Cyclotrons2016 - List of Keywords (vacuum)

Paper	Title	Other Keywords	Page
MOA02	Upgrade of the LNS Superconducting Cyclotron for Beam Power Higher than 2-5 kW	cyclotron, extraction, ion, acceleration	7
	L. Calabretta, A. Calanna, G. Cuttone, G. D'Agostino, D. Rifuggiato, A.D. Russo INFN/LNS, Catania, Italy
	The LNS Superconducting Cyclotron has been in operation for more than 20 years, delivering to users a considerable variety of ion species from H to Pb, with energy in the range 10 to 80 A MeV. Up to now the maximum beam power has been limited to 100 W due to the beam dissipation in the electrostatic deflectors. To fulfill the users request, aiming to study rare processes in Nuclear Physics, the beam power has been planned to be increased up to 2-10 kW for ions with mass lower than 40 a.m.u., to be extracted by stripping. This development will maintain the present performance of the machine, i.e. the existing extraction mode will be maintained for all the ion species allowed by the operating diagram. To achieve this goal, a significant refurbishing operation of the cyclotron is needed, including a new cryostat with new superconducting coils, a new extraction channel with a large vertical gap, additional penetrations to host new magnetic channels and new compensation bars. Moreover the vacuum in the acceleration chamber is planned to be improved by replacing the liners and the trim coils. A general description of the refurbishing project will be presented.
	Slides MOA02 [11.857 MB]
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MOB01	Cyclotron Technology and Beam Dynamics for Microbeam Applications	ion, cyclotron, acceleration, controls	16
	S. Kurashima, H. Kashiwagi, N. Miyawaki, S. Okumura, T. Satoh, K. Yoshida, T. Yuyama QST/Takasaki, Takasaki, Japan M. Fukuda RCNP, Osaka, Japan
	We have been improving a beam quality of the TIARA (Takasaki Ion accelerators for Advanced Radiation Application) cyclotron to form a heavy-ion microbeam with a spot size about 1 μm. The microbeam is used to irradiate such as living cells and semiconductor devices. In order to form the microbeam using focusing lenses, an energy spread on the order of 10^-4 is required to eliminate chromatic aberration in the focusing lenses. A flat-top acceleration system using the fifth-harmonic frequency of the acceleration frequency was installed in the cyclotron to reduce the energy spread. In addition, a new center region, a magnetic field stabilization system and an acceleration phase control technique were developed to provide the microbeam stably for beam users. The energy spread of a 260 MeV Ne beam was reduced to 0.05% by the flat-top acceleration, and the microbeam with a spot size of approximately 1 um was successfully formed. However it takes about 8 h to tune the cyclotron and the focusing lenses. A cocktail beam acceleration technique was introduced to quickly change the microbeam to the other one within 0.5 h, and several microbeams can be used in a beam time as a result.
	Slides MOB01 [26.045 MB]
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TUA01	Offline Tests with the NSCL Cyclotron Gas Stopper	ion, cyclotron, extraction, cryogenics	121
	S. Schwarz, K.R. Lund, D.J. Morrissey, J. Ottarson, C. Sumithrarachchi NSCL, East Lansing, Michigan, USA G. Bollen, S. Chouhan, J. DeKamp, M.A. Green, C. Magsig, A.C.C. Villari, A.F. Zeller FRIB, East Lansing, Michigan, USA G. Bollen MSU, East Lansing, Michigan, USA
	Funding: This work is supported by NSF under grants PHY-09-58726 and PHY-11-02511 Rare isotopes are produced at the NSCL by projectile fragmentation at energies of ~100 MeV/u. The NSCL has successfully used linear gas stopping cells for more than a decade to decelerate projectile fragments to the keV range; first for experiments at low-energy and more recently for reacceleration. A novel reverse-cyclotron has been constructed by the NSCL based on a superconducting sectored-cyclotron magnet and LN2-cooled He gas to confine and slow down the fragments. Efficient stopping is predicted even for light ions that are difficult to thermalize in linear gas cells. The thermalized ions are transported to the center by a radial RF-carpet system, extracted through the yoke with an ion conveyor and accelerated to <60 keV for delivery to users. Measured field profiles have confirmed field calculations. The cryogenic beam-stopping chamber has been installed inside the magnet. The RF ion-guiding components have been tested successfully offline and are being prepared for low-energy ion-transport tests inside the magnet. A summary of the expected performance, the status of the machine, and results from recent low-energy transport tests will be presented.
	Slides TUA01 [3.816 MB]
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TUP06	Design of the Cyclone®70p	cyclotron, cavity, proton, acceleration	175
	S. Zaremba, M. Abs, J.L. Delvaux, W.J.G.M. Kleeven, B. Nactergal, V. Nuttens, J. van de Walle IBA, Louvain-la-Neuve, Belgium
