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@inproceedings{tamura:linac2022-mopoge13, author = {J. Tamura and Y. Kondo and T. Morishita and F. Naito and M. Otani}, title = {{Acceleration Efficiency of TE-Mode Structures for Proton Linacs}}, booktitle = {Proc. LINAC'22}, % booktitle = {Proc. 31st International Linear Accelerator Conference (LINAC'22)}, pages = {177--179}, eid = {MOPOGE13}, language = {english}, keywords = {DTL, cavity, proton, simulation, impedance}, venue = {Liverpool, UK}, series = {International Linear Accelerator Conference}, number = {31}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {09}, year = {2022}, issn = {2226-0366}, isbn = {978-3-95450-215-8}, doi = {10.18429/JACoW-LINAC2022-MOPOGE13}, url = {https://jacow.org/linac2022/papers/mopoge13.pdf}, abstract = {{Various types of cavity structures are typically used in hadron linacs, depending on the energy range of the beam particle. This is especially the case in a normal-conducting linac, because the cavity’s acceleration efficiency varies with the velocity of the synchronous particle. For low-energy proton acceleration, while Alvarez drift-tube linacs (DTLs) are the most prevalent, TE-mode accelerating structures, which could also be called H-mode structures, are also widely used immediately after an initial radiofrequency quadrupole linac (RFQ). At present, the representative structures of TE modes are interdigital H-mode (IH) DTL and crossbar H-mode (CH) DTL, which are based on the TE11-mode pillbox cavity and TE21-mode pillbox cavity, respectively. In this presentation, acceleration efficiency of TE-mode structures including higher-order TE-modes such as TE31 and TE41 was comparatively reviewed with Alvarez DTL. This study shows that IH-DTL and CH-DTL have a larger shunt impedance than Alvarez DTL for proton acceleration below 10 MeV, and furthermore for the TEm1-mode structures, the rotational symmetry of the electric field improves with increasing angular index m.}}, }