scholarly journals Smart X-ray beam position monitor system using artificial-intelligence methods for the Advanced Photon Source insertion-device beamlines

1998 ◽  
Vol 5 (3) ◽  
pp. 632-635 ◽  
Author(s):  
Deming Shu ◽  
Hai Ding ◽  
Juan Barraza ◽  
Tuncer M. Kuzay ◽  
Dean Haeffner ◽  
...  
Keyword(s):  
Artificial Intelligence ◽  
Digital Signal Processor ◽  
High Speed ◽  
Digital Signal ◽  
Beam Position ◽  
X Ray ◽  
Front End ◽  
Insertion Device ◽  
Performance Challenges ◽  
Photon Source

At the Advanced Photon Source (APS), each insertion-device (ID) beamline front end has two X-ray beam position monitors (XBPMs) to monitor the X-ray beam position for both vertical and horizontal directions. Performance challenges for a conventional photoemission-type XBPM during operations are contamination of the signal from the neighbouring bending-magnet sources and the sensitivity of the XBPM to the insertion-device gap variations. Problems are exacerbated because users change the ID gap during their operations, and hence the percentage level of the contamination in the front-end XBPM signals varies. A smart XBPM system with a high-speed digital signal processor has been built at the Advanced Photon Source for the ID beamline front ends. The new version of the software, which uses an artificial-intelligence method, provides a self-learning and self-calibration capability to the smart XBPM system. The structure of and recent test results with the system are presented in this paper.

Development of a grazing-incidence insertion device X-ray beam position monitor at the Advanced Photon Source

2010 ◽  
Vol 1 (MEDSI-6) ◽  
Author(s):  
S. H. Lee ◽  
P. Den Hartog ◽  
B. X. Yang ◽  
G. Decker
Keyword(s):  
Incidence Angle ◽  
Grazing Incidence ◽  
Beam Power ◽  
Beam Position Monitor ◽  
Beam Position ◽  
X Ray ◽  
Insertion Device ◽  
Beam Stability ◽  
Peak Heat Flux ◽  
Photon Source

Beam stability is always a concern in synchrotron light source facilities, and accurate and stable X-ray beam position monitors (XBPM) are key elements in obtaining desired user beam stability. Currently, Advanced Photon Source is preparing to upgrade its facility to increase productivity and to provide better beam stability. For better beam stability, a grazing-incidence insertion device X-ray beam position monitor (GRID-XBPM) is proposed for the insertion device beamline front ends instead of the current photoemission-based XBPM. The design and development of the GRID-XBPM are summarized in this paper including the thermal simulation results of the GRID-XBPM. Thermal and stress analyses show that it withstands the 21 kW total beam power and the peak heat flux of 1684 W mm−2 at a grazing incidence angle of 0.80° using a heat transfer coefficient of 0.010 Wmm−2 °C−1.

Status of Taiwan Photon Source front end in National Synchrotron Radiation Research Center

2010 ◽  
Vol 1 (MEDSI-6) ◽  
Author(s):  
I. C. Sheng ◽  
C. K. Kuan ◽  
Y. T. Cheng ◽  
Y. H. Yan ◽  
G. Y. Hsiung ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Beam Current ◽  
Research Center ◽  
Third Generation ◽  
Beam Position Monitor ◽  
Beam Position ◽  
Front End ◽  
Insertion Device ◽  
Radiation Research ◽  
Photon Source

National Synchrotron Radiation Research Center (NSRRC) in Taiwan has initialized the construction of Taiwan Photon Source (TPS) synchrotron accelerator project. This 3 GeV, 500 mA beam current third-generation synchrotron accelerator will have a total of seven insertion device beam lines at day 1 after commissioning. That is, there will be one 2 × EPU48, five IU22 and one U5 undulator beamline. Corresponding front end components such as fixed masks, photon beam position monitor, photon absorber, slits and heavy metal shutter have been designed; manufacturing of these subsystems are on the way. Several prototype assemblies are completed, tested and will be reported in this paper.

A Short-Range Millimeter-Wave Detector System

2013 ◽  
Vol 347-350 ◽  
pp. 102-106
Author(s):  
Shu Sheng Peng ◽  
Feng Xu ◽  
Li Wu ◽  
Jian Zhong Xu
Keyword(s):  
Millimeter Wave ◽  
High Speed ◽  
Short Range ◽  
Digital Signal ◽  
Low Noise ◽  
Detector System ◽  
Wave Detector ◽  
Front End ◽  
Noise Amplifier ◽  
Heterodyne Signal

This paper is focused on a millimeter-wave detector system that works at self-heterodyne mode. The detector antenna and MMW front-end are integrated and a weak heterodyne signal is amplified with a low-noise amplifier. After high-speed sampled with a high-speed A/D, digital signal are processed in a FPGA. Some experiment results are shown finally.

scholarly journals Pink-beam focusing with a one-dimensional compound refractive lens

2016 ◽  
Vol 23 (5) ◽  
pp. 1082-1086 ◽  
Author(s):  
Eric M. Dufresne ◽  
Robert W. Dunford ◽  
Elliot P. Kanter ◽  
Yuan Gao ◽  
Seoksu Moon ◽  
...  
Keyword(s):  
Power Density ◽  
Imaging System ◽  
X Rays ◽  
One Dimensional ◽  
X Ray ◽  
Beam Focusing ◽  
Insertion Device ◽  
Refractive Lens ◽  
Low Density Plasma ◽  
Photon Source

