Table of Content

15 November 2021, Volume 41 Issue s2

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Development of HL-2M power supply system

XUAN Wei-min, WANG Ying-qiao, LI Hua-jun, PENG Jian-fei, LI Wei-bin, LI Qing, HL-M Development Team

2021, 41(s2):  437-442.  DOI: 10.16568/j.0254-6086.2021s2001

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In order to meet the power supply demand of HL-2M tokamak, the power supply system must be developed. The overall power supply demand of HL-2M tokamak is simulated. Considering the existing power supply equipment of HL-2A, an overall configuration scheme of the power supply system, which can meet the power supply demands of both HL-2A and HL-2M tokamak, is given. The research and development of the first domestic 300MVA vertical AC pulse motor generator set, magnet power supplies, high voltage power supplies and power control system are introduced.

Design of 300MVA motor generator on HL-2M tokamak

PENG Jian-fei, XUAN Wei-min, JIANG Bao-gang, WEI Yu-guo, LI Hua-jun, WANG Hai-bing, WANG Ying-qiao

2021, 41(s2):  443-448.  DOI: 10.16568/j.0254-6086.2021s2001

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In order to meet the required power capability and energy of HL-2M tokamak, a new 300 MVA, 
1350 MJ motor generator (MG) has been built. The vertical and horizontal types of the MG have all been 
designed and compared firstly. The vertical MG without flywheel was selected finally because it had enough 
mechanical stability. The MG consists of a vertical-shaft salient pole 6-phase synchronous generator and a coaxial 
8500 kW induction motor and is the first high power one with vertical structure in China. The MG technical 
design mainly includes the mechanical and electromagnetic design. The equivalent models of the designed MG 
were used to simulate the MG start-up and discharge dynamic processes. The results show that the designed MG 
can start-up to rated rotational speed 498rpm in 15min and its electromagnetic parameters can satisfy the 
discharge requirement of the HL-2M special load. The MG pre-design and technical design laid a good foundation 
for the MG successful development and the constructed models can be the auxiliary tools to study the MG work 
control strategy. 


Design and development of slip regulator starting device of 300MVA pulse generator set 

WANG Hai-bing, XUAN Wei-min, PENG Jian-fei, LI Hua-jun, CHEN Yong, XU Li-rong, HU Hao-tian, HE Jin-cheng, HL-M Development Team

2021, 41(s2):  449-452.  DOI: 10.16568/j.0254-6086.2021s2003

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In order to meet the discharge requirements, starting device of slip regulator of the 300MVA pulse 
generator set on HL-2M tokamak is studied. Based on the electrical characteristics of the wound asynchronous 
motor, the set is started by means of an external liquid resistor to the rotor of motor. The size of the liquid 
resistance and the starting time were calculated when different currents were used for starting, and the flow rate 
and capacity of the resistive lye and the flow rate of the cooling water were calculated. The control strategy was 
proposed according to the constant current starting method. The size of the liquid resistance of the slip regulator, 
the volume of the lye tank, the flow rates of the lye and the cooling water were determined. The three-phase liquid 
resistance was measured and adjusted to ensure that the motor current fluctuated very little when the unit was 
started. The commissioning results show that the designed slip adjustment device is feasible and can provide a 
reference for the design of slip adjustment device for high power high voltage motors. 


Design and testing of high voltage inverter speed regulating device for 300MVA pulse generator

WANG Hai-bing, XUAN Wei-min, LI Hua-jun, PENG Jian-fei, HE Jin-cheng, HU Hao-tian, CHEN Yong, KANG Li, HL-M Development Team

2021, 41(s2):  453-456.  DOI: 10.16568/j.0254-6086.2021s2004

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The high voltage inverter, a speed control device for HL-2M 300MVA pulse generator mainly 
consists of input and output parts, power unit, and control part. The commissioning and test operation of the 
high-voltage inverter were carried out. The test shows that its input harmonic content is small and the output 
waveform is also a perfect sine wave. The time from start-up phase to operating speed phase is 16 minutes and the 
re-acceleration time does not exceed 5 minutes, which can meet the experimental discharge requirements. The 
no-load current and rotor time constant were optimized according to the commissioning situation, and the 
performance was optimal at the no-load current of 300A and the rotor time constant of 1.34s. 


