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@inproceedings{fuwa:linac2022-tupojo11, author = {Y. Fuwa and K. Moriya and T. Takayanagi}, title = {{Design of Beam Focusing System with Permanent Magnet for J-PARC LINAC MEBT1}}, booktitle = {Proc. LINAC'22}, % booktitle = {Proc. 31st International Linear Accelerator Conference (LINAC'22)}, pages = {364--367}, eid = {TUPOJO11}, language = {english}, keywords = {octupole, MEBT, linac, focusing, emittance}, 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-TUPOJO11}, url = {https://jacow.org/linac2022/papers/tupojo11.pdf}, abstract = {{Space charge compensation technology using higher-order multipole magnetic field components has been proposed to transport high-intensity charged particle beams for J-PARC LINAC MEBT1. In order to realize this compensation technology in a limited beam line space, we devised a compact-size combined-function multipole permanent magnet. This magnet can produce two multipole components at the same location on the beam line. As a first step, we have designed a magnet to simultaneously generate a fixed-strength quadrupole and an adjustable-strength octupole component using permanent magnet materials. In this magnet model, the magnetic circuit consists of two groups of magnets.}}, }