scholarly journals CO2 laser ion source: Comparison between mode-locked and free-running laser beams

2001 ◽  
Vol 19 (4) ◽  
pp. 647-655 ◽  
Author(s):  
N. LISI ◽  
C. MEYER ◽  
R. SCRIVENS
Keyword(s):  
Laser Pulse ◽  
Hadron Collider ◽  
Ion Source ◽  
Intense Laser ◽  
Laser Ion Source ◽  
Pulse Trains ◽  
Free Running ◽  
Time Structures ◽  
First Time ◽  
Charged Ions

The production of highly charged ions in a CO2 laser-generated plasma is compared for different laser pulse-time structures. The work was performed at the CERN Laser Ion Source, which has the aim of developing a high current, high charge-state ion source for the Large Hadron Collider (LHC). When an intense laser pulse is focused onto a high-Z metal target, the ions expanding in the plasma plume are suitable for extraction from the plasma and matching into a synchrotron. For the first time, a comparison is made between free-running pulses with randomly fluctuating intensity, and mode-locked pulse trains with a reproducible structure and the same energy. Despite the lower power density with respect to the mode-locked pulse train, the free-running pulse provides higher charge states and higher yield.

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

2012 ◽  
Vol 30 (1) ◽  
pp. 65-73 ◽  
Author(s):  
N.N. Alekseev ◽  
A.N. Balabaev ◽  
A.A. Vasilyev ◽  
Yu.A. Satov ◽  
S.M. Savin ◽  
...  
Keyword(s):  
Laser Beam ◽  
Plasma Generator ◽  
Heavy Ion ◽  
Ion Source ◽  
Optical Scheme ◽  
Laser Ion Source ◽  
Active Volume ◽  
Free Running ◽  
Discharge Formation ◽  
Current Trace

AbstractThe 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 ion injector as well as the injector scheme are shown.

Grid-Controlled Extraction of Low-Charged Ions from a Laser Ion Source

2003 ◽  
Vol 42 (Part 1, No. 8) ◽  
pp. 5367-5371 ◽  
Author(s):  
Masahiro Yoshida ◽  
Jun Hasegawa ◽  
Joe W. Kwan ◽  
Yoshiyuki Oguri ◽  
Mitsuo Nakajima ◽  
...  
Keyword(s):  
Ion Source ◽  
Laser Ion Source ◽  
Charged Ions

scholarly journals X-ray spectroscopy observation of fast ions generation in plasma produced by short low-contrast laser pulse irradiation of solid targets

2007 ◽  
Vol 25 (2) ◽  
pp. 267-275 ◽  
Author(s):  
A.YA. Faenov ◽  
A.I. Magunov ◽  
T.A. Pikuz ◽  
I. YU. Skobelev ◽  
S.V. Gasilov ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Laser Intensity ◽  
Laser Pulses ◽  
Intense Laser ◽  
Low Contrast ◽  
X Ray ◽  
Fast Ions ◽  
Self Focusing ◽  
Short Laser Pulses ◽  
Charged Ions

X-ray spectra of plasma produced by the interaction of Ti:Sa laser pulses (duration from 60 fs to 1 ps, and energy from 15 mJ to 128 mJ) with foil and solid Teflon and AL targets are investigated. It is shown experimentally and theoretically that the use of low contrast (10−2 – 10−4) short laser pulses, essentially promotes the conditions for generation of fast multi-charged ions. This effect is caused by self-focusing of the main laser pulse in a preplasma produced by intense laser prepulses. Modeling of the observed spectral line shape gives evidence of a considerable (about 3%) amount of multi-charged He-like F ions with energy E ∼ 1 MeV at rather low values of laser intensity IL ≈ 6 × 1016 W cm−2.

Laser ion source torch for highly charged ions

1998 ◽  
Vol 69 (2) ◽  
pp. 1156-1157 ◽  
Author(s):  
A. V. Demyanov ◽  
S. V. Sidorov ◽  
S. A. Avdeev ◽  
B. P. Jatcenko
Keyword(s):  
Ion Source ◽  
Highly Charged Ions ◽  
Laser Ion Source ◽  
Charged Ions

scholarly journals Measurement of temperature evolution for the laser ion source plasma

2002 ◽  
Vol 20 (4) ◽  
pp. 613-615 ◽  
Author(s):  
A.E. STEPANOV ◽  
G.S. VOLKOV ◽  
V.I. ZAITSEV ◽  
K.N. MAKAROV ◽  
YU.A. SATOV ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Laser Pulse ◽  
Radiation Intensity ◽  
Temporal Evolution ◽  
Plasma Temperature ◽  
Ion Source ◽  
Laser Ion Source ◽  
X Ray ◽  
Radiation Spectra ◽  
Good Agreement

Temporal evolution of X-ray spectra of lead plasma produced by a CO2 laser pulse with energy of 100 J and a duration of 15 ns has been measured using a six-channel X-ray polychromator. The polychromator registered the radiation intensity in the range from 180 to 1850 eV. Plasma temperature was determined by comparison of measured results with radiation spectra obtained by numerical simulation. The values of electron temperature are in good agreement with results of hydro simulations.