	The IBA CYCLONE®70p is a high intensity 70 MeV proton-only cyclotron dedicated to the production of radioisotopes for PET generators and SPECT. The nominal power of the extracted beam goes above 50kW (750μA@70MeV). The proton-only cyclotron was developed based on the previous experience of the multi-particle Cyclone® 70XP running in Nantes, France. Numerical tools have been extensively used to optimize the magnetic field, to avoid potentially harmful resonances during acceleration and improve the acceleration efficiency of the cyclotron. In addition, electromagnetic and mechanical calculations permitted to obtain a low dissipated power and electromechanically robust design of the RF system. The vacuum computations have permitted to optimize the beam transmission, the placement and type of cryopumps. This new development of CYCLONE®70p was the initial part of the successfully finished IBA project also presented during this conference [1].
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TUP16	The High Quality Water Cooling System for a 100 MeV Cyclotron	cyclotron, operation, controls, target	205
	Z.G. Li, H.R. Cai, L.C. Cao, T. Ge, G.G. Liu, J.Y. Wei, L.C. Wu, J.J. Yang CIAE, Beijing, People's Republic of China
	A high quality water cooling system with total heat power dissipation of 500 kW has been built and successfully used for a 100 MeV high intensity Cyclotron. The main features of this system are high water quality with specific conductivity bellow 0.5 μS/cm, high cooling water temperature stability better than ±0.1°C for long time operation and much electric power-saving in comparing with classical design. For some special usages, such as high beam power target and vacuum helium compressor, they all are well treated and reasonably separated from the main cooling system. There are totally 108 distributed water branches together for different sub-equipments of the cyclotron. At each branch, there are one water flow switch for safe interlock, one flow meter for monitoring, one temperature sensor for remote diagnostics. The water cooling system is under automatic control with PLC, and its operation status and all parameters can be remotely monitored from the control room. All of the involved equipments can be switched on/off by one key, no on-duty staff is needed at normal conditions. This system has been put into commissioning for two years and proved successful and reliable.
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TUP22	PLC Control System for Vacuum and 20 Kw RF Amplifier	PLC, controls, cyclotron, operation	215
	H.S. Kim, J.-S. Chai, M. Ghergherehchi, D.H. Ha, J.C. Lee, S.C. Mun, H. Namgoong SKKU, Suwon, Republic of Korea
	Funding: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP:Ministry of Science, ICT and Future Planning) (NRF-2015M2B2A8A10058096) Since 2014, the Sungkyunkwan University has been upgrade 10 MeV cyclotron (SKKUCY-10) prototype for producing radio isotopes. For stable and robust cyclotron operation, local controller is main issue. Especially, RF and Vacuum is main part for control system and each sub system fault result in damage to the other sub systems. To solve those problem, we integrate RF amplifier and vacu-um local controller by LS PLC (Programmable Logic Controllers). Integrated Interlock event is also processed at one controller. This paper describe system requirement for RF amplifier and vacuum and discuss the detailed design and software development by PLC programming at SKKUCY -10
	Poster TUP22 [1.458 MB]
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TUD04	BEST 70P Cyclotron Commissioning at INFN LN Legnaro	cyclotron, target, acceleration, operation	241
	V. Sabaiduc, M. Carlson, D. Du, T. Evans, L. AC. Piazza, V. Ryjkov, I. Tarnopolski, P. Zanetti Best Theratronics Ltd., Ottawa, Ontario, Canada T. Boiesan, R.R. Johnson, W. Stazyk, K. Suthanthiran, S. Talmor, J. Zhu BCSI, Vancouver, Canada
	Best Cyclotron Systems Inc (BCSI) designed and manufactured a 70 MeV compact cyclotron for radioisotope production and research applications. The cyclotron has been build at Best Theratronics facility in Ottawa, Canada for the INFN-LNL laboratory in Legnaro, Italy. The cyclotron has external negative hydrogen ion source, four radial sectors with two separated dees in opposite valleys, cryogenic vacuum system and simultaneous beam extraction on opposite lines. The beam intensity is 700 microamps with variable extraction energy between 35 and 70 MeV. The beam commissioning performances at the customer site are reported.
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THP01	Development and Validation of a Fast Cryocooler Maintenance System	operation, controls, cryogenics, ion	301
	V. Nuttens, E. Forton, T. Lamon, Y. Paradis IBA, Louvain-la-Neuve, Belgium A. Zhukovsky M.I.T. Plasma Science and Fusion Center, Cambridge, USA
	At IBA, we have been developing and testing new systems to simplify cryocooler maintenance at a minimal cost (material, interruption of service). A local heating system has been designed to heat-up both stages of a cryocooler to room temperature while keeping the cold mass at a low temperature. The heating system has to fulfill severe requirements such as high power density, compatibility with vacuum and low temperature, and easy operation. The whole system has been designed and tested in a dedicated test bench and then duplicated onto a full-size superconducting coil. It has been extensively tested under different conditions to prove that the heating system is robust and reliable and has no impact on the superconducting coil performance.
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THP03	Operation and Maintenance of RF System of 520 MeV TRIUMF Cyclotron	operation, cyclotron, TRIUMF, simulation	307
	N.V. Avreline, T. Au, C.D. Bartlett, I.V. Bylinskii, B. Jakovljevic, V. Zvyagintsev TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada C.D. Bartlett University of Victoria, Victoria BC, Canada
