EUROPEAN UNION GOVERNMENT OF ROMANIA Sectoral Operational Programme Increase of Economic Competitiveness Investments for Your Future Structural Instruments 2007-2013 Extreme Light Infrastructure Nuclear Physics (ELI-NP) Phase I Project co-financed by the European Regional Development Fund Experiments with combined laser and gamma beams at ELI-NP Ovidiu Tesileanu for the ELI-NP RA5 Team ovidiu.tesileanu@eli-np.ro Carpathian Summer School of Physics, June 27 th July 8 th, 2016
Laser Driven Experiments TDR1 Laser Driven Nuclear Physics TDR2 High Field QED TDR3 Combined laser gamma experiments RA 5 TDR4 Materials in extreme environments
Physics cases 6 main research topics proposed: Production and photoexcitation of isomers (laser+gamma) Radiation reaction electrons from linac or laser-accelerated Measurement of the e + e - pair production in the tunneling regime Laser-induced vacuum birefringence Sub-eV DM search with 0.1PW and 1 PW E4 The Gamma-Gamma collider @ 1.3-1.4MeV CMS E4 + Common Gamma Polari-Calorimeter (GPC) + Tests of 0.18 and 2.5GeV LPA and the transports 3
RA5 Working Group O. Tesileanu (Leader RA5), K. Seto, L. D Alessi, M. Cuciuc, S. Ataman, M. Rosu, M. Zeng (ELI-NP RA5) Kensuke Homma (TDR Convener, Hiroshima Univ. / IZEST, Japan/France) Yi Xu, I. Dancus, M. Tataru, C. Balan, M. Risca, M. Toma (ELI-NP, other RA s) H. Utsunomiya (Konan Univ., Japan) Y. Nakamiya, S. Sakabe, M. Hashida (Kyoto Univ., Japan) T. Moritaka (ILE Osaka, Japan) A. Ilderton (Chalmers Univ., Sweden) K. Nakajima (IBS, Korea) 4
10PW lasers: Pulse energy = 220J τ = 22 fs I = 1x10 22 W/cm 2 λ = 820 nm Assumed parameter set Electrons: Energy (MeV) 80-720 Bunch charge (pc) 25-400 Bunch length (pm) 100-400 emittance (mm-mrad) 0.2-0.6 Bunch Energy spread (%) 0.04-0.1 Focal spot size (um) >l5 # bunches in the train <32 Bunch separation (nsec) 16 energy variation along the train 0.1 % Energy jitter shot-to-shot 0.1 % Time arrival jitter (psec) < 0.5 Pointing jitter (um) 1. Gamma beam: Energy: 5 20 MeV Bandwidth: 0.5% Spectral density: >10 4 ph/s/ev 5
Experiments: RA5 stages 2018 2019 2020 2021 5
Experimental areas for RA5 6
E7 experimental area
Laboratories
E7: Production and photoexcitation of isomers Important for stellar conditions photon baths with temperatures ranging from 10 8 K (He intershell) to 2-3*10 9 K (deep O-Ne layers of massive stars exploding as SNeII) A 1 X n E, J p S n E g m, E m A X Concept of production and photoexcitation of an isomer 155 Gd with the half-life of 31.97 ms by synchronized irradiations of laser and gamma ray beams at E7 isomers J p E x Half-life 189 Os m 9/2-30.8 kev 5.81 h 180 Ta m 9-75.3 kev > 1.2 x 10 15 y 176 Lu m 1-123 kev 3.66 h 155 Gd m 11/2 121 kev 31.97 ms - 152 Eu m 0-45.6 kev 9.27 y 115 In m 1/2-336 kev 4.49 h 113 Cd m 11/2 226 kev 14.1 y - 85 Kr m 1/2-305 kev 4.48 10 h
E7: Production and photoexcitation of isomers Experimental setup of E7-Stage1 11
RA5-PPEx Initial list of 8 isomers proposed in the TDR extended to >20 Total production cross sections and photoneutron emission cross sections estimated using TALYS Isomer production strategies investigated: laser-accelerated electrons and subsequent bremsstrahlung radiation laser-produced neutrons direct gamma ray production by the interaction of high power laser with a solid or gas target For Day 1 choice is to use electrons accelerated in gas target and the subsequent production of gamma rays in a bremsstrahlung target (most mature technique at this time) Isomer decay cross section as a function of gamma beam energy 12
E4: sub-ev DM search Search for resonance states at very low energies. There are theoretical rationales to expect sub-ev particles. Quasiparallel colliding system(qps) between two incident photons. The signature is produced via the four-wave mixing process, by mixing two-color waves with different frequencies 1ω and in advance at the incidence. From IZEST meeting in Paris, 2014. 13
E7 Stage 1.5 14
E7: RR with 10PW + e-0.6gev Theory of an Electron: Investigation of Running Coupling in Strong Fields - In 1905-1906: nonrelativistic-classical electron model by Lorentz and Abraham - In 1928: Dirac equation in Quantum dynamics - In 1938: relativistic-classical electron model by Dirac - In 2014: Including quantum vacuum (K. Seto, et al., PTEP) + arxiv (2015). (Keita Seto) Simultaneously measure photon energy 100-600 MeV and electron energy 100-300MeV 15
E7: e+e- with 10PW + e-0.6gev Pair Production in Intense Fields: - Collision between radiation from electrons and the peak field in Laser. - The same configuration as Radiation Reaction experiments - Also we can use the same detectors in Radiation Reaction experiments - Radiation from 600MeV electrons including a few O(400MeV) photon/experiment 16
E4 Stage 2: γ-γ collider
E7 Stages 3 & 4 18
E7: e+e- with 10PW + e-2.5gev 19
E7: Laser induced vacuum birefringence with 10PW + lin.pol. g~0.6gev Quantum vacuum characteristics: (Anton Ilderton) - Via photon-photon scattering by the Heisenberg-Euler vacuum model - A few high energy photons O(400MeV-1GeV) by laser acceleration - Laser background photons makes the polarizationflip of high energy photons. =Nonlinear-high intense field QED effects P linear = I - I ^ I + I ^ 20
Related R&D topics Gamma Polari-Calorimeter Detector for detecting energy and polarization of gamma photons up to 1GeV Ultra-high vacuum R&D: test stand under construction at ELI-NP, collaborations with institutes in Romania and Japan Gamma ray flash at 10-20MeV production methods based on high-power ultra-short pulse lasers: employing gaseous/solid targets, directly or with intermediary Bremsstrahlung target Laser-based acceleration of electrons up to 2-5GeV, optimization of parameters tests planned at neighboring 1PW facility Focusing and steering accelerated electron beams in several energy ranges up to 5GeV Simulation of particle trajectories in modified ion pump for ultrahigh vacuum research Simulations of PMQ Halbach arrays for electron beam focusing 21
New detector: Gamma Polari-Calorimeter Common to all E7 subjects: measure charges measure momenta of e+ and e- (energy) measure polarization of incident gamma provide hit timing compact & movable to any positions 22
Human Resources 250 200 Technical Staff (18) Eng. Staff (18) 150 PhD students (50) 100 Jr. researchers (107) 50 Senior researchers (20) 0 2011 2012 2013 2014 2013 2015 2014 2016 2015 2017 2016 2018 2017 2018 2019 Head of Res. Activities (5) 27
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