Author: Oide, K.
Paper Title Page
TUPPC017 Orbit and Optics Correction to Realize Designed Machine Performance 1194
  • Y. Seimiya, S. Kamada, A. Morita, K. Ohmi, K. Oide
    KEK, Ibaraki, Japan
  It is difficult for actual accelerators to achieve the designed machine performance without appropriate correction or adjustment of magnet errors. By correction as magnets are aligned to design orbit, we aim to be realized the designed machine performance. However, it is not easy to estimate the design orbit in real accelerators. In KEKB and PF, beam position monitor(BPM) can be calibrated to the center of quadrupole magnet(QM). BPM and QM misalignments (except rotation misalignment) referring to design orbit can be estimated using assumption that these misalignments are coincident. This is, design orbit at BPM and QM can be derived.  
TUPPC018 Estimation of Orbit and Optics Distortion of SuperKEKB by Tunnel Deformation 1197
  • A. Morita, H. Koiso, Y. Ohnishi, K. Oide, H. Sugimoto
    KEK, Ibaraki, Japan
  The tunnel which was used for the KEKB B-factory is reused for the accelerator tunnel of the SuperKEKB. The total vertical displacement of the tunnel subsidence reached almost 30mm during 10 years KEKB operation. In order to operate the SuperKEKB which might be more delicate machine than the previous KEKB B-factory, we are evaluating the optics distortion by the tunnel deformation and studying the machine performance after the orbit and optics correction. We report the estimation of the machine performance degradation by the tunnel subsidence and the requirement of the correction.  
TUPPC020 A Scheme for Horizontal-vertical Coupling Correction at SuperKEKB 1203
  • H. Sugimoto, H. Koiso, A. Morita, Y. Ohnishi, K. Oide
    KEK, Ibaraki, Japan
  SuperKEKB is an 7 GeV electron and 4 GeV positron double ring collider project based on the nano beam scheme and is aimed to break the world's luminosity record. A horizontal flat beam is essential to realize the nano beam collisions. One of critical effect that induces unexpected coupling is machine error, such as magnet misalignment and field imperfection. Coupling correction, therefore, plays key role in the actual beam operation. In this study, we numerically explore a possible scheme for coupling correction in the SuperKEKB lattice. Some coupling measurement and correction methods are applied to the model lattice considering magnet misalignments and finite BPM resolution. Based on the results, the attainable smallest coupling in the actual SuperKEKB is discussed.  
TUPPR006 Design Progress and Construction Status of SuperKEKB 1822
  • H. Koiso, K. Akai, K. Oide
    KEK, Ibaraki, Japan
  KEKB operation finished in June 2010, and the upgrade of KEKB to SuperKEKB has commenced. The design luminosity of SuperKEKB is 8×1035cm-2s-1, which is 40 times higher than that of KEKB. The design strategy for SuperKEKB is based on the Nano-Beam Scheme, where the vertical beam sizes of the low-energy positron ring and the high-energy electron ring are squeezed to 50−60 nm at the interaction point with a large Piwinski angle. The beam currents in both rings will be double those in KEKB. Finalizing the design of the interaction region is going on by using precise modeling of beam optics. Dismantling KEKB rings and fabrication of accelerator components for SuperKEKB including magnets, power supplies, and antechamber-type beam pipes have already started. This paper describes design progress and construction status of SuperKEKB.  
THPPD023 Solenoid Field Calculation of the SuperKEKB Interaction Region 3548
  • N. Ohuchi, Y. Arimoto, M. Iwasaki, H. Koiso, A. Morita, Y. Ohnishi, K. Oide, M. Tawada, K. Tsuchiya, H. Yamaoka
    KEK, Ibaraki, Japan
  The SuperKEKB is the electron-positron collider, and the target luminosity is 8×1035 cm-2s−1, which is 40 times larger than the attained luminosity of KEKB. The beam final focus system consists of many types of superconducting magnets as 8 quadrupoles, 40 correctors and 4 compensation solenoids. These focusing magnets and correctors are designed to be operated inside the particle detector, Belle, and under the solenoid field of 1.5 T. From the analysis of beam optics, the solenoid field profile has serious impact on the beam vertical emittance. We designs the solenoid field profile along the Belle axis in a 2-dimensional model as the first step, and now we developed this model to the 3-dimensional calculation in detail. The solenoid field profiles along the both beam lines are generated with the combine solenoid field by the Belle solenoid and the compensation solenoids, and the magnetic components of the magnets and the magnetic shields on the beam lines. The model is very complicate. From the calculation results, we will discuss the influence on the beam optics and the final focusing magnet system.