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We analyze the use of a relativistic laser pulse with a controlled frequencychirp incident on a rising plasma density gradient to drive an accelerationstructure for proton and light-ion acceleration. The Chirp Induced TransparencyAcceleration (ChITA) scheme is described with an analytical model of thevelocity of the snowplow at critical density on a pre-formed rising plasmadensity gradient that is driven by a positive-chirp in the frequency of arelativistic laser pulse. The velocity of the ChITA-snowplow is shown to dependupon rate of rise of the frequency of the relativistic laser pulse representedby $\frac{\epsilon_0}{\theta}$ where, $\epsilon_0 =\frac{\Delta\omega_0}{\omega_0}$ and chirping spatial scale-length, $\theta$,the normalized magnetic vector potential of the laser pulse $a_0$ and theplasma density gradient scale-length, $\alpha$. We observe using 1-D OSIRISsimulations the formation and forward propagation of ChITA-snowplow, beingcontinuously pushed by the chirping laser at a velocity in accordance with theanalytical results. The trace protons reflect off of this propagating snowplowstructure and accelerate mono-energetically. The control over ChITA-snowplowvelocity allows the tuning of accelerated proton energies.

Proton acceleration by a relativistic laser frequency-chirp driven plasma snowplow