Development of Injector for Itep Heavy Ion Sinchrotron Based on Laser Plasma Generator (original) (raw)

Development of laser-plasma generator for injector of C4+ ions

Laser and Particle Beams, 2012

The results of the development of the ITEP accelerator carbon ion injector based on a repetition-rate CO2 laser ion source are described. The improvement includes a modified pulsed HV-feeding generator for the discharge formation in the laser gas mixture. The advanced discharge module ensures essential increase of the laser active volume and specific electrical deposition energy. The comparative computer simulations of the discharge characteristics for the improved and the prototype lasers are applied. The design and the output spatial-temporal parameters of the free-running laser “Malish-M” are shown, so the significant increase of the laser power is reached. The spatial characteristics of the laser beam obtained with diffraction calculations are compared to measured radial distribution of the energy density. The target laser intensity and the different channels of the energy loss of the laser beam in the optical scheme are estimated. Finally, the output C4+ current trace of heavy ...

Characteristics of Laser-Plasma Ion Source Based on a CO2-Laser for Heavy Ion Accelerators at ITEP

2018

The design of laser-plasma heavy ion source is described. This ions source is supposed to operate at I-3 and I-4 accelerators at ITEP. Characteristics of ion component of plasma produced by pulses of the CO2 laser were studied, when irradiating a solid carbon target at power density of 10¹¹-10¹² W/cm². Time-of-flight technique using a high-resolution electrostatic energy analyzer was applied to explore charge state and energy distribution as well as partial currents of carbon and tungsten ions. Some results of investigation of influence of cavern formation on charge state of generated ions are presented. This work is of considerable interest in a wide area of applications of accelerated particle beams, including fundamental studies of state of matter in particle colliders (NICA project at JINR), radiation damage simulation and hadron therapy for cancer treatment. The goal of this work is to investigate characteristics of ions in expanding laser plasma and find optimal conditions of ...

Ultrahigh-intensity laser-produced plasmas as a compact heavy ion injection source

IEEE Transactions on Plasma Science, 2000

The possibility of using high-intensity laser-produced plasmas as a source of energetic ions for heavy ion accelerators is addressed. Experiments have shown that neon ions greater than 6 MeV can be produced from gas jet plasmas, and well-collimated proton beams greater than 20 MeV have been produced from highintensity laser solid interactions. The proton beams from the back of thin targets appear to be more collimated and reproducible than are high-energy ions generated in the ablated plasma at the front of the target and may be more suitable for ion injection applications. Lead ions have been produced at energies up to 430 MeV.

New Developments of a Laser Ion Source for Ion Synchrotrons

Laser Ion Sources (LIS) are well suited to filling synchrotron rings with highly charged ions of almost any element in a single turn injection mode. We report the first measurements of the LIS output parameters for Pb 27+ ions generated by the new 100 J/1 Hz Master Oscillator – Power Amplifier CO 2 -laser system. A new LIS has been designed, built and tested at CERN, as an ion source for ITEP-TWAC accelerator/accumulator facility, and as a possible future source for an upgrade of the Large Hadron Collider (LHC) injector chain. The use of the LIS based on 100 J/1 Hz CO 2 -laser together with the new ion LINAC, as injector for ITEP-TWAC project, is discussed.

Laser produced plasma as an ion source for heavy ion inertial fusion

Laser and Particle Beams, 1984

The present paper presents experimental results of the transverse and longitudinal phase volume for the expanding multicharged ions in laser produced plasma, created by focusing a CO2-laser (beam) onto a Pb207 target. The total number of Pb207 ions (with Z = 1 or 2 and Z = 6), the ion current duration and amplitude at a distance of 1 m from the laser target within 10−2 steradians are determined. The measured experimental parameters of the laser heavy ion source are compared with the driver requirement for the heavy ion inertial fusion (HIIF) programme.The phenomena observed in the experiment confirm the results of numerical calculations using a two temperature hydrodynamic programme.

High current ion sources and injectors for induction linacs in heavy ion fusion

IEEE Transactions on Plasma Science, 2005

Heavy ion beam driven inertial fusion requires short ion beam pulses with high current and high brightness. Depending on the beam current and the number of beams in the driver system, the injector can use a large diameter surface ionization source or merge an array of small beamlets from a plasma source. In this paper, we review the scaling laws that govern the injector design and the various ion source options including the contact ionizer, the aluminosilicate source, the multicusp plasma source, and the MEVVA source.

Upgrade of Heavy Ion Injector I-3 at ITEP

2019

Heavy ion injector I-3 represents two-gap 2.5 MHz resonator with accelerating voltage 2x2 MV. It‘s used with laser ion source (LIS) for acceleration of ions in wide range of charge to mass ratio. As a result of modernization, injector structure will be supplemented by the second two-gap resonator, RF voltage will be increased to 3x4 MV and accelerated beam structure has to be improved by increasing accelerating frequency to 5 MHz. Design features of upgraded linac I-3M and peculiarity of beam dynamics for different types of ions are presented.

Heavy ion fusion injector program

Proceedings of International Conference on Particle Accelerators, 1993

A program is underway to construct a 2 MV, 800 mA, K+ injector for heavy ion fusion. The Electrostatic Quadrupole (ESQ) injector configuration consists of a zeolite source, a diode of up to 1 MV, together with several electrostatic quadrupole units to simultaneously focus and accelerate the beam to 2 MV. The key issues of source technology, high voltage breakdown, beam aberrations, and transient effects will be discussed. Results from ongoing experiments and simulations will be presented.

Highly charged heavy ion generation by pulsed laser irradiation

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2003

At the Laboratorio Nazionale del Sud of the National Institute of Nuclear Physics (INFN-LNS) of Catania, different ion sources of multi-charged ions are available, including electron cyclotron resonance ion sources (ECRIS) and a laser ion source, based on a high energy infra-red pulsed laser working in single shot or pulsed mode with repetition rate of 30 Hz. A hybrid ion source based on laser source (Nd:Yag pulsed laser at 10 10 W/cm 2 ) coupled to ECRIS is under construction to generate intense heavy ion beams at very high charge states. This source will use the ECR plasma to enhance the ion charge state from 5 þ -10 þ to about 30 þ -40 þ . The description of this equipment will be shown along with some results of the preliminary experiments. Additional studies were carried out at Prague Asterix Laser Source (PALS) by means of a iodine pulsed laser at 10 15 W/cm 2 , which produces a high density-high temperature plasma. The description of the ablation effects of metals and the study of the film deposition on different substrates will be presented. Preliminary investigations on heavy ions implantation will be also outlined.

Developments at the CERN laser ion source

Review of Scientific Instruments, 1998

The high current, high charge-state ion beam which can be extracted from a laser produced plasma is well suited, after initial acceleration, for injection into synchrotrons. At CERN, the production of a heavy ion beam using a CO 2 laser ion source is studied. The latest results of experiments with a tantalum ion beam with charge states up to 23ϩ and accelerated by a radio frequency quadrupole from 6.9 to 100 keV/u, are presented along with simulations of the low energy beam transport. The ion yield at the desired charge state, the pulse to pulse stability of the ion beam, and the system reliability are all of major interest. Work is under way to replace the low repetition rate free-running laser oscillator by a master oscillator and power amplifier system. The master oscillator is operational and the first results of measurements of its beam quality and stability are presented.