We investigate the quantum regime of a high-gain free-electron laser (FEL) starting from noise. In the first part, we neglect the radiation propagation and we formulate a quantum linear theoryof the N-particle free-electron laser Hamiltonian model, quantizing both the radiation field and the electron motion. Quantum effects such as frequency shift, line narrowing, quantum limitation for bunching and energy spread and minimum uncertainty states are described. Using a second quantization formalism we demonstrate quantum entanglement between the recoiling electrons and the radiation field. In the second part, we describe the field classically but we include propagation effects (i.e. slippage) and we demonstrate the novel regime of quantum SASE with high temporal coherence and discrete spectrum. Furthermore, we describe "quantum purification" of SASE: the classical chaotic spiking behavior disappears and the spectrum becomes a series of discrete very narrow lines which correspond to transitions between discrete momentum eigenstates (which originate high temporal coherence).

Quantum regime of free electron lasers starting from noise / R. Bonifacio, N. Piovella, G.R.M. Robb, A. Schiavi. - In: PHYSICAL REVIEW SPECIAL TOPICS. ACCELERATORS AND BEAMS. - ISSN 1098-4402. - 9:9(2006 Sep 05), pp. 090701.090701-1-090701.090701-9.

Quantum regime of free electron lasers starting from noise

R. Bonifacio
Primo
;
N. Piovella
Secondo
;
2006

Abstract

We investigate the quantum regime of a high-gain free-electron laser (FEL) starting from noise. In the first part, we neglect the radiation propagation and we formulate a quantum linear theoryof the N-particle free-electron laser Hamiltonian model, quantizing both the radiation field and the electron motion. Quantum effects such as frequency shift, line narrowing, quantum limitation for bunching and energy spread and minimum uncertainty states are described. Using a second quantization formalism we demonstrate quantum entanglement between the recoiling electrons and the radiation field. In the second part, we describe the field classically but we include propagation effects (i.e. slippage) and we demonstrate the novel regime of quantum SASE with high temporal coherence and discrete spectrum. Furthermore, we describe "quantum purification" of SASE: the classical chaotic spiking behavior disappears and the spectrum becomes a series of discrete very narrow lines which correspond to transitions between discrete momentum eigenstates (which originate high temporal coherence).
FEL ; QUANTUM ; COHERENCE ;LASER ; RAGGI X
Settore FIS/03 - Fisica della Materia
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/25330
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