Characteristics of Electron-cooled Bunched Beams Predicted by a Simulation

نویسنده

  • M. Takanaka
چکیده

Characteristics of electron-cooled bunched ion beams have been studied using the particle-tracking simulation in which the space-charge force and the force induced through the transverse broadband impedance are taken into account. The beams become space-charge dominated during the bunching of coasting beams. The simulation results show that the beams meet the transverse instability which can be cured by a transverse feedback, and the seed of the instability is the toroid field of the electron-cooling section. The following RF-wave-form distortion phenomena can be seen at stable or stabilized bunched beams. As well as the longitudinal line density becomes parabolic-liked, the nearer to the bunch center, the larger the beam size is. The bunch motion is a quasi-elastic motion instead of the synchrotron oscillation in the longitudinal direction, and is a dipole-mode coherent oscillation with the head-tail-mode number 1 in the horizontal direction.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Transverse Instablility Due to the Space Charge During the Electron-Cooling Bunching of Ion Beams

A beam-tracking simulation has been done for study of the electron-cooling bunching of ion beams around a few hundred MeV/u. In the simulation, the field due to the space charge of a beam in a round vacuum chamber is calculated from the charge distribution of macro-particles and the image particles due to the macro-particles. The simulation results show that the bunched beams meet a transverse ...

متن کامل

Monte Carlo Simulation of Electron Beams produced by LIAC Intraoperative Radiation Therapy Accelerator

Background: One of the main problems of dedicated IORT accelerators is to determine dosimetric characteristics of the electron beams. Monte Carlo simulation of IORT accelerator head and produced beam will be useful to improve the accuracy of beam dosimetry.Materials and Methods: Liac accelerator head was modeled using the BEAMnrcMonte Carlo simulation system. Phase-space files were generated at...

متن کامل

Electron Cloud Effects in the J-parc Rings and Related Topics

Electron build-up and collective beam instabilities in the J-PARC rings has been expected by simulation. Bunched beam parameters are close to instability threshold. Coasting beam is stable at the nominal parameter. One of implications is that J-PARC is not in saturation regime, which suggests that keeping the source of electrons, i.e. beam losses, less than a critical value is effective to redu...

متن کامل

Green ' s Function Analysis of Bunched Charged Particle

In this thesis, we analyze the dynamics and equilibrium of bunched charged particle beams in the presence of perfectly conducting walls using a Green's function technique. Exact self-consistent electric and magnetic fields are obtained for charged particles in the vicinity of a conducting boundary with the use of Green's functions. We present three analytical models of bunched beams in a cylind...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2001