	1 MW CW 23 MHz RF system of the TRIUMF 520 MeV Cyclotron has been in operation for over 40 years. Continuous development of the RF power amplifiers, the waveguide system and of the measurement and protection devices provides reliable operation and improves the performance of the RF System. In this article, operation and maintenance procedure of this RF system are analyzed and recent as well as future upgrades are being analyzed and discussed. In particular, we discuss the improvements of the transmission line's VSWR monitor and their effect on the protection of the RF system against RF breakdowns and sparks. We discuss the new version of input circuit that was installed, tested and is currently used in the final stage of RF power amplifier. We analyze various schematics and configurations of the Intermediate Power Amplifier (IPA) to be used in the future. The thermo-condition improvements of the Dee voltage probe's rectifiers are described.
	Poster THP03 [2.215 MB]
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THP07	Development of Control System for 10 MeV Cyclotron	controls, cyclotron, PLC, power-supply	319
	M. Hassani, H. Afarideh, Y. Ghorashinejad AUT, Tehran, Iran
	AmirKabir University of Technology is developing a 10 MeV cyclotron to produce radio isotopes. In order to operate the cyclotron stably, all sub-systems in the cyclotron are controlled and monitored consistently. The control system has been developed based on PLC and the operation is monitored by HMI permanently. Also, the control console located in the control room, provides data logging and controlling different steps of operation by the operator. In addition, the system can be remotely accessed over the network to monitor the status of cyclotron easily. The configuration of the control system for 10MeV cyclotron will be presented in this paper.
	Poster THP07 [1.257 MB]
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THP10	Status and Upgrade of the Cryogenic Plant of the LNS Superconducting Cyclotron After 25 Years of Operation	cryogenics, cyclotron, extraction, radiation	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.
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THP18	Suppression of RF Radiation Originating from the Flattop Cavity in the PSI Ring Cyclotron	cavity, flattop, cyclotron, pick-up	348
	M. Schneider, A. Adelmann, N. Pogue, L. Stingelin PSI, Villigen PSI, Switzerland
	In the PSI Ring cyclotron, protons are accelerated from 72 MeV to 590 MeV. In several upgrade programs, the beam current was increased from the initial design value of 100 μA up to 2.4 mA. The rf-system of this separated sector cyclotron consists of 4 copper cavities running at 50 MHz for the main acceleration. For the purpose of increasing the phase acceptance of the Ring, an aluminum flattop cavity is operated at a gap voltage of 555 kVp at the 3rd harmonic frequency. As a result of the progressively increased flattop voltage, this cavity was pushed toward its mechanical and electrical limits. As a consequence rf-power is leaking into the cyclotrons vacuum chamber, which in turn caused several problems. A visible effect was the formation of plasma in the vacuum chamber . In the last shutdown, an attempt was made to reduce the radiated rf-power. On the vacuum sealing between the flattop cavity and sector magnet 6, a shim was installed which reduces the gap for the beam from 60mm to 25mm in height. Results of this intervention will be presented and compared with finite element model simulations . N.J. Pogue et al. NIM-A: Volume 821, 11 June 2016, pp. 87 - 92. ** N.J. Pogue et al. NIM-A: Volume 828, 21 August 2016, pp. 156 - 162.
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THP25	Status of the DC-280 Cyclotron Project	ion, cyclotron, focusing, injection	363
	I.V. Kalagin, S.L. Bogomolov, S.N. Dmitriev, B. Gikal, G.G. Gulbekyan, I.A. Ivanenko, G.N. Ivanov, N.Yu. Kazarinov, Y.T. Oganessian, N.F. Osipov JINR, Dubna, Moscow Region, Russia
	The current status of the DC-280 cyclotron project is presented. The DC-280 will be the basic facility of the Super Heavy Element Factory which is being created at the FLNR JINR. The main parts of the DC-280 are already made. In according to FLNR plans the cyclotron has to be assembled and will be ready to the first run by the end of 2017.
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FRB03	Proton Radiography Experiment Based on a 100 MeV Proton Cyclotron	proton, cyclotron, experiment, controls	401
	J.J. Yang, H.R. Cai, L.C. Cao, T. Ge, Z.G. Li, Y.L. Lv, F. Wang, S.M. Wei, L.P. Wen, S.P. Zhang, T.J. Zhang, Y.W. Zhang, X. Zhen CIAE, Beijing, People's Republic of China
	A proof-of-principle test-stand for proton radiography is under construction at China Institute of Atomic Energy (CIAE). This test-stand will utilize the 100 MeV proton beam provided by the compact cyclotron CYCIAE-100, which has been built in the year of 2014, to radiograph thin static objects. The assembling of the test-stand components is finished by now. We will carry out the first proton radiography experiment in this July and hopefully we can get the first image before the opening of this conference. In this paper, the designing, constructing and commissioning of the proton radiography system will be described and the experiment result will be presented and discussed.
	Slides FRB03 [2.764 MB]
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Paper

