A5101417357- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Particle Accelerators and Free-Electron Lasers
- Plasma Diagnostics and Applications
- Gyrotron and Vacuum Electronics Research
- Ion-surface interactions and analysis
- Electrostatic Discharge in Electronics
- Nuclear physics research studies
- Physics of Superconductivity and Magnetism
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Chemical Synthesis and Analysis
- Glycosylation and Glycoproteins Research
- X-ray Spectroscopy and Fluorescence Analysis
- Optical Coherence Tomography Applications
- Ionosphere and magnetosphere dynamics
- Silicon Carbide Semiconductor Technologies
- Radiopharmaceutical Chemistry and Applications
- Particle physics theoretical and experimental studies
- Ocular Surface and Contact Lens
- Photodynamic Therapy Research Studies
- Quantum Chromodynamics and Particle Interactions
- Photocathodes and Microchannel Plates
- Radiation Therapy and Dosimetry
Lawrence Berkeley National Laboratory
2013-2025
Chinese University of Hong Kong
2024
Institute of Modern Physics
2010-2020
Chinese Academy of Sciences
2010-2020
Assumption University
2018
Institute of Electrical Engineering
2015
University of Chinese Academy of Sciences
2015
Berkeley Air Monitoring Group (United States)
2000-2009
The superconducting electron cyclotron resonance ion source with advanced design in Lanzhou (SECRAL) is a superconducting-magnet-based (ECRIS) for the production of intense highly charged heavy beams. It one best performing ECRISs worldwide and first ECRIS built an innovative magnet to generate high strength minimum-B field operation heating microwaves up 24--28 GHz. Since its commissioning 2005, SECRAL has so far produced good number continuous wave intensity records beams, which recently...
The development of superconducting ECR source with higher magnetic fields and microwave frequency is the most straight forward path to achieve beam intensity charge state performance. SECRAL, a third generation ion source, designed for 24-28 GHz operation an innovative magnet configuration sextupole coils located outside three solenoids. SECRAL at 24 has already produced number record intensities, such as 40Ar12+ 1.4 emA, 129Xe26+ 1.1 129Xe30+ 0.36 209Bi31+ 0.68 emA. SECRAL-II, upgraded...
The spectral temperature T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">s</sub> obtained from bremsstrahlung spectra emitted electron cyclotron resonance (ECR) ion sources (ECRISs), in which the plasma is confined a minimum-B magnetic field, used as relative indication of hot electrons. Past measurements taken on ECRISs indicate that strongly dependent field gradient at zone or (B xmlns:xlink="http://www.w3.org/1999/xlink">min</sub> /B...
The Heavy Ion Research Facility in Lanzhou (HIRFL) is a multi-disciplinary research facility that provides heavy ion beams for physical, biomedical and material sciences. It major academic of China one the world's important centers nuclear physics accelerators. was built step by at Institute Modern Physics (IMP) over half century. first cyclotron with great assistance from former Soviet Union 1960s, newest linear accelerator tested successfully 2019. HIRFL can provide proton to Uranium...
Third-generation electron cyclotron resonance ion sources (ECRISs) have relied on a combination of sextupole and solenoid fields from Nb-Ti superconductors to produce the magnetic required for 28 GHz operation. The VENUS source at Lawrence Berkeley National Laboratory (LBNL) was first third-generation optimized operation, since that time similar design has been adopted other heavy-ion facilities such as RIKEN, GANIL FRIB. These utilize sextupole-in-solenoid represent high-field limit this...
Lawrence Berkeley National Laboratory in collaboration with the Institute of Modern Physics, Lanzhou, China, has developed a Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn superconducting magnet system for fourth-generation electron cyclotron resonance (ECR) ion source operating at microwave frequency 45 GHz. This paper presents mechanical design capable supporting up to required operational level, resulting peak coil fields order...
Superconducting electron cyclotron resonance ion source with advance design in Lanzhou (SECRAL) is an 18–28 GHz fully superconducting (ECR) dedicated for highly charged heavy beam production. SECRAL, innovative magnet structure of solenoid-inside-sextupole and at lower frequency rf power operation, may open a new way developing compact reliable high performance ECR source. One the recent highlights achieved SECRAL that some record currents very charge states were produced by 18 or 18+14.5...
Superconducting electron cyclotron resonance (ECR) ion source with advanced design in Lanzhou (SECRAL) is a next generation ECR and aims for developing very compact superconducting structure high performances highly charged ion-beam production. The was designed to be operated at 18GHz initial operation finally will extended 28GHz. magnet confinement configuration of the consists three axial solenoid coils six sextupole cold iron as field booster clamping. At full excitation, this assembly...
There has been increasing demand to provide higher beam intensity and high enough energy for heavy ion accelerator some other applications, which driven electron cyclotron resonance (ECR) source produce charge state ions with intensity. One of development trends highly charged ECR is build new generation sources by utilization superconducting magnet technology. SECRAL (superconducting advanced design in Lanzhou) was successfully built intense beams Heavy Ion Research Facility Lanzhou...
A low energy beam transport (LEBT) system has been built for a compact pulsed hadron source (CPHS) at Tsinghua University in China. The LEBT, consisting of two solenoids and three short-drift sections, transports proton 60 mA 50 keV to the entrance radio frequency quadrupole (RFQ). Measurement shown normalized RMS emittance less than 0.2 π mm mrad end LEBT. Beam simulations were carried out compare with measurement are good agreement. Based on successful CPHS LEBT development, new China ADS...
