nteraction of high-intensity laser pulses with solid state targets results in generation of intense pulses of secondary particles via electromagnetic interaction : electrons, ions, hard x-rays. The beams of these particles can be used to produce various types of third-generation particles, beyond electromagnetic also other types of fundamental interactions can be involved in this process . As the most interesting tertiary particles could be mentioned positrons, neutron, muons. This paper shall extend our previous analysis of this topic : it discusses selected technical problems of design and realization of applicable sources of these particles and presents some more elaborated proposals for potential meaningful / hopefuly realistic exploitations of this technology.
(1)Tertiary Sources (TS) : First Development Steps. This part of the presentation includes the topics as follows: (11) Pulsed positron sources: Verified solutions of laser-driven positron sources   , development towards applicable facilities. Some unconventional concepts of application of lasers for positron production . Techniques for realization of low/very-low energy positrons. (12) Taylored neutron sources : Neutron sources with demanded space distribution, strongly beamed and isotropic solutions  . Neutron generation with taylored energy distribution. Problem of the direct production of neutrons with very low energy  . (13) Potential muon sources: Proof-of-principle laser experiment on electron / photon driven muon production  . Study of the possibility of effective generation of surface muons. Problems of the production of muons with very low energy.
(2) Fundamental & Applied Physics with TS: This part of the talk presents the themes: (21) Diagnostic potential of TS: Lepton emission as a signature of processes in extreme systems. Passive and active diagnostics using positrons, problems of detection and evaluation. Potential diagnostic applications of muons. Concrete application study: muon tomography. (22) Antilepton gravity studies : Possibility of antimattter gravity research using positronium and muonium  . Lepton / antilepton gravity studiesactive with relativistic particle beams . First-phase practical application : positron production for filling (commertial) particle traps, development base for multiple microtrap systems. (23) Hidden world searching  : Potential laser-based production / detection of selected dark mattter particles - axions, hidden photons  . Search for hidden particles in nuclear decay processes . Potential application output: intense positronium source.
Conclusion: The extensive feasibility study confirms the potential of ELI to contribute to the solution of Grand Challenge Problems of physics. Laser-produced tertiary particles will play important role in this effort.
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Ladislav Drska, "Tertiary particle physics with ELI: from challenge to chance (Conference Presentation)," Proc. SPIE 10241, Research Using Extreme Light: Entering New Frontiers with Petawatt-Class Lasers III, 1024116 (Presented at SPIE Optics + Optoelectronics: April 26, 2017; Published: 29 June 2017); https://doi.org/10.1117/12.2270707.5464857820001.
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