• F.E. Hannon, S.V. Benson, D. Douglas, P. Evtushenko, J.M. Klopf, G. Neil, C. Tennant, G.P. Williams, S. Zhang
  JLAB, Newport News, Virginia

Jefferson Laboratory is proposing to construct a next generation light source that capitalizes on the existing infrastructure of the Energy Recovery Linac (ERL) based Free Electron Laser (FEL) that has been operational since 1998. The new user facility, called JLAMP, will feature a two-pass superconducting linac to accelerate electron bunches to 600MeV with the possibility of energy recovery. The photon source will be a seeded amplifier FEL that covers the 10 to 100eV energy range, capable of providing up to seven orders of magnitude increase in average brightness over existing sources. At longer wavelengths the device will also have the option of operating as a high gain resonator for users who desire a higher repetition rate. The design options and technical challenges associated with the development of the JLAMP machine are presented here.

• F.E. Hannon, S.V. Benson, G.H. Biallas, D.B. Bullard, F.K. Ellingsworth, P. Evtushenko, C. Hernandez-Garcia, K. Jordan, M. Marchlik
  JLAB, Newport News, Virginia

A new 500kV DC photocathode electron gun is being developed at Jefferson Laboratory (JLab) with the aim of improving on the performance of the present FEL injector. The design benefits from the use of two inverted ceramic insulators to allow for a photocathode preparation chamber and load-lock system to be placed directly behind the gun. The electrostatic design emphasises the requirement to minimise the electric field gradients on the internal surfaces and incorporates shaped electrodes to provide some transverse focusing to the electron beam. Finally, provisions have been made to maintain ultra high vacuum conditions inside the gun chamber to prolong cathode lifetime during CW operation. This paper presents an overview of the electron gun and load-lock design.