The FONT5 Bunch-by-Bunch Position and Angle Feedback System at ATF2
Physics Procedia 37 (2012) 0
An FPGA-based turn-by-turn beam position monitoring system for studying multiple bunch beams in the ATF damping ring
DIPAC 2011 - Proceedings of the 10th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators (2011) 230-232
Abstract:
Instabilities associated with beam-size blow-up have previously been observed with multi-bunch beam in the damping ring (DR) of the KEK Accelerator Test Facility (ATF). A system has been developed to monitor such instabilities, utilising an ATF stripline beam position monitor (BPM) in the DR, and BPM processor hardware designed for the FONT upstream feedback system in the ATF extraction line. The system is designed to record the horizontal and/or vertical positions of up to three bunches in the DR in single-bunch multi-train mode or the head bunch of up to three trains in multi-bunch mode, with a bunch spacing of 5.6 ns. The FPGA firmware and data acquisition software were modified to record turn-by-turn data for up to six channels and 1-3 bunches in the DR. The maximum memory configuration on the FPGA allows 131071 bunch-turn-channels of data to be recorded from a particular machine pulse, and the system has the capability to select only certain turns at a regular interval in which to record data, in order to zoom out and cover the entire period of the damping cycle at the ATF. An overview of the system and initial results will be presented.Status of ground motion mitigation techniques for clic
IPAC 2011 - 2nd International Particle Accelerator Conference (2011) 1048-1050
Abstract:
The Compact Linear Collider (CLIC) accelerator has strong stability requirements on the position of the beam. In particular, the beam position will be sensitive to ground motion (GM). A number of mitigation techniques are proposed - quadrupole stabilisation and positioning, final doublet stabilisation as well as beam-based orbit and interaction point (IP) feedback. Integrated studies of the impact of the GMon the CLIC Main Linac (ML) and Beam Delivery System (BDS) have been performed, which model the hardware and beam performance in detail. Based on the results, future improvements of the mitigation techniques are suggested and simulated. It is shown that with the current design the tight luminosity budget for GM effects is fulfilled and accordingly, an essential feasibility issue of CLIC has been addressed. Copyright © 2011 by IPAC'11/EPS-AG.Status of the CLIC phase and amplitude stabilisation concept
Proceedings - 25th Linear Accelerator Conference, LINAC 2010 (2011) 103-105
Abstract:
In CLIC very tight tolerances exist for the phase and amplitude stability of the main and drive beam. In this paper we present the status of the CLIC beam phase and amplitude stabilisation concept. We specify the resulting tolerances for the beam and technical equipment and compare to measurements.Design and Initial Results of a Turn-by-Turn Beam Position Monitoring System for Multiple Bunch Operation of the ATF Damping Ring
Proceedings of IPAC2011, San Sebastián, Spain (2011) 1398-1398