1. Extreme Light Infrastructure in Romania: progress Daniel URSESCU Technical contact point for ELI in Romania INFLPR, Magurele, Romania

2. Design Criteria dual front-end (only one running at a time, 10-15 fs @100 mJ) 3 arms (energy up to 300 J each, before compression) separate room for pump lasers (first floor) high rep. rate experimental area (underground 1) and high energy experimental area (underground 2) extendable experimental area parallel experiments operation

3. First floor: pump lasers Ground floor: 2 x front-end laser and 3 x amplifiers Underground 1 and 2: experimental area Preliminary: ELI Nuclear Building

4. Laser Architecture 2xFRONT END DPSSL-pumped OPCPA FE1: 10-20 mJ BW > 120 nm T CP = 50 ps 0.1-1 kHz C > 10^12 FE2: > 100 mJ BW > 80 nm T CP = 1-2 ns 10-100 Hz C > 10^12 TEST COMPRESSOR AMPLIFIERS Ti:Sapphire pumped by ns Nd:YAG & Nd:Glass lasers A1 + A2 BOOSTERS > 4 J, 10Hz DIAGNOSTICS TARGETS DIAGNOSTICS BW – Spectral bandwidth, C – intensity contrast, T CP - chirped pulse duration, T C – re-compressed pulse duration, Φ – focused laser beam diameter, I Σ – intensity on target Φ = 1-20 μm I Σ = 3 x 10 23 -24 W/cm 2 BEAM TRANSPORT IN VACUUM TARGETS A3 +A4+ A5 POWER AMPLIFIERS >300 J A3 +A4+ A5 POWER AMPLIFIERS >300 J A3 +A4+ A5 POWER AMPLIFIERS >300 J A1 + A2 BOOSTERS > 4 J, 10Hz COMPRESSOR 200 J COMPRESSOR >200 J COMPRESSOR 200 J COMPRESSOR >200 J COMPRESSOR 200 J COMPRESSOR >200 J BEAM TRANSPORT IN VACUUM

5. Ground floor building description Technical rooms 2 x Front ends 3 x Amplification chains Adaptive optics, beam transport and diagnostics

6. First floor building description Technical rooms Pump lasers area Technical infrastructure area

7. Interaction Areas Front end target areas 3 PW high rep. rate target areas High energy target areas High energy compressors Beam delivery

8. Technical issues: laser system final pulse duration (>15fs) Spatial and temporal contrast coherent beam combination

9. Technical issues: experiments White book for experiments at ELI-NP Definition and calculation of the source terms for the experiments in the White Book Design of the target areas (including shielding)

10. Thank you for attention!