X-RAYS EMISSION OF HYDROGEN-LIKE AND HELIUM-LIKE ARGON IN INTERACTION WITH Mo METALLIC SURFACE

2005 ◽  
Vol 19 (15n17) ◽  
pp. 2433-2437
Author(s):  
Z. H. YANG ◽  
X. M. CHEN ◽  
Y. P. ZHANG ◽  
A. X. ZHANG ◽  
Y. T. ZHAO ◽  
...  
Keyword(s):  
Electron Cyclotron Resonance ◽  
National Laboratory ◽  
Heavy Ion ◽  
Ion Source ◽  
Metallic Surface ◽  
X Rays ◽  
Research Facility ◽  
X Ray ◽  
First Time ◽  
Charged Ions

14-GHz electron cyclotron resonance ion source (ECRIS) at the Heavy Ion Research Facility National Laboratory in Lanzhou has been used to investigate the radiative deexcitation of highly charged Ar 17+ and Ar 16+ ions as they interact with a molybdenum surface. The interaction of Ar 17+ and Ar 16+ ions above Mo Metallic Surface has been studied by looking at the X-rays with a Si ( Li ) detector. ECRIS is used in our work for the first time. As the experimental results, the X-ray spectra of Ar 17+ and Ar 16+ ions interacting with a Mo metal target have been given. The capture of many electrons by Ar 17+ and Ar 16+ ions, at low velocities, near a metallic surface, has been studied. Hollow atoms produced in the interaction of highly charged ions with a Mo metallic surface have been observed.

The laser ion source of multiply charged ions

1991 ◽  
pp. 165-166 ◽  
Author(s):  
V. B. Kutner ◽  
Yu. A. Bykovski ◽  
V. P. Gusev ◽  
Yu. P. Kozyrev ◽  
V. D. Peklenkov
Keyword(s):  
Ion Source ◽  
Laser Ion Source ◽  
Multiply Charged Ions ◽  
Multiply Charged ◽  
Charged Ions

The laser ion source of multiply charged ions

1991 ◽  
Vol 21 (S1) ◽  
pp. S165-S166 ◽  
Author(s):  
V. B. Kutner ◽  
Yu. A. Bykovski ◽  
V. P. Gusev ◽  
Yu. P. Kozyrev ◽  
V. D. Peklenkov
Keyword(s):  
Ion Source ◽  
Laser Ion Source ◽  
Multiply Charged Ions ◽  
Multiply Charged ◽  
Charged Ions

scholarly journals A study of the parameters of particles ejected from a laser plasma

2004 ◽  
Vol 22 (4) ◽  
pp. 461-467 ◽  
Author(s):  
D. DORIA ◽  
A. LORUSSO ◽  
F. BELLONI ◽  
V. NASSISI ◽  
L. TORRISI ◽  
...  
Keyword(s):  
Ion Beam ◽  
Target Surface ◽  
Quantitative Information ◽  
Ion Source ◽  
Laser Ion Source ◽  
Diagnostic Systems ◽  
Degree Of Ionization ◽  
Ion Energy ◽  
Charged Ions ◽  
Deposited Film

We report on the results concerning the characteristics and the behavior of expanding plasma generated by a Laser Ion Source (LIS). The LIS technique is an efficient means in producing of multi-charged ions utilizing pulsed laser beams. In order to extract Cu ions, in this experiment an XeCl excimer UV laser was employed, providing a power density on the target surface up to 5 × 108 W/cm2. Two typologies of diagnostic systems were developed in order to detect the plasma current and the ion energy. The time-of-flight (TOF) measurements were performed exploiting either a Faraday cup or an Ion Energy Analyzer (IEA). This latter allowed getting quantitative information about the relative ion abundances, their kinetic energy and their charge state. To study the plasma characteristics we measured the total etched material per pulse at 70 mJ. It was 0.235 μg and the overall degree of ionization, 16%. The angular distribution of the ablated material was monitored by optical transmission analysis of the deposited film as a function of the angle with respect to the normal to the target surface. Applying a high voltage to an extraction gap a multi-charged ion beam was obtained; different peaks could be distinguished in the TOF spectrum, resulting from the separation of ions of hydrogen, adsorbed compounds in the target and copper.

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