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Advanced Laser Systems for Accelerator Applications

Description:

Advanced laser systems are needed for photoinjectors, for Free Electron Laser Seeding, for current-enhanced self-amplified spontaneous emission (ESASE), for laser-ion stripping of hydrogen beams, and for laser wire beam profile measurements in proton particle accelerators. Grant applications are sought for the development of:

(1) High power laser oscillator systems for high repetition rate (1-100 MHz) electron guns that can deliver pulses of 10-100 ?J energy in the 1 ?m wavelength range, with pulses capable of being expanded to10-50 ps duration.

(2) Laser pulse shaping systems that can modify the laser pulse in 3D, in order to minimize emittance growth due to space charge effect in a photoinjector. Approaches of interest include pulse stacking, laser phase modulation, and others. In general, the pulse should have a homogeneous intensity distribution (10% modulation) confined in a sharp boundary in three dimensions, with either a cylindrical or ellipsoidal geometry.

(3) A mid-IR, carrier envelope phase (CEP) stabilized laser with tens of mJs of energy and a few carrier cycles within a Full-Width at Half-Max (FWHM) of 10-50 fs.

(4) A mid-IR (2.0 micron) laser for E-SASE, with a pulse under 100 fs, possibly CEP-stabilized in the energy range of a few mJ.

(5) Tunable lasers to be used as seeds for free electron lasers (FELs). The central wavelength should be within the wavelength range, 10-50 nm, and the laser should be continuously tunable within a band that is at least 20% of that wavelength range. Pulse duration should be adjustable and on order of 100 fs. Peak power within the pulse should be on order of 100 kW. Optical pulses should be reproducible on a shot-to-shot basis, with good temporal coherence within the pulse, good beam quality (M2<1.3), and a repetition rate of 100 kHz or greater.

(6) Lasers for laser-ion stripping of hydrogen beams. The lasers should have high repetition rate (~400 MHz), high peak power (~1MW), and picosecond 355 nm pulses to match the in-beam structure of the linac for Spallation Neutron Source (micropulses that are 50 ps long, separated by 2.5 ns, gated into minipulses of 650 ns that repeat at 1.058 MHz, and are bunched into 1 ms macropulses).

(7) A laser power-recycling cavity at 355 nm to reduce average laser power requirements for ion stripping. Important design criteria include compactness, a length to match bunch repetition rate, stabilization to a small fraction of a wavelength, protection of mirrors from electron and gamma radiation, and an in-vacuum configuration.

Questions – contact Eliane Lessner, Eliane.Lessner@science.doe.gov

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