Keyword: scattering
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WEPSB03 System Power Microwave Impulse Compression Based on Double Forming Line radiation, accumulation, operation, plasma 159
 
  • G.O. Buyanov, P.G. Alexey, O.A. Andrey, A.P. Klachkov
    MEPhI, Moscow, Russia
  
  Key­words: dou­ble form­ing line (DFL), com­pres­sor mi­crowave pulses, mi­crowave plasma dis­charger, res­onator – stor­age, input power de­vice (an input power), en­ergy out­put de­vice. The first part is de­voted to the cal­cu­la­tion and de­sign com­pres­sor using a sin­gle-mode wave­guides. We in­ves­ti­gated the processes of ac­cu­mu­la­tion and en­ergy ex­trac­tion from the res­onator – stor­age of com­pres­sor, the de­pen­dence of the ef­fi­ciency of en­ergy ex­trac­tion from the com­pres­sor on the plasma pa­ra­me­ters of the dis­charge gap: n, q, m, v, r, h - the con­cen­tra­tion, charge, mass, the fre­quency of col­li­sions of free elec­trons, the ra­dius and height of the cylin­der through which flows the dis­charge. Re­fine­ment con­struc­tion site en­ergy out­put and its op­ti­miza­tion, match­ing wave­guide res­onator - drive to the wave­guide load in de­riv­ing en­ergy from the com­pres­sor mi­crowave was pro­duced. The con­cept of a multi-com­pres­sor DFL was pro­posed and op­ti­miza­tion under axial field was make to in­crease the di­elec­tric strength and re­duce the in­duc­tance of the dis­charge gap. In the sec­ond part of the paper ques­tions, the de­sign of the com­pres­sor DFL on over­sized wave­guides with work­ing mode H01n was dis­cusses. New con­struc­tions of power input de­vices was pro­pose that allow not only to pro­vid­ing the nec­es­sary cou­pling co­ef­fi­cient with the feed path, but also greatly re­duced the ex­ci­ta­tion of un­ac­cept­able modes in the res­onator – stor­age.  
 
WEPSB24 Comparison of Biological Impact of Proton and Ion Beams in Radiation Treatment target, ion, proton, heavy-ion 211
 
  • M.M. Kats
    ITEP, Moscow, Russia
  
  The work con­tains the com­par­i­son of bi­o­log­i­cal doses' dis­tri­b­u­tion cal­cu­lated for treat­ment of the same tar­gets by pro­ton and ion beams. Ad­van­tages of the ion beam are shown for tar­gets with dif­fer­ent sizes and with dif­fer­ent depths.  
 
WEPSB32 Positron Annihilation Spectroscopy at LEPTA Facility positron, electron, vacuum, background 231
 
  • P. Horodek, I.N. Meshkov
    JINR/DLNP, Dubna, Moscow region, Russia
  • A.G. Kobets, O. Orlov, A.A. Sidorin
    JINR, Dubna, Moscow Region, Russia
  
  Since 2009 year the LEPTA fa­cil­ity at Joint In­sti­tute for Nu­clear Re­search in Dubna is op­er­ated with positron beam. Today it is de­vel­oped into two di­rec­tions. The first one is get­ting or­thopositro­n­ium flux in flight. Slow positrons from 22Na source are ac­cu­mu­lated in Surko trap and then are in­jected into the ring where they should over­lap with elec­trons from the sigle-pass elec­tron beam. In this way the flux of or­thopositro­n­ium atoms will ap­pear and will be ob­served in the process of reg­is­tra­tion of gamma quanta from an­ni­hi­la­tion process. The sec­ond group of works fo­cuses on using the positron in­jec­tor for Positron An­ni­hi­la­tion Spec­troscopy (PAS) ap­pli­ca­tions. This method is ded­i­cated to de­tec­tion of struc­tural de­fects as va­can­cies in the solid body lat­tice. The lat­est progress of this tech­nique is strictly con­nected with mea­sure­ments of PAS char­ac­ter­is­tics using positron beams. The progress in the LEPTA de­vel­op­ment, the first re­sults ob­tained in the PAS, idea and ac­tual state of works con­cern­ing the con­struc­tion of the pulsed positron beam will be pre­sented. The cre­ation of pulsed positron beams is the mod­ern ten­dency in the PAS do­main. It al­lows to mea­sure the life­times of an­ni­hi­lat­ing positron in the depth ca. 1 mkm under the sur­face. It makes pos­si­ble the iden­ti­fi­ca­tion of kind of de­fect.