Author: Li, J.
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WEPOW008 Specific Operation Modes at the Metrology Light Source 2829
  • J. Feikes, P. Goslawski, J. Li, M. Ries, M. Ruprecht, G. Wüstefeld
    HZB, Berlin, Germany
  • A. Hoehl
    PTB, Berlin, Germany
  The high flexibility of the Metrology Light Source (MLS) allows application of various nonstandard user modes adapted to the specific needs of their users. We report on some of them including a mode for division of the revolution frequency for the user signal and a mode with an adjustable photon pulse delay on the few ps scale.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW008  
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WEPOW010 Beam Lifetime Optimization by Adjusting the Sextupoles at the MLS and BESSY 2837
  • J. Li, J. Feikes, P. Goslawski, M. Ries, M. Ruprecht, T. Tydecks
    HZB, Berlin, Germany
  The Metrology Light Source (MLS) is a dedicated elec-tron storage ring for metrology applications with three families of sextupoles. The existing setting of the three independently powered sextupole families respective to lifetime were roughly determined by scanning their strengths against each other. As a flexible machine the sextupole families of the MLS can be regrouped into new families, which increase the complexity of the scan pro-cedure. Consequently the former strategy would be too time-consuming for refined global scan and it has to be complemented with physical constraints. Therefore a scheme has been developed to keep the chromaticity in a reasonable range during the scan and to reduce the degree of freedom, which is even more important at BESSY II with increasing number of independent sextupole cir-cuits. This paper presents the principle of sextupole scan and the experimental results at the MLS and preliminary test at BESSY II.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOW010  
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THPOW011 The Measurement System of the Electron Gun with Double-anode Structure 3954
  • F.L. Shang, J. Li, L. Shang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  Funding: National Natural Science Foundation of China(11175181); National Natural Science Foundation of China(10875116)
The double-anode structure with an intermediate electrode has been proposed to overcome the strong space-charge force on the cathode and improve the transverse focusing, which make the goal of high perveance and high compression ratio achieved. This gun plays a key role as the external injecting electron source of the independently-tunable-cells (ITC) RF gun. In order to understand the quality of the beam, a measurement system has been designed. The papers present the measurement system and the result of the test.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOW011  
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