Author: Pellegrini, C.
Paper Title Page
WEXA01 Challenges of 4th Generation Light Sources 3798
 
  • C. Pellegrini
    SLAC, Menlo Park, California, USA
  • C. Pellegrini
    UCLA, Los Angeles, California, USA
  
  In the last few years Free Elec­tron Lasers (FELs) have emerged as ex­cep­tion­al­ly ex­cit­ing tools for new sci­ence. The re­sults from FLASH (Ham­burg) on bi­o­log­i­cal imag­ing, LCLS (Stan­ford) which gen­er­at­ed the first hard X-ray las­ing and the pro­jects pro­posed or in costruc­tion around the world are rapid­ly mov­ing the sci­en­tif­ic com­mu­ni­ty to the so called “fast sci­ence” which de­mands ul­tra­short puls­es, fs syn­chro­niza­tion, high bright­ness, high co­her­ence X-rays. The basic SASE FEL pro­cess used so far con­verts en­er­gy jit­ter into jit­ter of the cen­tral­wave­length. Pro­cess­es based on seed­ing and HGHG seem to offer a num­ber of ad­van­tages in terms of band­width, co­her­ence, sta­bil­i­ty and un­du­la­tor length. This talk will pre­sent an overview of the 4th gen­er­a­tion light sources, dis­cussing the main chal­lenges af­ford­ed in the con­struc­tion of the op­er­at­ing fa­cil­i­ties and con­sid­er­ing the trends for the de­vel­op­ment of fu­ture fa­cil­i­ties.  
slides icon Slides WEXA01 [10.640 MB]  
 
THPC183 Application of the Balanced Hybrid Mode in Overmoded Corrugated Waveguides to Short Wavelength Dynamic Undulators 3326
 
  • S.G. Tantawi, G.B. Bowden, C. Chang, J. Neilson, M. Shumail
    SLAC, Menlo Park, California, USA
  • C. Pellegrini
    UCLA, Los Angeles, California, USA
  
  Funding: Work Supported by the US Department of Energy
In­spired by re­cent de­vel­op­ments in low-loss over­mod­ed com­po­nents and sys­tems for ul­tra-high power RF sys­tems, we ex­plored sev­er­al over­mod­ed waveg­uide sys­tems that could func­tion as RF un­du­la­tors. One promis­ing struc­ture is a cor­ru­gat­ed waveg­uide sys­tem op­er­at­ing at the hy­brid HE11 mode. This is a new ap­pli­ca­tion for that mode. Ini­tial cal­cu­la­tions in­di­cate that such a sys­tem can be op­er­at­ed at rel­a­tive­ly low power lev­els while ob­tain­ing large val­ues for the un­du­la­tor pa­ram­e­ters. RF sur­face fields are typ­i­cal­ly low enough to per­mit su­per­con­duct­ing op­er­a­tion. This tech­nol­o­gy could re­al­ize an un­du­la­tor with short wave­lengths and also dy­nam­ic con­trol of the un­du­la­tor pa­ram­e­ters in­clud­ing po­lar­iza­tion. We in­tro­duce the scal­ing laws gov­ern­ing such a struc­tures, and then show with exact sim­u­la­tions an un­du­la­tor de­sign that have a wave­length of about 1.4 cm with an un­du­la­tor pa­ram­e­ter K~1. This un­du­la­tor is in­tend­ed to be pow­ered by a 50 MW source at a fre­quen­cy of 11.4 GHz. We de­scribe the ex­per­i­men­tal setup for test­ing such a tech­nol­o­gy.