EM Structure-Based Accelerators
Group-Leader: Wayne Kimura, STI Optronics (firstname.lastname@example.org)
Group-Co-leader: Steve Lidia, LBNL (SMLidia@lbl.gov)
accelerators cover a wide range of different technologies
and schemes – everything from more established
techniques, such as dielectric-loaded structures and
IFELs, to methods that are still at the proof-of-principle
stage, such as vacuum laser acceleration and photonic
bandgap structures. It is not unusual for new schemes
to be introduced in this working group (WG).
This group has been charged with the task of developing
the design parameters for a 1 GeV EM-structure based
accelerator. Because this design could be based upon
a number of different approaches represented in this
WG, our plan is to ask several workshop participants
to be “champions” for specific schemes.
We will ask the champions to do the following:
Develop a “strawman” design for an optical
laser accelerator with a net energy gain of 1 GeV, for
schemes that have already shown energy gain in proof-of-principle
experiments. They are free to define all required parameters
including initial e-beam characteristics (energy, emittance,
beam charge, etc.), laser wavelength, power, gradient,
overall length, number of stages, and other ancillary
devices (e.g., bunchers, chicanes, focusing magnets).
Their design should include as appropriate estimated
values for parameters such as impedance, wake potential,
emittance requirements and evolution, any nonlinear
effects, thermal and optical damage limitations, total
beam charge accelerated, etc. The intent of this exercise
is not to show how far the mechanism can be scaled in
gradient or net energy gain, but rather to show how
a practical I GeV laser accelerator or wakefield accelerator
might look like, quantify major scheme- and geometry-dependent
constraints, and identify where future work is still
We will request that the champions prepare most of their
strawman design before the Workshop and present their
design in a talk given to the WG for general discussion.
During the week of the Workshop the designs can be fine-tuned.
At the end of the Workshop the designs will be summarized
to the rest of the Workshop attendees.
In addition to the presentations by the champions, the
WG will accept contributed papers and ask invited speakers
to review topics of general interest to the WG participants.