IPAC2012 - List of Authors (Chen, J.)

Paper	Title	Page
MOPPP077	Heat Load Budget on TPS Undulator in Vacuum	741
	J.C. Huang, J. Chen, C.-S. Hwang, F.-Y. Lin, Y.T. Yu NSRRC, Hsinchu, Taiwan
	The performance of an insertion device is limited by the magnet gap because a small gap affects the dynamic aperture and results in a short life time of the beam. An in-vacuum undulator is designed to have no vacuum chamber between the magnet arrays so to allow the entire magnet gap to be fully used for the dynamic aperture. An in-vacuum undulator can optimally minimize the gap to achieve continuous energy spectra. One problem of an undulator with a small gap is resistive wall heating by the image current. The heat load depends strongly on the injected mode in the storage ring; injection of multiple bunches might deteriorate the thermal performance for the magnet array. In this paper, we present a calculation of the heat load budget for a magnet array of an in-vacuum undulator of Taiwan Photon Source (TPS).

MOPPR051	TLS Transportline BPM Upgrade	897
	P.C. Chiu, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, C.H. Kuo, C.Y. Liao, C.Y. Wu NSRRC, Hsinchu, Taiwan
	There are seven stripline beam position monitor (BPM) installed in TLS booster to storage ring transport line. In order to provide the BPM system with better performance and functionalities, the latest generation BPM electronics Libera SinglePass had been adopted in TLS transport line for these stripline BPM. One unit had been tested in early 2011 and delivered the reliable and satisfactory results therefore extra six units had been purchased later. Currently, all of the new 7 units have replaced the past BPM electronics. The application had also been continuously developed. On the other hand, it is expected that the upgrade could enhance diagnostic functionalities for the related injection study. In this report, the injection stability and efficiency had been investigated.

WEPPD046	Design of Machine Protection System for the Taiwan Photon Source	2618
	C.Y. Liao, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, C.H. Kuo, D. Lee, C.Y. Wu NSRRC, Hsinchu, Taiwan
	The Taiwan Photon Source (TPS) is being constructed at the campus of the NSRRC (National Synchrotron Radiation Research Center). In order to prevent damage to accelerator components induced by various events, design of the global machine protection system (MPS) is on-going. The MPS collect interlock and beam dump request from various system, perform decision, transmit dump beam request to RF system. The PLC based system will be used as a slow MPS which can delivery less than 8 msec reaction time. The fast MPS will dependent on event based timing system to deliver response time less than 5 μsec. Trigger signal for post-mortem will also be distributed by the fast MPS. To ensure alive of the system, several self-diagnostics mechanisms include heartbeat and transient capture will be implemented. The MPS architecture, plans and implementation were presented in this report.

WEPPD047	Sequencer Design of Timing System for the Taiwan Photon Source	2621
	C.Y. Wu, Y.-T. Chang, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, C.Y. Liao NSRRC, Hsinchu, Taiwan
	The timing system of the Taiwan Photon Source is used to distribute trigger signals and synchronously clocks to all the equipment of the machine which need them. The timing system basically works by sending event codes from one event generator (EVG) through tree structured, bidirectional optical fiber network to many event receivers. To accommodate various operation and injection scenarios of the TPS storage ring and booster synchrotron and LINAC, timing sequencer design and control is crucial. The sequencer (event code) is stored at sequence RAM of the EVG module. In order to manage sequence RAM of EVG, the timing sequence control is considered to use Matlab scripts embedded in the timing master EPICS IOC. The timing sequencer design will be summarized in this paper.

THPPR010	Integrate EPICS System with the TLS Control System	3984
	Y.-S. Cheng, Y.-T. Chang, J. Chen, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, C.Y. Liao, C.Y. Wu NSRRC, Hsinchu, Taiwan
	The TLS (Taiwan Light Source) is a third generation of synchrotron light source, and it has been operated since 1993. The TLS control system was developed and implemented by ourselves. The control system of our new project (TPS, Taiwan Photon Source) is developed and based upon the EPICS framework. To earn more experiences on the EPICS usage, some of the TLS newly installed subsystem run EPICS directly. For example, BPM system, bunch-by-bunch feedback system, remote oscilloscope waveform access and so on adapt the EPICS interface to control and monitor. The EDM and Matlab (with LabCA) toolkits are used as EPICS graphical user interface, and it is also operated at the TLS control consoles environment normally. The archive system transaction between the TLS control system format and EPICS PVs (Process Variables) has been implemented for user access with the existing archive viewer. The efforts will be described at this report.

THPPR011	Insertion Device Controls Plan of the Taiwan Photon Source	3987
	C.Y. Wu, J. Chen, Y.-S. Cheng, K.T. Hsu, S.Y. Hsu, K.H. Hu, C.H. Kuo, D. Lee, C.Y. Liao NSRRC, Hsinchu, Taiwan
	Insertion device (ID) is a crucial component in third-generation synchrotron light sources, which can produces highly-brilliant, forward-directed and quasi-monochromatic radiation over a broad energy range for various experiments. In the phase I of the Taiwan Photon Source (TPS) project, ten insertion devices (IDs) will be planned, constructed, and installed for the first seven beamlines. The control system for all the IDs is based on the EPICS architecture. The main control components include the motor with encoder for gap adjustment, trim coil power supply for corrector magnets, temperature sensor for ID environmental monitoring and baking (only for In-Vacuum Undulator), and interlock system (limit switches, tilt sensor) for safety. The progress of the controls plan will be summarized in this report.

