Author: Briquez, F.
Paper Title Page
MOP004
 Optimization of APPLE-II Quasiperiodic Undulators at SOLEIL and Spectral Peformances  
 
  • F. Briquez, M.-E. Couprie, N. Jaouen, O. Marcouillé, M. Valléau
    SOLEIL, Gif-sur-Yvette, France
  
  The in­tro­duc­tion of a slight ape­ri­od­ic­ity in an un­du­la­tor en­ables to gen­er­ate ir­ra­tional har­mon­ics, for the dis­tinc­tion be­tween a one or two pho­ton process. In the case of an AP­PLE-II un­du­la­tor gen­er­at­ing var­i­ous types of po­lar­iza­tions, the ape­ri­od­ic­ity is gen­er­ally in­tro­duced by shift­ing ver­ti­cally some mag­nets on ar­rays. The op­ti­miza­tion of the sys­tem is not fully sat­is­fy­ing since dif­fer­ent op­tima of mag­net dis­place­ments are found for the var­i­ous po­lar­iza­tion modes, as re­ported in ex­am­ples from SOLEIL un­du­la­tors. Be­sides, the in­ten­sity of the first har­mon­ics is slightly re­duced. In ad­di­tion, a resid­ual pho­ton sig­nal ap­pears be­tween pseudo-har­mon­ics. Mea­sured spec­tra from built AP­PLE-II un­du­la­tors at SOLEIL are com­pared to cal­cu­lated ones from mag­netic mea­sure­ments, and con­firm these ob­served trends, and in par­tic­u­lar the resid­ual struc­ture be­tween the pseudo-har­mon­ics. An an­a­lytic ap­proach is given and con­se­quences for sci­en­tific ap­pli­ca­tions are also dri­ven.  
 
TUP086 Experiment Preparation Towards a Demonstration of Laser Plasma Based Free Electron Laser Amplification 569
 
  • M.-E. Couprie, C. Benabderrahmane, P. Berteaud, C. Bourassin-Bouchet, F. Bouvet, F. Briquez, L. Cassinari, L. Chapuis, M.E. El Ajjouri, C. Herbeaux, N. Hubert, M. Labat, A. Lestrade, A. Loulergue, J. Lüning, O. Marcouillé, J.L. Marlats, F. Marteau, C. Miron, P. Morin, F. Polack, K. Tavakoli, M. Valléau, D. Zerbib
    SOLEIL, Gif-sur-Yvette, France
  • I.A. Andriyash, G. Lambert, V. Malka, C. Thaury
    LOA, Palaiseau, France
  • S. Bielawski, C. Evain, C. Szwaj
    PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
  • X. Davoine
    CEA/DAM/DIF, Arpajon, France
  
  One di­rec­tion to­wards com­pact Free Elec­tron Laser is to re­place the con­ven­tional linac by a laser plasma dri­ven beam, pro­vided proper elec­tron beam ma­nip­u­la­tion to han­dle the value of the en­ergy spread and of the di­ver­gence. Ap­ply­ing seed­ing tech­niques also en­ables to re­duce the re­quired un­du­la­tor length. Rapidly de­vel­op­ing Laser Wake­field Ac­cel­er­a­tors (LWFA) are al­ready able to gen­er­ate syn­chro­tron ra­di­a­tion. With the presently achieved elec­tron di­ver­gence and en­ergy spread an ad­e­quate beam ma­nip­u­la­tion through the trans­port to the un­du­la­tor is needed for FEL am­pli­fi­ca­tion. A test ex­per­i­ment for the demon­stra­tion of FEL am­pli­fi­ca­tion with a LWFA is under prepa­ra­tion in the frame of the COX­INEL ERC con­tract in the more gen­eral con­text of LUNEX5. Elec­tron beam trans­port fol­lows dif­fer­ent steps with strong fo­cus­ing thanks to vari­able strength per­ma­nent mag­net quadrupoles, demix­ing chi­cane with con­ven­tional dipoles, and a sec­ond set of quadrupoles for fur­ther fo­cus­ing in the un­du­la­tor. Progress on the equip­ment prepa­ra­tion and ex­pected per­for­mance are de­scribed.  
 
TUP087 The Status of LUNEX5 Project 574
 
  • M.-E. Couprie, C. Benabderrahmane, P. Berteaud, C. Bourassin-Bouchet, F. Bouvet, F. Briquez, L. Cassinari, L. Chapuis, J. Daillant, M. Diop, M.E. El Ajjouri, C. Herbeaux, N. Hubert, M. Labat, P. Lebasque, A. Lestrade, A. Loulergue, P. Marchand, O. Marcouillé, J.L. Marlats, C. Miron, P. Morin, A. Nadji, F. Polack, F. Ribeiro, J.P. Ricaud, P. Roy, K. Tavakoli, M. Valléau, D. Zerbib
    SOLEIL, Gif-sur-Yvette, France
  • S. Bielawski
    PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
  • B. Carré, D. Garzella
    CEA/DSM/DRECAM/SPAM, Gif-sur-Yvette, France
  • X. Davoine
    CEA/DAM/DIF, Arpajon, France
  • N. Delerue
    LAL, Orsay, France
  • G. Devanz, A. Mosnier
    CEA/DSM/IRFU, France
  • A. Dubois, J. Lüning
    CCPMR, Paris, France
  • C. Evain, E. Roussel, C. Szwaj
    PhLAM/CERLA, Villeneuve d'Ascq, France
  • G. Lambert, R. Lehé, V. Malka, A. Rousse, C. Thaury
    LOA, Palaiseau, France
  • C. Madec
    CEA/IRFU, Gif-sur-Yvette, France
  
  LUNEX5 (free elec­tron Laser Using a New ac­cel­er­a­tor for the Ex­ploita­tion of X-ray ra­di­a­tion of 5th gen­er­a­tion) aims at in­ves­ti­gat­ing the pro­duc­tion of short, in­tense, co­her­ent Free Elec­tron Laser (FEL) pulses in the 40-4 nm spec­tral range. It com­prises a 400 MeV su­per­con­duct­ing Lin­ear Ac­cel­er­a­tor for high rep­e­ti­tion rate op­er­a­tion (10 kHz), multi-FEL lines and adapted for stud­ies of ad­vanced FEL schemes, a 0.4 - 1 GeV Laser Wake Field Ac­cel­er­a­tor (LWFA) for its qual­i­fi­ca­tion by a FEL ap­pli­ca­tion, a sin­gle un­du­la­tor line en­abling seed­ing with High order Har­monic in Gas and echo con­fig­u­ra­tions and pilot user ap­pli­ca­tions. Con­cern­ing the su­per­con­duct­ing linac, the elec­tron beam dy­nam­ics has been mod­i­fied from a scheme using a third har­monic lin­earizer and a com­pres­sion chi­cane to dog-leg cou­pled to sex­tupoles. Be­sides, the choice of the gun is under re­vi­sion for ful­fill­ing to 10 kHz rep­e­ti­tion rate. Fol­low­ing trans­port the­o­ret­i­cal stud­ies of lon­gi­tu­di­nal and trans­verse ma­nip­u­la­tion of a LWFA elec­tron beam en­abling to pro­vide the­o­ret­i­cal am­pli­fi­ca­tion, a test ex­per­i­ment is under prepa­ra­tion in col­lab­o­ra­tion with the Lab­o­ra­toire d’Op­tique Ap­pliquée to­wards an ex­per­i­men­tal demon­stra­tion.