▁The ▁chief ▁advantage ▁of ▁the ▁syn ch ro cy cl ot ron ▁is ▁that ▁there ▁is ▁no ▁need ▁to ▁restrict ▁the ▁number ▁of ▁revolution s ▁executed ▁by ▁the ▁ion ▁before ▁its ▁exit . ▁As ▁such , ▁the ▁potential ▁difference ▁supplied ▁between ▁the ▁de es ▁can ▁be ▁much ▁smaller . ▁ ▁The ▁smaller ▁potential ▁difference ▁needed ▁across ▁the ▁gap ▁has ▁the ▁following ▁uses : ▁ ▁There ▁is ▁no ▁need ▁for ▁a ▁narrow ▁gap ▁between ▁the ▁de es ▁as ▁in ▁the ▁case ▁of ▁conventional ▁cycl ot ron , ▁because ▁strong ▁electric ▁fields ▁for ▁producing ▁large ▁acceleration ▁are ▁not ▁required . ▁Thus ▁only ▁one ▁de e ▁can ▁be ▁used ▁instead ▁of ▁two , ▁the ▁other ▁end ▁of ▁the ▁oscill ating ▁voltage ▁supply ▁being ▁connected ▁to ▁earth . ▁The ▁magnetic ▁pole ▁pieces ▁can ▁be ▁brought ▁closer , ▁thus ▁making ▁it ▁possible ▁to ▁increase ▁greatly ▁the ▁magnetic ▁flux ▁density . ▁The ▁frequency ▁val ve ▁oscill ator ▁is ▁able ▁to ▁function ▁with ▁much ▁greater ▁efficiency . ▁ ▁Dis adv antages ▁The ▁main ▁draw back ▁of ▁this ▁device ▁is ▁that , ▁as ▁a ▁result ▁of ▁the ▁variation ▁in ▁the ▁frequency ▁of ▁the ▁oscill ating ▁voltage ▁supply , ▁only ▁a ▁very ▁small ▁fraction ▁of ▁the ▁ ions ▁leaving ▁the ▁source ▁are ▁captured ▁in ▁phase - stable ▁or bits ▁of ▁maximum ▁radius ▁and ▁energy ▁with ▁the ▁result ▁that ▁the ▁output ▁beam ▁current ▁has ▁a ▁low ▁duty ▁cycle , ▁and ▁the ▁average ▁beam ▁current ▁is ▁only ▁a ▁small ▁fraction ▁of ▁the ▁instant aneous ▁beam ▁current . ▁Thus ▁the ▁machine ▁produces ▁high ▁energy ▁