Author: Zou, J.Y.
Paper Title Page
MOPME039 A New Method of Acquiring Fast Beam Transversal Profile in the Storage Ring 556
 
  • C. Cheng, P. Lu, B.G. Sun, K. Tang, F.F. Wu, Y.Y. Xiao, Y.L. Yang, Z.R. Zhou, J.Y. Zou
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  A new method of ac­quir­ing fast beam trans­verse pro­file has been de­vel­oped and will be used in HLS II. This method is based on four sig­nals from MAPMT (multi-an­ode photo-mul­ti­plier tube) and log­a­rithm pro­cess­ing tech­nique. First, the cal­cu­la­tion for­mula of beam trans­ver­sal size and po­si­tion are de­duced using above method. Then, the main per­for­mances (e.g. sen­si­tiv­ity and lin­ear­ity range) are an­a­lyzed. Ac­cord­ing to stim­u­la­tion re­sult, re­gard­less of cross-talk and in­con­sis­tency be­tween chan­nels, the size sig­nal has a lin­ear re­la­tion with size s when s=0.8-2mm and po­si­tion d=±2mm, the po­si­tion sig­nal has a lin­ear re­la­tion with po­si­tion d and the lin­ear range ex­ceeds ±2mm when s=0.8-2mm. With chan­nel cross-talk and chan­nel in­con­sis­tency being con­sid­ered, the stim­u­la­tion re­sults also are given. Fi­nally, a fast beam trans­verse pro­file mon­i­tor is de­signed and pro­vides turn-by-turn mea­sure­ment of the beam trans­verse pro­file.  
 
MOPME042 A PRELIMINARY SIMULATION OF BPM SIGNAL DIODE DETECTOR FOR HLS II TUNE MEASUREMENT SYSTEM* 565
 
  • J.J. Zheng, P. Lu, T.J. Ma, B.G. Sun, Y.L. Yang, J.Y. Zou
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Funding: Supported by National Natural Science Foundation of China (11105141, 11175173) and the Fundamental Research Funds for the Central Universities (WK2310000015)
A high sen­si­tiv­ity BPM sig­nal de­tec­tion front-end elec­tron­ics has been de­signed for HLS II tune mea­sure­ment sys­tem ac­cord­ing to the HLS II up­grade re­quire­ments. Clas­si­cal tune mea­sure­ment sys­tems fil­ter out just one or a few of these be­ta­tron side­bands fre­quency. As a con­se­quence, most of the be­ta­tron en­ergy is dropped and only a very small en­ergy re­mains for fur­ther pro­cess­ing. A new method, re­ferred to as Di­rect Diode De­tec­tion (3D) by LHC[1], im­proves the sit­u­a­tion. In this paper, the HLS II BPM sig­nals have been cal­cu­lated out in time do­main and fre­quency do­main. Bas­ing on the char­ac­ter­is­tics of HLS II BPM sig­nal, a pre­lim­i­nary sim­u­la­tion is per­formed to test and ver­ify the fea­si­bil­ity of diode de­tec­tor for HLS II tune mea­sure­ment sys­tem. The sim­u­la­tion re­sults clearly show that the tech­nique of diode-based cir­cuit can be ap­plied to HLS II tune mea­sure­ment. 		 
 
MOPME043 Calibration of Beam Position Monitors in the Injector of HLS II 568
 
  • J.Y. Zou, J. Fang, W.B. Li, P. Lu, T.J. Ma, B.G. Sun, Y.L. Yang, Z.R. Zhou
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Funding: Supported by the National Science Foundation of China (11175173, 11105141)
A beam po­si­tion mon­i­tor(BPM) sys­tem is being in­stalled to im­prove the beam po­si­tion mea­sure­ment of the in­jec­tor at the up­grade pro­ject of Hefei Light Source (HLS II). The new BPM sys­tem is con­sists of 19 stripline BPMs and 19 Lib­era Bril­liance Sin­gle Pass mod­ules. Be­fore in­stal­la­tion, the re­sponse of the BPMs must be mapped to im­prove the ac­cu­racy of mea­sure­ment. The the­o­ret­i­cal equa­tions of both po­si­tion and quadru­pole com­po­nent of the BPM are cal­cu­lated first, using both for­mula and mat­lab sim­u­la­tion. A lab­o­ra­tory cal­i­bra­tion sys­tem is built. The in­con­sis­tency of Lib­era Bril­liance Sin­gle Pass chan­nels is mea­sured to im­prove the ac­cu­racy of cal­i­bra­tion. The cal­i­brat­ing re­sults show the po­si­tion sen­si­tiv­ity is less than 5% dif­fer­ence com­pare to the the­o­ret­i­cal value, while the quadru­pole com­po­nent sen­si­tiv­ity is less than 10% dif­fer­ence.