Multifunctional focusing device for laser plasma acceleration electron beam sources and application method thereof

Abstract

The invention discloses a multifunctional focusing device for pulse electron beams which are generated based on a new type desktop laser plasma accelerator, wherein the pulse electron beams have femtosecond level pulse width, ultrahigh intensity and a relatively large peak energy jitter range. The device comprises four combination electromagnets with controllable gradients, a time delay controller and a pulse response fluorescent board electron beam imaging system. According to the device, laser plasma electron beam sources can be focused effectively, and moreover, functions such as energy monitoring, orientation monitoring and multi-beam group energy screening are achieved. The device has the advantages of simple operation, convenience, high efficiency and flexible feedback and can be used for effectively diagnosing and controlling electron beam groups in a laser plasma wakefield acceleration electron mechanism. According to the device, the application of the electron beams to a new generation ultrastrong coherent free electron laser light source is greatly promoted.

Description

technical field [0001] The invention relates to an electron accelerator, in particular to a multifunctional focusing device for a laser plasma accelerated electron beam source and a method for using the same. Background technique [0002] A new type of desktop accelerator that accelerates high-energy electron beams based on the plasma wake field generated by laser-plasma interaction has the advantages of miniaturization, short acceleration distance, and high acceleration gradient [see Document 1: O.Lundh, J.Lim , C.Rechatin, L.Ammoura, A.Ben-Ismail, X.Davoine, G.Gallot, J.P.Goddet, E.Lefebvre, V.Malka, and J.Faure, Nat.Phys.7, 219 (2011)], nearly It has developed rapidly over the past few decades, and it has many applications. However, when this new type of electron beam is transmitted in a vacuum tube, if the electron beam is not effectively controlled, the electron beam loses the effect of the lateral focusing force of the laser in the accelerator environment on the plasm...

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Problems solved by technology

[0004] However, for the pulsed electron beams produced by the new desktop laser plasma accelerator with femtosecond pulse width, ultra-high current intensity, and large peak energy jitter range, since the electron beams are all single ultra-short pulses, the response time is short, so it is impossible Continuous beam adjustment, and the peak energy of each electron beam fluctuates, and the vibration between each electron beam is large, which brings great difficulties to the focusing and effective control of the electron beam. The original electromagnet focusing device The feedback adjustment method has no effect on it

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