New Developments of a Laser Ion Source for Ion Synchrotrons (original) (raw)
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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.
CERN PS laser ion source development
Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366), 1999
CERN, together with ITEP and TRINITI (Russia), is developing a CO 2 laser ion source. The key design parameters are: 1.4×10 10 ions of Pb 25+ in a pulse of 5.5 µs, with a 4-rms emittance of 0.2×10 -6 rad m, working at a repetition rate of 1 Hz. This device is considered as one candidate source for LHC heavy ion operation. The status of the laser development, the experimental set-up of the source consisting of the target area and its illumination, the plasma expansion area and extraction, beam transport and ion pre-acceleration by an RFQ, will be given.
Status of the CO2 laser ion source at CERN
Review of Scientific Instruments, 2000
A laser ion source using a CO 2 laser focused onto a solid target is under study at CERN for the production of high currents of highly-charged heavy ions, for possible use in the pre-injector for LHC. A new expansion and extraction layout was installed in this test facility, improving the alignment and making the target to extraction distance more flexible. A two solenoid beam transport system was studied for providing the matching of the beam to an RFQ. An electrostatic beam transport using gridded electrostatic lenses was designed and constructed as an alternative to a magnetic system. Results show an increased overall current transmission for the electrostatic case. Investigation of the laser parameters required for the production of 1.4x10 10 Pb 25+ ions in a 5 µs pulse, has been performed using the TIR-1 laser facility at power densities up to 10 14 Wcm -2 for a focal spot size of 65 µm. The results of the latest scaling are presented.
Status of the CO[sub 2] laser ion source at CERN
Review of Scientific Instruments, 2000
A laser ion source using a CO 2 laser focused onto a solid target is under study at CERN for the production of high currents of highly-charged heavy ions, for possible use in the pre-injector for LHC. A new expansion and extraction layout was installed in this test facility, improving the alignment and making the target to extraction distance more flexible. A two solenoid beam transport system was studied for providing the matching of the beam to an RFQ. An electrostatic beam transport using gridded electrostatic lenses was designed and constructed as an alternative to a magnetic system. Results show an increased overall current transmission for the electrostatic case. Investigation of the laser parameters required for the production of 1.4x10 10 Pb 25+ ions in a 5 µs pulse, has been performed using the TIR-1 laser facility at power densities up to 10 14 Wcm -2 for a focal spot size of 65 µm. The results of the latest scaling are presented.
Review of Scientific Instruments, 2016
A laser ion source based on Nd:YAG laser has been being studied at the Institute of Modern Physics for the production of high intensity high charge state heavy ion beams in the past ten years, for possible applications both in a future accelerator complex and in heavy ion cancer therapy facilities. Based on the previous results for the production of multiple-charged ions from a wide range of heavy elements with a 3 J/8 ns Nd:YAG laser [Zhao et al., Rev. Sci. Instrum. 85, 02B910 (2014)], higher laser energy and intensity in the focal spot are necessary for the production of highly charged ions from the elements heavier than aluminum. Therefore, the laser ion source was upgraded with a new Nd:YAG laser, the maximum energy of which is 8 J and the pulse duration can be adjusted from 8 to 18 ns. Since then, the charge state distributions of ions from various elements generated by the 8 J Nd:YAG laser were investigated for different experimental conditions, such as laser energy, pulse duration, power density in the focal spot, and incidence angle. It was shown that the incidence angle is one of the most important parameters for the production of highly charged ions. The capability of producing highly charged ions from the elements lighter than silver was demonstrated with the incidence angle of 10 • and laser power density of 8 × 10 13 W cm −2 in the focal spot, which makes a laser ion source complementary to the superconducting electron cyclotron resonance ion source for the future accelerator complex especially in terms of the ion beam production from some refractory elements. Nevertheless, great efforts with regard to the extraction of intense ion beams, modification of the ion beam pulse duration, and reliability of the ion source still need to be made for practical applications.
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 ...
HIGH CHARGE-STATE ION BEAM PRODUCTION FROM A LASER ION SOURCE
2000
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 such a source is studied. A 60 mA pulse of a mixture of high charge state tantalum or lead ions of 5 μs duration
Perspectives in High Intensity Heavy Ion Sources for Future Heavy Ion Accelerators
2018
Driven by the development of next generation heavy ion accelerators such as IMP-HIAF, GSI-FAIR, RIKEN-RIBF, SPIRAL 2, JLEIC and so on that need very intense highly charged heavy ion beam injectors working at either pulsed or CW modes, intense research and development work towards more powerful ion sources have been made in different laboratories, which likewise has stimulated obvious advancement of the performances in recent years. However, even the best performing ion sources can't meet all the requirements. While the ion source researchers are tackling the next generation ion sources development, it is worth investigating the possibilities of other solutions, especially when very intense heavy ion beams are needed for the more intense and powerful heavy ion accelerators, for instance the driver accelerator to study inertial confinement fusion with heavy ion. This invited talk presents recent advancements of highly charged heavy ion sources, and discusses the other possible app...
Heavy ion injector for the CERN Linac 1
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1987
An injector system has been constructed to provide heavy ion beams for the CERN accelerators. In the initttal step, an ECR (electron cyclotron resonance) source produces an 06+ ion beam, which is accelerated in an RFQ (radiofrequency quadrupole) structure from 5.6 keV/u to 139.5 keV/u. The specifications of this preaccelerator are described and results of test measurements at GSI are presented, as well as first experience at CERN. Oxygen ions have been accelerated in the CERN machines to 200 GeV/u. An upgrading program for the acceleration of sulphur or calcium is presented.