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AAC 1998 8th

Name: AAC 1998 8th

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Date: 1998-01-01

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Created at: Fri Jul 27 23:53:34 -0700 2007

Updated at: Fri Jul 27 23:53:34 -0700 2007

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4 papers from the conference:

title: An Optimized Slab-Symmetric Dielectric-Based Laser Accelerator Structure
format: conference proceeding
conference: AAC 1998 8th
year: 1999
2 authors: J.B. Rosenzweig | Schoessow, P.
abstract: A slab-symmetric, partially dielectric filled, laser excited structure which may be used to accelerate charged particles is analyzed theoretically and computationally. The fields associated with the accelerating mode are calculated, as are aspects of the resonant filling and impedance matching of the structure to the exciting laser. It is shown through computer simulation that the accelerating mode in this structure can be excited resonantly and with large quality factor Q. Practical aspects of implementing this structure as an accelerator are discussed. (7 References).
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title: Synchronization of sub-picosecond electron and laser pulses
format: conference proceeding
conference: AAC 1998 8th
year: 1999
2 authors: J.B. Rosenzweig | G.P. Le Sage
abstract: Pulse-compression techniques apply a longitudinal restoring force which improves synchronization between electron bunches and the RF drive, partially or completely correcting errors in the exit time from the injector. While this feature is beneficial in terms of linac related phase matching issues and jitter in the photocathode laser system, laser jitter with respect to the RF clock is in fact worsened in terms of the final interaction of laser and electron pulses. That is, if one attempts to synchronize the electron bunch to an external laser, deriving external laser timing from, say, the photocathode drive laser oscillator, the relative timing of electron and the external laser will be mismatched, because the electron beam is pulled toward a given phase of the RF clock. Thus, if one wishes to take advantage of the locking of the electron beam to the (assumed stable) RF clock, then an equivalent mechanism must be found for locking the external laser to the RF clock as well.
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title: Coherent transition radiation-based diagnosis of electron beam pulse shape
format: conference proceeding
conference: AAC 1998 8th
year: 1999
3 authors: J.B. Rosenzweig | A. Murokh | A. Tremaine
abstract: The bunch shapes of an electron beams is increasingly difficult to measure, as the time-scales of interest are now sub-picosecond. We discuss here the use of coherent transition radiation (CTR) for such measurements. Two types of measurements are presented: the deduction of macroscopic (0.3 psec resolution) pulse profile using interferometry, and the examination of microbunch (50 fsec) structure from an FEL-bunched beam using spectral characteristics of the CTR. For the macrobunch measurement we discuss the problem of missing low frequency radiation and one solution for extracting meaningful data with this problem are presented. For microbunch CTR, we examining initial spectrally-resolved measurements, and some interesting deviations in the CTR spectrum from the standard theoretical predictions. (23 References).
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title: Test results of the plasma source for underdense plasma lens experiments at the UCLA Neptune Lab
format: conference proceeding
conference: AAC 1998 8th
year: 1999
7 authors: Suk, H. | C. E. Clayton | R. Narang | P. Muggli | J.B. Rosenzweig | C. Pellegrini | C. Joshi
abstract: A plasma source was developed at UCLA for planned underdense plasma lens experiments, where the plasma density is less than the electron beam density. The argon plasma, produced by a discharge between a LaB_6 cathode at 1330 degrees C and a tantalum anode, is confined by a solenoidal magnetic field and flows transversely across the electron beam path. Extensive test of the plasma source is under way for various conditions before it is assembled with the UCLA photocathode-based electron linac. In particular, different longitudinal (with respect to the electron beam) plasma profiles and effective plasma lengths can be obtained by adjusting the moveable sliding door between the plasma source and the transverse beamline. Test results of the plasma source are presented. (11 References).
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