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SUMMARY:Selected issues of influence irradiation on characteristics of sup
 erconducting elements in modern FEL-s facilities
DTSTART;VALUE=DATE-TIME:20220706T145000Z
DTEND;VALUE=DATE-TIME:20220706T150500Z
DTSTAMP;VALUE=DATE-TIME:20260305T073338Z
UID:indico-contribution-708@events.ncbj.gov.pl
DESCRIPTION:Speakers: Jacek Sosnowski (NCBJ)\nCurrently developed free ele
 ctron lasers facilities more and more frequently use superconducting eleme
 nts in theirs advanced constructions. Most frequent examples of these appl
 ications are the superconducting electromagnets\, current leads to them an
 d especially superconducting cavities. The same concerns the superconducti
 ng shields\, as well as superconducting correction coils conducting the el
 ectron beam along the appropriate way. Beside of numerous advantages of us
 ing these new materials\, there arise however then new effects\, especiall
 y connected with the influence of the irradiation appearing in FEL acceler
 ators on the current carrying properties of the unique superconducting mat
 erials. The irradiation is caused here by primary electrons beam as well a
 s by secondary beams\,composed from neutrons\, gamma-rays and photons\, wh
 ich are created then. In the paper are discussed therefore the advantages 
 but also problems arising\, while using superconductors in modern accelera
 tors\, working in irradiation environment. It is shown in which way the ir
 radiation effects damage the subtle structure of superconducting materials
 \, including 2D HTc superconductors\, in which columnar defects are formed
 . In the paper it will be analysed\, in which way these structural defects
  influence the current carrying properties of the superconducting material
 s. It will be developed therefore the energetical approach to the process 
 of capturing on the nano-defects of the magnetic pancake vortices\, charac
 teristic for HTc superconductors. Various initial positions of the capture
 d vortices will be analysed\,  movement of them will lead to the potential
  barrier decrease. The influence of the radiational defects on the current
 -voltage characteristics will be investigated then and maximal current den
 sity values detected\, as the function  of irradiation intensity and physi
 cal parameters as magnetic field and temperature. These researches have th
 erefore pure scientific meaning as well as can be useful for prediction of
  the proper work of superconducting solenoids and current leads to them in
  radiational environmen. Analysis can be also extended on the case of micr
 o-cracks and dislocational defects formed during the mechanical winding of
  superconducting coils and arising then bending strain.\n\nhttps://events.
 ncbj.gov.pl/event/75/contributions/708/
LOCATION:Novotel Warszawa Centrum Róża
URL:https://events.ncbj.gov.pl/event/75/contributions/708/
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