R&amp;amp;D Status of Vacuum Components for the Upgrade of KEKB

Suetsugu, Y.; Kanazawa, Kenichi; Shibata, K.; Ohuchi, N.; Hisamatsu, Hiromi; Shirai, Mitsuru

doi:10.1109/pac.2005.1591431

Cited by 7 publications

(21 citation statements)

References 3 publications

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“…The design of the beam pipes, of the bellows and of the gate valves for SuperKEKB has been done, and some prototypes were tested at present KEKB. There still remain a few R&D issues in beam collimators and coherent synchrotron radiation [1070][1071][1072][1073][1074][1075].…”

Section: Baseline Design Of Superkekbmentioning

confidence: 99%

B, D and K decays

et al. 2008

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With the advent of the LHC, we will be able to probe New Physics (NP) up to energy scales almost one order of magnitude larger than it has been possible with present accelerator facilities. While direct detection of new particles will be the main avenue to establish the presence of NP at the LHC, indirect searches will provide precious complementary information, since most probably it will not be possible to measure the full spectrum of new particles and their couplings through direct production. In particular, precision measurements and computations in the realm of flavor physics are expected to play a key role in constraining the unknown parameters of the Lagrangian of any NP model emerging from direct searches at the LHC.The aim of Working Group 2 was twofold: on the one hand, to provide a coherent up-to-date picture of the status of flavor physics before the start of the LHC; on the other hand, to initiate activities on the path towards integrating information on NP from high-p T and flavor data.This report is organized as follows: in Sect. 1, we give an overview of NP models, focusing on a few examples that have been discussed in some detail during the workshop, with a short description of the available computational tools for flavor observables in NP models. Section 2 contains a concise discussion of the main theoretical problem in flavor physics: the evaluation of the relevant hadronic matrix elements for weak decays. Section 3 contains a detailed discussion of NP effects in a set of flavor observables that we identified as "benchmark channels" for NP searches. The experimental prospects for flavor physics at future facilities are discussed in Sect. 4. Finally, Sect. 5 contains some assessEur. Phys. J. C (2008) 57: 309-492 311 ments on the work done at the workshop and the prospects for future developments.

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Section: Baseline Design Of Superkekbmentioning

confidence: 99%

B, D and K decays

et al. 2008

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“…The growth rates, ÿ1 [s ÿ1 ], of the longitudinal and transverse CBI were calculated with the formulas presented in Appendix C using the impedances obtained above. Here, the ÿ1 values for the cases of the present KEKB and the Super KEKB, an upgrade plan of KEKB [14,16,28], were evaluated. The main beam parameters (design values) of KEKB and Super KEKB related to the CBI are given in Table II.…”

Section: Growth Rate Of a Coupled Bunch Instabilitymentioning

confidence: 99%

“…For the clearing electrode, on the other hand, the effect of some tilt and/or incline of the electrode on the clearing property may be interesting. The simulation about the clearing electrode is now proceeding [30].…”

Section: Future Planmentioning

confidence: 99%

“…The movable mask is an indispensable vacuum component for high luminosity machines, such as various factories at present or in the future [8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…The movable mask, therefore, has inherently a high beam impedance [1][2][3][4][5][6][7][13][14][15][16][17][18][19][20]. Actually, the present movable masks have caused excess heating of adjacent vacuum components, such as the bellows chambers, gate valves, and pump elements, due to the excited higher order modes (HOM) [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Design study of a movable mask with low beam impedance

Suetsugu

Shibata

Morishige³

et al. 2006

Phys. Rev. ST Accel. Beams

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A novel design of a movable mask (collimator) for high-current accelerators is proposed. The mask head is supported by a ceramic rod to reduce interference with the beam. One side of the support is coated with a thin ( 1 m) conductive material to avoid extra charge up of the head. The head is also made of ceramics to avoid direct damage from an intense beam. To investigate the availability of the new movable mask, the rf properties, such as the impedances of trapped modes and the loss factors, were evaluated by simulation codes. The frequencies and the Q values of the trapped modes were also measured using a test model, and compared with calculated ones. Two trial modes for KEKB are being manufactured, and will be tested with beams next year.

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