Automatic data archiving and visualization at HLS-Ⅱ

The control system of Hefei Light Source II(HLS-Ⅱ) is a distributed system based on the experimental physics and industrial control system(EPICS). It is necessary to maintain the central configuration files for the existing archiving system. When the process variables in the control system are added, removed, or updated, the configuration files must be manually modified to maintain consistency with the control system. This paper presents a new method for data archiving, which realizes the automatic configuration of the archiving parameters. The system uses microservice architecture to integrate the EPICS Archiver Appliance and Rec Sync. In this way, the system can collect all the archived meta-configuration from the distributed input/output controllers and enter them into the EPICS Archiver Appliance automatically. Furthermore, we also developed a web-based GUI to provide automatic visualization of real-time and historical data. At present,this system is under commissioning at HLS-Ⅱ. The results indicate that the new archiving system is reliable and convenient to operate. The operation mode without maintenance is valuable for large-scale scientific facilities.     

Brief Report on the Model Calculation of n ~(12)C below 20 MeV

Introduction A new model was developed for calculating nuclear data of light nuclei, with which the cross sections and double differential cross sections of outgoing neutron of n ~9Be were calculated. The results reproduce the experimental data successfully. Now we go on a step further to calculate the data for n ~(12)C to test this new model.     

Construction and Implementation of the Online Data Analysis System on EAST

In order to obtain diagnostic data with physical meaning,the acquired raw data must be processed through a series of physical formulas or processing algorithms.Some diagnostic data are acquired and processed by the diagnostic systems themselves.The data processing programs are specific and usually run manually,and the processed results of the analytical data are stored in their local disk,which is unshared and unsafe.Thus,it is necessary to integrate all the specific process programs and build an automatic and unified data analysis system with shareable data storage.This paper introduces the design and implementation of the online analysis system.Based on the MDSplus event mechanism,this system deploys synchronous operations for different processing programs.According to the computational complexity and real-time requirements,combined with the programmability of parallel algorithms and hardware costs,the OpenMP parallel processing technology is applied to the EAST analysis system,and significantly enhances the processing efficiency.     

A Possible New Data Archive Format for EAST

A new possible data archive format for storing huge amounts of data for EAST control anddata acquisition system is presented. This new general-purpose data archive format is network-transparent, i.e, machine-independent and has been implemented in terms of XDR （eXternal Data Representation）. We test this format by using EFIT （Equilibrium Fitting） code on different operation systems, namely Linux and Windows, different processors, namely Sun and Pc, and different programs, namely in Fortran and C language. It can be easily used by different computers and different programming languages.     

The control and monitor system for the BESⅢ ETOF/MRPC beam test

A test system is developed for the BESIII ETOF/MRPC beam tests of data acquisition, environment monitoring and automatic control. The software framework is based on the CAMAC bus, VME bus and Serial Port,which are responsible for communications with the detectors. The monitor system works well in the beam test.     

Study on fine quartz pre-dose techniques

When using the pre-dose technique in ceramic dating,it is essential to add a calibration dose and to eliminate the background dose.For doing this measurement the sample requires multiple activation following multiple administration of a test dose to induce simulated “ancient” thermoluminescence(TL).However,the procedures introduce many factors that are difficultly corrected.This paper compares existing two kinds of measurement procedures and proposes a new procedure involving single activation following a single test dose administration.AN experiment using the single activation procedure is carried out with natural fine quartz where the results obtained exhibit only 0.07 relative error.It appears that this new procedure increases the precision of the ancient TL measurement by about 0.04 and 0.11 over those of existing two kinds of procedures.In addition this method can give realistic values in TL dating for relatively “young” samples aged tens to hundreds of yesrs where the standard high temperature TL method is relatively insensitive.     

Design and implementation of accelerator control monitoring system

IMPCAS has constructed and currently manages a large number of accelerator facilities. However, the current accelerator monitoring methods are unable to satisfy all of the device requirements. The accelerator control monitoring system(ACMS) was created and established to provide an efficient and accurate accelerator control monitoring system. It enables automatic alerting of problems with accelerator control systems and infrastructure. It utilizes a big data distributed stream processing engine ...     

