Kanazawa, K.

Paper	Title	Page
MIT01	Electron Cloud Mitigation Investigations at CesrTA	41
	J. Calvey, J. Makita, M. Palmer, R. Schwartz, C. Strohman Cornell University - CLASSE S. Calatroni, G. Rumolo CERN K. Kanazawa, Y. Suetsugu KEK M. Pivi, L. Wang SLAC National Accelerator Laboratory
	Over the course of the CesrTA program at Cornell, over 30 Retarding Field Analyzers (RFAs) have been installed in the CESR storage ring. These devices, which measure the local electron cloud density and energy distribution, have been deployed in drift, dipole, quadrupole, and wiggler field regions. They can be used to evaluate the efficacy of cloud mitigation techniques in each magnetic field element. Techniques investigated so far include different beam pipe coatings, grooves, and clearing electrodes. This talk will provide an overview of the electron cloud mitigation program at CESR, give a preliminary evaluation of the effectiveness of various mitigation techniques, and discuss methods used to obtain quantitative information about vacuum chamber properties via simulation.
	Slides
DIA03	Analysis of the Electron Cloud Density Measurement With RFA in a Positron Ring	184
	K. Kanazawa, H. Fukuma KEK P. Jain The Graduate University for Advanced Studies
	In a positron ring such as KEKB LER, clouding electrons receive an almost instantaneous kick from circulating bunches. Therefore, high energy electrons in the cloud are produced just after the interaction with the bunch locally around the beam. The authors gave an estimation of their density using a high energy electron current measured with RFA and a calculated volume neglecting their initial velocity before the interaction with the bunch. To evaluate the accuracy of this estimation, the process of the measurement is analyzed using the phase space density for the motion of electrons in the transverse plane of the beam. The expressions that can evaluate the accuracy of the estimation with the help of simulation are obtained. One of the authors has shown that the accuracy for a drift space is within ±5% error. For other cases such as in a solenoid field, in a quadruple field, the evaluation is not yet given. In addition to this discussion, some examples of the estimation with RFA are shown.
	Slides