|3/1/2010 1:30 PM||04:00 PM||ROB C|
|3/1/2010 1:30 PM||01:55 PM||G. Hoffstaetter||ROB C|
|3/1/2010 1:55 PM||02:20 PM||N. Nakamura||ROB C|
Our project aims at constructing a 5-GeV-class ERL-based light source in Japan. A two-loop 5-GeV ERL including a 7.5-GeV XFEL-O located in the KEK site is under design and as the first step of the project the compact ERL (full version: 2-loop structure, 245 MeV, 100 mA) will be constructed to demonstrate the expected ERL performance using key components. R&Ds on 500-kV photocathode DC gun, drive laser, injector beamline and superconducting cavities for injector and main linacs are in progress and optics design and error effects of the compact ERL injector and return loop have been studied. The East Counter Hall at KEK is being renewed as the compact ERL building. The first commissioning of the compact ERL will start with a minimum version (1-loop structure, 35 MeV, 10 mA) in FY2012.
|3/1/2010 2:20 PM||02:45 PM||S. Benson on behalf of the Jefferson Lab FEL team||ROB C|
The Jefferson Lab free-electron laser (FEL) group built the first high power FEL using an energy recovering linac (ERL). The original device was upgraded to a higher power, shorter wavelength, FEL in the near infrared and is now being upgraded to a near UV FEL. We have transported beam through the UVFEL beamline and will begin commissioning of the FEL this summer.
Work continues on improving the science and technology of ERLs. The SRF group at Jefferson Lab now has a good recipe for electro-polishing cavities that should allow very low Q operation essential for efficient ERL operation. We have also been exploring transport of beams through a recirculation loop and have found solutions that maintain beam quality.
We have submitted a proposal to upgrade the facility again to operate in the EUV region using an accelerator upgrade to a two-pass 600 MeV ERL. This source will be the highest average brightness EUV source in the world when it has been commissioned. A VHF gun developed by Lawrence Berkeley National Lab will be used to provide a high brightness electron source. A high repetition rate HHG source will be used to seed VUV operation so that the laser output is fully coherent with 30 fsec pulses.
* This work was supported by U.S. DOE Contract No. DE-AC05-84-ER40150, the Office of Naval Research, and the Joint Technology Office.
|3/1/2010 2:45 PM||03:10 PM||S. Smith||ROB C|
|3/1/2010 3:10 PM||03:35 PM||Bettina Kuske||ROB C|
The HZB is proposing to build an ERL demonstration facility (BERLinPro) at Berlin-Adlershof in order to explore the limits of high current, low emittance operation at 100 MeV.
• A 3-stage gun project is on its way and funded. Stage 1: A 1.6 cell NB cavity with a lead coating to enhance the quantum efficiency and a sc solenoid are incorporated into the existing cryostat HoBiCaT for beam dynamic studies. Stage 2 concentrates on the cathode infrastructure to reach 1-10mA in a dedicated gun cryostat. Stage 3 seeks the final BERLinPro parameters with high repetition rates, i.e. high current.
• Fundamental ‘Merger-only’ studies with ASTRA show that
o at 77pC a C-chicane, that is easier to incorporate into the machine design, will be more suitable than a Z-chicane, that clearly is superior at higher bunch charges.
o The bunch length after the merger will be at least 1 to 2ps due to the energy spread in the bunch even without space charge effects.
o Emittance after the merger depends strongly on the bunch length; bunch compression in the ring is expected to be less than 10-fold.
o We might use a Lambertson septum for the last merger dipole to save an extra chicane for the high energy beam
• Path length management is an issue, especially for a possible second turn (12cm adjustment). Out of the three approaches: mover, chicane or increasing the trajectory length in the central arc dipole, the last one seems the most feasible.
• Radiation requirements make an underground construction feasible with the advantage of reduced temperature fluctuation and vibrations.
|3/1/2010 4:30 PM||06:00 PM||ROB C|
|3/1/2010 4:30 PM||04:50 PM||J.D. Brock||ROB C|
|3/1/2010 4:50 PM||05:10 PM||G. Hoffstaetter||ROB C|
|3/1/2010 5:10 PM||05:30 PM||M. Borland||ROB C|
|3/1/2010 5:30 PM||06:00 PM||ROB C|