Optical investigation of new pulsed magnet installation in KEK e-/e+ injector LINAC

SuperKEKB injector Linac is performing continuous injection to SuperKEKB e-/e+, PF, and PF-AR ring. For high quality beam required in SuperKEKB rings, pulsed magnets were installed in the Linac and the number of the pulsed magnets are still not enough. Especially, there is not pulsed quadrupole magnet in around capture section after e+ generation target. In this section, not only e+ beam but also e- beam is transported. Therefore, beam optics for e- is disturbed, while that for e+ beam is optimized. It is difficult to replace all DC magnets to pulsed magnets because of both limited budget and personnel. We performed optical study to squeeze β function after e+ generation target by the minimum number of pulsed quadrupole magnets. (author)