CERN - European Organization for Nuclear Research

Minutes of the CLIC Meeting - 9 May 2005


Agenda:
Evacuation of SR power from CLIC damping ring
Dynamic Aperture of the CLIC Damping Ring
Speakers:
Konstantin Zolotarev / BINP, Pavel Piminov / BINP


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.

copy of Pavel's slides (pdf format)


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Frank Tecker  - Last updated  13-05-2005