Acceleration of Ta<sup>10+</sup> ions produced by laser ion source in RFQ MAXILAC

Dubenkov, V.; Sharkov, B.; Голубев, А. А.; Shumshurov, A.; Shamaev, O. B.; Roudskoy, I.; Strel'tsov, A P; Satov, Yu. A.; Makarov, K. N.; Smakovsky, Y.; Hoffmann, D. H. H.; Laux, W.; Müller, R.; Spädtke, P.; Stöckl, C.; Wolf, B. H.; Jacoby, J.

doi:10.1017/s0263034600010107

Cited by 25 publications

(10 citation statements)

References 5 publications

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“…4,5 More modern systems have been built upon the previous success and the growth in interest in heavy ion accelerators. [6][7][8][9] In parallel with new developments in Q-switched lasers, LIS systems utilizing CO 2 , excimer XeCl, femtosecond Ti:sapphire, and picosecond Nd:yttriumaluminum-garnet lasers have all been reported. 10 In this paper we shall present a thorough overview of the main components and design aspects of the DCU laser ion source.…”

Section: Introductionmentioning

confidence: 99%

The DCU laser ion source

Yeates¹,

Costello

Kennedy

2010

Review of Scientific Instruments

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Laser ion sources are used to generate and deliver highly charged ions of various masses and energies. We present details on the design and basic parameters of the DCU laser ion source ͑LIS͒. The theoretical aspects of a high voltage ͑HV͒ linear LIS are presented and the main issues surrounding laser-plasma formation, ion extraction and modeling of beam transport in relation to the operation of a LIS are detailed. A range of laser power densities ͑I ϳ 10 8 -10 11 W cm −2 ͒ and fluences ͑F = 0.1-3.9 kJ cm −2 ͒ from a Q-switched ruby laser ͑full-width half-maximum pulse duration ϳ35 ns, = 694 nm͒ were used to generate a copper plasma. In "basic operating mode," laser generated plasma ions are electrostatically accelerated using a dc HV bias ͑5-18 kV͒. A traditional einzel electrostatic lens system is utilized to transport and collimate the extracted ion beam for detection via a Faraday cup. Peak currents of up to I ϳ 600 A for Cu + to Cu 3+ ions were recorded. The maximum collected charge reached 94 pC ͑Cu 2+ ͒. Hydrodynamic simulations and ion probe diagnostics were used to study the plasma plume within the extraction gap. The system measured performance and electrodynamic simulations indicated that the use of a short field-free ͑L =48 mm͒ region results in rapid expansion of the injected ion beam in the drift tube. This severely limits the efficiency of the electrostatic lens system and consequently the sources performance. Simulations of ion beam dynamics in a "continuous einzel array" were performed and experimentally verified to counter the strong space-charge force present in the ion beam which results from plasma extraction close to the target surface. Ion beam acceleration and injection thus occur at "high pressure." In "enhanced operating mode," peak currents of 3.26 mA ͑Cu 2+ ͒ were recorded. The collected currents of more highly charged ions ͑Cu 4+ -Cu 6+ ͒ increased considerably in this mode of operation.

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Section: Introductionmentioning

confidence: 99%

The DCU laser ion source

Yeates¹,

Costello

Kennedy

2010

Review of Scientific Instruments

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“…The ions are accelerated in the plasma sheath and can be additionally accelerated by an external electric field forming an ion beam. [12][13][14] LMCI source produces ions from a small spot on the target, which gives control on the ion beam divergence and emittance. The produced MCIs can then be collimated and focused in an ion transport line.…”

Section: Introductionmentioning

confidence: 99%

Spark discharge coupled laser multicharged ion source

Shaim

Elsayed-Ali

2015

Review of Scientific Instruments

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A spark discharge is coupled to a laser multicharged ion source to enhance ion generation. The laser plasma triggers a spark discharge with electrodes located in front of the ablated target. For an aluminum target, the spark discharge results in significant enhancement in the generation of multicharged ions along with higher charge states than observed with the laser source alone. When a Nd:YAG laser pulse (wavelength 1064 nm, pulse width 7.4 ns, pulse energy 72 mJ, laser spot area on target 0.0024 cm(2)) is used, the total multicharged ions detected by a Faraday cup is 1.0 nC with charge state up to Al(3+). When the spark amplification stage is used (0.1 μF capacitor charged to 5.0 kV), the total charge measured increases by a factor of ∼9 with up to Al(6+) charge observed. Using laser pulse energy of 45 mJ, charge amplification by a factor of ∼13 was observed for a capacitor voltage of 4.5 kV. The spark discharge increases the multicharged ion generation without increasing target ablation, which solely results from the laser pulse. This allows for increased multicharged ion generation with relatively low laser energy pulses and less damage to the surface of the target.

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“…One of the main problems facing HIF is to find a source of ions having characteristics suitable for ICF [4,5]. It is well known that a laser source of ions can provide the highest intensity of multiply charged ions for injection into practically any accelerator [6,7]. For the practical use of these sources it is desirable to have high momentum without reduction in intensity and charge of ions.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Characteristics of Laser Source of Ions Using Two-Element Targets

Khaydarov¹

2006

AIP Conference Proceedings

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Two-element plasma ions generated from porous (Ho 2 O 3 ) and solid (PbMg) targets were studied depending on the target density ρ and on the fraction of light (Mg) component of the target, using a mass-spectrometer. Oxygen ions with maximal charge is observed for small values of ρ, while the heavy component of the target Ho has maximal charge for larger values of ρ. The influence of ρ to the energy spectra and intensity of plasma ions is also investigated. In the case of solid (PbMg) target the increase of the fraction of Mg leads to the widening of the energy spectra of Pb ions by more than a factor of two, while the intensity of Pb ions of all charge states does not depend on the Mg fraction. These effects are explained by the friction existing between light and heavy ions during their expansion away from the target.

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Acceleration of Ta¹⁰⁺ ions produced by laser ion source in RFQ MAXILAC

Cited by 25 publications

References 5 publications

The DCU laser ion source

The DCU laser ion source

Spark discharge coupled laser multicharged ion source

Improvement of Characteristics of Laser Source of Ions Using Two-Element Targets

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Acceleration of Ta10+ ions produced by laser ion source in RFQ MAXILAC

Cited by 25 publications

References 5 publications

The DCU laser ion source

The DCU laser ion source

Spark discharge coupled laser multicharged ion source

Improvement of Characteristics of Laser Source of Ions Using Two-Element Targets

Contact Info

Product

Resources

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Acceleration of Ta¹⁰⁺ ions produced by laser ion source in RFQ MAXILAC