Protective device of HL-2M tokamak 300MVA generator set

KANG Li, HU Hao-tian, XU Li-rong, LI Hua-jun, LI Wei-bin, REN Min

2021, 41(s2):  457-460.  DOI: 10.16568/j.0254-6086.2021s2005

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In order to ensure the safe operation of HL-2M tokamak 300MVA vertical shaft generator set, a 
protective device is needed. According to the characteristics of the generator’s multi-branch winding, the 
protective device has total split phase transverse differential protection, complete longitudinal differential 
protection and zero-sequence current type transverse difference protection. Based on pulse working mode of the 
generator set, fast frequency tracking algorithm is used for tracking voltage and current of generator. The 
experiment proves that the protective device can fully meet the safety operation requirements of the generator set. 


Logic protection system of HL-2M magnetic field power supply

HAN Ai-bo, CHEN Yu-hong, WANG Ying-qiao, LI Wei-bin, WANG Ya-li, YAO Lie-ying, SHAO Kui

2021, 41(s2):  461-466.  DOI: 10.16568/j.0254-6086.2021s2006

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In order to ensure the safety of HL-2M magnetic field power supply, its logic protection system is 
designed with a 4-level protection mechanism. Protection and detection devices are installed in the main coil, 
power converter, rectifier transformer, and AC switch cabinet respectively, and the logic protection strategy is 
determined according to the protection level. Through the HL-2M discharge experiments, the feasibility and 
stability of the logic protection system was verified. 


Application of magnetic field power supply in HL-2M tokamak first plasma discharge

LI Wei-bin, CHEN Yu-hong, WANG Ya-li, ZHENG Xue, REN Qin-hua, WU Yi, HAN Ai-bo, WANG Yin-qiao, XUAN Wei-min

2021, 41(s2):  467-471.  DOI: 10.16568/j.0254-6086.2021s2007

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Magnetic field power supply is an important part of first plasma discharge in HL-2M tokamak, 
which is tightly related to the establishment of zero field, plasma breakdown and maintenance as well as 
configuration control. In order to obtain the voltage and current of the power supply required by the first plasma 
discharge, the main circuit, control, measurement and protection of the magnetic field power supply are adjusted, 
respectively. On this basis, a variety of engineering debugging is carried out to ensure that the control and 
protection performance of the magnetic field power supply can meet the requirements of the first plasma 
discharge. During the operation of the magnetic field power supply, the consistency and ripple of the control 
performance and output parameter of the power supply are significantly improved. In this paper, the applications 
of the magnetic field power supply in the debugging and HL-2M first plasma discharge are introduced. 


Design of real-time control system of magnetic field power supply for HL-2M first plasma discharge

REN Qing-hua, LI Wei-bin, WANG Ya-li, WANG Ying-qiao, CHEN Yu-hong, HAN Ai-bo, WU Yi, ZHENG Xue

2021, 41(s2):  472-476.  DOI: 10.16568/j.0254-6086.2021s2008

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 In order to meet the needs of the first plasma discharge parameters of the HL-2M tokamak, a 
real-time control system is designed according to the main circuit topology of the magnetic field power supply. 
Based on NI PXI and CompactRIO controller, the system hardware architecture uses gigabit fiber optic network 
based on shared memory network to transmit data, and calculates locally the control data of central control system 
as the corresponding trigger pulse which is with strong real-time and accuracy. After the verification of the first 
plasma discharge experiment, the real-time control system of magnetic field power supply can fully meet the 
needs of the first plasma discharge. 


Development of the high voltage power supply system for ECRH on HL-2M tokamak

MAO Xiao-hui, LI Qing, XUAN Wei-min, WANG Ying-qiao, XIA Yu-yang, LI Chun-lin

2021, 41(s2):  477-481.  DOI: 10.16568/j.0254-6086.2021s2009

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In order to meet the requirement of auxiliary heating system such as electronic cyclotron 
resonance heating, lower hybrid current driving and neutral beam injection, high voltage power supplies based on 
pulse step modulate technology have been designed to provide high voltage to klystron, gyrotron and neutral 
beam ion source. A high voltage power supply for electronic cyclotron system is analyzed. Multi-winding high 
voltage isolation transformers, solid-state high voltage modulators and a control system are designed in the high 
voltage power supply. A control algorithm is obtained, which makes it easy to adjust the output of high voltage, 
the rising and falling time of high voltage. The experimental results are given to verify the power protection ability, 
the maneuverability and practicability of the power control algorithm. The high voltage power supply meets not 
only the requirements of fast protection of load, but also the design requirements such as the stability of power 
supply. 


