Design and test of a compact beam current monitor based on a passive RF cavity for a proton therapy linear accelerator

2021 ◽  
Vol 92 (11) ◽  
pp. 113304
Author(s):  
F. Cardelli ◽  
A. Ampollini ◽  
G. Bazzano ◽  
P. Nenzi ◽  
L. Piersanti ◽  
...  
Keyword(s):  
Proton Therapy ◽  
Linear Accelerator ◽  
Beam Current ◽  
Rf Cavity

Injector for a 100-500 kV Linac Electron Microscopy Source

1967 ◽  
Vol 25 ◽  
pp. 274-275
Author(s):  
John W. Coleman
Keyword(s):  
Electron Microscopy ◽  
Linear Accelerator ◽  
Beam Current ◽  
Ion Trapping ◽  
University Of Virginia ◽  
Electron Injector ◽  
Illumination System ◽  
Radio Corporation Of America ◽  
The University ◽  
Optical Integration

The injector to be described is a component in the Electron Injector-Linear Accelerator—Condenser Module for illumination used on the variable 100-500kV electron microscope being built at the Radio Corporation of America for the University of Virginia.The injector is an independently powered, autonomous unit, operating at a constant 6kV positive with respect to accelerator potential, thereby making beam current independent of accelerator potential. The injector provides for on-axis ion trapping to prolong filament lifetime, and incorporates a derived Einzel lens for optical integration into the overall illumination system for microscopy. Electrostatic beam deflectors for alignment are an integral part of the apparatus. The entire injector unit is cantilevered off a door for side loading, and is topped with a 4-filament turret released electrically but driven by a self-contained Negator spring motor.

scholarly journals Novel Gd3+-doped silica-based optical fiber material for dosimetry in proton therapy

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
C. Hoehr ◽  
A. Morana ◽  
O. Duhamel ◽  
B. Capoen ◽  
M. Trinczek ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Proton Therapy ◽  
Bragg Peak ◽  
Light Emission ◽  
Sol Gel ◽  
Fiber Material ◽  
Beam Current ◽  
Strong Luminescence ◽  
The University

Abstract Optical fibers hold promise for accurate dosimetry in small field proton therapy due to their superior spatial resolution and the lack of significant Cerenkov contamination in proton beams. One known drawback for most scintillation detectors is signal quenching in areas of high linear energy transfer, as is the case in the Bragg peak region of a proton beam. In this study, we investigated the potential of innovative optical fiber bulk materials using the sol-gel technique for dosimetry in proton therapy. This type of glass is made of amorphous silica (SiO$${}_{2}$$ 2 ) and is doped with Gd$${}^{3+}$$ 3 + ions and possesses very interesting light emission properties with a luminescence band around 314 nm when exposed to protons. The fibers were manufactured at the University of Lille and tested at the TRIUMF Proton Therapy facility with 8.2–62.9 MeV protons and 2–6 nA of extracted beam current. Dose-rate dependence and quenching were measured and compared to other silica-based fibers also made by sol-gel techniques and doped with Ce$${}^{3+}$$ 3 + and Cu$${}^{+}$$ + . The three fibers present strong luminescence in the UV (Gd) or visible (Cu,Ce) under irradiation, with the emission intensities related directly to the proton flux. In addition, the 0.5 mm diameter Gd$${}^{3+}$$ 3 + -doped fiber shows superior resolution of the Bragg peak, indicating significantly reduced quenching in comparison to the Ce$${}^{3+}$$ 3 + and Cu$${}^{+}$$ + fibers with a Birks’ constant, k$${}_{B}$$ B , of (0.0162 $$\pm $$ ± 0.0003) cm/MeV in comparison to (0.0333 $$\pm $$ ± 0.0006) cm/MeV and (0.0352 $$\pm $$ ± 0.0003) cm/MeV, respectively. To our knowledge, this is the first report of such an interesting k$${}_{B}$$ B for a silica-based optical fiber material, showing clearly that this fiber presents lower quenching than common plastic scintillators. This result demonstrates the high potential of this inorganic fiber material for proton therapy dosimetry.

scholarly journals EP-2196: Component beam results of a versatile and compact linear accelerator for proton therapy

2018 ◽  
Vol 127 ◽  
pp. S1213
Author(s):  
G. De Michele ◽  
G. D'Auria ◽  
A. Degiovanni ◽  
J. Farr ◽  
M. Baelen ◽  
...  
Keyword(s):  
Proton Therapy ◽  
Linear Accelerator

scholarly journals Measurement of bunch length and temporal distribution using accelerating radio frequency cavity in low-emittance injector

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Ji-Gwang Hwang ◽  
Tsukasa Miyajima ◽  
Yosuke Honda ◽  
Eun-San Kim
Keyword(s):  
Radio Frequency ◽  
Linear Accelerator ◽  
Energy Recovery ◽  
Temporal Distribution ◽  
Experimental Methodology ◽  
Bunch Length ◽  
Rf Cavity ◽  
Energy Recovery Linac ◽  
Longitudinal Position ◽  
Low Emittance

Abstract We demonstrate an experimental methodology for measuring the temporal distribution of pico-second level electron bunch with low energy using radial electric and azimuthal magnetic fields of an accelerating ($$\hbox {TM}_{01}$$ TM 01 mode) radio frequency (RF) cavity that is used for accelerating electron beams in a linear accelerator. In this new technique, an accelerating RF cavity provides a phase-dependent transverse kick to the electrons, resulting in the linear coupling of the trajectory angle with the longitudinal position inside the bunch. This method does not require additional devices on the beamline since it uses an existing accelerating cavity for the projection of the temporal distribution to the transverse direction. We present the theoretical basis of the proposed method and validate it experimentally in the compact-energy recovery linac accelerator at KEK. Measurements were demonstrated using a 2-cell superconducting booster cavity with a peak on-axis accelerating field ($$E_0$$ E 0 ) of 7.21 MV/m.

Lattice Design of Dedicated Synchrotron for Proton Therapy

2008 ◽  
Author(s):  
M. Hosseinzadeh ◽  
M. Ghergherechi ◽  
S. A. H. Feghhi ◽  
A. Mohammadzadeh ◽  
H. Afarideh
Keyword(s):  
Proton Beam ◽  
Proton Therapy ◽  
Accelerator Facility ◽  
Rf Cavity ◽  
Lattice Design ◽  
Longitudinal Plane ◽  
Lattice Arrangement ◽  
Emittance Growth ◽  
Proton Beam Energy ◽  
C 30

A compact model of synchrotron accelerator facility is proposed for the treatment of deep seated tumors with proton therapy. The extracted beam from the existing C-30 cyclotron is first injected into the model of synchrotron. The injected beam is specified with its longitudinal plane as well as its horizontal and vertical emittances. For this design to be compatible with the cyclotron C-30 the synchrotron should be kept compact and the number of magnet components must be low. The modeled synchrotron layout is designed using the computer codes MADX and AGILE in order to accelerate the injection proton ions from 30 MeV to a maximum extraction energy of 250 MeV with magnetic rigidity of 2.433 Tm. In this lattice arrangement with phase advance of about 90 degrees in two horizontal and vertical planes doublet cells are utilized. This ring consists of two long straight sections for RF and injection/extraction equipment, as well as four short straight sections. For chromaticity correction two families of sextupoles are used. To prohibit emittance growth, a matching at injection in longitudinal plane was performed. The proton beam energy spread of 2% can be improved to 0.1% at injection by using the designed achromatic system. For the proton beam acceleration a RF cavity with an approximate voltage of 160 volts with a frequency in the range of 2.3 up to 14 MHz is used.

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