8
3
3
HFRROLQJ
HOHQV
3
3
HEHDP
%
%
%
&DWKRGH
&ROOHFWRU
3URWRQEHDP
FIGURE 10.39
Electron cooling or electron lens.
advanced beam manipulation, cooling, damping and stability 215
An electron lens 14 is geometrically a very similar device
wherein the proton (or antiproton) beam passes through the
electron beam and receives additional focusing due to the
fields of the electron beam; the lens aims to mitigate variation
of betatron tunes between different bunches of proton beams.
As the main effect of the lens comes from the electric field of
the electron bunch, the direction of the e-beam travel is not
essential (usually, counter-propagating beams are used). The
e-lens concept is shown in the same Fig. 10.39.
We will also mention one more arrangement involving an
electron beam and a magnetic field — the Gabor lens. Suggested 15 in 1947, this technique recently attracted attention 16
in connection to its use for laser plasma ion acceleration, for
energy selection of accelerated protons.
FIGURE 10.40
Conceptual schematic of a Gabor lens.
14 V. Shiltsev et al., PR-ST-AB 2, 071001 (1999).
15 D. Gabor, Nature 160, 89–90 (19 July 1947).
16 J. Pozimski et al., Laser and Particle Beams, v. 31, 04, 2013, pp. 723–733.
3
3
HFRROLQJ
HOHQV
3
3
HEHDP
%
%
%
&DWKRGH
&ROOHFWRU
3URWRQEHDP
FIGURE 10.39
Electron cooling or electron lens.
advanced beam manipulation, cooling, damping and stability 215
An electron lens 14 is geometrically a very similar device
wherein the proton (or antiproton) beam passes through the
electron beam and receives additional focusing due to the
fields of the electron beam; the lens aims to mitigate variation
of betatron tunes between different bunches of proton beams.
As the main effect of the lens comes from the electric field of
the electron bunch, the direction of the e-beam travel is not
essential (usually, counter-propagating beams are used). The
e-lens concept is shown in the same Fig. 10.39.
We will also mention one more arrangement involving an
electron beam and a magnetic field — the Gabor lens. Suggested 15 in 1947, this technique recently attracted attention 16
in connection to its use for laser plasma ion acceleration, for
energy selection of accelerated protons.
FIGURE 10.40
Conceptual schematic of a Gabor lens.
14 V. Shiltsev et al., PR-ST-AB 2, 071001 (1999).
15 D. Gabor, Nature 160, 89–90 (19 July 1947).
16 J. Pozimski et al., Laser and Particle Beams, v. 31, 04, 2013, pp. 723–733.