A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z  

Yao, C.

Paper Title Page
MOPE083 Comparative Measurements of Libera Brilliance and BSP100 1176
 
  • S. Xu, H. Bui, G. Decker, R. Laird, F. Lenkszus, H. Shang, C. Yao
    ANL, Argonne
  
 

The Ad­vanced Pho­ton Source (APS) is a third-gen­er­a­tion syn­chrotron light source in the Unit­ed States. The BPM elec­tron­ics plays an im­por­tant part in the beam sta­bil­i­ty con­trol. This paper pre­sents com­par­a­tive mea­sure­ments of two BPM elec­tron­ics: Lib­era Bril­liance and APS FP­GA-based BSP100. Some im­por­tant pa­ram­e­ters such as beam cur­rent de­pen­dence, elec­tron­ics res­o­lu­tion and fill pat­tern de­pen­dence have been mea­sured. These mea­sure­ments were car­ried out in the lab and in the real sys­tem. The re­sults will be use­ful for de­cid­ing which BPM elec­tron­ics to de­ploy in the APS up­grade pro­ject.

  
WEPEB048 Fault Diagnosis of the APS Real-time Orbit Feedback System Based on FTA* 2800
 
  • S. Xu, R. Laird, F. Lenkszus, H. Shang, C. Yao
    ANL, Argonne
  
 

The Ad­vanced Pho­ton Source (APS) re­al-time orbit feed­back sys­tem is com­plex and faults are dif­fi­cult to di­ag­nose. This paper pre­sents a di­ag­nos­tic method based on fault tree anal­y­sis (FTA). The fault tree is cre­at­ed based on more than ten years op­er­at­ing ex­pe­ri­ence of the sys­tem. The method is de­scribed to an­a­lyze the fault tree. The op­er­a­tor in­ter­face to the di­ag­nos­tic tool is dis­cussed.

  
WEPEB049 Recent Progress of the Bunch-by-bunch Feedback System at the Advanced Photon Source 2803
 
  • C. Yao, N.P. Di Monte, V. Sajaev
    ANL, Argonne
  
 

A bunch-by-bunch feed­back sys­tem was in­stalled at the APS in 2008. Close-loop tests were con­duct­ed and im­prove­ments have been made to the sys­tem that in­clude two 500-watt am­pli­fiers, a new lo­ca­tion for the hor­i­zon­tal drive stripline, a two-blade new hor­i­zon­tal stripline, and up­grade of front-end elec­tron­ics. With these im­prove­ments we are able to sta­bi­lize beam with a re­duced chro­matic­i­ty of 0.45 in the hor­i­zon­tal plane and 2.5 in the ver­ti­cal plane for the 24-sin­glet bunch pat­tern. Beam life­time has in­creased from 8.5 hours to 15 hours. We did not ob­serve any ob­vi­ous in­crease in the ef­fec­tive beam emit­tance and rms beam mo­tion. More stud­ies will be per­formed to ex­plore the po­ten­tial of im­prov­ing beam per­for­mance of the hy­brids fill pat­tern, which has a 16-mA lead­ing bunch. We re­port the sys­tem im­prove­ments and the re­sults of our test re­sults.


cyao@aps.anl.gov