The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF AU - Yang, Y. AU - Liu, Y. AU - Sun, L.T. AU - Yuan, Y.J. AU - Zhao, H.W. ED - Schaa, Volker RW TI - Transverse Coupling of Ion Beams From an RCR Ion Source 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 - ECR ion source beam quality will deteriorate under the influence of beam transverse coupling and high-order magnetic field aberration. Ion beams from an ECR ion source will experience a descending axial magnetic field at the extraction region, leading to a strong transverse coupling to the extracted beam, with projection emittance growth both in horizontal and vertical and two eigen emittances separation. On the other hand, sextupole field in the ECR and the sextupole component in the analyzing dipole can also degrade the beam quality by resulting in beam distortion. Proper adjusting of the extraction field strength of the ion source and the pre-focusing solenoid field can help to weaken the correlation in the inter-plane phase spaces and reduce the projection emittances. Another approach to improve the beam quality is to compensate for the high-order magnetic fields. This paper presents the property of beam coupling in the transverse phase space by analytical theory and simulations. Some experimental results are also presented and discussed. In addition, a high-order compensation scheme is displayed, whose feasibility has been verified by preliminary tests with SECRAL at IMP. PB - JACoW CP - Geneva, Switzerland SP - 76 EP - 82 KW - ion KW - emittance KW - extraction KW - solenoid KW - coupling DA - 2016/10 PY - 2016 SN - 978-3-95450-186-1 DO - 10.18429/JACoW-ECRIS2016-WECO03 UR - http://jacow.org/ecris2016/papers/weco03.pdf ER -