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[en] In 2017, the luminosity at the VEPP-2000 collider at the Budker Institute of Nuclear Physics SB RAS, Novosibirsk, was increased. In this regard, it was decided to upgrade the trigger system of the CMD-3 detector. For this, the development of a device called the Final Decision Block was started. The task of this unit is to generate the final decision on recording the current event in the detector based on the data received from the Charged and Neutral triggers. In this paper, we present the designed block and tests carried out with it, as well as its integration in the Data Acquisition System of the CMD-3 detector. The test results are presented both at the test bench and directly as a part of the Data Acquisition System of the detector.
[en] Aditya Upgrade Tokamak has provided opportunity to implement indigenously developed 64 channel data acquisition system. The system is portable, compact and does not need any external PC for processing. This data acquisition system is more economic and similar in features to PXI based DAS. It is connected to control server through Ethernet. Since the system is stand alone in itself, it is placed in same rack with signal conditioning system of plasma diagnostic. This arrangement reduces the long cables which earlier used to be 20 meters between DAQ unit and signal conditioning system to 1 meter. This setup improved signal to noise ratio and reduced ground loop problems. We have implemented such 5 system among different diagnostic like Soft-Xray, Bolometer, ECE radiometer, EM diagnostic and Spectroscopy. The five units of 64 channel DAQ are functioning successfully since Aditya upgrade phase-I. The inherent features of the board are 16 bit resolution, programmable pretrigger sample and sampling rate up to 200 kS/s/ch and simultaneous acquisition. The acquisition application is developed in Labview and Linux platform, in SBC. In poster details of system integration, hardware and software architecture and results will be discussed. (author)
[en] The TAIGA-Muon scintillation array is located in the Tunka Valley. It is a part of the single TAIGA experimental complex. Its construction has started in the summer of 2019. By the autumn of 2019, the first three clusters were installed. We describe the design of the TAIGA-Muon array, the data acquisition (DAQ) sistem, reading and control systems.
[en] Various parallel ADC structures with mixers (such as DBI-ADC, ATI-ADC) are attractive structures for broadband high-speed data acquisition systems. However, these structures have inherent disadvantages: the phase difference between subbands in the vicinity of overlapping bands of adjacent subbands causes the system frequency response to deteriorate significantly. The original correction method relies on high-performance circuits and components or correction algorithms that consume a lot of digital resources. This paper proposes a new method of phase difference correction for overlapping frequency bands and proves its effectiveness through experimental results. This method uses the structural characteristics of the acquisition system itself, without additional resources, and ensures that the phase difference does not affect the system SNR.
[en] Every discharge in ADITYA tokamak is initiated with starting of the toroidal field power supply (TFPS) which also generates trigger pulses at ~ 2.4 second, ~ 40mS and ~ 4mS before loop voltage. These three trigger pulses operates/controls/initiates various sub-systems of ADITYA tokamak like gas puffing system, data acquisition system, radio frequency pre-ionization and heating system, plasma position control etc. Hence an appropriate trigger pulse from the three fixed time-stamped trigger pulses originating from the power supplies need to be chosen and manipulated according to the experimental requirements. To facilitate the smooth communication among systems lying in tokamak hall and the power supplies kept at ~30-40m from Tokamak hall, an optical fiber (replacing old electrical cables which are prone to noise pick up and false trigger) based trigger transceiver system with programmable delay setting has been designed, developed and installed in ADITYA. An FPGA based (with integrated microblaze soft processor) trigger and timing control system with remotely programmable delay features through LabVIEW based Graphical User Interface (GUI) has been developed which has replaced old CAMAC system. To measure various plasma parameters, various diagnostics are used. The spectroscopy diagnostic is one of the important diagnostics to know about impurity content in plasma and other plasma parameter like electron and ion temperature, electron density, Z-effective. A chassis based signal conditioning electronics has been developed for spectroscopy diagnostic where signal emanating from Photo Multiplier Tube (PMT) detector is detected. The high voltage control electronics has been designed and developed for biasing PMT detector. A microcontroller based 8 channel standalone controller for 8 Channel compact PMT array for Z-effective measurement has also been developed. The design is equipped with independent bias control of 8 channels of PMT array with potentiometers and displaying control voltage on LCD panel using single 8 channel ADC. A 3U size 4 channel VFC/FVC based analog/digital fiber optic transceiver modules with high voltage isolation for real time feed-back communication of signals like radial plasma position, plasma current, and loop voltage between ADITYA and APPS has been designed and developed. (author)
