  Since a wider aperture has been obtained along the Booster beam line, this
opens the opportunity for Booster running a higher intensity beam than ever
before. Sooner or later, the available RF accelerating voltage will become a
new limit for the beam intensity. Either by increasing the RFSUM or by reducing
the accelerating rate can achieve the similar goal. The motivation for the
6-GeV study is to gain the relative accelerating voltage via a slower
acceleration.
