BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Development of a LWFA target for fine electron injection control DTSTART:20251114T090000Z DTEND:20251114T110000Z DTSTAMP:20260725T062847Z UID:1d817383-37e9-4cd4-936d-7d358c806c66 SEQUENCE:2 CREATED:20251111T093313Z DESCRIPTION:LinkLaser-plasma accelerators (LPAs) employ intense laser puls es focused into a gas target to drive plasma waves with electric fields st rong enough to accelerate electrons to relativistic energies\, offering ac celerator facilities orders of magnitude more compact than conventional on es. Recent advances have demonstrated high-quality electron beams with up to 8 GeV energy gain [1]\, per- mille-level energy spread [2]\, 10–100 p C charge\, few-femtosecond duration [3]\, sub-milliradian divergence\, and repetition rates on the kilohertz range [4]. However\, reproducibility re mains a major limitation due to shot-to-shot fluctuations arising from las er instabilities\, plasma density variations\, and stochastic injection dy namics\, hindering precision applications such as medical therapy [5] and LPA-driven X-FELs [6]. We present a novel two-chamber gas cell enabling pr ecise\, tunable control of the plasma density profile via independent temp erature regulation\, supporting reproducible\, charge-tunable electron bea m generation through a down-ramp injection scheme. The adjustable cell len gth facilitates energy tuning and compatibility with diverse experimental setups. Computational Fluid Dynamics (CFD) simulations using OpenFOAM [7] confirm the feasibility of the designed density profiles\, while Bayesian optimization applied to particle-in-cell simulations using OSIRIS [8] iden tifies optimal laser–plasma parameters. Experimental assembly and testin g of the gas target\, including the temperature and gas injection control system\, are also reported. LAST-MODIFIED:20251111T093710Z LOCATION:Sala P9 (Piso 2 do Pavilhão de Matemática) do IST/Online URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/development-of-a-lwfa-targ et-for-fine-electron-injection-control/ X-ALT-DESC;FMTTYPE=text/html:

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Laser-plasma accelerators (LPAs) employ intense laser pulses focused int o a gas target to drive plasma waves with electric fields strong enough to accelerate electrons to relativistic energies\, offering accelerator faci lities orders of magnitude more compact than conventional ones. Recent adv ances have demonstrated high-quality electron beams with up to 8 GeV energ y gain [1]\, per- mille-level energy spread [2]\, 10–100 pC charge\, few -femtosecond duration [3]\, sub-milliradian divergence\, and repetition ra tes on the kilohertz range [4].

However\, reproducibility remain s a major limitation due to shot-to-shot fluctuations arising from laser i nstabilities\, plasma density variations\, and stochastic injection dynami cs\, hindering precision applications such as medical therapy [5] and LPA- driven X-FELs [6]. We present a novel two-chamber gas cell enabling precis e\, tunable control of the plasma density profile via independent temperat ure regulation\, supporting reproducible\, charge-tunable electron beam ge neration through a down-ramp injection scheme.

The adjustable ce ll length facilitates energy tuning and compatibility with diverse experim ental setups. Computational Fluid Dynamics (CFD) simulations using OpenFOA M [7] confirm the feasibility of the designed density profiles\, while Bay esian optimization applied to particle-in-cell simulations using OSIRIS [8 ] identifies optimal laser–plasma parameters. Experimental assembly and testing of the gas target\, including the temperature and gas injection co ntrol system\, are also reported.

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