نتایج جستجو برای: bunch
تعداد نتایج: 4852 فیلتر نتایج به سال:
The dynamics of the acceleration of a short electron bunch in a strong plasma wave excited by a laser pulse in a plasma channel is studied both analytically and numerically in slab geometry. In our simulations, a fully nonlinear, relativistic hydrodynamic description for the plasma wave is combined with particle-in-cell methods for the description of the bunch. Collective self-interactions with...
Modern, high-brightness electron beams such as those from plasma wakefield accelerators and free-electron laser linacs continue the drive to ever-shorter bunch durations. In low-charge operation (~20 pC), bunches shorter than 10 fs are reported at the Linac Coherent Light Source (LCLS). Though suffering from a loss of phase information, spectral diagnostics remain appealing as compact, low-cost...
Installation of a 2856 MHz RF system into the XLS compact electron storage ring would allow the generation of millimeter wave coherent synchrotron radiation. Operating at 150 MeV, one could produce bunches containing on the order of 2x107 electrons with a bunch length σ L0 = 0.3 mm, resulting in coherent emission at wavelengths above 0.8 mm. The characteristics of the source and the emitted rad...
An electron photo-injector facility has been constructed at Fermilab for the purpose of providing a 14–18 MeV electron beam with high charge per bunch (8 nC), short bunch length (1 mm RMS), and small transverse emittance [1]. The facility was used to commission a second-generation photo-cathode RF gun for the TeSLA Test Facility (TTF) Linac at DESY [2, 3]; in the future, the Fermilab electron b...
The Advanced Photon Source (APS) design incorporated a positron accumulator ring (PAR) as part of the injector chain. In order to increase reliability and accommodate other uses of the injector, APS will run with electrons, eliminating the need for the PAR, provided another method of eliminating rf bucket “pollution” in the APS is found. Satellite bunches captured from an up to 30-ns-long beam ...
The Pohang Light Source (PLS) storage ring uses two bunch-by-bunch feedback systems a longitudinal feedback system (LFS) and a transverse feedback system (TFS) to cure the coupled bunch instabilities due to higher order modes of RF cavities and resistive wall impedance. The LFS employs the digital electronics developed for ALS and PEPII and uses a cavity-type kicker, and it was successfully com...
Table 1 shows a comparison between the BTCF and a few high performance electron storage rings which are either recently constructed or presently under construction. The parameters compared are those relevant to the collective effects. A quick glance of the comparison leads to the following observations: BTCF requirements are as demanding as those others in Table 1. A closer inspection shows tha...
The influence of higher-harmonic free-electron laser (FEL) oscillations on an electron beam have been studied by measuring its bunch length at the NIJI-IV storage ring. The bunch length and the lifetime of the electron beam were measured, and were observed to have become longer owing to harmonic lasing, which is in accord with the increase of the FEL gain. It was demonstrated that the saturated...
A fast gate module has been developed at KEKB, which can pick up a signal of one bunch along a bunch train. The gate module was attached to a tune measurement system and to a turn-by-turn beam-position monitor system. Continuous monitoring of the betatron tune is an indispensable tool to keep the machine in a stable condition. A measurement of the tune along a bunch train is helpful to estimate...
A bunch-by-bunch feedback scheme is studied for damping coupled bunch synchmtron oscillations in the proposed PEP11 B Factory. The quasi-linear feedback system design incorporates a phase detector to provide aquantized measure of bunch phase, digital signal processing to compute an error correction signal and a kicker system to correct the energy of the bunches. A farm -of digital processors, o...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید