The effects of plasma density and laser energy on the stability of laser produced monoenergetic electron beams are investigated. Fluctuations in the principal beam parameters, namely, electron energy, energy-spread, charge, and pointing, are demonstrated to be minimized at low densities. This improvement in stability is attributed to the reduced time for pulse evolution required before self-injection occurs; i.e., that the pulse is closest to the matched conditions for these densities. It is also observed that electrons are only consistently produced above a density-dependent energy threshold. These observations are consistent with there being a threshold intensity (a03) required for the occurrence of self-injection after accounting for pulse compression.

1.
W. P.
Leemans
,
B.
Nagler
,
A. J.
Gonsalves
 et al,
Nature (London)
2
,
696
(
2006
).
2.
S. P. D.
Mangles
,
C. D.
Murphy
,
Z.
Najmudin
 et al,
Nature (London)
431
,
535
(
2004
).
3.
C. G. R.
Geddes
,
C.
Toth
,
J. v.
Tilborg
 et al,
Nature (London)
431
,
538
(
2004
).
4.
J.
Faure
,
Y.
Glinec
,
A.
Pukhov
 et al,
Nature (London)
431
,
541
(
2004
).
5.
S.
Fritzler
,
E.
Lefebvre
,
V.
Malka
 et al,
Phys. Rev. Lett.
92
,
165006
(
2004
).
6.
S. P. D.
Mangles
,
A. G. R.
Thomas
,
M. C.
Kaluza
 et al,
Phys. Rev. Lett.
96
,
215001
(
2006
).
7.
A. I.
Akhiezer
and
R. V.
Polovin
,
Zh. Eksp. Teor. Fiz.
30
,
915
(
1956
).
8.
A.
Pukhov
and
J.
Meyer-ter Vehn
,
Appl. Phys. B: Lasers Opt.
74
,
355
(
2002
).
9.
A.
Pukhov
,
Z. M.
Sheng
, and
J.
Meyer-ter Vehn
,
Phys. Plasmas
6
,
2847
(
1999
).
10.
A. G. R.
Thomas
,
Z.
Najmudin
,
S. P. D.
Mangles
 et al,
Phys. Rev. Lett.
98
,
095004
(
2007
).
11.
J.
Faure
,
Y.
Glinec
,
J. J.
Santos
 et al,
Phys. Rev. Lett.
95
,
205003
(
2005
).
12.
F. S.
Tsung
,
W.
Lu
,
M.
Tzoufras
 et al,
Phys. Plasmas
13
,
056708
(
2006
).
13.
W.
Lu
,
C.
Huang
,
M.
Zhou
 et al,
Phys. Rev. Lett.
96
,
165002
(
2006
).
14.
S. P. D.
Mangles
,
A. G. R.
Thomas
,
M. C.
Kaluza
 et al,
Plasma Phys. Controlled Fusion
48
,
B83
(
2006
).
You do not currently have access to this content.