Lessons from the 3-pole Sc Wiggler Test
نویسندگان
چکیده
In a framework of a CESR upgrade to Charm-Factory [1], there was proposed to install wigglers for obtaining the damping required. Such a wiggler unit supposed to be short enough allowing modular filling of the ring’s free space [2]. As the full-scale wiggler model is a long-time enterprise, it was suggested, that 3-pole model can be manufactured quickly and all nuances of technology and engineering can be evaluated a prior to the full-scale prototype [2]. This suggestion was based on existing 12” Dewar with all necessary current feedthrough and service elements specially designed for the SC magnet tests [3]. Despite the wiggler period initially suggested was 28 cm [2], those days concerns about irradiation of the walls of CESR’s vacuum chamber moved it to 20 cm. Latest considerations show however that problems with beam dynamics require longer period, hence problems with wall irradiation recognized as less important. So the wiggler period was finally settled as 40 cm. So mostly for historical reasons the wiggler model for the test described here has period of 20 cm. The latest calculations indicated that wiggler will have five poles with equal field and two end poles with ~ a half field each [4]. The operational field is supposed to be up to 3.5 T. Each of the end poles also carries additional multi-turn trim coil. These additional coils are connected in series and will trim integral of magnetic field over the wiggler.
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