The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF AU - Sugimoto, H. AU - Koiso, H. AU - Morita, A. AU - Ohnishi, Y. AU - Tejima, M. ED - Liu, Zhengzheng ED - Lidia, Steven ED - McCausey, Amy ED - Schaa, Volker RW TI - Optics Measurements at SuperKEKB Using Beam Based Calibration for BPM and Beam Based Experiment J2 - Proc. of IBIC2017, Grand Rapids, MI, USA, 20-24 August 2017 C1 - Grand Rapids, MI, USA T2 - International Beam Instrumentation Conference T3 - 6 LA - english AB - SuperKEKB is an electron-position collider realizes a new luminosity frontier. The target luminosity is 8x10³⁵ cm⁻² s⁻¹. The initial beam commissioning started in February 2016 and operated until June 2016. Low Emittance Tuning (LET) is an important issue in the beam commissioning. The Beam-Based Calibration (BBC) scheme for Beam-Position-Monitor (BPM) has been applied in order to establish reliable beam measurement system. In the BBC, a response model among beam position, charge and output signals of the BPM electrodes are introduced to calibrate the relative gain of each electrodes. The gains are adjusted by least squares fitting so that the model reproduces the measured BPM signals. The Beam-Based Alignment (BBA) is also performed to determine the magnetic center of each quadrupole magnet. Using the BBC, the performance of the BPM system and optics correction has been successfully improved. After the series of the optics tuning and the BPM calibration, the vertical emittance of about 10 pm is achieved in the positron ring. This paper presents what we experienced during the beam commissioning focusing on the beam optics measurement and the BBC scheme for the BPM system. PB - JACoW CP - Geneva, Switzerland SP - 141 EP - 145 KW - ion KW - optics KW - MMI KW - quadrupole KW - emittance DA - 2018/03 PY - 2018 SN - 978-3-95450-192-2 DO - 10.18429/JACoW-IBIC2017-TU3AB1 UR - http://jacow.org/ibic2017/papers/tu3ab1.pdf ER -