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TY - CONF AU - Nagatomo, T. AU - Kamigaito, O. AU - Kase, M. AU - Nakagawa, T. AU - Stetson, J.W. AU - Tzoganis, V. ED - Schaa, Volker RW TI - Four-Dimension Transverse Phase-Space Distribution Measured by a Pepper-Pot Emittance Meter J2 - Proc. of ECRIS2016, Busan, Korea, August 28 - September 1, 2016 C1 - Busan, Korea T2 - International Workshop on ECR Ion Sources T3 - 22 LA - english AB - Four-dimensional (4-D) transverse emittance of the highly charged heavy ion beam extracted from ECR ion source is invariant under linear 4-D symplectic operation. Thus, it is essential quantity to improve the beam quality. Measurement of the 4-D phase-space distribution provides quantitative and essential information to improve the efficiency of beam transport. We have developed an on-line pepper-pot-type emittance meter, which is a suitable device to obtain the 4-D phase-space distribution from an image of beamlets passing through the well-aligned pinholes. The emittance meter consists of a thin metal plate with a pinhole array, which is translated along the beam axis, and an imaging screen (P46) with a MCP. We optimized the analysis procedure to obtain the distribution so that the elapsed time of the process was shortened as less than 1 second, and which was enough short for on-line measurements. We will discuss the quality of the obtained 4-D distribution by comparing it with the one obtained from a simulation. Further, we will also discuss how the gas pressure of LEBT affects the 4-D distribution to establish to improve the beam brightness. PB - JACoW CP - Geneva, Switzerland SP - 125 EP - 128 KW - ion KW - emittance KW - ECR KW - plasma KW - injection DA - 2016/10 PY - 2016 SN - 978-3-95450-186-1 DO - 10.18429/JACoW-ECRIS2016-WEPP35 UR - http://jacow.org/ecris2016/papers/wepp35.pdf ER -