Energy optimization procedure for treatment planning with laser‐accelerated protons

Fourkal, E; Velchev, I.; Jiang, Fan; Luo, Wei; Ma, C

doi:10.1118/1.2431424

Cited by 42 publications

(22 citation statements)

References 17 publications

(18 reference statements)

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“…Target engineering is crucial to get the mono-energetic ion beams [2]. These ion beams have extremely short duration (∼fs), highly collimated and are relatively easy to produce, which makes them suitable for many applications, such as proton imaging [3], ion therapy [4], ion beam ignition of laser fusion targets [5] and so on. It was recently suggested to utilize the circularly polarized (CP) laser pulses for very high energy ion acceleration [6].…”

mentioning

confidence: 99%

Stabilized radiation pressure dominated ion acceleration from surface modulated thin-foil targets

et al. 2011

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We study transverse and longitudinal electron heating effects on the target stability and the ion spectra in the radiation pressure dominated regime of ion acceleration by means of multi dimensional particle-in-cell (PIC) simulations. Efficient ion acceleration occurs when the longitudinal electron temperature is kept as low as possible. However, tailoring of the transverse electron temperature is required in view of suppressing the transverse instability, which can keep the target structure intact for longer duration during the acceleration stage. We suggest using the surface erosion of the target to increase the transverse temperature, which improves both the final peak energy and the spectral quality of the ions in comparison with a normal flat target.PACS numbers: 41.75. Jv, 52.38.Kd In recent years, ion acceleration from thin foil targets has emerged as one of key areas of research in the field of laser plasma interaction [1]. The laser foil target interaction can produce energetic ions with energies as high as 56MeV per nucleon. Target engineering is crucial to get the mono-energetic ion beams [2]. These ion beams have extremely short duration (∼fs), highly collimated and are relatively easy to produce, which makes them suitable for many applications, such as proton imaging [3], ion therapy [4], ion beam ignition of laser fusion targets [5] and so on. It was recently suggested to utilize the circularly polarized (CP) laser pulses for very high energy ion acceleration [6]. In the case of CP pulse, the electron heating is dramatically reduced, thus ion acceleration doesn't occur due to the target normal sheath acceleration (TNSA), instead radiation pressure acceleration (RPA) dominates. Though energy scalings predicted by 1D theory of RPA regime of acceleration have been reproduced very well in numerous one dimensional particle-in-cell (PIC) simulations, the accelerated target is far less stable in a real 3D geometry compare to 1D geometry. For instance, in the case of a Gaussian pulse interacting with a flat target, target deformation occurs, which leads to the broadening of the final energy spectrum, and reduces the energy conversion efficiency; though it can be overcome by the use of shaped targets [7]. Another major bottleneck in the ion acceleration is the excitation of the Rayleigh-Taylor like instabilities, which leads to the breaking of the target [8,9]. Thus, efficacy of the RPA scheme is limited by the onset of the Rayleigh-Taylor like instability; which also appears to be a cause of great concern in ion beam driven fast ignition. Prevention of this instability is an important problem which needs to be addressed quickly.As described above, the RPA mechanism dominates when the electron heating is suppressed; this condition can be fairly met if one resorts to the use of the CP laser pulses. However, the onset of the Rayleigh-Taylor like instability, also known as transverse instability, remain a concern for the CP laser pulses. With regards to electron temperature, there is tradeoff as large perpe...

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confidence: 99%

Stabilized radiation pressure dominated ion acceleration from surface modulated thin-foil targets

et al. 2011

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“…To achieve such motion, we tailor laser beam such that the radiation pressure exerted on the target P = (2I/c)(1 − v/c)/(1 + v/c), where v is the target velocity, remains constant [22]. Using the relativistic formula for target velocity v = gt/(1 + g 2 t 2 /c 2 ) 1/2 , one can find that P = P 0 = const when laser intensity I(t) = I 0 /(1 − gt/c) 2 , where I 0 = I(0) and it is assumed that laser emission time is less than c/g.…”

Section: Analytical Descriptionmentioning

confidence: 99%

“…High energy ion beams have a variety of potential applications, such as proton therapy [1][2][3], radiography [4], ion beam fast ignition [5], and laboratory astrophysics [6].…”

Section: Introductionmentioning

confidence: 99%

Monoenergetic ion acceleration in the RPA regime in the limits of high/low electron temperatures

Khudik¹,

Zhang²,

Shvets³

2016

AIP Conference Proceedings

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“…1), N tail = m i g/4πe 2 , where m i is the proton mass. This positively charged tail creates the longitudinal electric field E z , which prevents further losses of ions from the target and pushes target ions with constant acceleration.…”

Section: Structure Of the Targetmentioning

confidence: 99%

“…Laser-accelerated multi-MeV ion beams have a variety of potential applications, such as proton therapy [1,2,3], radiography [4], ion beam fast ignition [5], and laboratory astrophysics [6].…”

Section: Introductionmentioning

confidence: 99%

Monoenergetic acceleration of a target foil by circularly polarized laser pulse in RPA regime without thermal heating

Khudik¹,

Yi²,

Siemon³

et al. 2013

AIP Conference Proceedings

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Energy optimization procedure for treatment planning with laser‐accelerated protons

Cited by 42 publications

References 17 publications

Stabilized radiation pressure dominated ion acceleration from surface modulated thin-foil targets

Stabilized radiation pressure dominated ion acceleration from surface modulated thin-foil targets

Monoenergetic ion acceleration in the RPA regime in the limits of high/low electron temperatures

Monoenergetic acceleration of a target foil by circularly polarized laser pulse in RPA regime without thermal heating

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