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D. Sun

Bio: D. Sun is an academic researcher. The author has contributed to research in topics: Linear particle accelerator & Particle accelerator. The author has an hindex of 2, co-authored 3 publications receiving 11 citations.

Papers
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Proceedings ArticleDOI
12 May 1997
TL;DR: In this article, an end-to-end ion optics design of an RFQ-based /sup 3/He PET accelerator is discussed, where the medium energy beam transport (MEBT) portion is modified to allow a match between high power RFQ's and linacs, a problem faced by several possible future accelerators.
Abstract: Production of positron emitting radioactive isotopes /sup 18/F, /sup 15/O, /sup 11/C and /sup 13/N for use in positron emission tomography is important for medical imaging. The present state of the production art is to use cyclotrons to accelerate deuterons to an energy range in the 10's of MeV and impinge the deuterons on appropriate targets. An alternative approach is to use a cascade of RFQ's to accelerate /sup 3/He ions to 10-MeV as the bombarding particles. Due to the lower background radiation, a /sup 3/He accelerator requires far less shielding than a cyclotron, in addition to other advantages. This paper will discuss briefly the end to end ion optics design of an RFQ based /sup 3/He PET accelerator. Emphasis will be on the medium energy beam transport (MEBT) portion. The MEBT required a solution to the difficult problem of matching two RFQ's while allowing room for a gas jet stripper. Our solution to this problem could be modified to allow a match between high power RFQ's and linacs, a problem faced by several possible future accelerators.

7 citations

Proceedings ArticleDOI
02 Jul 2001
TL;DR: In this paper, an improved H/sup ion source with an electrostatic transport to a two-section radio-frequency quadrupole (RFQ) accelerator, with the RFQ sections separated by a magnetic five-dimensional phase-space imaging system as used in an earlier Fermilab/SAIC PET Project, and a new 10-MeV drift-tube linac cavity have been studied.
Abstract: Improvements in the Fermilab operating 400-MeV linear accelerator injector are required to achieve the beam intensity and emittance requirement of the Proton Driver design study. It has been determined that these requirements can be achieved by replacing the components in the linac below 10 MeV. An improved H/sup -/ ion source with an electrostatic transport to a two-section radio-frequency quadrupole (RFQ) accelerator, with the RFQ sections separated by a magnetic five-dimensional phase-space imaging system as used in an earlier Fermilab/SAIC PET Project, and a new 10-MeV drift-tube linac cavity have been studied. It appears possible that an H/sup -/ intensity of 4.5/spl times/10/sup 13/ ions per pulse with an improvement in beam emittance from the present system can be achieved with the proposed changes.

3 citations

DOI
01 Jan 1996
TL;DR: This paper updates the progress of the PET 3He RFQ accelerator, the current status of the design, and some of the interesting ongoing research.
Abstract: In 1995, Fermilab and SAIC formed a collaboration with partners from the University of Washington (UW) and the Biomedical Research Foundation of Northwest Louisiana (BRF) to explore an innovative approach to the production of radioisotopes. The accelerator system that is being developed accelerates 3He to 10.5 MeV and then delivers this beam to the target to produce the short lived radioisotopes of interest to the PET community (18F, 15O, 13N, 11C). Research is being conducted to investigate the contribution that this promising approach can make to clinical and research PET. The accelerator system has several very interesting aspects. These innovations include multiple RFQ accelerators configured in series, a gas stripper jet to doubly charge the low energy (1 MeV) 3He beam, and an isochronous matching section to manipulate the transverse and maintain the longitudinal profile of the beam (without the use of an RF buncher) in the charge doubler transition section between RFQ’s. This paper updates the progress of the PET 3He RFQ accelerator, the current status of the design, and some of the interesting ongoing research.

1 citations


Cited by
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ReportDOI
TL;DR: The High Current Experiment (HCX) at Lawrence Berkeley National Laboratory is part of the US program that explores heavy-ion beam as the driver option for fusion energy production in an inertial fusion energy (IFE) plant.
Abstract: The High Current Experiment (HCX) at Lawrence Berkeley National Laboratory is part of the US program that explores heavy-ion beam as the driver option for fusion energy production in an Inertial Fusion Energy (IFE) plant. The HCX is a beam transport experiment at a scale representative of the low-energy end of an induction linear accelerator driver. The primary mission of this experiment is to investigate aperture fill factors acceptable for the transport of space-charge-dominated heavy-ion beams at high intensity (line charge density {approx}0.2 {micro}C/m) over long pulse durations (4 {micro}s) in alternating gradient focusing lattices of electrostatic or magnetic quadrupoles. This experiment is testing transport issues resulting from nonlinear space-charge effects and collective modes, beam centroid alignment and steering, envelope matching, image charges and focusing field nonlinearities, halo and, electron and gas cloud effects. We present the results for a coasting 1 MeV K{sup +} ion beam transported through ten electrostatic quadrupoles. The measurements cover two different fill factor studies (60% and 80% of the clear aperture radius) for which the transverse phase-space of the beam was characterized in detail, along with beam energy measurements and the first halo measurements. Electrostatic quadrupole transport at high beam fill factor ({approx}80%) ismore » achieved with acceptable emittance growth and beam loss. We achieved good envelope control, and re-matching may only be needed every ten lattice periods (at 80% fill factor) in a longer lattice of similar design. We also show that understanding and controlling the time dependence of the envelope parameters is critical to achieving high fill factors, notably because of the injector and matching section dynamics.« less

