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Lin, Y.-H.

Paper Title Page
WE5PFP089 Study of Direct RF Feedback with the Pedersen Model 2219
 
  • L.-H. Chang, F.-T. Chung, M.-C. Lin, Y.-H. Lin, C.-K. Liu, C.H. Lo, Ch. Wang, M.-S. Yeh, T.-C. Yu
    NSRRC, Hsinchu
  
 

The direct RF feedback has been adopted in storage ring to reduce the beam loading effect for maximizing the stored beam current. Its performance in reducing beam loading is determined by the operational parameters, including the feedback gain, RF phase shift and the loop delay time. This paper presents a mathematical method, based on the Pedersen model, to study the effects of the direct RF feedback on beam loading. Through an example, the influences of different operational parameters on the performance of the direct RF feedback is analyzed by examining the characteristic equation of the feedback loop. The Nyquist criterion is applied for the determination of system stability.

  
TH6REP004 Development of a Fast Signal-Gating Circuit for Observation of Fast Glitch of Photon Beam Intensity at NSRRC 3956
 
  • F.-T. Chung, H.-P. Chang, Y.K. Lin, Y.-H. Lin, Y.-C. Liu, C.H. Lo, Ch. Wang, M.-S. Yeh
    NSRRC, Hsinchu
  
 

Stability of photon beam intensity, I0, is one of the most important performance merits of a modern light source. The photon intensity measured at dragon beam line (BL11) is routinely used as a reference signal for I0 stability measurements. At NSRRC, a highly stable I0 intensity is maintained in most percentage of the user beam time. Meanwhile, glitches of I0 intensity up to few tens of percentage had been observed once every few operating hours, which was a puzzle before its reason had been identified later. A spontaneous large variation of photon intensity (I/I0) caused difficulties for users operating their experiments. Here, we report our development of a dedicated electronic circuit with functionality of single-gate, which was very helpful to clarify the puzzle of I0 glitches observed at NSRRC.

  
FR5REP032 Diagnostic Systems for the TLS SRF System 4838
 
  • Y.-H. Lin, L.-H. Chang, F.-T. Chung, M.-C. Lin, C.H. Lo, Ch. Wang, M.-S. Yeh
    NSRRC, Hsinchu
  
 

To improve the reliability of a contemporary synchrotron as light source, a diagnostic system is crucial. A satisfactory diagnostic system must enable a clear presentation of the reason for a system fault, and provide sufficient information to the data analyzer for system recovery and improvement. To identify a fault and to monitor the operation of a RF system, many diagnostic utilities have been adopted. The architecture for the diagnostics of the TLS RF system is here reported.