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Minimizing betatron coupling of energy spread and divergence in laser-wakefield accelerated electron beams

Köhler, A.; Pausch, R.; Couperus Cabadağ, J. P.; Zarini, O.; Krämer, J. M.; Bussmann, M.; Debus, A.; Schramm, U.; Irman, A.


Matched beam loading in laser wakefield acceleration (LWFA), characterizing the state of flattening of the accelerating electric field along the bunch, leads to the minimization of energy spread at high bunch charges. Here, we demonstrate by independently controlling injected charge and accelerating gradients, using the self-truncated ionization injection scheme, that minimal energy spread coincides with a reduction of the normalized beam divergence. With the simultaneous confirmation of a constant beam radius at the plasma exit, deduced from betatron radiation spectroscopy, we attribute this effect to the reduction of chromatic betatron decoherence. Thus, beam loaded LWFA enables highest longitudinal and transverse phase space densities.

Keywords: Laser wakefield acceleration; laser plasma accelerator; high bunch charge; beam loading; bunch size measurement; betatron radiation; betatron spectroscopy; Transverse phase space dynamic; beam divergence; beam decoherence; betatron phase mixing; betatron decoherence

Involved research facilities

Related publications

  • Lecture (Conference)
    4th European Advanced Accelerator Concepts Workshop, 15.-21.09.2019, Isola d'Elba, Italia
  • Contribution to WWW
    arXiv:1905.02240 [physics.acc-ph]:


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