タイトル | Hydroforming of superconducting TESLA cavities |
その他のタイトル | 超伝導TESLA空洞のハイドロフォーミング |
著者(日) | Singer, Waldemar; Kaiser, H.; Singer, X.; Weichert, G.; Jelezov, I.; Khabibuline, T.; Skasyrskaia, A.; Kneisel, P.; 藤野 武夫; 斉藤 健治 |
著者(英) | Singer, Waldemar; Kaiser, H.; Singer, X.; Weichert, G.; Jelezov, I.; Khabibuline, T.; Skasyrskaia, A.; Kneisel, P.; Fujino, Takeo; Saito, Kenji |
著者所属(日) | Deutsches Elektronen-Synchrotron; Deutsches Elektronen-Synchrotron; Deutsches Elektronen-Synchrotron; Deutsches Elektronen-Synchrotron; Institute for Nuclear Research; Institute for Nuclear Research; Institute for Nuclear Research; T. Jefferson Natl. Accelerator Facility; 高エネルギー加速器研究機構; 高エネルギー加速器研究機構 |
著者所属(英) | Deutsches Elektronen-Synchrotron; Deutsches Elektronen-Synchrotron; Deutsches Elektronen-Synchrotron; Deutsches Elektronen-Synchrotron; Institute for Nuclear Research; Institute for Nuclear Research; Institute for Nuclear Research; Thomas Jefferson National Accelerator Facility; High Energy Accelerator Research Organization; High Energy Accelerator Research Organization |
発行日 | 2003-06 |
刊行物名 | Proceedings of the 10th Workshop on RF Superconductivity, SRF2001 Proceedings of the 10th Workshop on RF Superconductivity, SRF2001 |
開始ページ | 170 |
終了ページ | 176 |
刊行年月日 | 2003-06 |
言語 | eng |
抄録 | Seamless fabrication of single-cell and multi-cell TESLA shape cavities by hydroforming has been developed at DESY. The forming takes place by expanding the seamless tube with internal water pressure while simultaneously swaging it axially. Tube radius and axial displacement are being computer controlled in accordance with results of FEM simulations and the experimentally obtained strain-stress curve of tube material. Several Nb single cell cavities have been produced. A first bulk Nb double cell cavity has been fabricated. The Nb seamless tubes have been produced by spinning and deep drawing. Surface treatment such as buffered chemical polishing, (BCP), electropolishing (EP), high pressure ultra pure water rinsing (HPR), annealing at 800 C and baking at ca. 150 C have been applied. The best single cell bulk Nb cavity has reached an accelerating gradient of E(sub acc) greater than 42 MV/m after ca. 250 micrometer BCP and 100 micrometer EP. Several bimetallic NbCu single cell cavities of TESLA shape have been fabricated. The seamless tubes have been produced by explosive bonding and subsequent flow forming. The thicknesses of Nb and Cu layers in the tube wall are about 1 mm and 3 mm respectively. The RF performance of NbCu clad cavities is similar to that of bulk Nb cavities. The highest accelerating gradient achieved was 40 MV/m after ca. 180 micrometer BCP, annealing at 800 C and, baking at 140 C for 30 hours. The degradation of the quality factor Q(sub 0) after repeated quenching is moderate, after ca. 150 quenches it reaches the saturation point of Q(sub 0) = 1.4 x 10(exp 10) at low field. This indicates that on the basis of RF performance and material costs the combination of hydroforming with tube cladding is a very promising option. |
キーワード | TESLA cavity; hydroforming; superconducting cavity resonator; Nb/Cu clad cavity; bulk Nb cavity; seamless fabrication; RRR; accelerating gradient; surface treatment; research and development; buffered chemical polishing; electropolishing; TESLA空洞; ハイドロフォーミング; 超伝導空洞共振器; Nb/Cuクラッド空洞; バルク・ニオブ空洞; シームレス製造; RRR; 加速勾配; 表面処理; 研究開発; 緩衝液化学研磨; 電解研磨 |
資料種別 | Conference Paper |
SHI-NO | AA0046174030 |
レポートNO | KEK-Proceedings-2003-2 |
URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/37051 |
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