摘要:

We present the successful prototype development results of a novel compact rotating‐wave electron beam accelerator (RWA). The RWA uses a single cylindrical cavity holding a transverse‐magnetic resonant mode in combination with an axial static magnetic field to accelerate electrons to higher energies. With approximately 80 kilowatts of microwave power fed into a C‐band cavity, we have been able to successfully accelerate a 3 keV electron beam to ∼760 keV. The compact RWA accelerator could be the basis for a new class of compact and affordable 1–10 MeV microwave accelerators for military, medical and industrial applications. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1619871

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

Radiation Dynamics, Inc. (RDI), currently a wholly‐owned subsidiary of Ion Beam Applications (IBA), has supplied particle accelerators for both research and industrial applications worldwide for almost 50 years. The industrial market demands are driving the development of a new Dynamitron® system with a smaller, more compact configuration that may be provided at a lower entry cost. This new system, operating at electron energies up to 1.0 MeV, includes integral shielding, which allows the appropriate material handling system to be installed inside the radiation enclosure. Designed to operate with beam power levels as high as 100 kW, this new system provides a robust base for high‐throughput crosslinking of products such as electrical wire, heat‐shrinkable plastic tubing and sheet materials. Still retaining the positive aspects of the current Dynamitron system that have established it firmly in the industrial sector, this compact system can be tailored to meet a variety of processing applications. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1619872

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

At the Wakasa Wan Energy Research Center (WERC), we had constructed an accelerator system with a 5 MV tandem accelerator and a 200 MeV proton synchrotron. The tandem machine has 5 beam lines for the MeV order beam experiments. Also the tandem beam is injected to the synchrotron. The beam accelerated by the synchrotron is used at three experimental beam lines. After the completion of the construction in 2000, we have been performing experiments using the system for the ion beam analyses (RBS, ERDA, PIXE) and irradiations for the material and biological sciences. In 2002, the study of the cancer therapy with a proton beam from the synchrotron was started. In this paper, the layout of the accelerator facility, recent development for the accelerators and experiments will be reported. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1619873

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

A booster linac based on the Radio Frequency Quadrupole (RFQ linac) has been put into routine operation on the 6.5 MV EN tandem accelerator at the Sandia National Laboratories (SNL) Ion Beam Materials Research Lab (IBMRL) for Radiation Effects Microscopy (REM) experiments with high energy, heavy ion beams. The booster linac consists of two RFQ stages that accelerate heavy ions with m/q < 8 from 0.25 MeV/amu up to 1.22 MeV/amu in the first stage and to 1.90 MeV/amu in the second stage to produce high Linear Energy Transfer (LET) ions for REM. This RFQ linac has a total length of 6.0 meters and is installed on a new experimental beam line at the SNL IBMRL to measure single‐event upset (SEU) cross‐sections of integrated circuits (ICs) and to perform radiation hardness research using REM with the associated Ion Electron Emission Microscope (IEEM). This paper presents the recent beam measurement results from operation of the RFQ linac with beams from silicon to gold and compares these results with theoretical beam dynamics calculations. It also describes the details of the experiments to measure SEU cross‐sections and IEEM. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1619874

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

The coupled multiplier is a new approach to efficient generation of MeV d.c. power for accelerator applications. High voltage is produced by a series of modules, each of which consists of a high‐power alternator, step‐up transformer, and 3‐phase multiplier circuit. The alternators are connected mechanically along a rotating shaft, and connected by insulating flexible couplers. This approach differs from all previous d.c. technologies in that power is delivered to the various stages of the system mechanically, rather than through capacitive or inductive electrical coupling. For this reason the capital cost depends linearly on required voltage and power, rather than quadratically as with conventional technologies. The CM technology enables multiple electron beams to be driven within a common supply and insulating housing. MeV electron beam is extremely effective in decomposing organic contaminants in water. A 1 MeV, 100 kW industrial accelerator using the CM technology has been built and is being installed for treatment of wastewater at a petrochemical plant. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1619875

