scholarly journals The cryogenic control system of BEPCII

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Gang Li ◽  
Rui Ye ◽  
Mingjing Sang ◽  
Shaopeng Li ◽  
Zhuo Zhang ◽  
...  
Keyword(s):  
Control System ◽  
Cooling Capacity ◽  
Cryogenic System ◽  
Superconducting Device ◽  
Electron Positron ◽  
Srf Cavities

AbstractThe BEPCII project is for upgrading the Beijing Electron Positron Collider to reach a higher luminosity. The cryogenic system has been firstly designed and deployed in BEPCII, which provides cooling capacity for SRF cavities, SCQ and SSM. The cryogenic control system consists of Siemens PLC for the refrigerator control and “PLC + IOC” for superconducting device control. The BEPCII machine commissioning with beam started in October 2006. This paper describes the design and the development of the cryogenic control system.

PRELIMINARY COMMISSIONING OF SUPERCONDUCTING MAGNETS AND CRYOGENIC SYSTEM OF BEPC II

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3163-3165
Author(s):  
Z. G. ZONG ◽  
L. Q. LIU ◽  
Q. J. XU ◽  
L. Y. XIONG ◽  
L. ZHANG ◽  
...  
Keyword(s):  
High Energy Physics ◽  
Superconducting Magnets ◽  
Cooling Capacity ◽  
High Energy ◽  
Cryogenic System ◽  
Electron Positron ◽  
Superconducting Radio Frequency ◽  
Set Up ◽  
Academy Of Sciences ◽  
Srf Cavities

A helium cryogenic system with cooling capacity of 1 kW at 4.5 K was set up at Institute of High Energy Physics, Chinese Academy of Sciences, Beijing. This helium refrigerating system is dedicated for the cooling of two superconducting radio frequency (SRF) cavities, two interaction region superconducting collision quadrupole (SCQ) magnets, a detector superconducting solenoid magnet (SSM), which are the key items of the upgrade project of Beijing Electron-Positron Collider (BEPC II). Commissioning with the detector and SCQ magnets was carried out, which will be introduced in this paper. The cryogenic system shows very robust as SSM quench. This paper presents the overall status and some test results of superconducting and cryogenic system.

scholarly journals The cryogenic control system of SHINE

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Geyang Jiang ◽  
Qing Ni ◽  
Shuhua Wang ◽  
Jiuce Sun ◽  
Zhengrong Ouyang ◽  
...  
Keyword(s):  
Control System ◽  
High Repetition Rate ◽  
System Structure ◽  
Intense Laser ◽  
Cryogenic System ◽  
Test Facility ◽  
Time Data ◽  
Industrial Control ◽  
Control Loops ◽  
Academy Of Sciences

AbstractThe Shanghai High repetition rate XFEL and Extreme Light Facility (SHINE), an advanced XFEL project, is now being built at Shanghai Advanced Research Institute (SARI), Chinese Academy of Sciences. It includes a hard X-ray free electron laser and a 100 pW intense laser facilities with overall length of 3.1 km. The XFEL part including an 8 GeV LINAC and 3 undulator lines is cooled with forced superfluid and supercritical helium at 2 K/4 K. The cryogenic system of SHINE consists of test facility cryogenic system (TFCS), accelerator cryogenic system (ACCS), and undulator cryogenic system (UNCS). A dedicated control system based on Experimental Physics and Industrial Control System (EPICS) will be built to automate the cryogenic system with process control, PID control loops, real-time data acquisition and storage, alarm handler and human machine interface. It is capable of automatic recovery as well. This paper describes details of control system structure, interfaces, controllers and the integration under EPICS framework.

scholarly journals Renewal of the Control System and Reliable Long Term Operation of the LHD Cryogenic System

2015 ◽  
Vol 67 ◽  
pp. 77-82 ◽  
Author(s):  
T. Mito ◽  
A. Iwamoto ◽  
K. Oba ◽  
S. Takami ◽  
S. Moriuchi ◽  
...  
Keyword(s):  
Control System ◽  
Cryogenic System ◽  
Term Operation

