Author: Ditta, J.
Paper Title Page
THPC106 Commissioning Status of the Fritz Haber Institute THz FEL 3137
 
  • A.M.M. Todd, H. Bluem, V. Christina, M.D. Cole, J. Ditta, D. Dowell, K. Jordan, R. Lange, J.H. Park, J. Rathke, T. Schultheiss, L.M. Young
    AES, Medford, NY, USA
  • W. Erlebach, S. Gewinner, H. Junkes, A. Liedke, G. Meijer, W. Schöllkopf, G. von Helden
    FHI, Berlin, Germany
  • S.C. Gottschalk
    STI, Washington, USA
  
  The THz Free-Elec­tron Laser (FEL) at the Fritz Haber In­sti­tute (FHI) of the Max Planck So­ci­ety in Berlin is de­signed to de­liv­er ra­di­a­tion from 3 to 300 mi­crons using a sin­gle-plane-fo­cus­ing mid-IR un­du­la­tor and a two-plane-fo­cus­ing far-IR un­du­la­tor that acts as a waveg­uide for the op­ti­cal mode. A key as­pect of the ac­cel­er­a­tor per­for­mance is the low lon­gi­tu­di­nal emit­tance, < 50 keV-psec, that is spec­i­fied to be de­liv­ered at 200 pC bunch charge and 50 MeV from a grid­ded thermion­ic elec­tron source. We uti­lize twin ac­cel­er­at­ing struc­tures sep­a­rat­ed by a chi­cane to de­liv­er the re­quired per­for­mance over the < 20 - 50 MeV en­er­gy range. The first struc­ture op­er­ates at near fixed field while the sec­ond struc­ture con­trols the out­put en­er­gy, which, under some con­di­tions, re­quires run­ning in a de­cel­er­at­ing mode. "First Light" is tar­get­ed for the cen­ten­ni­al of the spon­sor in Oc­to­ber 2011 and we will de­scribe progress in the com­mis­sion­ing of this de­vice to achieve this goal. Specif­i­cal­ly, the mea­sured per­for­mance of the ac­cel­er­at­ed elec­tron beam will be com­pared to de­sign sim­u­la­tions and the ob­served match­ing of the beam to the mid-IR wig­gler will be de­scribed.