▁beam ▁in jections ▁and ▁vac u um ▁p ump ing . ▁ ▁Bre eder ▁blank et ▁O wing ▁to ▁very ▁limited ▁terrest rial ▁resources ▁of ▁tr it ium , ▁a ▁key ▁component ▁of ▁the ▁I TER ▁re actor ▁design ▁is ▁the ▁bre eder ▁blank et . ▁This ▁component , ▁located ▁adjacent ▁to ▁the ▁vac u um ▁vessel , ▁serves ▁to ▁produce ▁tr it ium ▁through ▁reaction ▁with ▁neut rons ▁from ▁the ▁pl asma . ▁There ▁are ▁several ▁re actions ▁that ▁produce ▁tr it ium ▁within ▁the ▁blank et . ▁ ▁produces ▁tr it ium ▁via ▁n , t ▁re actions ▁with ▁moder ated ▁neut rons , ▁ ▁produces ▁tr it ium ▁via ▁interactions ▁with ▁higher ▁energy ▁neut rons ▁via ▁n , nt ▁re actions . ▁Con cept s ▁for ▁the ▁bre eder ▁blank et ▁include ▁hel ium ▁co o led ▁l ith ium ▁lead ▁( HC LL ) ▁and ▁hel ium ▁co o led ▁p eb ble ▁bed ▁( H CP B ) ▁methods . ▁Six ▁different ▁Test ▁Bl ank et ▁Mod ules ▁( TB M ) ▁will ▁be ▁tested ▁in ▁I TER ▁and ▁will ▁share ▁a ▁common ▁box ▁geometry . ▁Material s ▁for ▁use ▁as ▁bre eder ▁p eb bles ▁in ▁the ▁H CP B ▁concept ▁include ▁l ith ium ▁met at itan ate ▁and ▁l ith ium ▁orth os il icate . ▁Re quire ments ▁of ▁bre eder ▁materials ▁include ▁good ▁tr it ium ▁production ▁and ▁extra ction , ▁mechanical ▁stability ▁and ▁low ▁activation ▁levels . ▁ ▁Mag net ▁system ▁The