Development of Ultra Fast Cooling Variable Frequency Control System in Hot Strip Mill

2012 ◽  
Vol 442 ◽  
pp. 199-203 ◽  
Author(s):  
Liang Gui Peng ◽  
Yang Gao ◽  
Xian Ming Zhao ◽  
Di Wu ◽  
Zhong Ping Zhang ◽  
...  
Keyword(s):  
Control System ◽  
Frequency Control ◽  
Cooling Capacity ◽  
Hot Strip Mill ◽  
Variable Frequency ◽  
Ultra Fast Cooling ◽  
Hot Strip ◽  
Frequency Control System ◽  
Fast Cooling ◽  
Variable Frequency Control

With advanced high-strength steels and high value-added steels development, it is urgent to innovative run out table cooling line in hot strip mill with flexible cooling capacity to meet products metallurgical requirements of the cooling rate after rolling. The way to increase the cooling capacity is to improve the effect of heat exchange of water forced convection with hot strip. Then to raise the spraying pressure to penetrate the residual water and break the vapor inside it is the most feasible method. So, how to control the variable frequency device providing variable spraying pressure is the object of this study. Firstly, cooling after rolling process requirement under ultra fast cooling was analyzed; secondly, characteristic curves of centrifugal pump and water supply pipeline were tested; then inverter timing control, interlock control, security control and so on were studied. Since online application of the variable frequency control system, the water supply system has been running stably and reliably

Heat Design of Multi-Functional Structure of Electronic Equipment with Material Properties in Control System

2012 ◽  
Vol 625 ◽  
pp. 159-166
Author(s):  
Jun Hui Wu ◽  
Quan Zhou ◽  
Qiang Zhou ◽  
Jie Chen ◽  
Hui Ping Si ◽  
...  
Keyword(s):  
Control System ◽  
Control Unit ◽  
Cooling Capacity ◽  
Thermal Design ◽  
Electronic Equipment ◽  
Functional Structure ◽  
Maximum Temperature ◽  
Thermal Coupling ◽  
Unit Structure ◽  
Fin Spacing

In this paper, the multifunctional structure was designed in electronic equipment of the control system, reducing the weight in the housings of the electronic equipment, wire and cable. The functions of thermal design and dynamic design and protection design were completed by using structure. The qualitative analysis of the center control unit structure model was done. Thermal analysis and the thermal design of the multifunctional electronic equipment structure were finished on the basis of the thermal design principles and attention of the matters. The cooling capacity was increased by fin structure with the cold plate. The modeling analyses of the same multi- functional structure with different fin spacing and height were completed in Icepak. The curves of the maximum temperature for the multi-functional structures corresponding to a group of fin height were got. The high-power MCM chip was placed in the middle of the multifunctional structure, and the remaining low-power chips were distributed around, which can reduce the thermal coupling of the chip, reducing the overall temperature of the multi-functional structure effectively, which has certain theoretical significance to the design of today’s electronic devices.

scholarly journals Design and Performance Test of 2 kW Class Reverse Brayton Cryogenic System

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5089
Author(s):  
Keuntae Lee ◽  
Deuk-Yong Koh ◽  
Junseok Ko ◽  
Hankil Yeom ◽  
Chang-Hyo Son ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Natural Gas ◽  
Performance Test ◽  
Cooling Capacity ◽  
Liquefied Natural Gas ◽  
Cryogenic System ◽  
Operating Pressure ◽  
Power Cables ◽  
Turbo Expander ◽  
Refrigeration Capacity

With the increased commercialization of high-temperature superconducting (HTS) power cables cooled using liquid nitrogen and the use of liquefied natural gas as fuel, the need for large-capacity reverse Brayton cryogenic systems is gradually increasing. In this paper, the thermodynamic design of a reverse Brayton cryogenic system with a cooling capacity of the 2 kW class at 77 K using neon as a refrigerant is described. Unlike conventional reverse Brayton systems, the proposed system uses a cryogenic turbo-expander, scroll compressor, and plate-type heat exchanger. The performance test conducted on the fabricated system is also described. The isentropic efficiency of the cryogenic turbo-expander was measured to be 86%, which is higher than the design specification. The effectiveness of the heat exchanger and the flow rate and operating pressure of the refrigerant were found to be lower than the design specifications. Consequently, the refrigeration capacity of the fabricated reverse Brayton cryogenic system was measured to be 1.23 kW at 77 K. In the future, we expect to achieve the targeted refrigeration capacity through further improvements. In addition, the faster commercialization of HTS power cables and more efficient storage of liquefied natural gas will be realized.

