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Title: Non-scaling fixed field alternating gradient permanent magnet cancer therapy accelerator

Abstract

A non-scaling fixed field alternating gradient accelerator includes a racetrack shape including a first straight section connected to a first arc section, the first arc section connected to a second straight section, the second straight section connected to a second arc section, and the second arc section connected to the first straight section; an matching cells configured to match particle orbits between the first straight section, the first arc section, the second straight section, and the second arc section. The accelerator includes the matching cells and an associated matching procedure enabling the particle orbits at varying energies between an arc section and a straight section in the racetrack shape.

Inventors:
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1358218
Patent Number(s):
9,661,737
Application Number:
14/285,706
Assignee:
The United States of America, as represented by the Department of Energy BNL
DOE Contract Number:
AC02-98CH10886
Resource Type:
Patent
Resource Relation:
Patent File Date: 2014 May 23
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES

Citation Formats

Trbojevic, Dejan. Non-scaling fixed field alternating gradient permanent magnet cancer therapy accelerator. United States: N. p., 2017. Web.
Trbojevic, Dejan. Non-scaling fixed field alternating gradient permanent magnet cancer therapy accelerator. United States.
Trbojevic, Dejan. 2017. "Non-scaling fixed field alternating gradient permanent magnet cancer therapy accelerator". United States. doi:. https://www.osti.gov/servlets/purl/1358218.
@article{osti_1358218,
title = {Non-scaling fixed field alternating gradient permanent magnet cancer therapy accelerator},
author = {Trbojevic, Dejan},
abstractNote = {A non-scaling fixed field alternating gradient accelerator includes a racetrack shape including a first straight section connected to a first arc section, the first arc section connected to a second straight section, the second straight section connected to a second arc section, and the second arc section connected to the first straight section; an matching cells configured to match particle orbits between the first straight section, the first arc section, the second straight section, and the second arc section. The accelerator includes the matching cells and an associated matching procedure enabling the particle orbits at varying energies between an arc section and a straight section in the racetrack shape.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 5
}

Patent:

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  • A FFAG is a particle accelerator having turning magnets with a linear field gradient for confinement and a large edge angle to compensate for acceleration. FODO cells contain focus magnets and defocus magnets that are specified by a number of parameters. A set of seven equations, called the FFAG equations relate the parameters to one another. A set of constraints, call the FFAG constraints, constrain the FFAG equations. Selecting a few parameters, such as injection momentum, extraction momentum, and drift distance reduces the number of unknown parameters to seven. Seven equations with seven unknowns can be solved to yield themore » values for all the parameters and to thereby fully specify a FFAG.« less
  • A non-scaling radial-sector FFAG is investigated as a machine to produce 2 x 10{sup 9} particles of C{sup 6+} per pulse, at an energy of 400 MeV. This is accomplished by having an ECR ion source (producing C{sup 4+} at 40 keV per nucleon), followed by an RFQ (that accelerates to a few MeV/u) and then a rapidly cycling synchrotron or linac that takes the carbon ions from 1 MeV/u to 31 MeV/u. The carbon is then fully stripped and accelerated in one FFAG to 119 MeV/u and then in a second FFAG to 414 MeV/u. The top FFAG hasmore » a radius of only 8.1 m and an aperture of 20 cm. The magnets are superconducting and have a maximum pole tip field of 5.3 T. The fields are linear, so the dynamic aperture is large. On the other hand, because the FFAG is non-scaling the tunes vary during acceleration and the rate of acceleration must be rapid enough to pass through resonances without unacceptable degradation of the beam.« less
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  • The FFAG accelerator requires static fields that increase with radius along the accelerator midplane according to B = B{sub 0} (R/R{sub 0}){sup 13.4}. The field is generated by equally spaced magnets around the circumference and varies from a maximum of 4.1 T to a minimum of {minus}1.9 T. The general coil design employs cryostable magnets wound with aluminum stabilized superconductor. Each magnet has resistive pole face windings outside of the cryostat to allow for field fine tuning after construction. A set of iron-free coil windings generate the required field distribution.
  • The International Design Study of the Neutrino Factory (IDS-NF) has recently completed its Interim Design Report (IDR), which presents our current baseline design of the neutrino factory. To increase the efficiency and reduce the cost of acceleration, the IDR design uses a linear non-scaling fixed field alternating gradient accelerator (FFAG) for its final acceleration stage. We present the current lattice design of that FFAG, including the main ring plus its injection and extraction systems. We describe parameters for the main ring magnets, kickers, and septa, as well as the power supplies for the kickers. We present a first pass atmore » an engineering layout for the ring and its subsystems.« less