IPAC2012 - List of Authors (Chang, M.H.)

Paper	Title	Page
WEPPD075	A Novel Planar Balun Structure for Continuous Wave 1 kW, 500 MHz Solid-state Amplifier Design	2699
	T.-C. Yu, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Y.-H. Lin, C.H. Lo, M.H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh NSRRC, Hsinchu, Taiwan
	In general, the coaxial type balun plays key role in push-pull amplifier design in the increasing high power solid-state technique transmitter design for accelerator application. However, the coaxial baluns not only increase the complexity in manufacturing procedure but also introduce additional tolerance variation between modules. The variation between parallel power modules would decreases combining efficiency and thus increase the operation cost. Here, a novel planar balun has been proposed and successfully implemented on 1kW solid-state amplifier design for continuous operation with newly designed water cooling plates. The long-term CW test has demonstrated the feasibility of the newly designed planar is quite suitable for CW operation with its excellent low loss, balance property and also low tolerance between modules in mass production.

THPPC062	CPI 100kW Klystrons Operation Experiences in NSRRC	3434
	T.-C. Yu, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Y.-H. Lin, C.H. Lo, M.H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh NSRRC, Hsinchu, Taiwan
	In 2004, NSRRC had decided to upgrade its traditional copper cavity in storage ring of Taiwan Light Source (TLS) to superconducting cavity for higher beam current, brighter X-ray and more insertion devices. To achieve this, the RF power source-the klystron had been upgraded by intensive cooperation with CPI (Communication & Power Industries) from 70 kW to 100 kW. The same 100 kW klystron would then be also adopted as the RF source in booster in TPS plan. There are total five 100kW CPI klystrons with Model number of VKB-7953B as the power amplifiers in RF facility of NSRRC. Four of the five klystrons have been tested in detail as basic characteristic understanding in custom test stand. Some encountered phenomenon in testing period would be discussed here. In conclusion, these klystrons from CPI is quite load VSWR sensitive while the performance has large difference between them.

THPPC063	Commission of RF Power Sources and its Auxiliary Components for TPS in NSRRC	3437
	T.-C. Yu, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Y.-H. Lin, C.H. Lo, M.H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh NSRRC, Hsinchu, Taiwan
	Since 2010, before the starting the construction of TPS building in NSRRC, the intensive testing activities for RF facility has begun in RF lab. The RF facility includes 300kW transmitters, 350kW ferrite loads and 350kW circulators with the corresponding LLRF prototype system. Some unexpected situation happened, such as HV weak transformers and loosen greased ferrite tiles during the commission of the 300kW transmitter. Those situation are all encountered during long-term reliability test. For a high availability of beam light in TPS, the highly reliable sub-systems are the basic requirement and hence, long-term reliability is so essential during commission period. Then, the high power circulators for safe RF operation are also tested for various phases change at cavity port. The temperature compensation unit plays key role in proper operation of circulator. Some noticeable test procedure and results would also be introduced as the present RF system progress of TPS plan in NSRRC.

THPPR028	Telephone Alarm Broadcasting for TPS RF System	4026
	Y.-H. Lin, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Ch. Wang, M.-S. Yeh, T.-C. Yu NSRRC, Hsinchu, Taiwan
	The Taiwan Photon Source (TPS) consists of three 500-MHz RF systems: two sets RF systems with KEKB-type single-cell SRF modules are used for the 3-GeV storage ring, and one with five-cell Petra cavities at room temperature is used for booster synchrotron. To monitor the status of the RF systems and to broadcast the error/alarm messages to the RF guys, we develop a telephone alarm broadcasting system. This introduces the hardware and software structure of the alarm broadcasting system.

Paper

Title

Page

A Novel Planar Balun Structure for Continuous Wave 1 kW, 500 MHz Solid-state Amplifier Design

2699

T.-C. Yu, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Y.-H. Lin, C.H. Lo, M.H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh
NSRRC, Hsinchu, Taiwan

In general, the coaxial type balun plays key role in push-pull amplifier design in the increasing high power solid-state technique transmitter design for accelerator application. However, the coaxial baluns not only increase the complexity in manufacturing procedure but also introduce additional tolerance variation between modules. The variation between parallel power modules would decreases combining efficiency and thus increase the operation cost. Here, a novel planar balun has been proposed and successfully implemented on 1kW solid-state amplifier design for continuous operation with newly designed water cooling plates. The long-term CW test has demonstrated the feasibility of the newly designed planar is quite suitable for CW operation with its excellent low loss, balance property and also low tolerance between modules in mass production.

THPPC062

CPI 100kW Klystrons Operation Experiences in NSRRC

3434

T.-C. Yu, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Y.-H. Lin, C.H. Lo, M.H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh
NSRRC, Hsinchu, Taiwan

In 2004, NSRRC had decided to upgrade its traditional copper cavity in storage ring of Taiwan Light Source (TLS) to superconducting cavity for higher beam current, brighter X-ray and more insertion devices. To achieve this, the RF power source-the klystron had been upgraded by intensive cooperation with CPI (Communication & Power Industries) from 70 kW to 100 kW. The same 100 kW klystron would then be also adopted as the RF source in booster in TPS plan. There are total five 100kW CPI klystrons with Model number of VKB-7953B as the power amplifiers in RF facility of NSRRC. Four of the five klystrons have been tested in detail as basic characteristic understanding in custom test stand. Some encountered phenomenon in testing period would be discussed here. In conclusion, these klystrons from CPI is quite load VSWR sensitive while the performance has large difference between them.

THPPC063

Commission of RF Power Sources and its Auxiliary Components for TPS in NSRRC

3437

T.-C. Yu, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Y.-H. Lin, C.H. Lo, M.H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh
NSRRC, Hsinchu, Taiwan

Since 2010, before the starting the construction of TPS building in NSRRC, the intensive testing activities for RF facility has begun in RF lab. The RF facility includes 300kW transmitters, 350kW ferrite loads and 350kW circulators with the corresponding LLRF prototype system. Some unexpected situation happened, such as HV weak transformers and loosen greased ferrite tiles during the commission of the 300kW transmitter. Those situation are all encountered during long-term reliability test. For a high availability of beam light in TPS, the highly reliable sub-systems are the basic requirement and hence, long-term reliability is so essential during commission period. Then, the high power circulators for safe RF operation are also tested for various phases change at cavity port. The temperature compensation unit plays key role in proper operation of circulator. Some noticeable test procedure and results would also be introduced as the present RF system progress of TPS plan in NSRRC.

THPPR028

Telephone Alarm Broadcasting for TPS RF System

4026

Y.-H. Lin, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Ch. Wang, M.-S. Yeh, T.-C. Yu
NSRRC, Hsinchu, Taiwan

The Taiwan Photon Source (TPS) consists of three 500-MHz RF systems: two sets RF systems with KEKB-type single-cell SRF modules are used for the 3-GeV storage ring, and one with five-cell Petra cavities at room temperature is used for booster synchrotron. To monitor the status of the RF systems and to broadcast the error/alarm messages to the RF guys, we develop a telephone alarm broadcasting system. This introduces the hardware and software structure of the alarm broadcasting system.