A 400m-long superconducting RF linac cryostat design for an ERL light source

エネルギー回収型リニアック放射光源の為の400m長単一超伝導高周波線型加速器冷凍装置設計

峰原 英介

Minehara, Eisuke

エネルギー回収型リニアック放射光源の為の400m長単一超伝導高周波線型加速器冷凍装置を最適設計を行った。熱進入を最小にする為に、必要な400mの加速長を単一の400mの長さの冷凍装置を設計した。運転を容易に、かつ数十年以上に渡り安定で無故障とするために1台の冷凍装置とすることと連続無停止で冷却し、全計画全寿命に渡り、熱サイクルを半周期とすることはこのような装置にとって必要不可欠な設計概念である。関連するこれまでの原研FELの無蒸発自立式冷凍装置,超伝導線型加速器の運転実績や設計についても報告する。

A 400m-long superconducting RF linac cryostat is conceptually designed and discussed to optimize the advanced low-temperature cryostat for an ERL light source. A low temperature cryostat for superconducting RF linacs and other superconducting devices should be designed and made to minimize its heat invasion through the heat bridges between the room and low temperature parts. The cryostat also should be designed and made to minimize total number of the heat cycles for the rest of its life after the initial test. We can expect that the total number of the heat bridges is roughly proportional to the number of the cryostat, and a life interval between two contiguous cryostat malfunctions inversely proportional to the number of the heat cycles. Therefore, if we can design and make a single and long cryostat to realize the operation less than a half cycle for the rest of its life, we can run our cryostat for a very longer interval than tens of years and with minimum electricity.