New Geiger-Nuttall law of odd-Z nuclei and long-lived island beyond the stable line

Recently, we analyze the a-decay data of even-Z nuclei and propose the new Geiger-Nuttall law where the effects of the quantum numbers of a-core relative motion are naturally embedded in the law [Physical Review C 85, 044608 （2012）].In this paper, we firstly test whether the new law without any change of parameters can be applied to the a-decays of odd-Z nuclei which are more complicated than those of even-even nuclei. Then the nuclear shell effect around N=126 is analyzed for very proton-rich nuclei with Z=85-92 based on the data of a-decay energies and half-lives. A long-lived island beyond the stable line is proposed where the half-lives of nuclei on this island are abnormally long. The mechanism of the appearance of the island and its significance to other mass ranges are discussed.     

Stopping powers of energetic electrons penetrating condensedmatter——theory and application

In this review article, the motivation of studying inelastic energy loss for energetic electrons penetrating through matter and the corresponding technological importance have been outlined. The theoretical development and method for the calculation of stopping powers are described. The stopping power data tables for a group of polymers and bioorganic compounds are presented, and the application aspects of the stopping power data are briefly discussed.     

ADC evaluation boards design and test framework for LCLS-Ⅱ precision receiver

In the low-level RF control field,ADC acquisition accuracy and noise set the boundary of our control ability,making it important to develop low-noise acquisition systems.From the design to test stage,all the noise terms should be understood and characterized.The specific need addressed here is the precision acquisition system for the second Linac Coherent Light Source(LCLS-Ⅱ),led by SLAC National Accelerator Laboratory.Test circuit boards for the LTC2174 and AD9268 ADCs are designed and fabricated by LBNL.An ADC test framework based on FPGA evaluation board to assess performance has been developed.The ADC test framework includes both DSP(Digital Signal Processing) firmware and processing software.It is useful for low-level RF control and other synchronization projects.Investigating the clock jitter between two channels give us an understanding of that noise source.Working with the test framework,the raw ADC data are transferred to a computer through a Gigabit Ethernet interface.Then short-term error signal can be calculated based on a sine wave fit.By changing low-pass filter bandwidth,relative long-term performance can also be obtained.Amplitude jitter and differential phase jitter are the key issues for ADCs.This paper will report the test results for LTC2174 and AD9268 chips.The integral amplitude jitter is smaller than 0.003%,and the integral phase noise is smaller than 0.0015°(measured at 47 MHz RF,100 MHz clock,bandwidth 1 Hz to 100 kHz) for both ADC chips.     

THE MEASUREMENT OF SLIGHT WEAR OF ENGINEERING PLASTIC COMPOSITES USING NEUTRON ACTIVATION ANALYSIS

In this paper, an experimental method was described for measuring very slight wear of polymer by using neutron activation analysis (NAA). By means of adopting appropriate neutron flux suitable experimental parameters and measuring technique, the method was performed under the condition without any effect upon the mechanical properties of wearing. The sensitivity of the wear measurements reached the order of magnitude of 10-7g for engineering plastics containing about 1 wt% of zinc. The comparison could be made rapidly between different materials with different resistance to wear. The results were free from the influence of vibration of test systems, elastic deformation of materials, media and moisture absorption, and etc. Combined with autoradiograph, the present technique can be used to investigate the backtransfer of ground debris of metallic fillers from the counter part to the specimen. A multifunctional plane wear testing machine was set up for obtaining wear data and friction coefficient. The present work provides a new, rapid and sensitive measuring technique and also a screening method for the wear of polymers.     

