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.

Ion optical design of the BRF-FNAL-SAIC-UW PET accelerator

Project status of the 3He ++ 10.5 MeV RFQ Linear Accelerator for the production of PET isotopes will be presented. The accelerator design was begun in September of 1995 with a goal of completion and delivery of the accelerator to BRF in Shreveport, Louisiana by the summer of 1997. The design effort and construction is concentrated in Lab G on the Fermilab campus. Some of the high lights include a 25 mA peak current 3He + ion source, four RFQ accelerating stages that are powered by surplus Fermilab linac RF stations, a gas jet charge doubler, and a novel 540 degree bending Medium Energy Beam Transport (MEBT). The machine is designed to operate at 360 Hz repetition rate with a 2.5% duty cycle. The average beam current is expected to be 150-300 micro amperes electrical, 75-150 micro amperes particle current. HISTORY

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A 3he ++ rfq accelerator for the production of pet isotopes

Two major upgrades to the Fermilab accelerator complex required the measurement of magnetic field strength and shape for a large number of electromagnets and permanent magnets. This paper describes the software system developed at Fermilab to measure these magnets. The data produced by this system was used to feed back information to the magnet design and fabrication process, as well as to help in determining magnet placement within the accelerator. The central framework of the measurement software is a relational database management system (RDBMS). Tables within the RDBMS are designed to store magnet design and identification information, measurement prescriptions, magnetic field strength and shape data, comment text entered by measurement technicians, lists of instrumentation used during measurements, calibration constants used to convert data to appropriate engineering units, and quality control limits for measurement data. The system employs a client-server architecture in which measurement computers, distributed at each of the magnet test stands, retrieved measurement prescriptions from the RDBMS server, controlled the data acquisition hardware used to run the measurement, and communicated measurement data back to the RDBMS. Additional client software was developed to apply analysis algorithms to the measurement data. These clients run either at the test stand, or frommore » analysts' workstations. Standard tools provided by the RDBMS vendor facilitated report generation, ad-hoc queries, and manual data entry.« less

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A software system for measurement of accelerator magnets using a relational database

Project status of the /sup 3/He/sup ++/ 10.5 MeV RFQ linear accelerator for the production of PET isotopes will be presented. The accelerator design was begun in September of 1995 with a goal of completion and delivery of the accelerator to BRF in Shreveport, Louisiana by the summer of 1997. The design effort and construction is concentrated in Lab G on the Fermilab campus. Some of the high lights include a 25 mA peak current /sup 3/He/sup +/ ion source, four RFQ accelerating stages that are powered by surplus Fermilab linac RF stations, a gas jet charge doubler, and a novel 540 degree bending Medium Energy Beam Transport (MEET). The machine is designed to operate at 360 Hz repetition rate with a 2.5% duty cycle. The average beam current is expected to be 150-300 micro amperes electrical, 75-150 micro amperes particle current.

/pdf/a-3he-sup-rfq-accelerator-for-the-production-of-pet-isotopes-ouop9uw5ig.pdf

A 3He/sup ++/ RFQ accelerator for the production of PET isotopes

The Fermilab Main Injector project is building 344 dipoles, produced from steel with varying magnetic properties. The strategies for assigning dipoles, based upon their strength characteristics, are discussed. The closed orbit errors due to the strength variations are expected to be small in comparison to alignment errors.

Excitation characteristics of Fermilab Main Injector dipoles and magnet assignment to reduce closed orbit errors

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.

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Magnet development for the BRF positron emission tomography accelerator

New horizontal and vertical trim dipoles have been designed for the Fermilab Main Injector (FMI) and are being assembled in the Fermilab Technical Division Magnets are 426 cm in length (305 cm steel length) and have similar cross-section dimensions The horizontal (vertical) magnet gap is 508 mm (127 mm) and the target integrated strength is 0072 T*m (0029 T*m) The major design effort lay in making air cooling possible for these magnets This report presents the magnets' thermal and magnetic properties and discusses the limitation on excitation current

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I. Terechkine

Papers

Magnet development for the BRF positron emission tomography accelerator

Air-cooled trim dipoles for the Fermilab Main Injector