Title

Other Keywords

Page

MOA02

Upgrade of the LNS Superconducting Cyclotron for Beam Power Higher than 2-5 kW

cyclotron, extraction, ion, acceleration

7

L. Calabretta, A. Calanna, G. Cuttone, G. D'Agostino, D. Rifuggiato, A.D. Russo
INFN/LNS, Catania, Italy

The LNS Superconducting Cyclotron has been in operation for more than 20 years, delivering to users a considerable variety of ion species from H to Pb, with energy in the range 10 to 80 A MeV. Up to now the maximum beam power has been limited to 100 W due to the beam dissipation in the electrostatic deflectors. To fulfill the users request, aiming to study rare processes in Nuclear Physics, the beam power has been planned to be increased up to 2-10 kW for ions with mass lower than 40 a.m.u., to be extracted by stripping. This development will maintain the present performance of the machine, i.e. the existing extraction mode will be maintained for all the ion species allowed by the operating diagram. To achieve this goal, a significant refurbishing operation of the cyclotron is needed, including a new cryostat with new superconducting coils, a new extraction channel with a large vertical gap, additional penetrations to host new magnetic channels and new compensation bars. Moreover the vacuum in the acceleration chamber is planned to be improved by replacing the liners and the trim coils. A general description of the refurbishing project will be presented.

Slides MOA02 [11.857 MB]

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MOB01

Cyclotron Technology and Beam Dynamics for Microbeam Applications

ion, cyclotron, acceleration, controls

16

S. Kurashima, H. Kashiwagi, N. Miyawaki, S. Okumura, T. Satoh, K. Yoshida, T. Yuyama
QST/Takasaki, Takasaki, Japan
M. Fukuda
RCNP, Osaka, Japan