[en] Data archival storage system of MACE telescope is an indispensable component, which is responsible for archiving and retrieval of huge volume of observation data. An efficient storage solution has been developed considering all the challenges like remote location, high operating altitudes, low atmospheric pressure, limited power etc. Adequate redundancy as well as diversity is incorporated for achieving higher fault tolerance and better serviceability. Data Staging Software has been designed and developed to automate the process of replication of data, space management, health monitoring of storage system and RAID management. In order to avoid vendor lock-in and subsequent support issues a storage system based on standard off-the-shelf commodity hardware and in-house software components has been developed and deployed at telescope site. Provision for preliminary in-situ data analysis and mid-term storage is done at Hanle. The data will be finally archived at BARC centralized storage as Ambar project share for long term storage. A web based application is also developed for Physics community for querying and retrieval of observation event data based on various parameters. Architecture of MACE data archival storage system, software developed for data staging, data retrieval and remote management will be discussed during the talk. (author)
[en] The development of new technologies that incorporate strain sensors for reliable collection of relevant information on the state of civil structures is gaining attention. In this study, an array of 25 printed strain sensors made of inexpensive carbon-based materials is demonstrated. The sensors were incorporated into a flexible substrate with a double-sided copper wiring system. The laboratory tests revealed that the sensors have a gauge factor of 3.27. Moreover, these are highly effective in compensating for temperature variations owing to the full Wheatstone bridge configuration. Two sensor arrays equipped with a wireless data acquisition system that provides automated and remote measurements were deployed on a highway bridge for a five-month-long field test. The collected results revealed the versatility of the printed sensors for various applications within the framework of structural health monitoring (SHM), including the detection and monitoring of defects as well as quantitative analysis of traffic. The sensors demonstrate long-term durability and therefore, the potential for practical application in SHM. (paper)
[en] The data acquisition system of the Alvand tokamak is a very old system of 32 channels. The data capacity of each channel is 2 kilobytes, altogether 64 kilobytes, which store the experimental data of selected channels in binary format. The most important deficiency of this system is the use of the CGA graphic adapter resolution of 320 ×240 pixels of 4 bits in-depth. By considering the old graphical user interface, this deficiency has made displaying the experimental data in more detail impossible. Due to the old software used to display the experimental data, updating to an appropriate graphical environment, that can display the data on a typical modern computer at this laboratory, is necessary. For this purpose, a software package was developed to speed up the data analysis of experiments. The core of this package includes 400 lines and the graphical user interface consists of 3000 lines of Matlab code.
[en] Data archival storage system of MACE telescope is an indispensable component, which is responsible for archiving and retrieval of huge volume of observation data. Instead of deploying a proprietary system, based on some black-box appliance from a commercial vendor, a storage system based on standard off-the-shelf commodity hardware and in-house software components has been developed and deployed at telescope site. An efficient storage solution has been developed considering all the challenges like remote location, high operating altitudes, low atmospheric pressure, limited power etc. Adequate redundancy as well as diversity is incorporated for achieving higher fault tolerance and better serviceability. Data Staging Software has been designed and developed to automate the process of replication of data, space management, health monitoring of storage system and RAID management. A web based application is also developed for Physics community for querying observation event data based on various parameters. MACE data is also synced from data archival server (Hanle) to Ambar projects service (BARC, Trombay) and made available to users as a Network Drive over BARC Intranet. (author)
[en] The dynamic strain characteristics and responses of a low-temperature superconducting (LTS) magnet during excitation and a quench are investigated in the present work. For the strain measurements, strain gauges in the form of a half-bridge circuit comprising cryogenic strain gauges and their dummy resistances are embedded directly within the superconducting magnet structure. A wireless high-speed data acquisition system with a resolution of 1 ms is also used to obtain the strain history of the LTS magnet during operation. The dynamic strain induced by thermal or mechanical disturbances is detected promptly and compared with the transport current and temperature signals recorded during a quench. This indicates that the dynamic strain measured in the LTS magnet can capture a quench feature in a timely manner. For a better understanding of the dynamic strain histories in the magnet, the dynamic strain signals are subjected to spectral analysis during the excitation and pre- and post-quench processes. It is shown originally that several spectral peaks on strain measured are always observed at the onset of a quench. Thus, the dynamic strain characteristics and responses provide a evaluation means of superconducting magnet. (paper)