skip to main content

Title: A digitizer based compact digital spectrometer for ion beam analysis using field programmable gate arrays and various energy algorithms

We report on the implementation of a compact multi-detector fully digital spectrometer and data acquisition system at a nuclear microprobe for ion beam analysis and imaging. The spectrometer design allows for system scalability with no restriction on the number of detectors. It consists of four-channel high-speed digitizer modules for detector signal acquisition and one low-speed digital-to-analog converter (DAC) module with two DAC channels and additional general purpose inputs/outputs to control ion beam scanning and data acquisition. Each digitizer module of the spectrometer provides its own Field Programmable Gate Array (FPGA) as digital signal processing unit to analyze detector signals as well as to synchronize the ion beam position in hard real-time. With the customized FPGA designs for all modules, all calculation intensive tasks are executed inside the modules, which reduces significantly the data stream to and CPU load on the control computer. To achieve an optimal energy resolution for all detector/preamplifier pulse shape characteristics, a user-definable infinite impulse response filter with high throughput for energy determination was implemented. The new spectrometer has an online data analysis feature, a compact size, and is able to process any type of detector signals such as particle induced x-ray emission, Rutherford backscattering spectrometry, ormore » scanning transmission ion microscopy.« less
Authors:
 [1] ;  [2]
  1. Faculty of Mathematics and Computer Science, University of Leipzig, PF 100920, 04009 Leipzig (Germany)
  2. Department of Physics, University of North Texas, 1155 Union Circle, Denton, Texas 76203 (United States)
Publication Date:
OSTI Identifier:
22220476
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 84; Journal Issue: 8; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ALGORITHMS; BEAM POSITION; CONTROL; DATA ACQUISITION SYSTEMS; DATA ANALYSIS; DESIGN; DIGITAL-TO-ANALOG CONVERTERS; ENERGY RESOLUTION; ION BEAMS; ION MICROSCOPY; PULSE SHAPERS; RUTHERFORD BACKSCATTERING SPECTROSCOPY; SIGNALS; SPECTROMETERS; STREAMS; X RADIATION