Author: Schiwietz, G.
Paper Title Page
MOPAB296 Statistical Analysis of 2D Single-Shot PPRE Bunch Measurements 939
 
  • M. Koopmans, J.-G. Hwang, A. Jankowiak, M. Ries, A. Schälicke, G. Schiwietz
    HZB, Berlin, Germany
 
  The pulse pick­ing by res­o­nant ex­ci­ta­tion (PPRE) method* is used to re­al­ize pseudo sin­gle-bunch ra­di­a­tion from a com­plex fill­ing pat­tern at the BESSY II stor­age ring. The PPRE bunch is ex­cited in the hor­i­zon­tal plane by a quasi-res­o­nant in­co­her­ent per­tur­ba­tion to in­crease the emit­tance of this bunch**. There­fore, the syn­chro­tron light of the PPRE bunch can be sep­a­rated by col­li­ma­tion from the ra­di­a­tion of the main bunch train at ded­i­cated beam­lines for tim­ing users. The prop­er­ties of the PPRE bunch de­pend on the stor­age ring set­tings and on the ex­ci­ta­tion pa­ra­me­ters. It is not triv­ial to dis­tin­guish be­tween the wanted in­trin­sic bunch broad­en­ing and an ad­di­tional po­si­tion fluc­tu­a­tion of the PPRE bunch. Using the po­ten­tial of the new di­ag­nos­tics beam­line with the pos­si­bil­ity to ob­serve an ad­di­tional spa­tial di­men­sion with a fast streak cam­era, we in­tro­duce a new method to study the prop­er­ties of the PPRE bunch***. Ap­ply­ing a sta­tis­ti­cal analy­sis to a se­ries of sin­gle-turn im­ages en­ables dis­tin­guish­ing be­tween hor­i­zon­tal orbit mo­tion and the broad­en­ing of the bunch due to the ex­ci­ta­tion. Mea­sure­ments are pre­sented and the re­sults are com­pared with data from the BPM sys­tem.
* K. Holldack et al., Nature Commun. 5 (2014) 4010.
** J.-G. Hwang et al., Nucl. Instrum. Methods A940 (2019) 387.
*** G. Schiwietz et al., Nucl. Instrum. Methods A990 (2021) 164992.
 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB296  
About • paper received ※ 19 May 2021       paper accepted ※ 02 June 2021       issue date ※ 23 August 2021  
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