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De Santis, S.

Paper Title Page
MOPAS024 Fast Extraction Kicker for the Accelerator Test Facility 485
 
  • S. De Santis
    LBNL, Berkeley, California
  • T. Naito, J. Urakawa
    KEK, Ibaraki
 
  Funding: Work supported by the U. S. Department of Energy under Contract No. DE-AC0-05CH11231.

We present the final results of a study for the design of a fast extraction kicker to be installed in the Accelerator Test Facility ring at KEK. The purpose of this project is to test the technologies to be used in the design of the extraction kickers for the International Linear Collider damping rings. The kicker's rise and fall times are important parameters in the final configuration of the rings, since they constrain the minimum distance between bunches and ultimately define a lower limit for the rings length. We investigated a stripline kicker composed of several 65-cm long sections, grouped in two different locations in the ATF damping ring. An analytical study of the kicker's parameter and extensive computer simulations using Microwave Studio* point out the ambitious requirements on the pulsers, in order to be able to satisfy the design specifications. We also investigated the use of a single kicker module, together with a close orbit bump near the extraction septum.

* http://www.cst.com

 
FRPMS019 Measurement of the Propagation of EM Waves Through the Vacuum Chamber of the PEP-II Low Energy Ring for Beam Diagnostics 3946
 
  • S. De Santis, J. M. Byrd
    LBNL, Berkeley, California
  • M. T.F. Pivi
    SLAC, Menlo Park, California
 
  Funding: Work supported by the U. S. Department of Energy under Contract No. DE-AC0-05CH11231.

We present the results of measurements of the electron cloud intensity in the PEP-II low energy ring (LER) by propagating a TE wave into the beam pipe. Connecting a pulse generator to a beam position monitor button we can excite a signal above the vacuum chamber cut-off and measure its propagation with a spectrum analyzer connected to another button a few meters away. The measurement can be performed with different beam conditions and also at different settings of the solenoids used to reduce the build up of electrons. The presence of a modulation in the TE wave transmission, synchronous with the beam revolution frequency and only measurable with the solenoids off, would be directly correlated to the intensity of the electron cloud phenomenon in the relative region of the ring. In this paper we present and discuss our measurements taken near Interaction Region 12 on the LER, during 2006 and early 2007.

 
FRPMS020 Optical Beam Timing Monitor Experiments at the Advanced Light Source 3952
 
  • S. De Santis, J. M. Byrd, R. B. Wilcox
    LBNL, Berkeley, California
  • Y. Yin
    Y. Y. Labs, Inc., Fremont, California
 
  Funding: Work supported by the U. S. Department of Energy under Contract No. DE-AC0-05CH11231.

We present the results of an experimental study of a beam timing monitor based on a technique demonstrated by Loehl*. This technique uses the electrical signal from a beam position monitor to amplitude-modulate a train of laser pulses, converting timing jitter into an amplitude jitter. This modulation is then measured with a photodetector and sampled by a fast ADC. This approach has already demonstrated sub-100 fsec resolution and promises even better results. Our study focuses on the use of this technique for precision timing for storage rings. We show results of measurements using signals from the Advanced Light Source.

* F. Loehl, et al., Proc. of the 2006 EPAC., p. 2781.