Design and implementation of a temperature-compensated corrector magnet power supply for the Taiwan Photon Source

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This article focuses on the current status of the dipole magnet power supply (DMPS) and improvement in the Taiwan Photon Source (TPS) storage ring. The DMPS provides a stable and precise magnetic field for the storage ring operation. Appropriate wiring methods are employed to minimize magnetic field interference across the entire TPS area to meet the demands of high-energy output and overcome the challenges of operating at high currents. The target energy is set at 850 V and 750 A, utilizing a single-pole switching voltage regulator as a high-precision constant current source output structure. The system incorporates a closed control loop that uses the Direct Current Current Transducer (DCCT) to provide current signal feedback to the system. FPGA (Field-Programmable Gate Array) calculates PID (Proportional-Integral-Derivative) compensation values, generating a 2.1 kHz pulse width modulation (PWM) signal to regulate the output current. At the same time, insulated gate bipolar transistor (IGBT) modules are switching components. However, even after several years of practical operation, the stability and performance of the DMPS in the storage ring still require improvements. To enhance long-term output current stability and address peripheral issues, the current TPS utilizes the Beam Orbit Feedback (FOFB) system to suppress and fine-tune the magnetic field and compensate for the impact of temperature drift on the DMPS's output current. This improvement ensures a more stable circulation of the photon beam within the storage ring. By optimizing the temperature control circuit of the main control card, the long-term output current stability has been successfully enhanced to within ± 10 ppm. Simultaneously, the FOFB system reduces uncertainties in adjusting the X-axis beam position, improving beam stability and quality. Furthermore, relevant protective measures have been implemented to ensure robust system operation. Ultimately, these improvement measures have successfully met TPS's stringent requirements for the DMPS, enabling the synchrotron accelerator light source to operate at higher performance levels and fostering advanced scientific research. The results of these upgrades underscore the success of the power supply enhancements, making significant contributions to the overall improvement of the Taiwan Photon Source facility.

Section: Jinst 19 T05015mentioning

confidence: 99%

Optimization stability and performance of the TPS storage ring dipole magnet power supply

Wang,

Liu,

Liu

et al. 2024

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“…In this study, we have selected the Temperature-compensated Corrector Magnet Power Supply (TCMPS) for parallel operation applications. Using isolation current signals within each TCMPS module as the synthesized current feedback signal, we have designed control interface cards for parallel outputs of four and eight modules [9][10][11]. By integrating compensation amounts from external current feedback circuits, this design achieves a maximum output current of ±80 A, combined with 𝑁 + 1 redundancy and modular power supply functions.…”

Section: Jinst 19 T07007mentioning

confidence: 99%

“…Within the TPS infrastructure, quadrupole magnets in the booster ring and dipole and quadrupole magnets in beamlines require bipolar power supplies. The power demand for a single quadrupole magnet can reach up to 120 A, particularly in the case of booster ring quadrupole magnet power supplies [3,4]. Their mission involves using a 3 Hz sinusoidal ramp to increase energy from 150 MeV to 3 GeV while enhancing the magnets in the dipole and quadrupole booster rings.…”

Section: Introductionmentioning

confidence: 99%

Realization of modularized corrector magnet power supply with N+1 redundancy for TPS facilities

Wang,

Liu,

Wong

2024

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This paper delves into implementing multi-module parallel current output using the existing TPS storage ring correction magnet power supply. We have devised a control interface card with N+1 redundancy to facilitate bipolar high-current parallel module output. To achieve this, we have employed various current feedback methods, including external DC Current Transducer (DCCT) and internal module current feedback signals. Following PI compensation, these feedback signals are amalgamated with reference current signals to compute compensation values for each module, which are subsequently disseminated to each Corrector Magnet Power Supply (CMPS) for modulation, thereby enabling closed-loop current control. A single CMPS module can deliver ± 48 V/± 10 A output, while up to eight CMPS modules can be interconnected, yielding a maximum output of ± 80 A. Through numerous experimental measurements, the long-term output current stability remains within 0.6 mA, or 7.5 ppm, with the output current spectrum predominantly maintained within 500 μA. Furthermore, the system boasts N+1 redundancy functionality and bipolar output current characteristics. These exemplary performance attributes underscore the criticality of our design for future applications of TPS magnet power supplies.

“…DC-DC converters employing MOSFETs and GaN FETs as power-switching components. These converters incorporate a DCCT as the feedback element and employ PI compensators to modulate the output current using PWM, forming a switched-mode power supply [7][8][9]. However, zero-crossing current efficiency and harmonic interference generated by such switched-mode power supplies are significant challenges.…”

Section: Jinst 18 T12009mentioning

confidence: 99%

Development of linear power operational amplifier power supply with pre-regulated voltage controller for TPS correction magnets

Wang,

Liu,

Wong

2023

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The Taiwan Photon Source (TPS) is a renowned 3 GeV synchrotron accelerator light source. Over the past decade of successful operation, it has demonstrated outstanding performance, notably in average beam trip downtime, meeting international standards. A continuous regimen of scheduled equipment upgrades has been maintained across all subsystems to ensure ongoing improvement and the preservation of an optimal research facility environment. The central focus of this study revolves around the design and realization of a TPS correction magnet power supply employing Linear Power Operational Amplifiers (LPOA) in conjunction with a pre-regulated voltage controller. The power source predominantly features APEX Corporation's PA05 LPOA, characterized by bipolar output, high internal power dissipation, and wide bandwidth. Additionally, a DC Current Transducer (DCCT) was employed as the current feedback element, integrated with the pre-regulator voltage controller to form a closed-loop current modulation circuit, providing the variable voltage required by the LPOA. Through these measures, we have successfully developed an LPOA power supply unit equipped with a pre-regulated voltage controller for TPS correction magnets. The prototype device boasts a maximum output current of ±10 A, operating at 24 V. Validation through control loop design has led to rapid and stable output current performance. The output current ripple is maintained within 100 μA, with a rise time of 75 μs during step response. During frequency response testing utilizing a 0.1 V disturbance signal, the gain margin resides within -3 dB at an 11.2 kHz bandwidth and the phase margin within -45∘ at a 5.1 kHz range. Long-term output current stability is sustained within ten ppm. Finally, a hardware prototype circuit has been constructed in the power supply laboratory, featuring a ±24 V input voltage and ±10 A output current, achieving a maximum rated power of 240 W.