HL-2M LHCD system development

BAI Xing-yu, LU Bo, ZENG Hao, WANG Chao, LIANG Jun, CHEN Ya-li, WANG Jie-qiong, FENG Kun

2021, 41(s2):  482-488.  DOI: 10.16568/j.0254-6086.2021s2010

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A 2MW wave source, 2MW transmission lines and a 4MW antenna have been developed for the 
LHCD system on HL-2M tokamak. Four TH2103C1 klystrons are used in the developed 3.7GHz/2MW/3s system, 
where four 500kW transmission lines were built and a 4MW LH antenna was developed, as well as the matching 
power supply, RF source, transmission components, control and protection system, and other auxiliary system 
such as water cooling system, vacuum system, measurement system and data acquisition system et al. were 
developed. 


Plan and research progress on the NBI heating system of HL-2M tokamak

CAO Jian-yong, WEI Hui-ling, GENG Shao-fei, HL-M NBI Team

2021, 41(s2):  489-494.  DOI: 10.16568/j.0254-6086.2021s2011

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In order to meet the requirements of high confinement mode and high parameter experiment on 
HL-2M tokamak, 3 neutral beam injectors (NBI) with total heating power at 15MW are planned. The 1st and 2nd 
NBI beamlines employ positive ion sources. It will be determined by the parameters in later operation periods of 
HL-2M tokamak that whether positive or negative ion sources taken by the 3st NBI beamline. In this paper, the 
layout of all NBI beamlines on HL-2M tokamak and the system design idea are given firstly. Then the designed 
parameter and development progress of the 5MW-NBI beam based on 4 sets of 80kV/45A/5s ion sources are 
reviewed. Based on the brief analysis of the physics and engineering feasibility, the conception design, the 
engineering design and the technological research progress of a 2.5MW-NBI beamline, which uses 2 sets of 
200kV/12.5A/10s negative hot cathode ion sources, are introduced. 


Design and development of ECRH/ECCD system on HL-2M tokamak

HUANG Mei, WANG He, ZHANG Feng, CHEN Gang-yu, LIANG Jun, WANG Jie-qiong, YE Ji-ruo, RAO Jun, SONG Shao-dong, RF Heating Team

2021, 41(s2):  495-499.  DOI: 10.16568/j.0254-6086.2021s2012

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According to heating requirements of HL-2M physical experiments, the electron cyclotron 
resonance heating and current driven (ECRH/ECCD) system with a total power of 8MW was designed. Key 
components, such as wave source, transmission lines and antennas were developed. The 8MW ECRH/ECCD 
system consists of 8 sets of 105GHz/1MW/3s wave source systems, 8 vacuum transmission lines with 63.5mm 
inner diameter and 3 sets of real-time feedback control antennas. At present, key components for ECRH/ECCD 
system were finished and the relative desktop and high-power tests were carried out. The results show the output 
power of the wave source-gyrotron reaches 1MW/3s, which can be transported by the evacuated over-mode 
corrugated circular waveguide transmission line with the vacuity of 102Pa stably with low power loss, and the 
response time of the antennas in full range of injection angle in poloidal direction is less than 50ms. 


Design of magnetic measurement system and experiment results of initial discharge on HL-2M tokamak

ZHANG Jun-zhao, JI Xiao-quan, SUN Teng-fei, LIANG Shao-yong, WANG Ao, LI Jia-xian, YANG Qing-wei

2021, 41(s2):  500-504.  DOI: 10.16568/j.0254-6086.2021s2013

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The physical design of magnetic measurement system for plasma discharge on HL-2M tokamak is 
introduced, including the designs of magnetic probes, magnetic flux loop and current measurement system. 
Through the typical discharge configuration parameters of HL-2M tokamak, the poloidal layout and effective area 
of magnetic probes, the poloidal layout of magnetic flux loop and the mutual inductance of Rogowski coil for 
measuring plasma current were designed. At present, the HL-2M tokamak has completed the first plasma 
discharge. Each subsystem achieves its measurement target.


Design of magnetic measurement integrator system on HL-2M tokamak

CUI Bu-tian, JI Xiao-quan, SUN Teng-fei, LIANG Shao-yong, ZHANG Jun-zhao, WANG Ao

2021, 41(s2):  505-509.  DOI: 10.16568/j.0254-6086.2021s2014

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In fusion experiments, integrator is a fundamental method to recover differential signals, and the 
development of low drift integrator system is an important step in tokamak experiment. A low drift integrator 
system for magnetic measurement on HL-2M tokamak is introduced. By means of analog and digital 
compensation, the drift is reduced and the measurement accuracy between signals is improved. The performance 
test shows that the output drift of the integrator is less than 2mV/15s, and the accuracy of the integral time 
constant is better than 0.3%. The integrator is applied to HL-2M tokamak experiments and meets the requirements 
of magnetic measurement system. 


