Production and testing considerations for CESR-c wiggler magnets

Abstract

After construction of a prototype unit, five additional wiggler magnets for the CESR-c conversion have been completed at a rate exceeding one per month. These 2.1 T superferric magnets are built and assembled primarily in house with a minimal staff. We describe the general design and fabrication methods for these magnets. An additional 10 magnets will be constructed to complete the complement in the ring plus two spare units.

International Linear Collider Reference Design Report

“…This technology choice offers flexibility for tuning and optimizing the rings as well as for adjusting the operating beam energy by a few percent around the nominal value of 5 GeV. Superconducting wigglers based on the CESR-c design [31] provide sufficient field quality that the wigglers impose no limitation on the damping ring dynamic aperture. or less, based on CESR-c experience.…”

“…Similarly, the RF cavity units can be designed by scaling from existing 500 MHz superconducting module designs currently in operation at CESR, KEK, and elsewhere. The RF cryomodule dimensions are 3.5 m in length and 1.5 m in diameter [31].…”

Configuration Studies and Recommendations for the ILC DampingRings

“…Fabrication costs for a superferric wiggler may be based on those for the CESR-c wigglers [59]; including power supplies and cryogenics, the estimated total fabrication cost is of the order of $160k per meter. Assuming that a superferric wiggler will be maintained in the cold state for the majority of each operating year, the estimated yearly cryogenics and power costs, at a rate of $0.10 per kW•hr, will be around $1k per meter per year.…”

Configuration Studies and Recommendations for the ILC DampingRings

“…65) where R(θ) = cos θ sin θ − sin θ cos θ (3.66) σ ξ and σ η are the rms bunch sizes along the major and minor semi-axes of the transverse bunch distribution in coordinate space, as shown inFigure 3 59…”