Statistical Behaviors of Quantum Spectra in Superheavy Nuclei

Recently, the statistical features of spectra for the deformed space explored by the fission have beenstudied and a new insight into fission and hyperdeformation has been given. The extension of this kind ofinvestigations to superheavy nuclear systems is a very valuable. In this paper we study the nearestneighbor level-spacing distributions of superheavy systems based on mean field models.The     

Design of data transmission for a portable DAQ system

Field Programmable Gate Array （FPGA）, combined with ARM （Advanced RISC Machines） is increasingly employed in the portable data acquisition （DAQ） system for nuclear experiments to reduce the system volume and achieve powerful and multifunctional capacity. High-speed data transmission between FPGA and ARM is one of the most challenging issues for system implementation. In this paper, we propose a method to realize the high-speed data transmission by using the FPGA to acquire massive data from FEE （Front-end electronics） and send it to the ARM whilst the ARM to transmit the data to the remote computer through the TCP/IP protocol for later process. This paper mainly introduces the interface design of the high-speed transmission method between the FPGA and the ARM, the transmission logic of the FPGA, and the program design of the ARM. The theoretical research shows that the maximal transmission speed between the FPGA and the ARM through this way can reach 50 MB/s. In a realistic nuclear physics experiment, this portable DAQ system achieved 2.2 MB/s data acquisition speed.     

A distributed control system for picosecond accelerator at SINAP

The picosecond accelerator （PA） is a low energy electron linear accelerator facility under commissioning, which is built for the experiment of ps level pulse radiolysis in Shanghai Institute of Applied Physics （SINAP）. A practical distributed DA＆C system for this facility has been developed. In view of the upgrading-ability and maintainability of the control system and controlled devices, Advantech distributed intelligent DA＆C products are adopted into the control system. ADAM 5000/TCPs with the protocol of Modbus/TCP are employed to accomplish data acquisition and device control. The PC-compatible programmable logic controller, ADAM-5511. is also adopted to handle the interlocks and the emergency events. On the software side, the integrated software package Kingview V6.5, which fi＇iendly supports all Advantech products, has been used to develop the upper layer control logic and process the data. This paper describes the control system design and system architecture, The intelligent ADAM controllers and the software platform are also discussed in detail.     

Recent Evaluation of Some Dosimetry Data for Reactor Application

Knowledge of dosimetry data is very useful in reactor research and application. For reactor dosimetry, radiation safety, environmental and material damage in fission and fusion engineering, more accurate data are required and it is necessary to identify and correct several differences and discrepancies in the existing dosimetry cross sections from different laboratories. The evaluated dosimetry data are recommended in this work on the basis of the recent experimental data, especially the new measured results at CIAE, and compared with other evaluated data.     

Measurement of 8—25keV electron impact K—shell ionization cross sections of Cu and Co elements

The influence of substrate of thin targets on ionization cross sections has been corrected by a new method based upon the bipartition model of electron transport.The measured cross sections for Cu element are in good agreement with existing experimental data and those produced by the empirical formula of Green and Cosslett.Cross sections for Co element are measured for the first time.     

An Alternative Empirical Formula for Positive Corona Discharge I-V Characteristics in Point-to-Plate Electrode Geometry

Experimental data are presented for a study on the dependence of the I-V character- istics of the corona discharge on pressure and electrode spacing using point-to-plane electrode con- figuration. These experimental data are obtained by a fast, automatic computer data-acquisition system. The data are used to suggest an alternative dimensionally self-consistent empirical equa- tion for the parameterization of the I-V curves. The formula eliminates the need for any prior assumptions concerning the inception voltage, as is customary in this type of work.     

Development of the Data Processing and Analysis System Framework for ICF Experiments

An idea is presented about the development of a data processing and analysis system for ICF experiments, which is based on an object oriented framework. The design and preliminary implementation of the data processing and analysis framework based on the ROOT system have been completed. Software for unfolding soft X-ray spectra has been developed to test the functions of this framework.     

Development of Data Processing Software for NBI Spectroscopic Analysis System

A set of data processing software is presented in this paper for processing NBI spectroscopic data.For better and more scientific managment and querying these data,they are managed uniformly by the NBI data server.The data processing software offers the functions of uploading beam spectral original and analytic data to the data server manually and automatically,querying and downloading all the NBI data,as well as dealing with local LZO data.The set software is composed of a server program and a client program.The server software is programmed in C/C++under a CentOS development environment.The client software is developed under a VC6.0 platform,which offers convenient operational human interfaces.The network communications between the server and the client are based on TCP.With the help of this set software,the NBI spectroscopic analysis system realizes the unattended automatic operation,and the clear interface also makes it much more convenient to offer beam intensity distribution data and beam power data to operators for operation decision-making.