We have been improving a beam quality of the TIARA (Takasaki Ion accelerators for Advanced Radiation Application) cyclotron to form a heavy-ion microbeam with a spot size about 1 μm. The microbeam is used to irradiate such as living cells and semiconductor devices. In order to form the microbeam using focusing lenses, an energy spread on the order of 10^-4 is required to eliminate chromatic aberration in the focusing lenses. A flat-top acceleration system using the fifth-harmonic frequency of the acceleration frequency was installed in the cyclotron to reduce the energy spread. In addition, a new center region, a magnetic field stabilization system and an acceleration phase control technique were developed to provide the microbeam stably for beam users. The energy spread of a 260 MeV Ne beam was reduced to 0.05% by the flat-top acceleration, and the microbeam with a spot size of approximately 1 um was successfully formed. However it takes about 8 h to tune the cyclotron and the focusing lenses. A cocktail beam acceleration technique was introduced to quickly change the microbeam to the other one within 0.5 h, and several microbeams can be used in a beam time as a result.

Slides MOB01 [26.045 MB]

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TUA01

Offline Tests with the NSCL Cyclotron Gas Stopper

ion, cyclotron, extraction, cryogenics

121

S. Schwarz, K.R. Lund, D.J. Morrissey, J. Ottarson, C. Sumithrarachchi
NSCL, East Lansing, Michigan, USA
G. Bollen, S. Chouhan, J. DeKamp, M.A. Green, C. Magsig, A.C.C. Villari, A.F. Zeller
FRIB, East Lansing, Michigan, USA
G. Bollen
MSU, East Lansing, Michigan, USA

Funding: This work is supported by NSF under grants PHY-09-58726 and PHY-11-02511
Rare isotopes are produced at the NSCL by projectile fragmentation at energies of ~100 MeV/u. The NSCL has successfully used linear gas stopping cells for more than a decade to decelerate projectile fragments to the keV range; first for experiments at low-energy and more recently for reacceleration. A novel reverse-cyclotron has been constructed by the NSCL based on a superconducting sectored-cyclotron magnet and LN2-cooled He gas to confine and slow down the fragments. Efficient stopping is predicted even for light ions that are difficult to thermalize in linear gas cells. The thermalized ions are transported to the center by a radial RF-carpet system, extracted through the yoke with an ion conveyor and accelerated to <60 keV for delivery to users. Measured field profiles have confirmed field calculations. The cryogenic beam-stopping chamber has been installed inside the magnet. The RF ion-guiding components have been tested successfully offline and are being prepared for low-energy ion-transport tests inside the magnet. A summary of the expected performance, the status of the machine, and results from recent low-energy transport tests will be presented.

Slides TUA01 [3.816 MB]

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TUP06

Design of the Cyclone®70p

cyclotron, cavity, proton, acceleration

175

S. Zaremba, M. Abs, J.L. Delvaux, W.J.G.M. Kleeven, B. Nactergal, V. Nuttens, J. van de Walle
IBA, Louvain-la-Neuve, Belgium

The IBA CYCLONE®70p is a high intensity 70 MeV proton-only cyclotron dedicated to the production of radioisotopes for PET generators and SPECT. The nominal power of the extracted beam goes above 50kW (750μA@70MeV). The proton-only cyclotron was developed based on the previous experience of the multi-particle Cyclone® 70XP running in Nantes, France. Numerical tools have been extensively used to optimize the magnetic field, to avoid potentially harmful resonances during acceleration and improve the acceleration efficiency of the cyclotron. In addition, electromagnetic and mechanical calculations permitted to obtain a low dissipated power and electromechanically robust design of the RF system. The vacuum computations have permitted to optimize the beam transmission, the placement and type of cryopumps. This new development of CYCLONE®70p was the initial part of the successfully finished IBA project also presented during this conference [1].

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TUP16

The High Quality Water Cooling System for a 100 MeV Cyclotron

cyclotron, operation, controls, target

205

Z.G. Li, H.R. Cai, L.C. Cao, T. Ge, G.G. Liu, J.Y. Wei, L.C. Wu, J.J. Yang
CIAE, Beijing, People's Republic of China

A high quality water cooling system with total heat power dissipation of 500 kW has been built and successfully used for a 100 MeV high intensity Cyclotron. The main features of this system are high water quality with specific conductivity bellow 0.5 μS/cm, high cooling water temperature stability better than ±0.1°C for long time operation and much electric power-saving in comparing with classical design. For some special usages, such as high beam power target and vacuum helium compressor, they all are well treated and reasonably separated from the main cooling system. There are totally 108 distributed water branches together for different sub-equipments of the cyclotron. At each branch, there are one water flow switch for safe interlock, one flow meter for monitoring, one temperature sensor for remote diagnostics. The water cooling system is under automatic control with PLC, and its operation status and all parameters can be remotely monitored from the control room. All of the involved equipments can be switched on/off by one key, no on-duty staff is needed at normal conditions. This system has been put into commissioning for two years and proved successful and reliable.

