High intensity issues for super B-factories

The present B-factories, KEKB and PEP-II, have achieved or exceeded their design luminosities. A luminosity of 10³⁴ cm^-2 s^-1 has become a reality. As upgrading of these machines to increase the luminosity further by ten times or more to extend the physics coverage, Super B-factories are being considered. Beam current should be about 10 A in the Low Energy Ring (LER) and 4 A in the High Energy Ring (HER), or even much higher, with a short bunch length of about 3 mm. It is very challenging for various hardware components, especially for RF system and beam-line vacuum components, to store such an extremely high beam current. Crab crossing is also considered to drastically increase the beam-beam tune shift limit, that results in a further increase of the luminosity. In this paper, high intensity issues for the Super B-factories are discussed.