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Neil, G.

  
Paper Title Page
WG202 The JLab High Power ERL Light Source – Status and Plans  
 
  • G. Neil
    Jefferson Lab, Newport News, Virginia
 
  Funding: Supported by U. S. DOE Contract No. DE-AC05-84-ER40150, the Office of Naval Research, the Air Force Research Lab, the Army Night Vision Lab, and the Commonwealth of Virginia.

The THz/IR/UV photon source at Jefferson Lab is the first of a new generation of light sources based on an Energy-Recovered, (superconducting) Linac (ERL). The machine was designed with a 160 MeV electron beam and an average current of 10 mA in 75 MHz repetition rate 300 femtosecond bunches. These electron bunches pass through a magnetic chicane and therefore emit synchrotron radiation. Wavelengths longer than the electron bunch radiate coherently a broadband THz ~ half cycle pulse whose average brightness is > 5 orders of magnitude higher than synchrotron IR sources through the FIR with broadband THz production of 300 fs pulses with >200 W of average power. The FELs also provide record-breaking laser power: up to 10 kW of average power in the IR from 1 to 10 microns in 300 fs pulses at up to 74.85 MHz repetition rates. To date we have demonstrated 10 kW of power at 6 microns, 6.7 kW at 2.8 microns and 4.7 kW at 1.6 microns, and 2.4 kW at 1 micron. We have also lased at the third and fifth harmonics producing substantial average power. The THz and IR systems have been commissioned for users. The UV system is to follow in 2007 pending a resumption of funding. This paper will present the status of the system and discuss some of the discoveries we have made concerning the physics performance, and operational limitations of such a first generation ERL light source.

 
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WG215 Beam Abort Strategies and Beam Loss Tolerances  
 
  • G. Neil
    Jefferson Lab, Newport News, Virginia
 
  Funding: Supported by U. S. DOE Contract No. DE-AC05-84-ER40150, the Office of Naval Research, the Air Force Research Laboratory, the Army Night Vision Laboratory, and the Commonwealth of Virginia.

High power ERL light sources will transport substantial currents and have to deal with sizeable beam powers. In storage rings such beams “clean up” themselves rapidly so that continual beam loss is generally not a major issue. In contrast, ERLs use a fresh beam which generates halo continuously and that can lead to problems. Even small fractions of the beam lost in an uncontrolled manner can lead to unacceptable vacuum excursions, opening of vacuum seals or, in the worst case, penetration of the vacuum components or other linac hardware. This working group discussion will deal with methodologies for establishing beam loss limits, approaches for detecting such loss before damage can occur, and various means for terminating the electron beam production rapidly.

 
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