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TUP22

PLC Control System for Vacuum and 20 Kw RF Amplifier

PLC, controls, cyclotron, operation

215

H.S. Kim, J.-S. Chai, M. Ghergherehchi, D.H. Ha, J.C. Lee, S.C. Mun, H. Namgoong
SKKU, Suwon, Republic of Korea

Funding: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP:Ministry of Science, ICT and Future Planning) (NRF-2015M2B2A8A10058096)
Since 2014, the Sungkyunkwan University has been upgrade 10 MeV cyclotron (SKKUCY-10) prototype for producing radio isotopes. For stable and robust cyclotron operation, local controller is main issue. Especially, RF and Vacuum is main part for control system and each sub system fault result in damage to the other sub systems. To solve those problem, we integrate RF amplifier and vacu-um local controller by LS PLC (Programmable Logic Controllers). Integrated Interlock event is also processed at one controller. This paper describe system requirement for RF amplifier and vacuum and discuss the detailed design and software development by PLC programming at SKKUCY -10

Poster TUP22 [1.458 MB]

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TUD04

BEST 70P Cyclotron Commissioning at INFN LN Legnaro

cyclotron, target, acceleration, operation

241

V. Sabaiduc, M. Carlson, D. Du, T. Evans, L. AC. Piazza, V. Ryjkov, I. Tarnopolski, P. Zanetti
Best Theratronics Ltd., Ottawa, Ontario, Canada
T. Boiesan, R.R. Johnson, W. Stazyk, K. Suthanthiran, S. Talmor, J. Zhu
BCSI, Vancouver, Canada

Best Cyclotron Systems Inc (BCSI) designed and manufactured a 70 MeV compact cyclotron for radioisotope production and research applications. The cyclotron has been build at Best Theratronics facility in Ottawa, Canada for the INFN-LNL laboratory in Legnaro, Italy. The cyclotron has external negative hydrogen ion source, four radial sectors with two separated dees in opposite valleys, cryogenic vacuum system and simultaneous beam extraction on opposite lines. The beam intensity is 700 microamps with variable extraction energy between 35 and 70 MeV. The beam commissioning performances at the customer site are reported.

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THP01

Development and Validation of a Fast Cryocooler Maintenance System

operation, controls, cryogenics, ion

301

V. Nuttens, E. Forton, T. Lamon, Y. Paradis
IBA, Louvain-la-Neuve, Belgium
A. Zhukovsky
M.I.T. Plasma Science and Fusion Center, Cambridge, USA

At IBA, we have been developing and testing new systems to simplify cryocooler maintenance at a minimal cost (material, interruption of service). A local heating system has been designed to heat-up both stages of a cryocooler to room temperature while keeping the cold mass at a low temperature. The heating system has to fulfill severe requirements such as high power density, compatibility with vacuum and low temperature, and easy operation. The whole system has been designed and tested in a dedicated test bench and then duplicated onto a full-size superconducting coil. It has been extensively tested under different conditions to prove that the heating system is robust and reliable and has no impact on the superconducting coil performance.

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THP03

Operation and Maintenance of RF System of 520 MeV TRIUMF Cyclotron

operation, cyclotron, TRIUMF, simulation

307

N.V. Avreline, T. Au, C.D. Bartlett, I.V. Bylinskii, B. Jakovljevic, V. Zvyagintsev
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
C.D. Bartlett
University of Victoria, Victoria BC, Canada

1 MW CW 23 MHz RF system of the TRIUMF 520 MeV Cyclotron has been in operation for over 40 years. Continuous development of the RF power amplifiers, the waveguide system and of the measurement and protection devices provides reliable operation and improves the performance of the RF System. In this article, operation and maintenance procedure of this RF system are analyzed and recent as well as future upgrades are being analyzed and discussed. In particular, we discuss the improvements of the transmission line's VSWR monitor and their effect on the protection of the RF system against RF breakdowns and sparks. We discuss the new version of input circuit that was installed, tested and is currently used in the final stage of RF power amplifier. We analyze various schematics and configurations of the Intermediate Power Amplifier (IPA) to be used in the future. The thermo-condition improvements of the Dee voltage probe's rectifiers are described.

