Design of a VXI Module for Beam Phase and Energy Measurements for LEDA
Abstract
Diagnostics systems being designed for the Low Energy Demonstrator Accelerator (LEDA) at Los Alamos include beam synchronous-phase and beam energy measurements. The LEDA machine will utilize a RFQ front end operating at 350 MHz, followed by several 700-MHz DTL accelerating structures. Signals from cavity-field probes and beam-field probes will be down-converted to 2 MHz for phase measurement in VXI modules. Each 2-MHz signal is sampled at 8 MHz with a 12-bit ADC and the resultant data stream is converted into I and Q components which update at a 2-MHz rate. The I and Q signals are then converted to a relative phase measurement. Each VXI module contains four channels of phase measurement hardware which allow for two channels of differential-phase measurement. Low-noise AGC circuits will accommodate signal variations over a 60 dB dynamic range. An on-board calibration system provides a system absolute accuracy of ±1 degree. DSP filtering allows 200-kHz bandwidth measurements to be made with a resolution of <0.1 degrees over most of the dynaminc range.
- Publication:
-
APS Meeting Abstracts
- Pub Date:
- May 1997
- Bibcode:
- 1997APS..PAC..2P63P