Cyclotrons2016 - List of Keywords (radiation)

Paper	Title	Other Keywords	Page
MOC01	Radiation Damage of Components in the Environment of High-Power Proton Accelerators	lattice, target, proton, simulation	24
	D.C. Kiselev, R.M. Bergmann, R. Sobbia, V. Talanov, M. Wohlmuther PSI, Villigen PSI, Switzerland
	At high power accelerators, radiation damage becomes an issue particularly for components which are hit directly by the beam, like targets and collimators. Protons and secondary particles change the microscopic (lattice) structure of the materials, which macroscopically affects physical and mechanical properties. Examples are the decrease of thermal conductivity and ductility as well as dimensional changes. However, the prediction of these damage effects and their evolution in this harsh environment is highly complex as they strongly depend on parameters such as the irradiation temperature of the material, and the energy and type of particle inducing the damage. The so-called term "displacements per atom" (DPA) is an attempt to quantify the amount of radiation induced damage and to compare the micro- and macroscopic effects of radiation damage caused by different particles at different energies. In this talk, the basics for understanding of the mechanisms of radiation damage will be explained. The definition and determination of DPA and its limitations will be discussed. Measurements and examples of the impact of radiation damage on accelerator components will be presented.
	Slides MOC01 [8.493 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP05	An Air Ionization Chamber Simulation using Monte Carlo Method	simulation, detector, cathode, photon	57
	S.G. Hou, Shizhong. An, Z.W. Liu, G.F. Song, F. Wang, L.P. Wen, T.J. Zhang CIAE, Beijing, People's Republic of China
	The CYCIAE-100 cyclotron has been built at CIAE, designed to achieve 200 μA protons at 100 MeV and deliver them to several experimental targets. To achieve this goal and protect the machine from excessive radiation activation, an uncontrolled loss criteria of 1uA has been specified. Previous calculation for radiation shielding showed that high neutron and gamma were produced under this condition. To measure the high energy gamma ray(about 2 MeV ) at machine running and void damage by the prompt radiation, an air ionization chamber was designed to fulfill this goal. A Geant4 program was developed to simulate the energy response of detectors, the EM filed data was also taken into consideration in the programl. The simulation results indicate that the energy response linearity satisfies the requirement of the project specification.
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP12	Fast Scanning Beamline Design Applied to Proton Therapy System Based on Superconducting Cyclotrons	proton, cyclotron, dipole, emittance	79
	B. Qin, Q.S. Chen, K. Fan, M. Fan, K.F. Liu, P. Tan HUST, Wuhan, People's Republic of China W. Chen, Z.K. Liang, X. Liu, T. Yu Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China
	Funding: Work supported by The National Key Research and Development Pro-gram of China, with grant No. 2016YFC0105305 Proton therapy is recognized as one of the most effec-tive radiation therapy method for cancers. The super-conducting cyclotron becomes an optimum choice for delivering high quality CW proton beam with features including compactness, low power consuming and higher extraction efficiency. This paper introduces de-sign considerations of the beamline with fast scanning features for proton therapy system based on supercon-ducting cyclotrons. The beam optics, the energy selec-tion system (ESS) and the gantry beamline will be de-scribed.
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP18	Activities for Isotope Sample Production and Radiation Effect Tests at JULIC/COSY Jülich	proton, cyclotron, target, experiment	98
	O. Felden, M. Bai, R. Gebel, R. Hecker FZJ, Jülich, Germany
	At the Forschungszentrum Jülich (FZJ) the intermediate energy cyclotron JULIC, used as injector of the Cooler Synchrotron (COSY) and COSY itself, have been enabled to perform low to medium current irradiations. Main task is to support the FZJ radionuclide research programme of INM-5. Target holders of the INM-5 were implemented to the external target station of JULIC to obtain reliable irradiations with 45 MeV protons and 76 MeV deuterons for nuclear reaction cross section measurements and medical radionuclide production. For testing of radiation effects, displacement damage DD and single event effects SEE, with energetic protons for electronics used in space and accelerators the beam can be extracted to a dedicated test stand, e.g. used by Fraunhofer INT. To provide these possibilities up to 2.5 GeV as well one external beamline of the cooler synchrotron COSY will be equipped with a new irradiation station and adaption for the dosimetry systems are done. Different dosimetry systems (PTW Farmer® chambers, Bragg Peak chambers, Gafchromic® dosimetry films) are available to monitor and control the ongoing irradiation. This report briefly summarizes the relevant technical activities.
