Strip-line kicker and fast pulser R&amp;D for the HEPS on-axis injection system

Chen, J.H.; Shi, Hua; Wang, L.; Duan, Zhe; Wang, Ning; Huo, Li‐Hua; Wang, G.W.; Shi, Xuewen; Liu, P.

doi:10.1016/j.nima.2018.12.009

Cited by 16 publications

(5 citation statements)

References 3 publications

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“…In the design of such a 4GLS, DA optimization is a challenging topic, because the strong sextupoles used for chromaticity correction can lead to highly nonlinear beam dynamics [44]. With various efforts [45][46][47][48][49], the DA for the HEPS storage ring is only of the order of a millimeter, while meeting the requirement of on-axis injection [50] to the storage ring.…”

Section: Application To Da Evaluation For a Diffraction-limited Stora...mentioning

confidence: 99%

Machine learning enabled fast evaluation of dynamic aperture for storage ring accelerators

Wan

Jiao

2022

New J. Phys.

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For any storage ring-based large-scale scientific facility, one of the most important performance parameters is the dynamic aperture (DA), which measures the motion stability of charged particles in a global manner. To date, long-term tracking-based simulation is regarded as the most reliable method to calculate DA. However, numerical tracking may become a significant issue, especially when a plethora of candidate designs of a storage ring need to be evaluated. In this paper, we present a novel machine learning-based method, which can reduce the computation cost of DA tracking by approximately one order of magnitude, while keeping sufficiently high evaluation accuracy. Moreover, we demonstrate that this method is independent of concrete physical models of a storage ring. This method has the potential to be applied to similar problems of identifying irregular motions in other complex dynamical systems.

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Section: Application To Da Evaluation For a Diffraction-limited Stora...mentioning

confidence: 99%

Machine learning enabled fast evaluation of dynamic aperture for storage ring accelerators

Wan

Jiao

2022

New J. Phys.

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“…A single bunch is extracted each time, and the kicker pulse width must be shorter than 10 ns to minimize the perturbation to adjacent stored bunches. To this end, high-voltage fast pulsers based on the drift step recovery diode (DSRD) switches pumped by MOSFET inductive adders [11] were developed in-house. In addition, the ELSM is tilted in roll, yaw, and pitch [12] and provides separate paths for the extracted beam and the stored beam.…”

Section: Impact Of Sudden Kicker Failures During Extractionmentioning

confidence: 99%

Using a pre-kicker to ensure safe extractions from the HEPS storage ring

et al. 2021

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The High Energy Photon Source (HEPS) is a 6 GeV diffraction-limited storage ring light source under construction. The swap-out injection is adopted with the depleted bunch recycled via high-energy accumulation in the booster. The extremely high beam energy density of the bunches with an ultra-low emittance (about 30 pm horizontally and 3 pm vertically) and high bunch charges (from 1.33 to 14.4 nC) extracted from the storage ring could cause hazardous damage to the extraction Lambertson magnet in case of extraction kicker failure. To this end, we proposed the use of a pre-kicker to spoil the bunches prior to extraction, significantly reducing the maximum beam energy density down to within a safe region while still maintaining highly efficient extractions. The main parameters of the pre-kicker are simulated and discussed.

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“…During the on-axis swap-out injection process, the full energy booster acts as an accumulating ring. [1][2][3][4][5] At most 10 bunches are injected in the booster ring in one second energy ramping cycle period from 500 MeV to 6 GeV. The beam is injected into and extracted from the booster bunch by bunch with 50Hz repetition rate.…”

Section: Introductionmentioning

confidence: 99%

A pulser R&D for the HEPS booster bumper magnet

Wang,

Chen,

Huo

et al. 2024

J. Phys.: Conf. Ser.

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The High Energy Photon Source (HEPS) is a fourth generation photon source, including a storage ring, a booster ring and a Linac. Due to the small dynamic aperture of the storage ring, a novel on-axis swap-out injection scheme was chosen. Here, the 6GeV booster acts as an accumulating ring during that injection process. To extract 6 GeV beam from the booster before injection into the storage ring, four slow bumper magnets are applied to assist the extraction kicker to accomplish. The bumper pulse magnetic field waveform is a half-sine wave with 1ms pulse bottom width. Depending on the simulation and test, a classic LC resonance circuit topology with IGBT switching in series with fast recovery diodes is adopted. In addition, an energy recycle circuit and capacitor charging circuit are designed, to decrease power loss and reduce the influence on the output pulse current waveform during the capacitor re-charge process. A pulsed power supply prototype has been completed, and the testing results show that the bumper pulser can fully meet the all requirements of HEPS booster high energy extraction system.

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Strip-line kicker and fast pulser R&D for the HEPS on-axis injection system

Cited by 16 publications

References 3 publications

Machine learning enabled fast evaluation of dynamic aperture for storage ring accelerators

Machine learning enabled fast evaluation of dynamic aperture for storage ring accelerators

Using a pre-kicker to ensure safe extractions from the HEPS storage ring

A pulser R&D for the HEPS booster bumper magnet

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