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High energy resolution (e, 2e) spectrometer data acquisition system is developed and its application

Author: LiuTao
Tutor: ChenXiangJun
School: University of Science and Technology of China
Course: Atomic and Molecular Physics
Keywords: Data acquisition system China University of Science and Technology Detection efficiency Energy resolution Correction method Efficiency correction Detector Spectrometer High-resolution Doctoral Dissertation
CLC: O561.4
Type: PhD thesis
Year: 2007
Downloads: 37
Quote: 0
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Abstract


Detailed exposition of this thesis, the multi-parameter line data acquisition system as well as offline data processing software developed for high-energy resolution (e, 2e) spectrometer. Characteristics measured at the same time for the the spectrometer energy, momentum, successfully developed a set of 8-channel signal acquisition and measurement data acquisition systems, and online software has a good user interface is developed using LabVIEW. New data correction method for the detection efficiency may appear uneven, modify and improve off-line data processing software. The high resolution (e, 2e) spectrometer, Ar atom and the CF2Cl2 molecular measuring, testing the data acquisition system and off-line data processing software as well as the efficiency correction method. The thesis includes the following chapters: Chapter introduces the basic principles of electron momentum spectroscopy, experimental arrangements, as well as studies progress and details we recently developed high-energy resolution (e, 2e) spectrometer on the physical requirements of the data acquisition system. In the second chapter, the main spectrometer online data acquisition system. First, the output signal from the position sensitive detector spectrometer analysis of the spectrometer data acquisition system needs, system design principle. Then describes the acquisition system hardware, software components, and debugging. 8-way signal data acquisition system can handle and meet the measurement maximum acquisition rate of 30K Sample / sec. Finally, the Ar atom experiments the data acquisition system were detected. The test results show that the data acquisition system is working properly, and to meet the experimental needs. In the third chapter, the main spectrometer offline data processing process, including relations calibrated ionization spectroscopy of energy and angle position and momentum spectra obtained. A single Lu efficiency correction experimental data of the unevenness of the detection efficiency, and to accidental coincidence background correction and single triangular background correction of the bottom two modified methods were compared, and drawn two methods applicable range. In the fourth chapter, the use of high-energy distinguish (e, 2e) spectrometer measuring the the CF2Cl2 molecular ionization spectroscopy and momentum distribution of the data acquisition system and data processing software to test, and uncorrected and two correction methods The results obtained were compared. The results show that the data acquisition system work well, the data processing program is reliable, efficiency correction method is feasible. In the fifth chapter, a simple cold engraved experiment not only tested the two-dimensional position sensitive detector position linear quality of the output image, and a correction method for output image \The corrected results were assessed. Be significantly improved by correcting image distortion caused by the \The corrected x direction Nonlinear 0.59% from 2.1% before the correction becomes.

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