	Poster MOP18 [4.196 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP21	Test Production of Ti-44 using RFT-30 Cyclotron	target, proton, cyclotron, positron	108
	E.J. Lee, M.G. Hur, Y.B. Kong KAERI, Daejon, Republic of Korea
	RFT-30 30 MeV cyclotron has been developed for the production of radioisotopes and their applications. Fluorine-18, which is a widely-used positron emitter, has been produced regularly since 2015. In addition, research on the production of generator radioisotopes has been performed using this cyclotron. A generator means a device used to extract the positron-emitting daughter radioisotope from a source of the decaying parent radioisotope such as Ti-44 and Ge-68. In this research, gold-coated and natural Sc targets were proton-irradiated in order to produce Ti-44. Gamma spectra of irradiated targets were measured to confirm the production of Ti-44.
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP22	Simulation of Optimum Thickness and Configuration of 10 MeV Cyclotron Shield	neutron, cyclotron, shielding, simulation	110
	S. Azizpourian, H. Afarideh, M. Afkhami Karaei, M. Mousavinia AUT, Tehran, Iran F. Abbasi Davani Shahid Beheshti University, Tehran, Iran
	Baby Cyclotrons that made in Self-shield type have been employed for use in Medical center for the diagnosis of cancer diseases by positron emission tomography (PET) system. Here in we have done a discussion on gamma and neutron dose rates at a distance of one meter outside of the cyclotron shielding. This shield consist of Lead, polyethylene borated (10% Boron) layers from inside to outside respectively. With increasing the thickness of lead and polyethylene we will see a decrease in the gamma and neutron dose which received by the water phantom at a distance of one meter outside from the surface of the shield of the cyclotron. Note that the gamma and neutron dose at the beginning (without any shielding) was on the order of several thousand μSv per hour that by achieve to a certain amount of thickness of the shield, the dose was reduced to below of the limited level. In this study, the MCNPX Code has been used. In MCNPX Code that used the variance reduction techniques for decreasing relative errors of calculation which was a good method for this case study.
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOE02	A Multi-leaf Faraday Cup Especially for Proton Therapy of Ocular Tumors	proton, ion, cyclotron, target	118
	S. Seidel, J. Bundesmann, T. Damerow, A. Denker, C.S.G. Kunert HZB, Berlin, Germany A. Weber Charite, Berlin, Germany
	In cooperation with the university hospital Charité – Universitätsmedizin Berlin the Helmholtz-Zentrum Berlin (HZB) provides a proton beam used for radiation therapy of intraocular tumors. The protons are accelerated to 68 MeV by an isochronous cyclotron as the main accelerator. The human eye is a very small and complex organ with several critical structures which must be spared from irradiation as much as possible. Hence radiation therapy with protons is especially convenient due to their well-defined Bragg peak. At the HZB the distal fall off (the distance between 90% and 10% of the dose level) is less than 1 mm in water. Therefore it is crucial to measure the energy and maximum range of the beam with the corresponding high accuracy. A Multi-Leaf Faraday Cup (MLFC) allows a quick and precise range-measurement of proton beams. We present a MLFC which meets those special requirements of the eye tumor therapy. Results of range-measurements in different energy regions revealing the achievable submillimeter precession are shown; and examples for applications in radiation hardness testing are given.
	Slides MOE02 [2.082 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUB03	A Novel Use oF FFAGs in ERLs - in Colliders: eRHIC, LHeC and a Prototype at Cornell University	electron, linac, collider, ion	140