scholarly journals Development of an Air-Cycle Environmental Control System for Automotive Applications

2011 ◽  
Author(s):  
Christopher J. Forster ◽  
Patrick Lemieux
Keyword(s):  
Control System ◽  
Air Conditioning ◽  
High Performance ◽  
Environmental Control ◽  
Cooling Capacity ◽  
Test Stand ◽  
Compressed Air ◽  
Coefficient Of Performance ◽  
Intake Manifold ◽  
Working Fluid

The Reverse-Brayton cycle has been used for aircraft cabin cooling for many decades. However, air-cycle cooling hasn’t been popular in the automotive field yet. This study demonstrates that air-cycle technology can provide sufficient cooling for certain applications. The primary focus is a novel forced induction engine control system, where compressor bleed is used both to provide engine boost control and air-conditioning. The bleed-air drives an air-cycle machine (ACM) consisting of typical automotive components: a turbocharger, heat exchanger, and ducting. The components of an ACM system are lightweight and compact compared to those of a typical vapor compression system; both qualities are critical in high performance applications, where such a system seems to make most sense. The ACM was tested first on a test stand and then directly on an engine, in a bootstrap-cycle configuration. The turbocharged test engine’s intake manifold pressure was controlled by bleeding air from the outlet of the engine’s intercooler and feeding the ACM compressor inlet. Once the compressed air was supplied to the ACM it was further compressed by the ACM, cooled by the secondary intercooler, and expanded through the ACM turbine. The engine’s turbocharger was resized to compensate for the increased air flow during ACM operation. The results show that a dry-air-rated (DAR) coefficient of performance (COP) of 0.73 and a DAR cooling capacity of 1.5 tons are possible on a test stand, and a DAR COP of 0.56 and a DAR cooling capacity of 0.72 tons are possible on-engine. The data available from the on-engine testing was limited to lower ACM pressure ratios due to a bearing failure before full testing was complete; performance would likely increase with higher inlet pressures, as shown by the compressed air test stand results. The test results strongly suggest that continued development and in-vehicle testing will provide adequate air-conditioning and engine performance, using only the most benign and environmentally friendly working fluid: air.

A controller for safe, convenient operation of LaB6 emitters on electron-beam instruments

1983 ◽  
Vol 41 ◽  
pp. 408-409
Author(s):  
W. J. Abramson ◽  
H. W. Estry ◽  
L. F. Allard
Keyword(s):  
Electron Beam ◽  
Control System ◽  
Thermal Shock ◽  
Appropriate Care ◽  
Electron Guns ◽  
Tungsten Filaments ◽  
Order Of Magnitude ◽  
Main Components

LaB6 emitters are becoming increasingly popular as direct replacements for tungsten filaments in the electron guns of modern electron-beam instruments. These emitters offer order of magnitude increases in beam brightness, and, with appropriate care in operation, a corresponding increase in source lifetime. They are, however, an order of magnitude more expensive, and may be easily damaged (by improper vacuum conditions and thermal shock) during saturation/desaturation operations. These operations typically require several minutes of an operator's attention, which becomes tedious and subject to error, particularly since the emitter must be cooled during sample exchanges to minimize damage from random vacuum excursions. We have designed a control system for LaBg emitters which relieves the operator of the necessity for manually controlling the emitter power, minimizes the danger of accidental improper operation, and makes the use of these emitters routine on multi-user instruments.Figure 1 is a block schematic of the main components of the control system, and Figure 2 shows the control box.

Sign in / Sign up

Export Citation Format

Share Document