Department of Nuclear and Atomic Physics Seminars

Staged Laser wakefield acceleration using two color laser pulses

by Dr. Vishwa Bandhu Pathak (Centre for Relativistic Laser Sciences Institute for Basic Science Daejeon, South Korea)

Thursday, February 14, 2019 from to (Asia/Kolkata)
at TIFR, Mumbai ( AG - 66 )
Plasma based accelerators are compact and table-top unconventional accelerators due to high energy gradients ~100GeV/m that can be sustained in accelerating nonlinear plasma wave-structures. Drivers like a short-intense laser pulse or an ultra-relativistic charged beam can excite these nonlinear plasma waves behind there back, hence these accelerating field structures are also called wakefield. 
The achievable energy and the stability of accelerated electron beams have been the most critical issues in laser wakefield acceleration (LWFA). Since laser propagation, plasma wave formation and electron acceleration are highly nonlinear processes; the LWFA is extremely sensitive to the variations in experimental conditions. We propose an all optical controlled LWFA to enhance the performance of a laser electron accelerator in single as well as dual stage.
We propose an all-optical dual-stage laser wakefield acceleration (LWFA), staged with co-propagating two-color laser pulses in a plasma medium, to enhance the electron bunch energy. After the depletion of the leading fundamental laser pulse that initiates self-injection and sets up the first stage particle acceleration, the subsequent second-harmonic laser pulse takes over the acceleration process and accelerates the electron bunch in the second stage over a significantly longer distance than in the first stage.