Evacuation
of SR power from CLIC damping ring (Konstantin
Zolotarev)
The problem of absorption of
synchrotron radiation (SR) power generated inside wigglers of damping
rings is a difficult technical task. The 38 wigglers installed in one
straight section of the CLIC dampings rings produce radiation with
total power of about 700 kW. The power density in the end of the
straight sections is about 2 kW per square mm. Such a high power
density can be destructive for vacuum chambers. Therefore a
careful design and placement of appropriate radiation collimators and
absorbers is required.
In this presentation the method to compute SR power density are
described as well as options for safe absorption of the SR power. All
calculations were performed for the current design of CLIC damping ring
and wigglers. Some related problems for absorption of high SR power are
described.
copy of
Konstantin's transparencies (
pdf
format)
Dynamic
Aperture of the CLIC Damping Ring (Pavel
Piminov)
To attain high luminosity goal in the
Compact Linear Collider (CLIC) damping rings with extremely low
equilibrium transverse emittance and fast damping rate are required. To
construct the damping ring special unit cells with low dispersion
function and damping wigglers in the dispersion free straight section
are used. Unfortunately, strong sextupole magnets needed to correct
high natural chromaticity and nonlinearities of damping wigglers
provide reduction of a dynamic aperture. In the paper results of
nonlinear particle motion simulation and dynamic aperture calculation
are presented.
The simulation was performed by
general purpose tracking code ACCELERATICUM developed at BINP. To track
particles through the wigglers the fast and effective canonical
integration technique is used. Some recommendations for increasing of
dynamic aperture are proposed.