نتایج جستجو برای: bunch size
تعداد نتایج: 560320 فیلتر نتایج به سال:
We report the results of experiments on a “fast beam-ion instability”[1] at the Advanced Light Source (ALS). This ion instability, which can arise even when the ions are not trapped over multiple beam passages, will likely be important for many future accelerators. In our experiments, we filled the ALS storage ring with helium gas, raising the pressure approximately two orders of magnitude abov...
The transverse instability in a beam and the blow-up in its size caused by an electron cloud become increasingly important in high-intensity accelerators. The electron cloud builds up through beam-induced multipacting. We investigated the energy spectrum of an electron cloud with short bunch using particle simulation. A "stop-band" structure is found and a model is suggested to explain and to d...
The genetic variation is fundamental to most genetics programs, and selections rely on the existence of favorite genetic diversity of studied traits. This research was carried out in order to identify genetic variation of 14 grape cultivars using 28 fruit qualitative and quantitative traits. Results showed noticeable variation among cultivars at all studied traits which explain significant diff...
The ANKA storage ring offers different operation modes including the short-bunch mode with bunch lengths tuned down to a few picoseconds. This can lead to the occurrence of micro-bunching instabilities coupled to the emission of coherent synchrotron radiation (CSR) in so-called ’bursts’. To study this CSR instability we use several turn-by-turn enabled detector systems to synchronously measure ...
A plasma-wakefield accelerator has accelerated particles by over 2.7 GeV in a 10 cm long plasma module. A 28.5 GeV electron beam with 1.8 x 10(10) electrons is compressed to 20 microm longitudinally and focused to a transverse spot size of 10 microm at the entrance of a 10 cm long column of lithium vapor with density 2.8 x 10(17) atoms/cm3. The electron bunch fully ionizes the lithium vapor to ...
A bunch-by-bunch beam diagnostic system which consists of a high speed light shutter and an optical beam detector has been developed. Since the open/close time of the shutter is comparable to a bunch spacing of 2 ns, it is capable of picking out the light pulses from a particular bunch in a bunch train. The selected pulses can be analyzed with conventional optical beam diagnostic methods in ord...
In recent years there has been an increasing demand for non-invasive beam size monitoring on particle accelerators. Ideally these monitors should be cost effective and require little or no maintenance. These monitors should also be suitable for both linear and circular machines. Here, the experimental setup is described in detail and the results from a diffraction radiation beam size monitor ar...
A diffraction-limited storage ring like NSLS2 requires stringent beam stability. Even with careful design of vacuum component to limit the geometric impedance, due to resistive wall impedance and fast-ion effect, transverse instabilities will happen at low current (~15mA). An active transverse feedback system has been designed to cure the coupled bunch instability. The system will have less tha...
We present the results of electron beam longitudinal modulation studies in the DUV-FEL accelerator. For bunch length determination we used the zero-phasing method, based on a measurement of the chirped electron bunch energy spectra. The measurements revealed a spiky structure in the longitudinal phase space [1]. A model based on space charge effect is considered [2] to explain of the obtained...
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