Production of radioactive nuclides by energetic protons generated from intense laser-plasma interactions

Santala, M.; Zepf, Matthew; Beg, F. N.; Clark, Ε. L.; Dangor, A. E.; Krushelnick, K.; Tatarakis, M.; Watts, I.; Ledingham, K. W. D.; McCanny, T.; Spencer, I.; Machacek, A.; Allott, R.; Clarke, R.J.; Norreys, P. A.

doi:10.1063/1.1335849

Cited by 141 publications

(56 citation statements)

References 12 publications

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“…8,9 Although the use of laser-plasma accelerators for high energy physics applications will require performance well beyond todays achievements, several applications with less stringent beam property requirements are becoming possible. One of these is radio-isotope production through (␥,n) reactions with laser accelerated bunches, 10,11 which requires a sufficient number of electrons with energy in excess of 10's of MeV, a condition that is relatively straightforward to obtain using laser-plasma-based accelerators. More recently, another application has been explored which exploits the short pulse nature and high charge of the accelerated bunches 12 for the production of coherent radiation.…”

Section: Introductionmentioning

confidence: 99%

Terahertz radiation from laser accelerated electron bunches

et al. 2004

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Coherent terahertz and millimeter wave radiation from laser accelerated electron bunches has been measured. The bunches were produced by tightly focusing (spot diameter ≈6 μm) a high peak power (up to 10 TW), ultra-short (⩾50 fs) laser pulse from a high repetition rate (10 Hz) laser system (0.8 μm), onto a high density (>1019 cm−3) pulsed gas jet of length ≈1.5 mm. As the electrons exit the plasma, coherent transition radiation is generated at the plasma-vacuum boundary for wavelengths long compared to the bunch length. Radiation in the 0.3–19 THz range and at 94 GHz has been measured and found to depend quadratically on the bunch charge. The measured radiated energy for two different collection angles is in good agreement with theory. Modeling indicates that optimization of this table-top source could provide more than 100 μJ/pulse. Together with intrinsic synchronization to the laser pulse, this will enable numerous applications requiring intense terahertz radiation. This radiation can also be used as a powerful tool for measuring the properties of laser accelerated bunches at the exit of the plasma accelerator. Preliminary spectral measurements indicates that bunches as short as 30–50 fs have been produced in these laser driven accelerators.

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Section: Introductionmentioning

confidence: 99%

Terahertz radiation from laser accelerated electron bunches

et al. 2004

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“…The use of laser plasma accelerators has been made in radioisotope production through   ,n  reactions with laser accelerated electron bunches in the range tens of MeV [92,93].…”

Section: Applications and Future Prospectsmentioning

confidence: 99%

Electromagnetic Waves and Their Application to Charged Particle Acceleration

Malik¹

2013

Wave Propagation Theories and Applications

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“…Applications of LWFA e-beams have been explored such as radio-isotope production [32,42,89,90], THz radiation generation [44,91], x-ray generation [92][93][94][95], and pump-probe experiments [96].…”

Section: Plasma Based Accelerator Experimentsmentioning

confidence: 99%

Control of Laser Plasma Based Accelerators up to 1 GeV

Nakamura

2007

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This dissertation documents the development of a broadband electron spectrometer (ESM) for GeV class Laser Wakefield Accelerators (LWFA), the production of high quality GeV electron beams (e-beams) for the first time in a LWFA by using a capillary discharge guide (CDG), and a statistical analysis of CDG-LWFAs.An ESM specialized for CDG-LWFAs with an unprecedentedly wide momentum acceptance, from 0.01 to 1.1 GeV in a single shot, has been developed. Simultaneous measurement of e-beam spectra and output laser properties as well as a large angular acceptance (> ±10 mrad) were realized by employing a slitless scheme. A scintillating screen (LANEX Fast back ,LANEX-FB) -camera system allowed faster than 1 Hz operation and evaluation of the spatial properties of e-beams. The design provided sufficient resolution for the whole range of the ESM (below 5% for beams with 2 mrad divergence).The calibration between light yield from LANEX-FB and total charge, and a study on the electron energy dependence (0.071 to 1.23 GeV) of LANEX-FB were performed at the Advanced light source (ALS), Lawrence Berkeley National Laboratory (LBNL). Using this calibration data, the developed ESM provided a charge measurement as well.The production of high quality electron beams up to 1 GeV from a centimeter-scale ii accelerator was demonstrated. The experiment used a 310 µm diameter gas-filled capillary discharge waveguide that channeled relativistically-intense laser pulses (42 TW, A statistical analysis of the CDG-LWFAs' performance was carried out. By taking advantage of the high repetition rate experimental system, several thousands of shots were taken in a broad range of the laser and plasma parameters. An analysis program was developed to sort and select the data by specified parameters, and then to evaluate performance statistically.The analysis suggested that the generation of GeV-level beams comes from a highly unstable and regime. By having the plasma density slightly above the threshold density for self injection, 1) the longest dephasing length possible was provided, which led to the generation of high energy e-beams, and 2) the number of electrons injected into the wakefield was kept small, which led to the generation of high quality (low energy spread) e-beams by minimizing the beam loading effect on the wake. The analysis of the stable half-GeV beam regime showed the requirements for stable self injection and acceleration. A small change of discharge delay t dsc , and input energy E in , significantly affected performance.The statistical analysis provided information for future optimization, and suggested possible schemes for improvment of the stability and higher quality beam generation. A CDG-LWFA is envisioned as a construction block for the next generation accelerator, enabling significant cost and size reductions.

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Production of radioactive nuclides by energetic protons generated from intense laser-plasma interactions

Cited by 141 publications

References 12 publications

Terahertz radiation from laser accelerated electron bunches

Terahertz radiation from laser accelerated electron bunches

Electromagnetic Waves and Their Application to Charged Particle Acceleration

Control of Laser Plasma Based Accelerators up to 1 GeV

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