Poster THP03 [2.215 MB]

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THP07

Development of Control System for 10 MeV Cyclotron

controls, cyclotron, PLC, power-supply

319

M. Hassani, H. Afarideh, Y. Ghorashinejad
AUT, Tehran, Iran

AmirKabir University of Technology is developing a 10 MeV cyclotron to produce radio isotopes. In order to operate the cyclotron stably, all sub-systems in the cyclotron are controlled and monitored consistently. The control system has been developed based on PLC and the operation is monitored by HMI permanently. Also, the control console located in the control room, provides data logging and controlling different steps of operation by the operator. In addition, the system can be remotely accessed over the network to monitor the status of cyclotron easily. The configuration of the control system for 10MeV cyclotron will be presented in this paper.

Poster THP07 [1.257 MB]

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THP10

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

cryogenics, cyclotron, extraction, radiation

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.

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THP18

Suppression of RF Radiation Originating from the Flattop Cavity in the PSI Ring Cyclotron

cavity, flattop, cyclotron, pick-up

348

M. Schneider, A. Adelmann, N. Pogue, L. Stingelin
PSI, Villigen PSI, Switzerland

In the PSI Ring cyclotron, protons are accelerated from 72 MeV to 590 MeV. In several upgrade programs, the beam current was increased from the initial design value of 100 μA up to 2.4 mA. The rf-system of this separated sector cyclotron consists of 4 copper cavities running at 50 MHz for the main acceleration. For the purpose of increasing the phase acceptance of the Ring, an aluminum flattop cavity is operated at a gap voltage of 555 kVp at the 3rd harmonic frequency. As a result of the progressively increased flattop voltage, this cavity was pushed toward its mechanical and electrical limits. As a consequence rf-power is leaking into the cyclotrons vacuum chamber, which in turn caused several problems. A visible effect was the formation of plasma in the vacuum chamber *. In the last shutdown, an attempt was made to reduce the radiated rf-power. On the vacuum sealing between the flattop cavity and sector magnet 6, a shim was installed which reduces the gap for the beam from 60mm to 25mm in height. Results of this intervention will be presented and compared with finite element model simulations **.
* N.J. Pogue et al.
NIM-A: Volume 821, 11 June 2016, pp. 87 - 92.
** N.J. Pogue et al.
NIM-A: Volume 828, 21 August 2016, pp. 156 - 162.

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THP25

Status of the DC-280 Cyclotron Project

ion, cyclotron, focusing, injection

363

I.V. Kalagin, S.L. Bogomolov, S.N. Dmitriev, B. Gikal, G.G. Gulbekyan, I.A. Ivanenko, G.N. Ivanov, N.Yu. Kazarinov, Y.T. Oganessian, N.F. Osipov
JINR, Dubna, Moscow Region, Russia

The current status of the DC-280 cyclotron project is presented. The DC-280 will be the basic facility of the Super Heavy Element Factory which is being created at the FLNR JINR. The main parts of the DC-280 are already made. In according to FLNR plans the cyclotron has to be assembled and will be ready to the first run by the end of 2017.

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FRB03

Proton Radiography Experiment Based on a 100 MeV Proton Cyclotron

proton, cyclotron, experiment, controls

401

J.J. Yang, H.R. Cai, L.C. Cao, T. Ge, Z.G. Li, Y.L. Lv, F. Wang, S.M. Wei, L.P. Wen, S.P. Zhang, T.J. Zhang, Y.W. Zhang, X. Zhen
CIAE, Beijing, People's Republic of China

A proof-of-principle test-stand for proton radiography is under construction at China Institute of Atomic Energy (CIAE). This test-stand will utilize the 100 MeV proton beam provided by the compact cyclotron CYCIAE-100, which has been built in the year of 2014, to radiograph thin static objects. The assembling of the test-stand components is finished by now. We will carry out the first proton radiography experiment in this July and hopefully we can get the first image before the opening of this conference. In this paper, the designing, constructing and commissioning of the proton radiography system will be described and the experiment result will be presented and discussed.

Slides FRB03 [2.764 MB]

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