The availability of ever stronger,laser-generated electromagnetic fields underpins continuing progress in the study and application of nonlinear phenomena in basic physical systems,ranging from molecules and atoms to ...The availability of ever stronger,laser-generated electromagnetic fields underpins continuing progress in the study and application of nonlinear phenomena in basic physical systems,ranging from molecules and atoms to relativistic plasmas and quantum electrodynamics.This raises the question:how far will we be able to go with future lasers?One exciting prospect is the attainment of field strengths approaching the Schwinger critical field Ecr in the laboratory frame,such that the field invariant E^(2)−c^(2)B^(2)>E_(cr)^(2) is reached.The feasibility of doing so has been questioned,on the basis that cascade generation of dense electron–positron plasma would inevitably lead to absorption or screening of the incident light.Here we discuss the potential for future lasers to overcome such obstacles,by combining the concept of multiple colliding laser pulses with that of frequency upshifting via a tailored laser–plasma interaction.This compresses the electromagnetic field energy into a region of nanometre size and attosecond duration,which increases the field magnitude at fixed power but also suppresses pair cascades.Our results indicate that laser facilities with peak power of tens of PW could be capable of reaching Ecr.Such a scenario opens up prospects for the experimental investigation of phenomena previously considered to occur only in the most extreme environments in the universe.展开更多
Exploiting high-energy electron beams colliding into high-intensity laser pulses brings an opportunity to reach high values of the dimensionless rest-frame acceleration χ and thereby invoke processes described by str...Exploiting high-energy electron beams colliding into high-intensity laser pulses brings an opportunity to reach high values of the dimensionless rest-frame acceleration χ and thereby invoke processes described by strong-field quantum electrodynamics(SFQED).Measuring deviations from the results of Furry-picture perturbation theory in SFQED at high χ can be valuable for testing existing predictions,as well as for guiding further theoretical developments.Nevertheless,such experimental measurements are challenging due to the probabilistic nature of the interaction processes,dominating signals of low-χ interactions and limited capabilities to control and measure the alignment and synchronization in such collision experiments.Here we elaborate a methodology of using approximate Bayesian computations for drawing statistical inferences based on the results of many repeated experiments despite partially unknown collision parameters that vary between experiments.As a proof-of-principle,we consider the problem of inferring the effective mass change due to coupling with the strong-field environment.展开更多
基金This research was supported by the Swedish Research Council Grants Nos.2016-03329 and 2020-06768(T.G.B.and M.M.)2017-05148(A.G.),as well as the U.S.Department of Energy Office of Science Offices of High Energy Physics and Fusion Energy Sciences(through LaserNetUS)+1 种基金under Contract No.DE-AC02-05CH11231(S.S.B.)Simulations were performed on resources provided by the Swedish National Infrastructure for Computing(SNIC).
文摘The availability of ever stronger,laser-generated electromagnetic fields underpins continuing progress in the study and application of nonlinear phenomena in basic physical systems,ranging from molecules and atoms to relativistic plasmas and quantum electrodynamics.This raises the question:how far will we be able to go with future lasers?One exciting prospect is the attainment of field strengths approaching the Schwinger critical field Ecr in the laboratory frame,such that the field invariant E^(2)−c^(2)B^(2)>E_(cr)^(2) is reached.The feasibility of doing so has been questioned,on the basis that cascade generation of dense electron–positron plasma would inevitably lead to absorption or screening of the incident light.Here we discuss the potential for future lasers to overcome such obstacles,by combining the concept of multiple colliding laser pulses with that of frequency upshifting via a tailored laser–plasma interaction.This compresses the electromagnetic field energy into a region of nanometre size and attosecond duration,which increases the field magnitude at fixed power but also suppresses pair cascades.Our results indicate that laser facilities with peak power of tens of PW could be capable of reaching Ecr.Such a scenario opens up prospects for the experimental investigation of phenomena previously considered to occur only in the most extreme environments in the universe.
基金support from the Swedish Research Council(Grant No.2017-05148 and No.201902376)provided by the National Academic Infrastructure for Supercomputing in Sweden(NAISS)at Tetralithpartially funded by the Swedish Research Council through grant agreement No.2022-06725
文摘Exploiting high-energy electron beams colliding into high-intensity laser pulses brings an opportunity to reach high values of the dimensionless rest-frame acceleration χ and thereby invoke processes described by strong-field quantum electrodynamics(SFQED).Measuring deviations from the results of Furry-picture perturbation theory in SFQED at high χ can be valuable for testing existing predictions,as well as for guiding further theoretical developments.Nevertheless,such experimental measurements are challenging due to the probabilistic nature of the interaction processes,dominating signals of low-χ interactions and limited capabilities to control and measure the alignment and synchronization in such collision experiments.Here we elaborate a methodology of using approximate Bayesian computations for drawing statistical inferences based on the results of many repeated experiments despite partially unknown collision parameters that vary between experiments.As a proof-of-principle,we consider the problem of inferring the effective mass change due to coupling with the strong-field environment.