	D. Trbojevic, I. Ben-Zvi, J.S. Berg, M. Blaskiewicz, S.J. Brooks, K.A. Brown, W. Fischer, Y. Hao, V. Litvinenko, G.J. Mahler, W. Meng, F. Méot, M.G. Minty, S. Peggs, V. Ptitsyn, T. Roser, P. Thieberger, N. Tsoupas, J.E. Tuozzolo, H. Witte BNL, Upton, Long Island, New York, USA J. Barley, A.C. Bartnik, I.V. Bazarov, J.A. Crittenden, J. Dobbins, B.M. Dunham, R.G. Eichhorn, F. Furuta, R.E. Gallagher, G.H. Hoffstaetter, Y. Li, W. Lou, C.E. Mayes, J.R. Patterson, D.M. Sabol, D. Sagan, K.W. Smolenski, R.M. Talman Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA S.A. Bogacz, D. Douglas, T. Satogata JLab, Newport News, Virginia, USA
	Funding: New York State We propose a novel use of Fixed Field Altrenating Gradient beam line (FFAG) to replace multiple beam lines in existing ERL's (4-pass at Novosibirsk, ERL of CEBAF, ERL at KEK, etc.) with a single FFAG beam line connected with spreaders and combiners to the linac. We present two designs for the Electron Ion Colliders one at CERN LHeC and one at Brookhaven National Laboratory to be placed in the tunnel of the existing Relativistic Heavy Ion Collider (RHIC) called eRHIC. The proof of principle electron accelerator with the FFAG arc is to be built at Cornell University Wilson Hall where there are already available injector, superconducting linac accelerator and the dump. There are very new developments in the FFAG design never accomplished before: arc-to straight adiabatic matching with merged multiple orbits into one, permanent magnet design for the arc and straights with ability of four times in energy, etc.
	Slides TUB03 [23.650 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THP10	Status and Upgrade of the Cryogenic Plant of the LNS Superconducting Cyclotron After 25 Years of Operation	cryogenics, cyclotron, extraction, vacuum	325
	F. Noto, M. Cafici, A. Carbonaro, A. Di Stefano, A. Pagano, F. Speziale INFN/LNS, Catania, Italy
	The Superconducting Cyclotron (CS) is a compact ac-celerator with three sectors with a wide operating dia-gram, capable of accelerating heavy ions with values q/A from 0.1 to 0.5 up to energies from 10 to 80 MeV/u. An upgrade of the CS superconducting magnet is in progress to extend the capability of the machine to high intensity beam facilities. In this paper we describe the status of CS Cryostat and its Cryogenic Plant after 25 years of continuous opera-tions at 4.2 K with the exception of the stop of about one year for the tenth test and the stop for restoring of the liquefier and the main issues happened during that long time. We describe the last complex and demanding pro-cedure for the revamping of the He liquefier, its ancillary parts, other cryogenic parts of the CS, with special atten-tion about the Piping and Instrumentation, gas analysis, Heat Exchangers, LN2 transfer lines, Human-Machine Interface, vacuum system for thermal isolation, GHe re-covery system and the optimization for the consumption of electrical power. In conclusion we describe some hypothesis about the future upgrade of the Cryogenic system and the new Cry-ostat of the CS, in special way we analyse an approach to redefine the interconnection, piping boundary line and cryogenic diagnostic.
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THP19	Operational Status of the University of Washington Medical Cyclotron Facility	proton, neutron, controls, cyclotron	351
	R.C. Emery, E.F. Dorman University of Washington Medical Center, Seattle, Washington, USA
	The University of Washington Medical Cyclotron Facility (UWMCF) is built around a Scanditronix MC-50 compact cyclotron that was commissioned 1983 and that has been in continual use since. Its primary purpose is the production of 50.5 MeV protons for fast neutron therapy. While this proton energy is too low for proton therapy, it is ideal for research in small animal models. In addition to the protons used for fast neutron therapy and proton therapy research, UWMCF is able to accelerate other particles at variable energies. This makes it ideal for medical isotope research, including isotopes such as 211At, 186Re, and 117mSn that are being developed to target and treat metastatic disease at the cellular level. Most recent upgrades to the facility have been to the control systems. The original accelerator and therapy control systems were run on a DEC PDP-11 with a custom centralized i/o system built around the Z80 processor and chipset. Over the last 10 years we have continually been upgrading the controls while remaining operational, moving to a distributed system developed with the open source Experimental Physics and Industrial Control System (EPICS) toolkit.
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Other Keywords

