Author: Tennant, C.
Paper Title Page
THPC105 An Electron Bunch Compression Scheme for a Superconducting Radio Frequency Linear Accelerator Driven Light Source 3134
 
  • C. Tennant, S.V. Benson, D. Douglas, P. Evtushenko, R.A. Legg
    JLAB, Newport News, Virginia, USA
  
  Funding: Support by US DoE contract #DE-AC05-060R23177.
We de­scribe an elec­tron bunch com­pres­sion scheme suit­able for use in a light source driv­en by a su­per­con­duct­ing radio fre­quen­cy (SRF) linac. The key fea­ture is the use of a re­cir­cu­lat­ing linac to per­form the ini­tial bunch com­pres­sion. Phas­ing of the sec­ond pass beam through the linac is cho­sen to de-chirp the elec­tron bunch prior to ac­cel­er­a­tion to the final en­er­gy in an SRF linac ("af­ter­burn­er"). The final bunch com­pres­sion is then done at max­i­mum en­er­gy. This scheme has the po­ten­tial to cir­cum­vent some of the most tech­ni­cal­ly chal­leng­ing as­pects of cur­rent lon­gi­tu­di­nal match­es; name­ly trans­port­ing a fully com­pressed, high peak cur­rent elec­tron bunch through an ex­tend­ed SRF en­vi­ron­ment, the need for a RF har­mon­ic lin­eariz­er and the need for a laser heater. Ad­di­tion­al ben­e­fits in­clude a sub­stan­tial sav­ings in cap­i­tal and op­er­a­tional costs by ef­fi­cient­ly using the avail­able SRF gra­di­ent.