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

The Ebco Technologies TR cyclotrons have a common parent in the 500 MeV negative ion cyclotron at TRIUMF in Vancouver. As such, the TR cyclotrons have features that can be adapted for specific application. The cyclotron design is modularized into ion source and injection system, central region and then extraction. The cyclotron ion source is configured for cyclotron beam currents ranging from 50 microAmps to 2 milliAmps. The injection line can be operated in either continuous (CW) or in pulsed mode. The center region of the cyclotron is configured to match the ion source configuration. The extracted beams are directed either to a local target station or to beam lines and thence to target stations. There has been development both in solid, liquid and gas targets. There has been development in radioisotope handling techniques, target material recovery and radiochemical synthesis. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1619876

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

The first HVE Tandetron™ with a nominal terminal voltage of 5 MV has been put into operation at the Universidad Auto´noma de Madrid (Spain) as part of their new IBA facility. The accelerator features a coaxial structure in which the all‐solid‐state power supply is constructed around the high‐energy acceleration tube, thereby avoiding the T‐shaped tank that has characterized the HVE Tandetrons™ so far. The new IBA facility covers a number of different ion beam analysis techniques including ERD using heavy‐element time‐of‐flight, RBS, as well as an external micro‐beam for PIXE. During installation, tests have shown a stable terminal voltage of 5.5 MV. The terminal voltage ripple was deduced to be below 6 × 10−6(RMS) for terminal voltages above 800 kV. Terminal voltage undershoot was measured to be 1.4 × 10−3for a ∼1 kW beam at 3 MV and recovered to 1 × 10−4within 800 ms. IBA experiments that require low energy hydrogen beams are supported by a stable terminal voltage down to 100 kV. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1619877

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

A post‐accelerator for rare isotopes (RIB linac) which must produce high‐quality beams of radioactive ions over the full mass range, including uranium, at energies above the coulomb barrier is being developed for the U.S. RIA facility. To provide highest possible intensity of rare isotopes with masses from 6 to 240, the linac will accept all ions in the 1+ charge state. A high resolution separator for purifying beams at the isobaric level precedes the RIB linac. Charge stripping in the linac takes place at two stages: helium gas stripping at energies of a few tens of keV/u, and an additional foil stripping at ∼680–1700 keV/u for the heavier ions. The RIB linac will utilize existing superconducting heavy‐ion linac technology for all but one exceptional piece, a very‐low‐charge‐state injector, which is needed for the first ∼9 MV of the accelerator. This section consists of a pre‐buncher followed by three sections of cw, normally‐conducting RFQ. The first section is a conventional RFQ operating at 12 MHz. The following two sections are hybrid RFQs operating at 12 and 24 MHz. A 1:2 scale cold model of 12 MHz RFQ was built and it is being studied in order to determine final specifications for the full power 12 MHz hybrid RFQ. This paper reports on the present status of the RIB linac development with particular attention paid to the very‐low‐charge‐state injector section. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1619878

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

RFQs are the standard solution for new ion injectors for light and heavy ions. A survey on work on high duty factor high current RFQs will be given to illustrate the various solutions and the special problems in that field, which covers e.g. RFQs as spallation source injectors, neutron generators as well as idustrial applications. High power RFQs play a key role in this development, because in that the low energy section the beam from the ion source is formed and a bunched low emittance beam is generated. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1619879

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

AnRfFocusedInterdigital (RFI) ion accelerating structure will be described. It represents an effective combination of the Widero¨e (or interdigital) linac structure, used for many low frequency, heavy ion applications, and the rf electric quadrupole focusing used in the RFQ and RFD linac structures. As in the RFD linac structure, rf focusing is introduced into the RFI linac structure by configuring the drift tubes as two independent pieces operating at different electrical potentials as determined by the rf fields of the linac structure. Each piece (or electrode) of the RFI drift tube supports two fingers pointed inwards towards the opposite end of the drift tube forming a four‐finger geometry that produces an rf quadrupole field along the axis of the linac for focusing the beam. However, because of the differences in the rf field configuration along the axis, the scheme for introducing rf focusing into the interdigital linac structure is quite different from that adopted for the RFD linac structure. The RFI linac structure promises to have significant size, efficiency, performance, and cost advantages over existing linac structures for the acceleration of low energy ion beams of all masses (light to heavy). These advantages will be reviewed. A “cold model” of this new linac structure has been fabricated and the results of rf cavity measurements on this cold model will be presented. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1619880

出版商:AIP    

年代:1903

数据来源: AIP