Author: Norum, W.E.
Paper Title Page
MOAL3 Diagnostic for a High Repetition Rate Electron Photo-Gun and First Measurements 4
 
  • D. Filippetto, S. De Santis, L.R. Doolittle, G. Huang, W.E. Norum, G.J. Portmann, H.J. Qian, F. Sannibale, R.P. Wells
    LBNL, Berkeley, California, USA
  
  Funding: DOE grants No. DE-AC02-05CH11231
The APEX elec­tron source at LBNL com­bines the high-rep­e­ti­tion-rate with the high beam brigth­ness typ­i­cal of photo-guns, de­liv­er­ing low emit­tance elec­tron pulses at MHz fre­quency. Prov­ing the high beam qual­ity of the beam is an es­sen­tial step for the suc­cess of the ex­per­i­ment, open­ing the doors of the high av­er­age power to bright­ness-hun­gry ap­pli­ca­tions as X-Ray FELs, MHz ul­tra­fast elec­tron dif­frac­tion etc. As first step, a full 6D char­ac­ter­i­za­tion of the beam is fore­seen at the Gun beam en­ergy of 750 keV. Di­ag­nos­tics for low and high cur­rent mea­sure­ments have been in­stalled and tested, and mea­sure­ments of cath­ode life­time and ther­mal emit­tance in a RF en­vi­ron­ment are cur­rently being com­mis­sioned. The re­cently in­stalled dou­ble slit sys­tem will allow the mea­sure­ments of beam emit­tance at full cur­rent (mA). Also a de­flect­ing cav­ity and a high pre­ci­sion spec­trom­e­ter are fore­seen at low en­ergy, al­low­ing the ex­plo­ration of the lon­gi­tu­di­nal phase space. Here we dis­cuss the pre­sent lay­out of the ma­chine and fu­ture up­grades, show­ing the lat­est re­sults at low and high rep­e­ti­tion rate, to­gether with the tools and tech­niques used. 		 
slides icon Slides MOAL3 [10.786 MB]  
 
MOPC24 Design Of The Stripline BPM For The Advanced Photoinjector Experiment 108
 
  • S. De Santis, M.J. Chin, D. Filippetto, W.E. Norum, Z. Paret, G.J. Portmann, F. Sannibale, R.P. Wells
    LBNL, Berkeley, California, USA
  
  Funding: Work supported by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231
We de­scribe the de­sign, bench test­ing, and ini­tial com­mis­sion­ing of the shorted striplines beam po­si­tion mon­i­tors used in the Ad­vanced Pho­toin­jec­tor Ex­per­i­ment (APEX) at Lawrence Berke­ley Na­tional Lab­o­ra­tory. Our BPM's are char­ac­ter­ized by ex­treme com­pact­ness, being de­signed to fit in the vac­uum cham­ber of the quadru­pole mag­nets, with only a short por­tion in­clud­ing the RF feedthroughs oc­cu­py­ing ad­di­tional beam pipe length. In this paper we il­lus­trate the de­sign process, which in­cluded ex­ten­sive 3D com­puter sim­u­la­tions, the bench test­ing of pro­to­type and final com­po­nents, and the first mea­sure­ments with beam. The read­out elec­tron­ics is also de­scribed.