Development of the CO2 dispersion interferometer on HL-2M tokamak

WANG Hao-xi, LI Yong-gao, LI Yuan, WEN Ruo-nan, YI Jiang, WANG Zai-hong, SHI Zhong-bing, ZHOU Yan

2021, 41(s2):  510-515.  DOI: 10.16568/j.0254-6086.2021s2015

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A CO₂ dispersion interferometer on HL-2M tokamak is designed and commissioned to meet the 
requirement of electron density measurement. The system adopts the dispersion measurement principle based on 
second harmonic generation, and can eliminate the phase error caused by mechanical vibration. The system uses a 
new phase modulation signal modulation, and a data acquisition/analyzing/uploading system is developed. 
Density curve measured by CO₂ dispersion interferometer was in agreement with the curve measured by 
microwave interferometer, density resolution of the system was about 2×10¹⁷m⁻³, and the measuring range was up 
to 10²¹m⁻³. 


Development of HL-2M bolometer system

GAO Jin-ming, DONG Yun-bo, DENG Wei, LU Jie, LIU Yi, MIAO Xiang-gan

2021, 41(s2):  516-521.  DOI: 10.16568/j.0254-6086.2021s2016

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HL-2M bolometer system was designed and optimized with the absolute extreme ultraviolet 
(AXUV) diode arrays, and 16-channel AXUV linear arrays was used as the diagnostic detectors. In order to meet 
the physical requirements, 176 lines of sight were designed within one poloidal section of the torus, and the 
geometrical arrangement of the arrays was optimized by coverage mapping and tomographic reconstruction test. 
Phantom simulation showed that the tomography methods can make reasonable reconstructions of the plasma 
emission profiles from the measurement of about 176 lines of sight. In the HL-2M first plasma operation, one 
AXUV array was installed on the midplane and got reasonable results. 


Design of the preamplifier of soft X-ray system on HL-2M tokamak

DONG Yun-bo, LIU Yi, FU Bing-zhong, GAO Jin-ming, DONG Guan-qi, DENG Wei

2021, 41(s2):  522-526.  DOI: 10.16568/j.0254-6086.2021s2017

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The design of soft X-ray (SXR) system for the HL-2M tokamak is discussed in detail, including 
the physical demand of HL-2M SXR system, the main parts of the system, the key processes, technical 
development, and so on. According to the characteristics of the device (such as high temperature baking, lack of 
vacuum chamber space, etc.), a high-speed broadband amplifier with very low offset voltage and ultra-low bias 
current is used in the preamplifier design, to reduce the dark current and noise. It makes the system suitable for 
long-distance transmission of photoelectric preamplifier. Thus, the installation of preamplifier outside the vacuum 
chamber is realized for the first time. This preamplifier will greatly enhance the reliability of the whole system 
under high temperature baking conditions.


Development of the preliminary vacuum ultraviolet spectroscopy on HL-2M tokamak

ZHANG Kai, ZHENG Dian-lin, DONG Chun-feng, SUN Ping, FENG Lei, SHI Zhong-bing

2021, 41(s2):  527-532.  DOI: 10.16568/j.0254-6086.2021s2018

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HL-2M vacuum ultraviolet (VUV) spectral diagnostic system is developed based a combination of 
multiple Seya-Namioka spectrometers, each with an exchangeable grating. Due to an optimization in gratings, the 
wavelength coverage of the whole spectral system is 300Å to 3000Å with temporal resolution better than 1µs. 
After structural design and fabrication, spectral calibration and commissioning, a single channel VUV 
spectrometer was successfully set up in HL-2M tokamak, viewing horizontally from a midplane port. Spectral 
lines of impurity species (C, O, N) were observed in HL-2M first plasma discharges by the spectrometer, which 
showed excellent signal-to-noise ratio and high sensitivity. 


