Cyclotrons2013 - List of Keywords (impedance)

Paper	Title	Other Keywords	Page
TU2PB02	The New Axial Buncher at INFN-LNS	cyclotron, controls, vacuum, ion-source	147
	A.C. Caruso, G. Gallo, A. Longhitano INFN/LNS, Catania, Italy F. Consoli Associazione Euratom-ENEA sulla Fusione, Frascati (Rome), Italy P.Z. Li CIAE, Beijing, People's Republic of China J. Sura Warsaw University, Warsaw, Poland
	A new axial buncher for the K-800 superconducting cyclotron is under construction at LNS. This new device will replace the present buncher installed along the vertical beam line, inside the yoke of the cyclotron at about half a metre from the medium plane. Maintenance and technical inspection are very difficult to carry out in this situation. The new buncher will still be placed along the axial beam line, just before the bottom side of the cyclotron yoke. It consists of a drift tube driven by a sinusoidal RF signal in the range of 15-50 MHz, a matching box, an amplifier, and an electronic control system. A more accurate mechanical design of the beam line portion will allow for the direct electric connection of the matching box to the ceramic feed-through and drift tube. This particular design will minimize, or totally avoid, any connection through coaxial transmission line. It will reduce the entire geometry, the total RF power and the maintenance. In brief, the new axial buncher will be a compact system including beam line portion, drift tube, ceramic feed-through, matching box, amplifier and control system interface in a single structure.
	Slides TU2PB02 [7.623 MB]

TUPPT010	Variants of Grounding and Shielding in a Beam Diagnostics Measurement of Low Signal Currents	coupling, diagnostics, shielding, high-voltage	174
	R. Dölling PSI, Villigen PSI, Switzerland
	The performance of several variants of grounding and shielding of long measurements cables for small currents against ground potential differences has been estimated analytically.

TUPPT028	Development of 20 kW RF Amplifier for Compact Cyclotron	rf-amplifier, vacuum, cyclotron, cathode	212
	S.H. Lee, J.-S. Chai, T.V. Cong, H.S. Kim, Y.S. Lee, H.S. Song, Y.H. Yeon SKKU, Suwon, Republic of Korea J.H. Kim KIRAMS, Seoul, Republic of Korea
	Funding: This work was supported by Nuclear R&D program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology. (2012-0925001) Compact cyclotron for PET RI production accelerates H⁻ ions using electric field. For accelerating ions in cyclotron, RF amplifier is developed to transmit RF power to RF resonating cavity. RF amplifier generates high-power RF signal up to 20 kW with narrow band frequency. The amplifier device was used of triode vacuum tube operated in cathode-driven. Impedance matching systems were composed of bridge-network system. Components of impedance matching system had rigid structure to endure high-power RF signal. Variable inductors of matching components have been used of short-bar movement system for changing reactance of characteristic impedance. The experiment results were measured by VSWR meter and network analyzer.

TUPPT029	Design Study of a 83.2 MHz RF Cavity for the 9 MeV Compact Cyclotron	cavity, cyclotron, ion, simulation	215
	S. Shin, J.-S. Chai, J.C. Lee SKKU, Suwon, Republic of Korea B.N. Lee KAERI, Daejon, Republic of Korea
	Funding: National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (2010-0025953) A compact cyclotron accelerating H⁻ ion for producing a radioactive isotope FDG (FluoroDeoxyGlucose) for PET (Positron Emission Tomography) has been designed at Sungkyunkwan University. The H⁻ ion which generated from the PIG (Panning Ion Gauge) ion source will be accelerated at the normal conducting RF cavity which uses 83.2 MHz of resonance frequency and extracted at the carbon foil striper at the energy of 9 MeV. This cyclotron has to be small to install local hospital while FDG production needs more than 9 MeV of proton beam energy. Chasing two hare at once, deep valley type of magnet has been selected for high energy and compact cyclotron. Due to the small size of valley space where RF cavities will be installed, lots of difficulties have been introduced. Despite of those difficulties at the designing process, we could achieve resonance frequency of 83.2 MHz and Q-factor of 4500 with very compact size of RF cavity.