TUPPP018	Design and Commissioning of the Very Low Emittance Optics in the SSRF Storage Ring	1647
	S.Q. Tian, J. Chen, B.C. Jiang, Y.B. Leng, H.H. Li, L.Y. Yu, M.Z. Zhang, W.Z. Zhang, Z.T. Zhao SINAP, Shanghai, People's Republic of China
	In synchrotron radiation light sources, there are continuous efforts to lower the storage ring emittance and thus increase its photon beam brightness. The lowest effective emittance of SSRF is found by a systematic method. Results of design and commissioning of this kind of optics are presented, of which the beam emittance is smaller than the nominal one by 1 nm.rad. The measured beam parameters agree well with the design ones.

THPPR024	Upgrade of Radiation Monitoring System at SSRF for Top-up Operation	4014
	X. Xia, J. Chen, J.J. Lv, W. Shen, T. Wan, W.F. Wu, X.J. Xu, H. Zhao SINAP, Shanghai, People's Republic of China
	The radiation monitoring system (RMS) at Shanghai Synchrotron Radiation Facility, SSRF, is required to upgrade to have dose interlock functions for top-up operation as an important safety issue. This paper describes the basic requirements, design criteria, signal network, and functions of the upgraded radiation monitoring system. Both the prompt dose rate and the accumulative dose alarm were archived for the safety issue after the upgrade. The reliability and stability of the upgraded RMS are in testing for getting operation permission from authority for radiation safety issue.

MOPPR038	Bunch by Bunch Beam Diagnostics in SSRF	861
	Y.B. Leng, J. Chen, Z.C. Chen, Y.B. Yan, N. Zhang SSRF, Shanghai, People's Republic of China B.P. Wang SINAP, Shanghai, People's Republic of China
	A set of broadband beam instruments including filling pattern monitor, scope based BPM processor and streak camera has been implemented in the storage ring of SSRF. Several parameters such as charge, lifetime, transverse position, betatron tune and beam length, can be measured for individual bunch by these devices. The operation experience and measurement results will be introduced. The preliminary effort to retrieve wake field information from these measurements will be presented as well.

Paper

Title

Page

Heat Load Budget on TPS Undulator in Vacuum

741

J.C. Huang, J. Chen, C.-S. Hwang, F.-Y. Lin, Y.T. Yu
NSRRC, Hsinchu, Taiwan

The performance of an insertion device is limited by the magnet gap because a small gap affects the dynamic aperture and results in a short life time of the beam. An in-vacuum undulator is designed to have no vacuum chamber between the magnet arrays so to allow the entire magnet gap to be fully used for the dynamic aperture. An in-vacuum undulator can optimally minimize the gap to achieve continuous energy spectra. One problem of an undulator with a small gap is resistive wall heating by the image current. The heat load depends strongly on the injected mode in the storage ring; injection of multiple bunches might deteriorate the thermal performance for the magnet array. In this paper, we present a calculation of the heat load budget for a magnet array of an in-vacuum undulator of Taiwan Photon Source (TPS).

MOPPR051

TLS Transportline BPM Upgrade

897

P.C. Chiu, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, C.H. Kuo, C.Y. Liao, C.Y. Wu
NSRRC, Hsinchu, Taiwan

There are seven stripline beam position monitor (BPM) installed in TLS booster to storage ring transport line. In order to provide the BPM system with better performance and functionalities, the latest generation BPM electronics Libera SinglePass had been adopted in TLS transport line for these stripline BPM. One unit had been tested in early 2011 and delivered the reliable and satisfactory results therefore extra six units had been purchased later. Currently, all of the new 7 units have replaced the past BPM electronics. The application had also been continuously developed. On the other hand, it is expected that the upgrade could enhance diagnostic functionalities for the related injection study. In this report, the injection stability and efficiency had been investigated.

WEPPD046

Design of Machine Protection System for the Taiwan Photon Source

2618

C.Y. Liao, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, C.H. Kuo, D. Lee, C.Y. Wu
NSRRC, Hsinchu, Taiwan

The Taiwan Photon Source (TPS) is being constructed at the campus of the NSRRC (National Synchrotron Radiation Research Center). In order to prevent damage to accelerator components induced by various events, design of the global machine protection system (MPS) is on-going. The MPS collect interlock and beam dump request from various system, perform decision, transmit dump beam request to RF system. The PLC based system will be used as a slow MPS which can delivery less than 8 msec reaction time. The fast MPS will dependent on event based timing system to deliver response time less than 5 μsec. Trigger signal for post-mortem will also be distributed by the fast MPS. To ensure alive of the system, several self-diagnostics mechanisms include heartbeat and transient capture will be implemented. The MPS architecture, plans and implementation were presented in this report.