Page

MOC01

Radiation Damage of Components in the Environment of High-Power Proton Accelerators

lattice, target, proton, simulation

24

D.C. Kiselev, R.M. Bergmann, R. Sobbia, V. Talanov, M. Wohlmuther
PSI, Villigen PSI, Switzerland

At high power accelerators, radiation damage becomes an issue particularly for components which are hit directly by the beam, like targets and collimators. Protons and secondary particles change the microscopic (lattice) structure of the materials, which macroscopically affects physical and mechanical properties. Examples are the decrease of thermal conductivity and ductility as well as dimensional changes. However, the prediction of these damage effects and their evolution in this harsh environment is highly complex as they strongly depend on parameters such as the irradiation temperature of the material, and the energy and type of particle inducing the damage. The so-called term "displacements per atom" (DPA) is an attempt to quantify the amount of radiation induced damage and to compare the micro- and macroscopic effects of radiation damage caused by different particles at different energies. In this talk, the basics for understanding of the mechanisms of radiation damage will be explained. The definition and determination of DPA and its limitations will be discussed. Measurements and examples of the impact of radiation damage on accelerator components will be presented.

Slides MOC01 [8.493 MB]

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP05

An Air Ionization Chamber Simulation using Monte Carlo Method

simulation, detector, cathode, photon

57

S.G. Hou, Shizhong. An, Z.W. Liu, G.F. Song, F. Wang, L.P. Wen, T.J. Zhang
CIAE, Beijing, People's Republic of China

The CYCIAE-100 cyclotron has been built at CIAE, designed to achieve 200 μA protons at 100 MeV and deliver them to several experimental targets. To achieve this goal and protect the machine from excessive radiation activation, an uncontrolled loss criteria of 1uA has been specified. Previous calculation for radiation shielding showed that high neutron and gamma were produced under this condition. To measure the high energy gamma ray(about 2 MeV ) at machine running and void damage by the prompt radiation, an air ionization chamber was designed to fulfill this goal. A Geant4 program was developed to simulate the energy response of detectors, the EM filed data was also taken into consideration in the programl. The simulation results indicate that the energy response linearity satisfies the requirement of the project specification.

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP12

Fast Scanning Beamline Design Applied to Proton Therapy System Based on Superconducting Cyclotrons

proton, cyclotron, dipole, emittance

79

B. Qin, Q.S. Chen, K. Fan, M. Fan, K.F. Liu, P. Tan
HUST, Wuhan, People's Republic of China
W. Chen, Z.K. Liang, X. Liu, T. Yu
Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People's Republic of China

Funding: Work supported by The National Key Research and Development Pro-gram of China, with grant No. 2016YFC0105305
Proton therapy is recognized as one of the most effec-tive radiation therapy method for cancers. The super-conducting cyclotron becomes an optimum choice for delivering high quality CW proton beam with features including compactness, low power consuming and higher extraction efficiency. This paper introduces de-sign considerations of the beamline with fast scanning features for proton therapy system based on supercon-ducting cyclotrons. The beam optics, the energy selec-tion system (ESS) and the gantry beamline will be de-scribed.

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP18

Activities for Isotope Sample Production and Radiation Effect Tests at JULIC/COSY Jülich

proton, cyclotron, target, experiment

98

O. Felden, M. Bai, R. Gebel, R. Hecker
FZJ, Jülich, Germany

At the Forschungszentrum Jülich (FZJ) the intermediate energy cyclotron JULIC, used as injector of the Cooler Synchrotron (COSY) and COSY itself, have been enabled to perform low to medium current irradiations. Main task is to support the FZJ radionuclide research programme of INM-5. Target holders of the INM-5 were implemented to the external target station of JULIC to obtain reliable irradiations with 45 MeV protons and 76 MeV deuterons for nuclear reaction cross section measurements and medical radionuclide production. For testing of radiation effects, displacement damage DD and single event effects SEE, with energetic protons for electronics used in space and accelerators the beam can be extracted to a dedicated test stand, e.g. used by Fraunhofer INT. To provide these possibilities up to 2.5 GeV as well one external beamline of the cooler synchrotron COSY will be equipped with a new irradiation station and adaption for the dosimetry systems are done. Different dosimetry systems (PTW Farmer® chambers, Bragg Peak chambers, Gafchromic® dosimetry films) are available to monitor and control the ongoing irradiation. This report briefly summarizes the relevant technical activities.

