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TY - CONF AU - Sakanaka, S. AU - Haga, K. AU - Honda, Y. AU - Matsumura, H. AU - Miyajima, T. AU - Nogami, T. AU - Obina, T. AU - Sagehashi, H. AU - Shimada, M. AU - Yamamoto, M. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Measurement and Control of Beam Losses Under High Average-current Operation of the Compact ERL at KEK J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - The compact ERL (cERL)* is a superconducting accelerator aimed at demonstrating excellent ERL technologies for the future light source. The cERL comprises a 5 MeV injector, a main linac, and a recirculation loop. In the cERL, production and transportation of low-emittance and high average-current beams (tentative goals: 1 mm-mrad and 10 mA) is primarily important. At this moment (in December 2015), beam currents of up to 80 uA (CW) have successfully been transported through the recirculation loop at a beam energy of 20 MeV. Before such high-current operations, we carefully tuned up the machine so that beam losses became very small. The beam losses were watched using fast beam-loss detectors and radiation monitors while absolute losses were estimated from measured radiation levels on the roof of the shield. After careful beam-optics corrections and elimination of beam halos / tails at low-energy section, we achieved the beam losses of at most a few nA level at several locations along the loop, and those below 1 nA elsewhere in the loop. We will report these results together with the result of higher-current operation which is planned early in 2016. PB - JACoW CP - Geneva, Switzerland SP - 1839 EP - 1842 KW - radiation KW - operation KW - beam-losses KW - recirculation KW - optics DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-TUPOW038 UR - http://jacow.org/ipac2016/papers/tupow038.pdf ER -