In the RHIC spin experiment, the high intensity polarized H- ion source is
requested. The required 2x10(32)/s cm(2) luminosity in RHIC can be obtained
with a 0.5 mA injected H- ion beam intensity. In order to realize such bea
m intensity, a KEK optically pumped polarized H- ion source is being upgrad
ed at TRIUMF for future installation at RHIC. The first results of polariza
tion measurements are presented here. (C) 2000 American Institute of Physic
s. [S0034- 6748(00)50602-9].