9 citations

Proceedings ArticleDOI
12 May 1997
TL;DR: The Medium Energy Beam Transport (MEBT) as discussed by the authors accelerator takes a small beam from a first RFQ acceleration device and matches it into a small 3D-acceptance at a second RFQ section.
Abstract: A collaboration involving the Biomedical Research Foundation, Science Applications International Corporation, Fermi National Accelerator Laboratory, and the University of Washington is developing an accelerator for producing isotopes for Positron Emission Tomography (PET) scans. The Medium Energy Beam Transport (MEBT) section of this accelerator takes a small beam from a first RFQ acceleration device and matches it into a small 3D-acceptance at a second RFQ section. The beam transport system was designed to prevent beam losses due to emittance growth. The system includes two bending dipoles and seven quadrupoles of three different types. This report contains a brief description of the MEBT magnets and their electric, magnetic and thermal properties. The magnet measurements show that each of the magnets meets the system requirements.

4 citations

Proceedings ArticleDOI
10 Jun 1999
TL;DR: An RFQ linac has been built that accelerates 3He to 105 MeV for production of C, N, O, F isotopes for PET The accelerator produces 70 μs pulses, at 360 Hz, a 25% duty cycle, with a peak current of ∼6 mAe The RFQ delivers ∼100 μAe as discussed by the authors.
Abstract: An RFQ linac has been built that accelerates 3He to 105 MeV for production of C, N, O, F isotopes for PET The accelerator produces 70 μs pulses, at 360 Hz, a 25% duty cycle, with a peak current of ∼6 mAe The RFQ delivers ∼100 μAe A recirculating water target has been evaluated for production of 18F and low specific activity 15O Recoil chemistry within the target has been evaluated to improve 15O specific activity Gas targets have also been tested for production of 15O 13N is made from carbon Several target materials have been evaluated for producing 11C, including C, B and Be The challenges of targetry for this high current, low energy machine led us to evaluate large, high aspect ratio windows and grid supports The 3He RFQ is a useful research machine for testing targets for pulsed, high power density, low LET beams

4 citations

Proceedings ArticleDOI
12 May 1997
TL;DR: The /sup 3/He/He linac for production of positron-emitting radioactive isotopes accelerates singly ionized 3/he/sup +/ ions to an energy of 1 MeV in a 212.5-MHz RFQ as mentioned in this paper.
Abstract: The /sup 3/He RFQ linac for production of positron-emitting radioactive isotopes accelerates singly-ionized /sup 3/He/sup +/ ions to an energy of 1 MeV in a 212.5-MHz RFQ. The ions are then stripped to form doubly-ionized /sup 3/He/sup ++/ in a gas-jet stripping cell, and transported by the MEBT to the 425-MHz RFQ string for acceleration to 10.5 MeV. The stripper cell utilizes a mechanical injector to provide gas pulses to a nozzle. The directed gas jet passes across the beam into a scavenge section which pumps away the gas. The MEBT is an achromatic, isochronous transport section based on two 270-degree bend magnets. It provides bunched and focused beam to the 425-MHz RFQ string.

4 citations

Proceedings ArticleDOI
02 Jul 2001
TL;DR: In this paper, an improved H/sup ion source with an electrostatic transport to a two-section radio-frequency quadrupole (RFQ) accelerator, with the RFQ sections separated by a magnetic five-dimensional phase-space imaging system as used in an earlier Fermilab/SAIC PET Project, and a new 10-MeV drift-tube linac cavity have been studied.
Abstract: Improvements in the Fermilab operating 400-MeV linear accelerator injector are required to achieve the beam intensity and emittance requirement of the Proton Driver design study. It has been determined that these requirements can be achieved by replacing the components in the linac below 10 MeV. An improved H/sup -/ ion source with an electrostatic transport to a two-section radio-frequency quadrupole (RFQ) accelerator, with the RFQ sections separated by a magnetic five-dimensional phase-space imaging system as used in an earlier Fermilab/SAIC PET Project, and a new 10-MeV drift-tube linac cavity have been studied. It appears possible that an H/sup -/ intensity of 4.5/spl times/10/sup 13/ ions per pulse with an improvement in beam emittance from the present system can be achieved with the proposed changes.

3 citations