Title: Temporal characterization of ultrashort linearly chirped electron bunches generated from a laser wakefield accelerator

Abstract

A new method for diagnosing the temporal characteristics of ultrashort electron bunches with linear energy chirp generated from a laser wakefield accelerator is described. When the ionization-injected bunch interacts with the back of the drive laser, it is deflected and stretched along the direction of the electric field of the laser. Upon exiting the plasma, if the bunch goes through a narrow slit in front of the dipole magnet that disperses the electrons in the plane of the laser polarization, it can form a series of bunchlets that have different energies but are separated by half a laser wavelength. Since only the electrons that are undeflected by the laser go through the slit, the energy spectrum of the bunch is modulated. By analyzing the modulated energy spectrum, the shots where the bunch has a linear energy chirp can be recognized. Consequently, the energy chirp and beam current profile of those bunches can be reconstructed. Lastly, this method is demonstrated through particle-in-cell simulations and experiment.

Authors:

Zhang, C. J.; Hua, J. F.; Wan, Y.; Guo, B.; Pai, C. -H.; Wu, Y. P.; Li, F.; Chu, H. -H.; Gu, Y. Q.; Mori, W. B.; Joshi, C.; Wang, J.; Lu, W.

Publication Date:

Fri Jun 17 00:00:00 EDT 2016

Research Org.:

Univ. of California, Los Angeles, CA (United States)

Sponsoring Org.:

USDOE Office of Science (SC)

OSTI Identifier:

1257668

Alternate Identifier(s):

OSTI ID: 1299131

Grant/Contract Number:  

SC0008491; 2013CBA01501

Resource Type:

Published Article

Journal Name:

Physical Review Accelerators and Beams

Additional Journal Information:

Journal Name: Physical Review Accelerators and Beams Journal Volume: 19 Journal Issue: 6; Journal ID: ISSN 2469-9888

Publisher:

American Physical Society (APS)

Country of Publication:

United States

Language:

English

Subject:

43 PARTICLE ACCELERATORS