Development of solid state sub-millimeter wave interferometer on HL-2M tokamak

DENG Wei-chu, SHI Zhong-bing, SHI Pei-wan, YANG Zeng-chen

2021, 41(s2):  533-537.  DOI: 10.16568/j.0254-6086.2021s2019

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A solid state submillimeter wave heterodyne interferometry system and a phase processing method 
based on all phase Fast Fourier Transform (apFFT) are developed to measure electron density during the HL-2M 
first plasma discharges. This system produces the detection wave with the power above 0.1MW and the frequency 
of 306.9GHz by high order frequency multiplication to low frequency phase locked microwave source via planar 
diode frequency multiplying technology. A numeral algorithm for phase calculation based on apFFT is introduced, 
which is able to obtain phase information from raw signals and alleviate phase jump induced by possible high 
lever density fluctuation. The time resolution for the system is 5μs while the lower and upper limits of electron 
density measurement are1016m−3and 1020m−3 respectively. During the HL-2M initial discharges, the system is 
installed on the mid-plane while interferometric measurement is realized by reflection of the metal inner wall, and 
the line-averaged electron densities have been measured. 


Development of a sweeping-frequency ECE diagnostic on HL-2M tokamak

FANG Kai-rui, YANG Zeng-chen, SHI Zhong-bing, YU Xin, TONG Rui-hai, JIANG Min, HL-M Development Team

2021, 41(s2):  538-543.  DOI: 10.16568/j.0254-6086.2021s2020

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In order to measure the electron temperature profile on HL-2M, a sweeping frequency electron 
cyclotron emission (SECE) system is developed. The system can measure electron temperature of plasma with the 
center toroidal field of 1.4~2.2T. The radial spatial resolution is 2.5cm and the temporal resolution is 1ms by using 
the method of frequency-swept heterodyne radiometer technique. The quasi-optical system at the front of the 
receiver is equipped with two-stage metal mirrors. The minimum diameter of a poloidal spot that the system can 
receive is 1.5cm (wave number k_θ<4.2rad·cm^-1) The system covers 33~110GHz bandwidth with 3 voltage 
controlled oscillators (VCO) used as the source of local oscillators (LO), and the intermediate frequency (IF) 
signal is output by mixing in double sidebands. The backend uses high-performance logarithm detector to 
demodulate IF signal for the first time, which can detect the weak signal of -70dBm. The dynamic range of the 
input power reaches 45 dB. During HL-2M experiments, the signals generated by runaway electrons and electron 
cyclotron emission (ECE) in plasma were measured successfully. 


Development of HL-2M overview spectroscopy diagnostic system

WEI Yan-ling, LIU Liang, HE Xiao-fei, HE Xiao-xue, ZHANG Neng

2021, 41(s2):  544-548.  DOI: 10.16568/j.0254-6086.2021s2021

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HL-2M overview spectroscopy diagnostic system consisted of collection optics, optic fibers and 
integrated spectrometer, and extended the observation wavelength range from standard visible band to near 
infrared and near ultraviolet band. The overview spectrometer observes the wavelength range 300~1100 nm. The 
spectral lines of working gas (hydrogen and its isotopes) and intrinsic impurities (carbon, iron, oxygen, et al.) can 
be simultaneous monitored. The integrated spectrometer composed of five compact spectrometers ensured wide 
wavelength coverage and good spectral resolution (0.04~0.19nm⋅pixel⁻¹). The system currently has one spatial 
channel. The best time resolution was 1.05ms, and the system typically ran with a sampling time of 20ms. During 
HL-2M first plasma experiments, the main impurities in the hydrogen plasmas were identified as carbon and 
oxygen, and the characteristics of plasma emission were studied. 


Visible light radiation measurement system for HL-2M first plasma discharges 

HE Xiao-fei, LIU Liang, HE Xiao-xue, ZHANG Neng, WEI Yan-ling

2021, 41(s2):  549-552.  DOI: 10.16568/j.0254-6086.2021s2022

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During the first plasma discharge experiment of HL-2M tokamak, an eight channel visible 
radiation measurement system was used, among which four channels were used to measure Hα, and the rest were 
used for HeⅡ line, CⅢ line, OⅤ line and bremsstrahlung. The system uses new avalanche amplifier diode (APD) 
module and photomultiplier tube (PMT) module as photodetectors. These new photodetectors have the advantages 
of small size, simple operation and high reliability because of their high integration and simple power supply 
mode. During the first plasma discharge activity of HL-2M tokamak, the system provides basic plasma 
information for the control operator. 


