Cyclotrons2013 - List of Authors (Cong, T.V.)

Paper	Title	Page
TUPPT019	Development Study of Penning Ion Source for Compact 9 MeV Cyclotron	195
	Y.H. Yeon, J.-S. Chai, T.V. Cong, Kh.M. Gad, M. Ghergherehchi, S.Y. Jung, H.S. Kim, H.W. Kim, S.H. Kim, S.H. Lee, Y.S. Lee, X.J. Mu, S.Y. Oh, S. Shin SKKU, Suwon, Republic of Korea
	Funding: This research was supported by WCU (World Class University) program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (R31-2008-10029). Penning Ion Gauge(PIG) have been used in internal source for cyclotron. PIG source for internal source of 9 MeV cyclotron produces H⁻ ion. This source consists of cold cathode which discharges electrons for producing H⁻ ion and anode for making plasma wall. Cold cathode material tantalum was used for emitting electrons and tungsten copper alloy was used for anode. The size of PIG source is related to size of cyclotron magnet. Optimization of cathode and anode location and sizing were needed for simplifying this source for reducing the size of compact cyclotron. Transportation of electrons and number of secondary electrons has been calculated by CST particle studio. Motion of H2 gas has been calculated by ANSYS. Calculation of PIG source in 9 MeV cyclotron has been performed by using various chimneys with different size of expansion gap between the plasma boundary and the chimney wall. In this paper design process and experiment result is reported.

TUPPT028	Development of 20 kW RF Amplifier for Compact Cyclotron	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.

TUPPT030	Development of 1.5 kW RF Driver for Compact 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.

Paper

Title

Page

Development Study of Penning Ion Source for Compact 9 MeV Cyclotron

195

Y.H. Yeon, J.-S. Chai, T.V. Cong, Kh.M. Gad, M. Ghergherehchi, S.Y. Jung, H.S. Kim, H.W. Kim, S.H. Kim, S.H. Lee, Y.S. Lee, X.J. Mu, S.Y. Oh, S. Shin
SKKU, Suwon, Republic of Korea

Funding: This research was supported by WCU (World Class University) program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (R31-2008-10029).
Penning Ion Gauge(PIG) have been used in internal source for cyclotron. PIG source for internal source of 9 MeV cyclotron produces H⁻ ion. This source consists of cold cathode which discharges electrons for producing H⁻ ion and anode for making plasma wall. Cold cathode material tantalum was used for emitting electrons and tungsten copper alloy was used for anode. The size of PIG source is related to size of cyclotron magnet. Optimization of cathode and anode location and sizing were needed for simplifying this source for reducing the size of compact cyclotron. Transportation of electrons and number of secondary electrons has been calculated by CST particle studio. Motion of H2 gas has been calculated by ANSYS. Calculation of PIG source in 9 MeV cyclotron has been performed by using various chimneys with different size of expansion gap between the plasma boundary and the chimney wall. In this paper design process and experiment result is reported.

TUPPT028

Development of 20 kW RF Amplifier for Compact Cyclotron

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.

TUPPT030

Development of 1.5 kW RF Driver for Compact 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.