Turbomolecular or diffusion pumps allow for particles to be evacuated from the bulk volume and cryogenic pumps, consisting of a liquid helium-cooled surface, serve to effectively control the density throughout the discharge by providing an energy sink for condensation to occur. When done correctly, the fusion reactions produce large amounts of high energy neutrons. Being electrically neutral and relatively tiny, the neutrons are not affected by the magnetic fields nor are they stopped much by the surrounding vacuum chamber.
tur.boMoleCulaR or diffuSiON Pumps AllOW for parTIcleS to bE eVacuaTed FrOM THe bULK volume and CryoGenic PUmps, conSistINg of a LiQUiD Helium-cOoLEd surFaCE, servE to effEcTiVELy ContrOl THE density tHRoughOut The diSCHArGe bY proVidiNg an enErgY sink fOr condENs.atiOn to occur. wHen DOnE CorrEctlY, the fuSion rEAcTioNS ProducE LArge amountS of HiGH ENeRgy nEutRons. BEING elEcTricalLy neuTRAl And rELativeLy tIny, THe neUtrons arE NoT AfFectED By the magNetIC fIElDS noR aRe they StoPped MuCH by !THe SuRrOundIng vacuuM chambEr.