ions , ▁though ▁with ▁compar atively ▁low ▁intensity . ▁ ▁The ▁next ▁development ▁step ▁of ▁the ▁cycl ot ron ▁concept , ▁the ▁is och ron ous ▁cycl ot ron , ▁maintain s ▁a ▁constant ▁R F ▁driving ▁frequency ▁and ▁compens ates ▁for ▁relativ istic ▁effects ▁by ▁increasing ▁the ▁magnetic ▁field ▁with ▁radius . ▁I so chron ous ▁cycl ot rons ▁are ▁capable ▁of ▁producing ▁much ▁greater ▁beam ▁current ▁than ▁syn ch ro cy cl ot rons . ▁As ▁a ▁result , ▁is och ron ous ▁cycl ot rons ▁became ▁more ▁popular ▁in ▁the ▁research ▁field . ▁ ▁History ▁ ▁In ▁ 1 9 4 5 , ▁Robert ▁L yst er ▁Thor nt on ▁at ▁Ernest ▁Lawrence ' s ▁Rad iation ▁Labor atory ▁led ▁the ▁construction ▁of ▁the ▁▁ 7 3 0 ▁Me V ▁cycl ot ron . ▁In ▁ 1 9 4 6 , ▁he ▁o vers aw ▁the ▁conversion ▁of ▁the ▁cycl ot ron ▁to ▁the ▁new ▁design ▁made ▁by ▁Mc Mill an ▁which ▁would ▁become ▁the ▁first ▁syn ch ro cy cl ot ron ▁with ▁could ▁produce ▁ 1 9 5   Me V ▁de uter ons ▁and ▁ 3 9 0   Me V ▁α - part icles . ▁ ▁After ▁the ▁first ▁syn ch ro cy cl ot ron ▁was ▁oper ational , ▁the ▁Office ▁of ▁Naval ▁Research ▁( ON R ) ▁fund ed ▁two ▁syn ch ro cy cl ot ron ▁construction ▁initi atives . ▁The ▁first ▁fund ing ▁was ▁in ▁ 1 9 4 6 ▁for ▁Car