Author: Sugimoto, H.
Paper Title Page
TUPAB009 SuperKEKB Optics Measurements Using Turn-by-Turn Beam Position Data 1352
 
  • J. Keintzel, R. Tomás García
    CERN, Geneva, Switzerland
  • H. Koiso, G. Mitsuka, A. Morita, K. Ohmi, Y. Ohnishi, H. Sugimoto, M. Tobiyama, R.J. Yang
    KEK, Ibaraki, Japan
  
  Su­perKEKB, an asym­met­ric elec­tron-positron col­lider, has re­cently achieved the world record in­stan­ta­neous lu­mi­nos­ity of 2.8 × 1034 \si{cm-2s-1} using crab-waist col­li­sion scheme. In order to reach the de­sign value of 6×1035 \si{cm-2s-1} a ver­ti­cal beta func­tion at the in­ter­ac­tion point of §I{0.3}{mm} is re­quired, de­mand­ing un­prece­dented op­tics con­trol. Turn-by-turn beam po­si­tion data could en­able fast op­tics mea­sure­ments for rapid iden­ti­fi­ca­tion of un­ex­pected error sources. Ex­per­i­ments ex­plor­ing var­i­ous data ac­qui­si­tion tech­niques at dif­fer­ent squeez­ing steps dur­ing com­mis­sion­ing are pre­sented and com­pared to re­sults ob­tained from closed orbit dis­tor­tion.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB009  
About • paper received ※ 18 May 2021       paper accepted ※ 10 June 2021       issue date ※ 24 August 2021  
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TUPAB010 Impact of Bunch Current on Optics Measurements in SuperKEKB 1356
 
  • J. Keintzel, R. Tomás García, F. Zimmermann
    CERN, Geneva, Switzerland
  • T. Ishibashi, H. Koiso, G. Mitsuka, A. Morita, K. Ohmi, Y. Ohnishi, H. Sugimoto, S. Terui, M. Tobiyama, R.J. Yang, D. Zhou
    KEK, Ibaraki, Japan
  
  Su­perKEKB has re­cently achieved the world record in­stan­ta­neous lu­mi­nos­ity of 2.8 × 1034 \si{cm-2s-1} and aims at reach­ing a tar­get lu­mi­nos­ity of about 6 × 1035 \si{cm-2s-1}. To ac­com­plish this goal it is planned to in­crease beam cur­rents up to §I{3.6}{A} and §I{2.6}{A} for the positron and the elec­tron ring, re­spec­tively. In­creas­ing the beam cur­rents and, in par­tic­u­lar, the num­ber of lep­tons per bunch, can im­pact the op­tics pa­ra­me­ters ob­tained by turn-by-turn mea­sure­ments, such as the be­ta­tron tune or phase ad­vance. Op­tics mea­sure­ments per­formed at var­i­ous bunch cur­rents can give first in­di­ca­tions of pos­si­ble in­ten­sity de­pen­dent ef­fects. In this paper, the ef­fect of vary­ing bunch cur­rent on op­tics mea­sure­ments at Su­perKEKB is ex­plored.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB010  
About • paper received ※ 18 May 2021       paper accepted ※ 10 June 2021       issue date ※ 30 August 2021  
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