WEPPD047

Sequencer Design of Timing System for the Taiwan Photon Source

2621

C.Y. Wu, Y.-T. Chang, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, C.Y. Liao
NSRRC, Hsinchu, Taiwan

The timing system of the Taiwan Photon Source is used to distribute trigger signals and synchronously clocks to all the equipment of the machine which need them. The timing system basically works by sending event codes from one event generator (EVG) through tree structured, bidirectional optical fiber network to many event receivers. To accommodate various operation and injection scenarios of the TPS storage ring and booster synchrotron and LINAC, timing sequencer design and control is crucial. The sequencer (event code) is stored at sequence RAM of the EVG module. In order to manage sequence RAM of EVG, the timing sequence control is considered to use Matlab scripts embedded in the timing master EPICS IOC. The timing sequencer design will be summarized in this paper.

THPPR010

Integrate EPICS System with the TLS Control System

3984

Y.-S. Cheng, Y.-T. Chang, J. Chen, P.C. Chiu, K.T. Hsu, K.H. Hu, C.H. Kuo, C.Y. Liao, C.Y. Wu
NSRRC, Hsinchu, Taiwan

The TLS (Taiwan Light Source) is a third generation of synchrotron light source, and it has been operated since 1993. The TLS control system was developed and implemented by ourselves. The control system of our new project (TPS, Taiwan Photon Source) is developed and based upon the EPICS framework. To earn more experiences on the EPICS usage, some of the TLS newly installed subsystem run EPICS directly. For example, BPM system, bunch-by-bunch feedback system, remote oscilloscope waveform access and so on adapt the EPICS interface to control and monitor. The EDM and Matlab (with LabCA) toolkits are used as EPICS graphical user interface, and it is also operated at the TLS control consoles environment normally. The archive system transaction between the TLS control system format and EPICS PVs (Process Variables) has been implemented for user access with the existing archive viewer. The efforts will be described at this report.

THPPR011

Insertion Device Controls Plan of the Taiwan Photon Source

3987

C.Y. Wu, J. Chen, Y.-S. Cheng, K.T. Hsu, S.Y. Hsu, K.H. Hu, C.H. Kuo, D. Lee, C.Y. Liao
NSRRC, Hsinchu, Taiwan

Insertion device (ID) is a crucial component in third-generation synchrotron light sources, which can produces highly-brilliant, forward-directed and quasi-monochromatic radiation over a broad energy range for various experiments. In the phase I of the Taiwan Photon Source (TPS) project, ten insertion devices (IDs) will be planned, constructed, and installed for the first seven beamlines. The control system for all the IDs is based on the EPICS architecture. The main control components include the motor with encoder for gap adjustment, trim coil power supply for corrector magnets, temperature sensor for ID environmental monitoring and baking (only for In-Vacuum Undulator), and interlock system (limit switches, tilt sensor) for safety. The progress of the controls plan will be summarized in this report.

TUPPP018

Design and Commissioning of the Very Low Emittance Optics in the SSRF Storage Ring

1647

S.Q. Tian, J. Chen, B.C. Jiang, Y.B. Leng, H.H. Li, L.Y. Yu, M.Z. Zhang, W.Z. Zhang, Z.T. Zhao
SINAP, Shanghai, People's Republic of China

In synchrotron radiation light sources, there are continuous efforts to lower the storage ring emittance and thus increase its photon beam brightness. The lowest effective emittance of SSRF is found by a systematic method. Results of design and commissioning of this kind of optics are presented, of which the beam emittance is smaller than the nominal one by 1 nm.rad. The measured beam parameters agree well with the design ones.

THPPR024

Upgrade of Radiation Monitoring System at SSRF for Top-up Operation

4014

X. Xia, J. Chen, J.J. Lv, W. Shen, T. Wan, W.F. Wu, X.J. Xu, H. Zhao
SINAP, Shanghai, People's Republic of China

The radiation monitoring system (RMS) at Shanghai Synchrotron Radiation Facility, SSRF, is required to upgrade to have dose interlock functions for top-up operation as an important safety issue. This paper describes the basic requirements, design criteria, signal network, and functions of the upgraded radiation monitoring system. Both the prompt dose rate and the accumulative dose alarm were archived for the safety issue after the upgrade. The reliability and stability of the upgraded RMS are in testing for getting operation permission from authority for radiation safety issue.

MOPPR038

Bunch by Bunch Beam Diagnostics in SSRF

861

Y.B. Leng, J. Chen, Z.C. Chen, Y.B. Yan, N. Zhang
SSRF, Shanghai, People's Republic of China
B.P. Wang
SINAP, Shanghai, People's Republic of China

A set of broadband beam instruments including filling pattern monitor, scope based BPM processor and streak camera has been implemented in the storage ring of SSRF. Several parameters such as charge, lifetime, transverse position, betatron tune and beam length, can be measured for individual bunch by these devices. The operation experience and measurement results will be introduced. The preliminary effort to retrieve wake field information from these measurements will be presented as well.