A torn Device for L.I. Gaining in Congress
HR-Sen conf com approves construction of $183-million 400-billion-electron-volt accelerator at Brookhaven Natl Laboratory; approves $10.5-million for start-up; device--an intersecting storage accelerator, which scientists refer to as Isabel-will be first of its scale in world; Repr Jerome A Ambro says it will restore US to supremacy in fields of high-energy and basic physics; he and Suffolk County Deputy Exec Arthur Bergman discuss econ impact for county; County Exec Klein hails Ambro; Dr Ronald Rau, dir of high-energy physics at Brookhaven, comments (M)