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Analysis and correction of linear optics errors,and operational improvements in the Indus-2 storage ring

Chinese Physics C 2017年第8期41卷 130-142页

作者： Riyasat Husain A.D.Ghodke Accelerator Physics Section Raja Ramanna Centre for Advanced TechnologyIndore452013India Homi Bhabha National Institute Training School ComplexAnushakti NagarMumbai 400094India

Estimation and correction of the optics errors in an operational storage ring is always vital to achieve the design performance. To achieve this task, the most suitable and widely used technique, called linear optics from closed orbit（LOCO） is used in almost all storage ring based synchrotron radiation sources. In this technique, based on the response matrix fit, errors in the quadrupole strengths, beam position monitor（BPM） gains, orbit corrector calibration factors etc. can be obtained. For correction of the optics, suitable changes in the quadrupole strengths can be applied through the driving currents of the quadrupole power supplies to achieve the desired optics. The LOCO code has been used at the Indus-2 storage ring for the first time. The estimation of linear beam optics errors and their correction to minimize the distortion of linear beam dynamical parameters by using the installed number of quadrupole power supplies is discussed. After the optics correction, the performance of the storage ring is improved in terms of better beam injection/accumulation, reduced beam loss during energy ramping, and improvement in beam lifetime. It is also useful in controlling the leakage in the orbit bump required for machine studies or for commissioning of new beamlines.

关键词： LOCO code beta-beat betatron coupling beam lifetime Indus-2 storage ring

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coupling measurement and correction at the SSRF storage ring

Coupling measurement and correction at the SSRF storage ring

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第一届中国粒子加速器会议

作者： ZHANG ManZhou HOU Jie LI HaoHu Shanghai Institute of Applied Physics Chinese Academy of Sciences

Brightness is an important parameter for 3 generation light *** the emittance coupling is a realistic way to increase brightness without any additional equipment in a machine under *** main sources of emittance coupling are betatron coupling and vertical *** the SSRF storage ring,tune split and LOCO are used to measure the respective betatron and emittance *** of these sources can be corrected by skew *** measuring the skew quadrupole-coupling response matrix,betatron coupling can be changed from 0.014%to 2%.But the vertical dispersion changes at the same *** can find the suitable setting to correct simultaneously the betatron coupling and vertical *** emittance coupling can be reduced to 0.17%by this *** simulations show the potential for smaller emittance coupling if more skew quadrupoles are employed.

关键词： emittance coupling betatron coupling vertical dispersion tune split LOCO

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