fizinfo] Meghívó az ELI-ALPS szemináriumára, vera.horvath, 04/29/2019
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