Practical approach to monochromatic LWFA

Abstract

Abstract. Dependence of the LWFA performance upon the laser wavelength is applied to optimization of the plasma-channeled standard LWFA operating in a linear regime. Electron beam energy spread, emittance and luminosity depend upon the proportion of the electron bunch size to the plasma wavelength. This proportion tends to improve with the laser wavelength increase. We propose the two-stage ~1 GeV LWFA with the controlled energy spread and emittance based on realistic capabilities of the BNL ATF that features: picosecond terawatt CO 2 laser and a high-brightness electron gun.

High quality electron bunch generation with CO2-laser-plasma interaction

“…Nowadays, high-pressure CO 2 laser has approached a Terawatt power [15] and has been applied successfully for driving particle acceleration [16][17][18]. The CO 2 laser pulse, with a central wavelength of 10.6 µm, can drive a large-size bubble in low-density plasma, and the bigger bubble volume can accelerate more electrons to high energy before overloading effect occurs.…”

Strong-field physics with mid-infrared lasers

“…[2]), Japan-US collaboration on polarized positron source [3,15], N. Andreev and S. Kuznetsov [13,14]. Special thanks to Optoel Co. [5] for help in developing the ATF C02 laser.…”

Terawatt picosecond CO[sub 2] laser technology for high energy physics applications

“…According to Eq. (13), X-proportional increase in N. allows X2-proportional reduction in J Then, the average laser power calculated from Pm = P~T~f (14) scales as Pm -l/A. For example, to meet the extremely luminosity requirements for the IM.ue e-e+ collider, A= 1035s-lcm-2 [13], the picosecond C02 laser of the 10 kW average power may be required.…”

“…Returning to discussion on the electron monochromaticity attainable with the COZ laser driven LWFA, we address recent simulations for electron bunch acceleration by plasma wake excited in the matched parabolic plasma channel [14]. The following input parameters have been used in simulations: C@ laser with r~=l ps, P~=50 TW, a=O.71; plasma channel parameters &L=3.8, k#c~=14.3, &=800 pm, where~and kp are defined at the axis of the plasma channel that has the profile (( ne(r) = n: 1+ r/R~h)2).…”

“…Simulations [14] revealed a need for fi.uther reduction in~b in order to maintain the electron energy spread below 10Yo.Accordingly, a fmsible monoenergetic LWFA scheme (see Fig.4) includes: the LWFA bunch compressor to 20-15 fs and the energy gain stage. Result of 3D test particle simulations for these stages are shown correspondingly in Fig.5 and 6.…”