Author: Wang, L.
Paper Title Page
TUPEA028 Echo-enabled Harmonic Generation based on Hefei Storage Ring 1208
 
  • H.T. Li, W.W. Gao, Q.K. Jia, L. Wang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Echo-En­abled Har­monic Gen­er­a­tion (EEHG) has been pro­posed and ex­per­i­mently demon­strated re­cently. In this paper, we nu­mer­i­cally in­ves­ti­gate the pos­si­bil­ity of op­er­at­ing EEHG based on Hefei stor­age ring, which has a short cir­cum­fer­ence and a small mo­men­tum com­paction fac­tor. The dif­fer­ence to other sim­i­lar re­serch is that we use the whole ring as the first dis­per­sive sec­tion and an op­ti­cal kly­stron as the sec­ond one.  
 
TUPWA024 The Beam Gass Coulomb Scattering in Electron Storage Ring 1778
 
  • X.L. Yu, Z. Bai, W.W. Gao, W. Li, L. Wang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Among the var­i­ous fac­tors which de­ter­mine the beam life time of the HLSII elec­tron stor­age ring, the beam loss due to the scat­ter­ing on resid­ual gas is sim­u­lated using MC method. The paper will give the process of elas­tic and in­elas­tic scat­ter­ing, and the prob­a­bil­ity of each scat­ter­ing is cal­cu­lated, then using MC sam­pling to de­cide which par­ti­cles will par­tic­i­pate in the col­li­sion. Track­ing the beam with scat­ter­ing of beam-gas in­cluded, the spa­tial dis­tri­b­u­tion of beam will be ob­tained. Fi­nally we will give the in­flu­ence analy­sis of beam-gas scat­ter­ing.  
 
TUPWA030 Impedances Calculations of Bellows in HLS II Storage Ring 1784
 
  • Q. Zhang, W. Li, L. Wang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  The up­grade pro­ject of Hefei Lighe Source stor­age ring is car­ry­ing on.​In this pro­ject,a new Bel­lows, in which shield­ing is pro­vided by sprung fin­gers which can slide along the beam screen,is in­stalled at the ac­cel­er­a­tor in­ter­ac­tion area In order to re­duce this im­ped­ance to an ac­cept­able value. The con­tri­bu­tions of Bel­lows to short range wake­fields and broad­band im­ped­ance were cal­cu­lated nu­mer­i­cally by Mafia code .  
 
WEPEA025 Chromatic Sextupole Pair Optimization Methods for Enlarging Dynamic Aperture 2555
 
  • Z. Bai, Q.K. Jia, W. Li, L. Wang, Q. Zhang
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Based on the step-by-step chro­matic­ity com­pen­sa­tion method [1] and ar­ti­fi­cial in­tel­li­gence al­go­rithms, we pro­pose new nu­mer­i­cal meth­ods, called chro­matic sex­tu­pole pair op­ti­miza­tion meth­ods, for en­larg­ing the dy­namic aper­ture of elec­tron stor­age rings. In the new meth­ods, the de­ci­sion vari­ables re­lated to chro­matic sex­tu­pole pairs are op­ti­mized using ar­ti­fi­cial in­tel­li­gence al­go­rithms to en­large the dy­namic aper­ture. We demon­strate that the new meth­ods are equiv­a­lent to the re­cently used nu­mer­i­cal method, in which the de­ci­sion vari­ables, sex­tu­pole strengths, are op­ti­mized using ar­ti­fi­cial in­tel­li­gence al­go­rithms.
[1] E. Levichev, P. Piminov, Proceedings of EPAC 2006, p. 2116. 		 
 
WEPEA027 Nonlinear Model Calibration in Electron Storage Rings via Frequency Analysis 2558
 
  • G. Liu, W. Li, L. Wang, K. Xuan
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Fre­quency analy­sis of turn-by-turn BPM data is a very use­ful nu­mer­i­cal method for analysing the detri­men­tal ef­fect of the non­lin­ear res­o­nances in stor­age rings, and which has been widely used for non­lin­ear res­o­nances mea­sure­ment and cor­rec­tion. We ap­plied this method in this paper for cal­i­brat­ing the non­lin­ear model by nu­mer­i­cal fit­ting of the sex­tu­pole com­po­nents with the ef­fect of ra­di­a­tion damp­ing and de­co­her­ence of the be­ta­tron os­cil­la­tion in HLSII stor­age ring.