Poster MOP18 [4.196 MB]

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP21

Test Production of Ti-44 using RFT-30 Cyclotron

target, proton, cyclotron, positron

108

E.J. Lee, M.G. Hur, Y.B. Kong
KAERI, Daejon, Republic of Korea

RFT-30 30 MeV cyclotron has been developed for the production of radioisotopes and their applications. Fluorine-18, which is a widely-used positron emitter, has been produced regularly since 2015. In addition, research on the production of generator radioisotopes has been performed using this cyclotron. A generator means a device used to extract the positron-emitting daughter radioisotope from a source of the decaying parent radioisotope such as Ti-44 and Ge-68. In this research, gold-coated and natural Sc targets were proton-irradiated in order to produce Ti-44. Gamma spectra of irradiated targets were measured to confirm the production of Ti-44.

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP22

Simulation of Optimum Thickness and Configuration of 10 MeV Cyclotron Shield

neutron, cyclotron, shielding, simulation

110

S. Azizpourian, H. Afarideh, M. Afkhami Karaei, M. Mousavinia
AUT, Tehran, Iran
F. Abbasi Davani
Shahid Beheshti University, Tehran, Iran

Baby Cyclotrons that made in Self-shield type have been employed for use in Medical center for the diagnosis of cancer diseases by positron emission tomography (PET) system. Here in we have done a discussion on gamma and neutron dose rates at a distance of one meter outside of the cyclotron shielding. This shield consist of Lead, polyethylene borated (10% Boron) layers from inside to outside respectively. With increasing the thickness of lead and polyethylene we will see a decrease in the gamma and neutron dose which received by the water phantom at a distance of one meter outside from the surface of the shield of the cyclotron. Note that the gamma and neutron dose at the beginning (without any shielding) was on the order of several thousand μSv per hour that by achieve to a certain amount of thickness of the shield, the dose was reduced to below of the limited level. In this study, the MCNPX Code has been used. In MCNPX Code that used the variance reduction techniques for decreasing relative errors of calculation which was a good method for this case study.

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOE02

A Multi-leaf Faraday Cup Especially for Proton Therapy of Ocular Tumors

proton, ion, cyclotron, target

118

S. Seidel, J. Bundesmann, T. Damerow, A. Denker, C.S.G. Kunert
HZB, Berlin, Germany
A. Weber
Charite, Berlin, Germany

In cooperation with the university hospital Charité – Universitätsmedizin Berlin the Helmholtz-Zentrum Berlin (HZB) provides a proton beam used for radiation therapy of intraocular tumors. The protons are accelerated to 68 MeV by an isochronous cyclotron as the main accelerator. The human eye is a very small and complex organ with several critical structures which must be spared from irradiation as much as possible. Hence radiation therapy with protons is especially convenient due to their well-defined Bragg peak. At the HZB the distal fall off (the distance between 90% and 10% of the dose level) is less than 1 mm in water. Therefore it is crucial to measure the energy and maximum range of the beam with the corresponding high accuracy. A Multi-Leaf Faraday Cup (MLFC) allows a quick and precise range-measurement of proton beams. We present a MLFC which meets those special requirements of the eye tumor therapy. Results of range-measurements in different energy regions revealing the achievable submillimeter precession are shown; and examples for applications in radiation hardness testing are given.