TUPPT030	Development of 1.5 kW RF Driver for Compact Cyclotron	cathode, vacuum, rf-amplifier, cyclotron	218
	H.S. Song, J.-S. Chai, T.V. Cong, S.Y. Jung, H.S. Kim, S.H. Lee, Y.S. Lee, S. Shin, Y.H. Yeon SKKU, Suwon, Republic of Korea J.H. Kim KIRAMS, Seoul, Republic of Korea
	1.5 kW RF driver is being designed and manufactured with the resonance frequency of 83.2 MHz. Triode (3CX1500A7) is used for RF power amplification, and ground grid amplifier (G.G. Amp.) type was adopted for this RF driver since the circuit design and realization is simple. Anode, and cathode voltage of RF driver is approximately 3500V, and 5V respectively. In this paper, impedance matching process of RF driver is described. Variable capacitor and variable inductor is utilized to implement the impedance matching for cathode and anode. In addition, RF power output characteristics compared with RF input is shown.

WE1PB03	COLUMBUS - A Small Cyclotron for School and Teaching Purposes	cyclotron, vacuum, ion, ion-source	296
	C.R. Wolf FZJ, Jülich, Germany M. J. Frank, E. Held Ernes, Coburg, Germany
	A small cyclotron has been constructed for school- and teaching purposes. The cyclotron uses a water-cooled magnet with adjustable pole-pieces. The magnet provides a field up to 0,7 T. Between the two poles the vacuum chamber is positioned. The vacuum chamber provides ports for the different subsystems, measuring tools and some viewports. A turbo molecular pump backed up by a dry compressor vacuum pump is used to evacuate the chamber to a pressure of 10^-5 mbar. The ions will be accelerated between two brass RF electrodes, called dee and dummy-dee. In the center of the chamber there is a thermionic ion source. A massflow controller fills it with hydrogen gas ionized by electrons from a cathode. The required 5,63 MHz RF power is supplied by a RF transceiver. A matchingbox adjusts the output impedance of the transceiver to the input impedance of the cyclotron. The expected final energies of the protons are 24 keV after 12 revolutions. At these energies there is no radiation outside the chamber. In addition to the design of this cyclotron it is the purpose of this dissertation to use standard devices to realize a low-cost solution.
	Slides WE1PB03 [6.246 MB]

Paper

Title

Other Keywords

Page

TU2PB02

The New Axial Buncher at INFN-LNS

cyclotron, controls, vacuum, ion-source

147

A.C. Caruso, G. Gallo, A. Longhitano
INFN/LNS, Catania, Italy
F. Consoli
Associazione Euratom-ENEA sulla Fusione, Frascati (Rome), Italy
P.Z. Li
CIAE, Beijing, People's Republic of China
J. Sura
Warsaw University, Warsaw, Poland

A new axial buncher for the K-800 superconducting cyclotron is under construction at LNS. This new device will replace the present buncher installed along the vertical beam line, inside the yoke of the cyclotron at about half a metre from the medium plane. Maintenance and technical inspection are very difficult to carry out in this situation. The new buncher will still be placed along the axial beam line, just before the bottom side of the cyclotron yoke. It consists of a drift tube driven by a sinusoidal RF signal in the range of 15-50 MHz, a matching box, an amplifier, and an electronic control system. A more accurate mechanical design of the beam line portion will allow for the direct electric connection of the matching box to the ceramic feed-through and drift tube. This particular design will minimize, or totally avoid, any connection through coaxial transmission line. It will reduce the entire geometry, the total RF power and the maintenance. In brief, the new axial buncher will be a compact system including beam line portion, drift tube, ceramic feed-through, matching box, amplifier and control system interface in a single structure.

Slides TU2PB02 [7.623 MB]

TUPPT010

Variants of Grounding and Shielding in a Beam Diagnostics Measurement of Low Signal Currents

coupling, diagnostics, shielding, high-voltage

174

R. Dölling
PSI, Villigen PSI, Switzerland

The performance of several variants of grounding and shielding of long measurements cables for small currents against ground potential differences has been estimated analytically.

