Simulations of the PEP-II Transverse Coupled–bunch Feedback System

نویسنده

  • J. M. Byrd
چکیده

We report the results of a computer simulation of the PEPII transverse feedback (TFB) system including single particle transverse beam dynamics and measured RF cavity higher order modes. The simulation addresses issues such as required FB power and gain, noise, bunch offsets, and varying initial bunch conditions. We also summarize a simulation of a proposed mode of operation of the feedback system where selected individual bunches are driven to large amplitudes in order to trim their current.

برای دانلود رایگان 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

Initial Commissioning Results from the Pep-ii Transverse Coupled-bunch Feedback Systems*

Initial commissioning results from the PEP-II transverse coupled-bunch feedback systems are discussed. In particular, the performance of key hardware and coupled-bunch damping results are described in some detail. Beam dynamics related measurements presented include beam transfer functions and selected modal growth and damping rates.

متن کامل

Status of the Pep-ii Transverse Feedback Systems*

The feedback systems for controlling transverse coupled-bunch instabilities in both the high and low energy rings of the PEP-II collider are complete and installed on site. Presently, the high energy ring of the collider is beginning commissioning. The commissioning of the high energy ring transverse feedback system is expected to begin sometime in the next few weeks. Design specifications and ...

متن کامل

Commissioning Experience from PEP-II HER Longitudinal Feedback

The DSP-based bunch-by-bunch feedback system installed in the PEPII high-energy ring (HER) has been used to damp instabilities induced by unwanted higher-order modes (HOMs) at beam currents up to 605 mA during commissioning. Beam pseudospectra calculated from feedback system data indicate the presence of coupled-bunch modes that coincide with a previously observed cavity mode (0-M-2). Bunch cur...

متن کامل

RF Feedback Simulation Results for PEP-II*

A model of the RF feedback system for PEP-II has been developed to provide time-domain simulation and frequency-domain analysis of the complete system. The model includes the longitudinal beam dynamics, cavity fundamental resonance, feedback loops, and the nonlinear klystron operating near saturation. Transients from an ion clearing gap and a reference phase modulation from the longitudinal fee...

متن کامل

Beam Diagnostics Based on Time - Domain

A bunch-by-bunch longitudinal feedback system has been used to control coupledbunch longitudinal motion and study the behavior of the beam at ALS, SPEAR, PEP-II, and DA Φ NE. Each of these machines presents unique challenges to feedback control of unstable motion and data analysis. Here we present techniques developed to adapt this feedback system to operating conditions at these accelerators. ...

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

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1995