Speaker
Description
We present the design and initial amplification stages of a seeded Master Oscillator Power Amplifier (MOPA) laser for H- beam shaping applications. Customizable modulation of the input (seed) laser pulse shape will be shown to optimize the amplified laser pulse shape output at the nanosecond level, allowing for high speed ‘notching’ or ‘trimming’ of photo-ionized H- bunch shapes. By matching the laser pulse train shape to the inverse of the desired H- bunch shape, the design of our laser system will be theoretically applied to the selective longitudinal neutralization of low energy (1 MeV) H- beams. Theoretically needed pulse energies for high percentage photo-ionizations above 99.9% will be presented and challenges for reaching the required laser pulse energies and repetition rates will be discussed. Finally, we will examine the potential for using these custom laser pulse trains to trim residual tails the H- beam through complex laser pulse shape and multiple laser – bunch interactions in a specially designed high reflectively laser cavity, reducing the total power required to reach high neutralization efficiency.
Funding Agency
Los Alamos National Laboratory
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