TUPPT028

Development of 20 kW RF Amplifier for Compact Cyclotron

rf-amplifier, vacuum, cyclotron, cathode

212

S.H. Lee, J.-S. Chai, T.V. Cong, H.S. Kim, Y.S. Lee, H.S. Song, Y.H. Yeon
SKKU, Suwon, Republic of Korea
J.H. Kim
KIRAMS, Seoul, Republic of Korea

Funding: This work was supported by Nuclear R&D program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology. (2012-0925001)
Compact cyclotron for PET RI production accelerates H⁻ ions using electric field. For accelerating ions in cyclotron, RF amplifier is developed to transmit RF power to RF resonating cavity. RF amplifier generates high-power RF signal up to 20 kW with narrow band frequency. The amplifier device was used of triode vacuum tube operated in cathode-driven. Impedance matching systems were composed of bridge-network system. Components of impedance matching system had rigid structure to endure high-power RF signal. Variable inductors of matching components have been used of short-bar movement system for changing reactance of characteristic impedance. The experiment results were measured by VSWR meter and network analyzer.

TUPPT029

Design Study of a 83.2 MHz RF Cavity for the 9 MeV Compact Cyclotron

cavity, cyclotron, ion, simulation

215

S. Shin, J.-S. Chai, J.C. Lee
SKKU, Suwon, Republic of Korea
B.N. Lee
KAERI, Daejon, Republic of Korea

Funding: National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (2010-0025953)
A compact cyclotron accelerating H⁻ ion for producing a radioactive isotope FDG (FluoroDeoxyGlucose) for PET (Positron Emission Tomography) has been designed at Sungkyunkwan University. The H⁻ ion which generated from the PIG (Panning Ion Gauge) ion source will be accelerated at the normal conducting RF cavity which uses 83.2 MHz of resonance frequency and extracted at the carbon foil striper at the energy of 9 MeV. This cyclotron has to be small to install local hospital while FDG production needs more than 9 MeV of proton beam energy. Chasing two hare at once, deep valley type of magnet has been selected for high energy and compact cyclotron. Due to the small size of valley space where RF cavities will be installed, lots of difficulties have been introduced. Despite of those difficulties at the designing process, we could achieve resonance frequency of 83.2 MHz and Q-factor of 4500 with very compact size of RF cavity.

TUPPT030

Development of 1.5 kW RF Driver for Compact Cyclotron

cathode, vacuum, rf-amplifier, cyclotron

218

H.S. Song, J.-S. Chai, T.V. Cong, S.Y. Jung, H.S. Kim, S.H. Lee, Y.S. Lee, S. Shin, Y.H. Yeon
SKKU, Suwon, Republic of Korea
J.H. Kim
KIRAMS, Seoul, Republic of Korea

1.5 kW RF driver is being designed and manufactured with the resonance frequency of 83.2 MHz. Triode (3CX1500A7) is used for RF power amplification, and ground grid amplifier (G.G. Amp.) type was adopted for this RF driver since the circuit design and realization is simple. Anode, and cathode voltage of RF driver is approximately 3500V, and 5V respectively. In this paper, impedance matching process of RF driver is described. Variable capacitor and variable inductor is utilized to implement the impedance matching for cathode and anode. In addition, RF power output characteristics compared with RF input is shown.

WE1PB03

COLUMBUS - A Small Cyclotron for School and Teaching Purposes

cyclotron, vacuum, ion, ion-source

296

C.R. Wolf
FZJ, Jülich, Germany
M. J. Frank, E. Held
Ernes, Coburg, Germany

A small cyclotron has been constructed for school- and teaching purposes. The cyclotron uses a water-cooled magnet with adjustable pole-pieces. The magnet provides a field up to 0,7 T. Between the two poles the vacuum chamber is positioned. The vacuum chamber provides ports for the different subsystems, measuring tools and some viewports. A turbo molecular pump backed up by a dry compressor vacuum pump is used to evacuate the chamber to a pressure of 10^-5 mbar. The ions will be accelerated between two brass RF electrodes, called dee and dummy-dee. In the center of the chamber there is a thermionic ion source. A massflow controller fills it with hydrogen gas ionized by electrons from a cathode. The required 5,63 MHz RF power is supplied by a RF transceiver. A matchingbox adjusts the output impedance of the transceiver to the input impedance of the cyclotron. The expected final energies of the protons are 24 keV after 12 revolutions. At these energies there is no radiation outside the chamber. In addition to the design of this cyclotron it is the purpose of this dissertation to use standard devices to realize a low-cost solution.

Slides WE1PB03 [6.246 MB]