Improvement of electron beam quality in optical injection schemes using negative plasma density gradients

Abstract

References (22)

Citing Articles

Download: PDF (514 kB) or Buy this Article (US$25) (Use Article Pack)

G. Fubiani, E. Esarey, C. B. Schroeder, and W. P. Leemans
Ernest Orlando Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA

Received 27 July 2005; published 6 February 2006

Enhancedelectron trapping using plasma density down-ramps as a method forimproving the performance of laser injection schemes is proposed andanalyzed. A decrease in density implies an increase in plasmawavelength, which can shift a relativistic electron from the defocusingto the focusing region of the accelerating wakefield, and adecrease in wake phase velocity, which lowers the trapping threshold.The specific method of two-pulse colliding pulse injector is examinedin detail using a three-dimensional test particle tracking code. Adensity down-ramp with a change of density on the orderof tens of percent over distances greater than the plasmawavelength leads to an enhancement of charge by two ordersin magnitude or more, up to the limits imposed bybeam loading. The accelerated bunches are ultrashort (fraction of theplasma wavelength—e.g., ~5 fs), high charge (>20 pC at modest injection laserintensity ~10¹⁷ W/cm²), with a relative energy spread of a fewpercent at a mean energy of ~25 MeV, and a normalizedroot-mean-square emittance of the order of 0.5 mm mrad.

URL:	http://link.aps.org/doi/10.1103/PhysRevE.73.026402
DOI:	10.1103/PhysRevE.73.026402
PACS:	52.38.Kd 52.38.Kd Laser–plasma acceleration of electrons and ions YEAR: 2006
KEYWORDS:	plasma density, plasma-beam interactions, plasma interactions, relativistic electron beams

REFERENCES (22)

View in Separate Window/Tab

For access to fully linked references, you need to log in. For access to fully linked references, you need to Log in.

K.-C. Tzeng, W. B. Mori, and T. Katsouleas, Phys. Rev. Lett. 79, 5258 (1997).
E. Esarey, B. Hafizi, R. Hubbard, and A. Ting, Phys. Rev. Lett. 80, 5552 (1998).
F. S. Tsung, R. Narang, W. B. Mori, C. Joshi, R. A. Fonseca, and L. O. Silva, Phys. Rev. Lett. 93, 185002 (2004).
S. V. Bulanov, F. Pegoraro, A. M. Pukhov, and A. S. Sakharov, Phys. Rev. Lett. 78, 4205 (1997).
S. Bulanov, N. Naumova, F. Pegoraro, and J. Sakai, Phys. Rev. E 58, R5257 (1998).
P. Tomassini, M. Galimberti, A. Giulietti, D. Giulietti, L. A. Gizzi, L. Labate, and F. Pegoraro, Phys. Rev. ST Accel. Beams 6, 121301 (2003).
H. Suk, N. Barov, J. B. Rosenzweig, and E. Esarey, Phys. Rev. Lett. 86, 1011 (2001).
D. Umstadter, J. K. Kim, and E. Dodd, Phys. Rev. Lett. 76, 2073 (1996).
R. G. Hemker, K.-C. Tzeng, W. B. Mori, C. E. Clayton, and T. Katsouleas, Phys. Rev. E 57, 5920 (1998).
J. R. Cary, R. E. Giacone, C. Nieter, and D. L. Bruhwiler, Phys. Plasmas 12, 056704 (2005).
E. Esarey, R. F. Hubbard, W. P. Leemans, A. Ting, and P. Sprangle, Phys. Rev. Lett. 79, 2682 (1997).
C. B. Schroeder, P. B. Lee, J. S. Wurtele, E. Esarey, and W. P. Leemans, Phys. Rev. E 59, 6037 (1999).
G. Fubiani, E. Esarey, C. B. Schroeder, and W. P. Leemans, Phys. Rev. E 70, 016402 (2004).
H. Kotaki, S. Masuda, M. Kando, J. K. Koga, and K. Nakajima, Phys. Plasmas 11, 3296 (2004).
E. Esarey and W. P. Leemans, Phys. Rev. E 59, 1082 (1999).
R. Keinings and M. E. Jones, Phys. Fluids 30, 252 (1987).