IBIC2017 - List of Authors (Koiso, H.)

Paper	Title	Page
TU3AB1	Optics Measurements at SuperKEKB Using Beam Based Calibration for BPM and Beam Based Experiment	141
	H. Sugimoto, H. Koiso, A. Morita, Y. Ohnishi, M. Tejima KEK, Ibaraki, Japan
	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.
	Slides TU3AB1 [10.644 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TU3AB1
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Optics Measurements at SuperKEKB Using Beam Based Calibration for BPM and Beam Based Experiment

141

H. Sugimoto, H. Koiso, A. Morita, Y. Ohnishi, M. Tejima
KEK, Ibaraki, Japan

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.

Slides TU3AB1 [10.644 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TU3AB1

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)