SECRAL (superconducting ECR ion source with advanced design in Lanzhou) has been routine operation for Heavy Ion Research Facility Lanzhou (HIRFL) accelerator complex since May 2007. To further enhance the performance order to satisfy increasing demand intensive highly charged beams, 3–5 kW high power 24 GHz single frequency and +18 double an aluminum plasma chamber were tested, some exciting results produced quite a few new record beam intensities, such as 129Xe35+ of 64 eμA, 129Xe42+ 3...
Modern heavy ion accelerators require intense beams with high charge state. Electron cyclotron resonance (ECR) sources are the primary tool for generating such beams, making them indispensable devices physics research. Remarkable performance advancements were obtained during last decades. At present, state of art “third generation” ECR based on magnets built NbTi conductor. However, future nuclear facilities will significant improvement in beam intensity and quality, which can only be met by...
Intense heavy ion beams have been produced from IMP 14.5 GHz LECR3 by optimization of the source conditions and transmission efficiency. Highly charged stable beams, such as 325 eμA Ar11+, 95 Xe26+, 7 Xe30+, 140 Fe13+, 75 Ni12+, were obtained rf power 800–1000 W. Furthermore, an advanced superconducting ECR named SECRAL is being constructed. designed to operate at frequency 18–28 with axial mirror magnetic fields 4.0 T injection, 2.2 extraction, sextupole field 2.0 plasma chamber wall. The...
High field and high frequency have been leading the development of electron cyclotron resonance ion sources (ECRISs) in past decade as demonstrated by achieved great performance. The present superconducting magnet structures built with NbTi wires reached an axial 3.5-4.0 T a radial 2.0 for operating up to 28 GHz. Further increase magnetic strength will require higher current superconductor, i.e., Nb(3)Sn wires. This paper features new structure review existing structures. Using wires, could...
To demonstrate a Mixed Axial and Radial field System (MARS) as the best magnet scheme for future ECRISs, MARS-D, demonstrative ECRIS using NbTi MARS is progressing at Lawrence Berkeley National Laboratory. An optimized design can use either or Nb3Sn coils with reduced engineering complexities to construct needed high-field magnets. The could enhance MARS-D next generation by producing minimum-B maxima of 5.6 T axially 3.2 radially operating frequencies up 45 GHz. In-progress test winding has...
LECR4 (Lanzhou ECR ion source No. 4) is a room temperature electron cyclotron resonance source, designed to produce high current, charge state beams for the SSC-LINAC injector (a new sector separated cyclotron) at Institute of Modern Physics. also serves as PoP machine application evaporative cooling technology in accelerator field. To achieve those goals, has been optimized operation 18 GHz. During 2014, was commissioned GHz microwave 1.6 kW. further study influence injection stage...
Electron Cyclotron Resonance (ECR) Ion Sources at Lawrence Berkeley National Laboratory's (LBNL) 88-Inch produce heavy ion cocktails to test the radiation hardness of spacecraft electronics. A 20 MeV/u cocktail is underway and 10 has been expanded include gold.
Electron cyclotron resonance (ECR) ion sources are used for complex and atomic physics research at the Institute of Modern Physics (IMP). Intense beams highly charged gaseous metallic ions could be produced by IMP 14.5 GHz ECR source (LECR2-Lanzhou Cyclotron Resonance Ion Source No. 2). A particular emphasis has been put on production recently. Metallic Mg, Ca, Fe, Ni, Cu, Zn, Pb were tested (LECR2) to improve beam intensities long-term stability. new (Lanzhou 3), an upgraded version but...
Ion beam transport from the Superconducting Electron Cyclotron Resonance ion source with Advanced design in Lanzhou (SECRAL) electron cyclotron resonance was studied at Institute of Modern Physics during 2010. Particle-in-cell simulations and experimental results have shown that both space charge magnetic aberrations lead to a larger envelope emittance growth. In existing SECRAL extraction line, it has been raising solenoid lens field reduces subsequent dipole lower emittance. Detailed...
The long-term operation of high charge state electron cyclotron resonance ion sources fed with microwave power has caused damage to the plasma chamber wall in several laboratories. Porosity, or a small hole, can be progressively created which destroy over few year time scale. A burnout VENUS is investigated hole formation relation local hot density studied. First, results simple model assuming that electrons are fully magnetized and strictly following magnetic field lines presented....
A new room temperature electron cyclotron resonance (ECR) ion source, DRAGON, is under construction at IMP. DRAGON designed to operate microwaves of frequencies 14.5–18 GHz. Its axial solenoid coils are cooled with evaporative medium provide an magnetic mirror field 2.5 T the injection and 1.4 extraction, respectively. In comparison other conventional ECR sources, has so far largest bore plasma chamber inner diameter 126 mm maximum radial fields 1.4–1.5 produced by a non-Halbach permanent...
Superconducting electron cyclotron resonance ion source with advanced design in Lanzhou (SECRAL) is an all-superconducting-magnet (ECRIS) for the production of intense highly charged beams to meet requirements Heavy Ion Research Facility (HIRFL). To further enhance performance SECRAL, aluminum chamber has been installed inside a 1.5 mm thick Ta liner used reduction x-ray irradiation at high voltage insulator. With double-frequency (18+14.5 GHz) heating and maximum total microwave power 2.0...