Design of HL-2M timing control and data acquisition system

REN Lei-lei, LUO Cui-wen, LIU Pan-le, ZHOU Jian, FAN Ming-jie, HAN Qian

2021, 41(s2):  553-558.  DOI: 10.16568/j.0254-6086.2021s2023

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Based on FPGA and ieee1588PTPv2 protocol, HL-2M timing control system is designed to 
provide trigger for the measurement and control system at precise time. The client/server dual-mode management 
is applied in the data acquisition system. In HL-2M first plasma discharge experiment, the test results showed that 
the time sequence control and acquisition system had the characteristics of nanosecond precision level trigger, 
strong real-time performance, fast data transmission speed, stable and reliable, convenient deployment and 
management. The timing control and data acquisition systems meet the application requirements of HL-2M first 
plasma discharge experiment. 


Design and implementation of experimental network and data management system for HL-2M tokamak

PAN Wei, LAN Jing-tao, PAN Li, ZHANG Gang, PENG Yuan-yuan, QU Cheng-hai, LIANG Jun, LI Xin-yi, ZHAO Li

2021, 41(s2):  559-565.  DOI: 10.16568/j.0254-6086.2021s2024

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HL-2M network and data management includes experimental network system, data storage and 
backup, experimental database and experimental information management, etc. The network system is the 
supporting framework of the device operation, providing the interconnection channel and signal transmission for 
each sub-system. Data storage and backup system provides data storage management and disaster recovery 
backup for tokamak experiment. The experimental database system provides efficient retrieval, access and 
management for metadata and scientific data. Experimental information management system provides parameter 
configuration management, operation logging and operation duty management for each sub-system of the device, 
which realizes the informatization of experimental operation management and improves the efficiency of 
experimental operation. 


Design and implementation of experiment data analysis and real-time display system for HL-2M tokamak

PAN Li, PAN Wei, LI Yong-ge, ZHANG Xin, LAN Jing-tao, QU Cheng-hai, LUO Cui-wen, HAN Qian, LIANG Jun

2021, 41(s2):  566-571.  DOI: 10.16568/j.0254-6086.2021s2025

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HL-2M experimental data analysis system provides powerful remote signal processing, computing 
and information querying functions. The system adopts advanced multi-layer architecture to realize the remote 
transmission of data that is only requisitioned by a user, and has a wide range of LAN and WAN applications. The 
real-time display system divides data processing and display into multiple tasks and deploys them on multiple 
computers based on load balancing. The system can automatically and efficiently process thousands of signals in 
real time, and display hundreds of key signal curves on multiple large screens. 


Design of the configuration and waveform for HL-2M initial discharge

LI Jia-xian, ZHANG Jin-hua, LI Bo, SONG Xiao, WANG Shuo, XUE Lei, ZHENG Guo-yao, HL-M Development Team

2021, 41(s2):  572-578.  DOI: 10.16568/j.0254-6086.2021s2026

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The circular cross-section limiter configuration and divertor configuration that can be used for the 
initial discharge of HL-2M tokamak are designed with EFIT. The designed field null configuration meets the 
requirements of discharge breakdown conditions, that is, the average stray magnetic field in the field null area 
does not exceed 20 Gauss. By evaluating the discharge volt-second consumption, and using the PF8 coil current to 
compensate the stray magnetic field generated by the eddy current of the vacuum vessel, the self-consistent 
discharge waveforms with the plasma current of 200kA for the limiter configuration and the divertor 
configuration are designed respectively. The discharge waveform was used as the feed-forward waveform for 
HL-2M discharge debugging, and the first plasma experiment with the limiter configuration was successfully 
achieved. 


Preliminary research of HL-2M tokamak operation and control techniques 

LI Bo, SONG Xian-ming, ZHOU Jian, SONG Xiao, JI Xiao-quan, XIA Fan, ZHANG Jin-hua, ZHENG Guo-yao, HL-M Development Team

2021, 41(s2):  579-584.  DOI: 10.16568/j.0254-6086.2021s2027

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This article mainly focused on HL-2M tokamak operation and preliminary plasma control 
experimental results, including plasma discharge scenario design, coil current control，null field test and 
calculation, plasma current and position control. A simplified plasma discharge scenario was adopted to reduce the 
risks of first plasma operation. The coil current control was successfully implemented by setting the PID 
parameters. The first plasma breakdown was successfully achieved by performing a breakdown loop voltage 
higher than 10V and a large area of good null field. Finally, a dedicated plasma control scheme on plasma current 
and radial position are designed and implemented, the plasma duration was increased to more than 200ms,and the 
time to maintain I_p≥100kA exceeds 100ms.The above results demonstrate that HL-2M tokamak operation and 
plasma control technology has been preliminarily tested by experiments.