The performance of a cooled Be compound refractive lens (CRL) has been tested at the Advanced Photon Source (APS) to enable vertical focusing of the pink beam and permit the X-ray beam to spatially overlap with an 80 µm-high low-density plasma that simulates astrophysical environments. Focusing the fundamental harmonics of an insertion device white beam increases the APS power density; here, a power density as high as 500 W mm−2was calculated. A CRL is chromatic so it does not efficiently focus X-rays whose energies are above the fundamental. Only the fundamental of the undulator focuses at the experiment. A two-chopper system reduces the power density on the imaging system and lens by four orders of magnitude, enabling imaging of the focal plane without any X-ray filter. A method to measure such high power density as well as the performance of the lens in focusing the pink beam is reported.

scholarly journals Detection and control of a gyroscopically induced vibration to improve the balance of a single-wheel robot

2017 ◽  
Vol 37 (3) ◽  
pp. 443-455 ◽  
Author(s):  
Sangdeok Lee ◽  
Seul Jung
Keyword(s):  
Digital Signal Processor ◽  
High Speed ◽  
Balance Control ◽  
A Priori ◽  
Experimental Studies ◽  
Notch Filter ◽  
Digital Signal ◽  
Control Performance ◽  
And Control ◽  
Balancing Control

In this article, an experimental investigation of the detection of a gyroscopically induced vibration and the balancing control performance of a single-wheel robot is presented. The balance of the single-wheel robot was intended to be maintained by virtue of the gyroscopic effect induced from a highly rotating flywheel. Since the flywheel rotates at a high speed, an asymmetrical structure of a flywheel causes an irregular rotation and becomes one of the major vibration sources. A vibration was detected and suppressed a priori before applying control algorithms to the robot. Gyroscopically induced vibrations can empirically be detected with different rotational velocities. The detection of the balancing angle of the single-wheel robot was accomplished by using an attitude and heading reference system. After identifying the vibrating frequencies, a notch filter was designed to suppress the vibration at the typical frequencies identified through experiments. A digital filter was designed and implemented in a digital signal processor(DSP) along with the control scheme for the balance control performance. The performance of the proposed method was verified by the experimental studies on the balancing control of the single-wheel robot. Experimental results confirmed that the notch filter designed following the detection of the flywheel’s vibration actually improved the balancing control performance. A half of the vibration magnitude was reduced by the proposal.

A Polarization Stabilization Control System Based on DSP

2014 ◽  
Vol 631-632 ◽  
pp. 806-810 ◽  
Author(s):  
Qing Xiang Hou ◽  
Xue Guang Yuan ◽  
Yan Gan Zhang ◽  
Jin Nan Zhang
Keyword(s):  
Control System ◽  
Digital Signal Processor ◽  
High Speed ◽  
Particle Swarm Optimization Algorithm ◽  
Low Frequency ◽  
Digital Signal ◽  
Rf Power ◽  
Swarm Optimization ◽  
Modified Particle Swarm Optimization ◽  
Stabilization Control

A polarization stabilization control system based on digital signal processor (DSP) is proposed in this paper. The system uses low frequency radio frequency (RF) power as control signal for polarization stabilization, and it does not need high-speed circuit to track fast polarization change. Modified particle swarm optimization algorithm is utilized and the effectiveness of polarization stabilization control is experimentally verified.

scholarly journals Decimation of Delta-Sigma-Modulated Signals Using a Low-Cost Microcontroller

2021 ◽  
Author(s):  
Markeljan Fishta ◽  
Franco Fiori
Keyword(s):  
Digital Signal Processor ◽  
High Speed ◽  
Low Cost ◽  
Digital Signal ◽  
Experimental Tests ◽  
General Purpose ◽  
Data Conversion ◽  
Clock Frequency ◽  
Main Challenge ◽  
Modulated Signals

Abstract$$\varDelta \varSigma $$ Δ Σ analog-to-digital converters (ADCs) are largely used in sensor acquisition applications. In the last few years, standalone $$\varDelta \varSigma $$ Δ Σ modulators have become increasingly available as off-the-shelf parts. To build a complete ADC, a standalone modulator has to be paired with some advanced elaboration unit, such as a field programmable gate array (FPGA) or a digital signal processor (DSP), which is needed for the implementation of the decimation filter. This work investigates the use of low-cost, general-purpose microcontrollers for the decimation of $$\varDelta \varSigma $$ Δ Σ -modulated signals. The main challenge is given by the clock frequency of the modulator, which can be in the range of a few $$\hbox {MHz}$$ MHz . The proposed technique deals with this limitation by employing two serial peripheral interface (SPI) modules in a time-interleaved configuration. This approach allows for continuous acquisition and elaboration of relatively high-speed, digital signals. The technique has been applied to a case study, and a data conversion system has been practically realized. The performance of the proposed filter is compared to that of a digital filter, present on board a commercial microcontroller, and the results of experimental tests are provided.

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