10
Advanced Beam
Manipulation, Cooling,
Damping and Stability
10.1 Short and
We have arrived at the second-to-last chapter. The scope of
narrow-band 185 this chapter is a mixture of beam and pulse manipulation
10.2 Laser–beam
topics, selected based on the degree of the synergy they exinteraction
196 hibit in four areas that we previously discussed. The first
10.3 Stability of beams
three areas are accelerators, lasers and plasma (see Chapter
200
4), and the fourth area is the methodology of inventiveness.
10.4 Beam or pulse
We will start this chapter with the methods and techaddition
209 niques for creating short bunches of charged particles and
10.5 Cooling and phase also short laser pulses. We will follow with a discussion of
transfer
214 various topics of beam stability and ways to enhance the in10.6 Local correction
tensity of both the particle beams and the laser pulses. We
217
will conclude with an overview of cooling methods, as well
as local disturbance correction methods, aiming to connect
these and other techniques to Accelerating Science TRIZ.
10.1 Short and narrow-band
The topic of bunch and pulse compression is an area that
shows strong synergy between accelerators and lasers. This
is a broad area that includes techniques of bunch or pulse
compression as well as techniques for creating short bursts
of radiation. We will also pay attention to some effects that
may prevent the formation of ultra-short bunches — notably
coherent synchrotron radiation. Connected to the topic of short
pulse or bunch creation is the theme of narrow-band radiation, where techniques developed in optics and lasers merge
with the accelerator-based techniques.
10.1.1 Bunch compression
Short electron bunches are typically produced by RF photo
guns where the cathode is illuminated by a short laser pulse.
Such photo injectors produce relatively long pulses (a few ps),
while for many applications, such bunches would be too long
and femtosecond bunches would be required instead.
Some compression of the beam may be performed already
in the photo injector, via the technique of velocity bunching. In
this case, by properly adjusting the moment when the laser
illuminates the cathode with the RF field in the gun, one
can create correlation between the energy of electrons and
the longitudinal position within the bunch. The difference of
185
DOI: 10.1201/b18696-10
Advanced Beam
Manipulation, Cooling,
Damping and Stability
10.1 Short and
We have arrived at the second-to-last chapter. The scope of
narrow-band 185 this chapter is a mixture of beam and pulse manipulation
10.2 Laser–beam
topics, selected based on the degree of the synergy they exinteraction
196 hibit in four areas that we previously discussed. The first
10.3 Stability of beams
three areas are accelerators, lasers and plasma (see Chapter
200
4), and the fourth area is the methodology of inventiveness.
10.4 Beam or pulse
We will start this chapter with the methods and techaddition
209 niques for creating short bunches of charged particles and
10.5 Cooling and phase also short laser pulses. We will follow with a discussion of
transfer
214 various topics of beam stability and ways to enhance the in10.6 Local correction
tensity of both the particle beams and the laser pulses. We
217
will conclude with an overview of cooling methods, as well
as local disturbance correction methods, aiming to connect
these and other techniques to Accelerating Science TRIZ.
10.1 Short and narrow-band
The topic of bunch and pulse compression is an area that
shows strong synergy between accelerators and lasers. This
is a broad area that includes techniques of bunch or pulse
compression as well as techniques for creating short bursts
of radiation. We will also pay attention to some effects that
may prevent the formation of ultra-short bunches — notably
coherent synchrotron radiation. Connected to the topic of short
pulse or bunch creation is the theme of narrow-band radiation, where techniques developed in optics and lasers merge
with the accelerator-based techniques.
10.1.1 Bunch compression
Short electron bunches are typically produced by RF photo
guns where the cathode is illuminated by a short laser pulse.
Such photo injectors produce relatively long pulses (a few ps),
while for many applications, such bunches would be too long
and femtosecond bunches would be required instead.
Some compression of the beam may be performed already
in the photo injector, via the technique of velocity bunching. In
this case, by properly adjusting the moment when the laser
illuminates the cathode with the RF field in the gun, one
can create correlation between the energy of electrons and
the longitudinal position within the bunch. The difference of
185
DOI: 10.1201/b18696-10