Name

EAST Auxiliary heating high-voltage

power supply system

Research Group

Auxiliary heating high-voltage

power supply

System Leader

Name

Zhang Jian

TEL

0551-65591411

E-mail

zhangj@ipp.ac.cn

System

Introduction

EAST Auxiliary heating high-voltage power supply (HVPS) system is composed of four types of -50kV~-100kV DC high-voltage power supply system, which supply LHCD system, ECRH system and NBI system. The total installed capacity is about 80MW, which provides a strong guarantee for EAST high-parameter and high-performance operation.

1)     2.45GHz-4MW Low Hybrid Current Drive (LHCD) HVPS system.

2)     4.6 GHz-6MW Low Hybrid Current Drive (LHCD) HVPS system.

3)     140GHz-4MW Electron Cyclotron Resonance Heating (ECRH) HVPS system.

4)     80keV-8MW Neutral Beam Injection (NBI) HVPS system.

Principle Diagram

Schematic diagram of the main-loop for    Schematic diagram of the main-loop for

2.45GHz LHCD-HVPS                 4.6GHz LHCD-HVPS

Schematic diagram of the main-loop for    Schematic diagram of the main-loop for

140GHz ECRH-HVPS                 80keV NBI-HVPS

System Layout

1)       2.45GHz LHCD-HVPS: HVPS steel-platform in 8-1 Hall.

2)       4.6GHz LHCD-HVPS: Auxiliary heating building floor 7.

3)       140GHz ECRH-HVPS: HVPS steel-platform in 8-1 Hall.

4)       80keV NBI-HVPS: Auxiliary heating building floor 1&2；

System State

The construction tasks of the four sets of high voltage power supply system have been completed and so the four HVPS system have joined in the EAST physics experiment smoothly. During the EAST experiment, the system runs safely and stably with low failure rate，and during EAST maintenance, various maintenance work will be carried out to improve the reliability of the system.

Parameter

Subsystem

No.

Subsystem Name

Function

Leader

TEL

1

2.45GHz LHCD-HVPS

Microwave energy source for 2.45GHz LHCD

Liu Xiaoyan

0551-65593249

2

4.6GHz LHCD-HVPS

Microwave energy source for 4.6GHz LHCD

Guo Fei

0551-65591411

3

140GHz ECRH-HVPS

Microwave energy source for 140GHz ECRH

Zhang Jian

0551-65591411

4

80keV NBI-HVPS

Beam energy source for 80keV NBI

Pan Shengmin

0551-65590393

Main construction tasks and renovation contents

No.

Subsystem Name

Main construction tasks and renovation contents

1.

2.45GHz LHCD-HVPS

n  In 2001, four sets of 33kV/40A SCR phase-controlled power supply were built, which successively served the HT-7  Tokomak and EAST Tokomak.

n  In 2011, four sets of 20kV/50A PSM power supplies were added to form four 50kV/50A power supplies in series with the phase-control unit to meet the requirements of 2.45GHz -4MW LHCD on EAST.

n  In 2018, four sets of 33kV/40A SCR phase-controlled power supply parts were transformed into PSM units, which reached 50kV/50A overall and improved the power supply operation efficiency.

2.

4.6GHzLHCD-HVPS

n  In 2012, four sets of 50kV/75A PSM high voltage power supply were built to serve 4.6GHz-6MW LHCD on EAST.

n  In 2014, in order to deal with the occasional low-order harmonic interference on the gird side, high-frequency PSM has been modified to improve the power regulation capability.

3.

140GHz ECRH-HVPS

n  In 2013, the first set of 70kV/80A PSM high voltage power supply was built to provide cathode high voltage for GYCOM 1# gyrotron.

n  In 2015, the second set of 70kV/80A PSM high voltage power supply was built to provide cathode high voltage for GYCOM 3# gyrotron.

4

80keV NBI-HVPS

n  In 2008, the construction of 100kV/100A high-voltage power supply test platform was completed and put into NBI, LHCD test bench experiment and test operation.

n  In 2012, 2 sets of 80kV/70A NBI HVPS for window A-NBI were built and put into EAST experiment.

n  In 2015, 2 sets of 80kV/70A NBI HVPS for window F-NBI were built and put into EAST experiment.

n  In 2017, 4 sets of oil-immersed gradient resistors were transformed into air-cooled structures, which reduced the maintenance cost and difficulty of the system.

n  In 2018, the 110kV oil-immersed isolation transformer safety protection and installation project of EAST auxiliary heating system was completed. Firewalls were added to 4 indoor oil-immersed transformers to improve the safety and reliability of the system.