Slides MOE02 [2.082 MB]

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUB03

A Novel Use oF FFAGs in ERLs - in Colliders: eRHIC, LHeC and a Prototype at Cornell University

electron, linac, collider, ion

140

D. Trbojevic, I. Ben-Zvi, J.S. Berg, M. Blaskiewicz, S.J. Brooks, K.A. Brown, W. Fischer, Y. Hao, V. Litvinenko, G.J. Mahler, W. Meng, F. Méot, M.G. Minty, S. Peggs, V. Ptitsyn, T. Roser, P. Thieberger, N. Tsoupas, J.E. Tuozzolo, H. Witte
BNL, Upton, Long Island, New York, USA
J. Barley, A.C. Bartnik, I.V. Bazarov, J.A. Crittenden, J. Dobbins, B.M. Dunham, R.G. Eichhorn, F. Furuta, R.E. Gallagher, G.H. Hoffstaetter, Y. Li, W. Lou, C.E. Mayes, J.R. Patterson, D.M. Sabol, D. Sagan, K.W. Smolenski, R.M. Talman
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
S.A. Bogacz, D. Douglas, T. Satogata
JLab, Newport News, Virginia, USA

Funding: New York State
We propose a novel use of Fixed Field Altrenating Gradient beam line (FFAG) to replace multiple beam lines in existing ERL's (4-pass at Novosibirsk, ERL of CEBAF, ERL at KEK, etc.) with a single FFAG beam line connected with spreaders and combiners to the linac. We present two designs for the Electron Ion Colliders one at CERN LHeC and one at Brookhaven National Laboratory to be placed in the tunnel of the existing Relativistic Heavy Ion Collider (RHIC) called eRHIC. The proof of principle electron accelerator with the FFAG arc is to be built at Cornell University Wilson Hall where there are already available injector, superconducting linac accelerator and the dump. There are very new developments in the FFAG design never accomplished before: arc-to straight adiabatic matching with merged multiple orbits into one, permanent magnet design for the arc and straights with ability of four times in energy, etc.

Slides TUB03 [23.650 MB]

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THP10

Status and Upgrade of the Cryogenic Plant of the LNS Superconducting Cyclotron After 25 Years of Operation

cryogenics, cyclotron, extraction, vacuum

325

F. Noto, M. Cafici, A. Carbonaro, A. Di Stefano, A. Pagano, F. Speziale
INFN/LNS, Catania, Italy

The Superconducting Cyclotron (CS) is a compact ac-celerator with three sectors with a wide operating dia-gram, capable of accelerating heavy ions with values q/A from 0.1 to 0.5 up to energies from 10 to 80 MeV/u. An upgrade of the CS superconducting magnet is in progress to extend the capability of the machine to high intensity beam facilities. In this paper we describe the status of CS Cryostat and its Cryogenic Plant after 25 years of continuous opera-tions at 4.2 K with the exception of the stop of about one year for the tenth test and the stop for restoring of the liquefier and the main issues happened during that long time. We describe the last complex and demanding pro-cedure for the revamping of the He liquefier, its ancillary parts, other cryogenic parts of the CS, with special atten-tion about the Piping and Instrumentation, gas analysis, Heat Exchangers, LN2 transfer lines, Human-Machine Interface, vacuum system for thermal isolation, GHe re-covery system and the optimization for the consumption of electrical power. In conclusion we describe some hypothesis about the future upgrade of the Cryogenic system and the new Cry-ostat of the CS, in special way we analyse an approach to redefine the interconnection, piping boundary line and cryogenic diagnostic.

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THP19

Operational Status of the University of Washington Medical Cyclotron Facility

proton, neutron, controls, cyclotron

351

R.C. Emery, E.F. Dorman
University of Washington Medical Center, Seattle, Washington, USA

The University of Washington Medical Cyclotron Facility (UWMCF) is built around a Scanditronix MC-50 compact cyclotron that was commissioned 1983 and that has been in continual use since. Its primary purpose is the production of 50.5 MeV protons for fast neutron therapy. While this proton energy is too low for proton therapy, it is ideal for research in small animal models. In addition to the protons used for fast neutron therapy and proton therapy research, UWMCF is able to accelerate other particles at variable energies. This makes it ideal for medical isotope research, including isotopes such as 211At, 186Re, and 117mSn that are being developed to target and treat metastatic disease at the cellular level. Most recent upgrades to the facility have been to the control systems. The original accelerator and therapy control systems were run on a DEC PDP-11 with a custom centralized i/o system built around the Z80 processor and chipset. Over the last 10 years we have continually been upgrading the controls while remaining operational, moving to a distributed system developed with the open source Experimental Physics and Industrial Control System (EPICS) toolkit.

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)