Author: Tsung, F.S.
Paper Title Page
WEYD5
Highly Spin-Polarized Multi-GeV Sub-Femtosecond Electron Beams Generated From Single-Species Plasma Photocathodes  
 
  • Z. Nie, C. Joshi, F. Li, K.A. Marsh, D. Matteo, W.B. Mori, N. Nambu, F.S. Tsung, Y.P. Wu, C. Zhang
    UCLA, Los Angeles, California, USA
  • W. An
    BNU, Haidian District Beijing, People’s Republic of China
  • F. Morales, S. Patchkovskii, O. Smirnova
    MBI, Berlin, Germany
 
  Funding: DOE Grant No. DE-SC0010064; DOE through a SciDAC FNAL Subcontract No. 644405; NSF Grants No. 1734315, No. 1806046 and No. 2108970; ONR MURI (4-442521-JC-22891); and NSFC Grant No. 12075030
High-gra­di­ent and high-ef­fi­ciency ac­cel­er­a­tion in plasma-based ac­cel­er­a­tors has been demon­strated, show­ing its po­ten­tial as the build­ing block for a fu­ture col­lider op­er­at­ing at the en­ergy fron­tier of par­ti­cle physics. How­ever, gen­er­at­ing and ac­cel­er­at­ing the re­quired spin-po­lar­ized beams in such a col­lider using plasma-based ac­cel­er­a­tors has been a long-stand­ing chal­lenge. Here we show that the pas­sage of a highly rel­a­tivis­tic, high-cur­rent elec­tron beam through a sin­gle-species (yt­ter­bium) vapor ex­cites a non­lin­ear plasma wake by pri­mar­ily ion­iz­ing the two outer 6s elec­trons. Fur­ther pho­toion­iza­tion of the re­sul­tant Yb2+ ions by a cir­cu­larly po­lar­ized laser in­jects the 4f14 elec­trons into this wake gen­er­at­ing a highly spin-po­lar­ized beam. Com­bin­ing time-de­pen­dent Schro­dinger equa­tion sim­u­la­tions with par­ti­cle-in-cell sim­u­la­tions, we show that a sub-fem­tosec­ond, high-cur­rent (4 kA) elec­tron beam with up to 56% net spin po­lar­iza­tion can be gen­er­ated and ac­cel­er­ated to 15 GeV in just 41 cm. This rel­a­tively sim­ple scheme solves the per­plex­ing prob­lem of pro­duc­ing spin-po­lar­ized rel­a­tivis­tic elec­trons in plasma-based ac­cel­er­a­tors.
 
slides icon Slides WEYD5 [2.323 MB]  
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)