scholarly journals X-ray emission of Xe30+ ion beam impacting on Au target

2011 ◽  
Vol 29 (2) ◽  
pp. 265-268 ◽  
Author(s):  
Xiaoan Zhang ◽  
Yongtao Zhao ◽  
Dieter H.H. Hoffmann ◽  
Zhihu Yang ◽  
Ximeng Chen ◽  
...  
Keyword(s):  
Solid State ◽  
Kinetic Energy ◽  
Ion Beam ◽  
Rydberg States ◽  
Heavy Ion ◽  
X Rays ◽  
Research Facility ◽  
X Ray ◽  
Charged Ions ◽  
Very High

AbstractX-ray emission from Xe30+ ions at 350–600 keV impacting on an Au target was investigated at the Heavy Ion Research Facility at Lanzhou. Characteristic X-rays of Xe ions at energy of about 1.65 keV were observed. This X-ray emission is induced by the decay of very high Rydberg states of Xe ions. It was also found that the yield of such characteristic X-rays is decreasing with increasing the projectile kinetic energy. Simultaneously, the yield of the characteristic Au X-rays from the M shell increases also. These phenomena are qualitatively analyzed with the classical Coulomb over the Barrier Mode (COBM) for highly charged ions interacting with solid state surfaces.

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 Effects of Heavy Ion Particles on Human Megakaryocytopoiesis and Thrombopoiesis.

Blood ◽  
2006 ◽  
Vol 108 (11) ◽  
pp. 4156-4156
Author(s):  
Ikuo Kashiwakura ◽  
Kenji Takahashi ◽  
Satoru Monzen ◽  
Kiyomi Eguchi-Kasai ◽  
Tsutomu Toki ◽  
...  
Keyword(s):  
Flow Cytometry ◽  
Ion Beam ◽  
Heavy Ion ◽  
X Rays ◽  
Dna Double Strand Breaks ◽  
Nuclear Facilities ◽  
Plasma Clot ◽  
Carbon Ion ◽  
X Ray ◽  
Carbon Ion Beam

Abstract Heavy ion particles provide unique properties in radiotherapy. However, they have also been shown to pose high risks for both work at nuclear facilities and astronauts participating in space missions. In a previous study, we demonstrated that in radio-sensitive megakaryocyte progenitor cells, namely colony-forming unit megakaryocytes (CFU-Meg), a degree of X-ray-induced damage was prevented by post-treatment with several cytokines. In this study, we analyzed the effects of heavy ion particles on megakaryocytopoiesis and thrombopoiesis. The CD34+ CFU-Meg were isolated from human placental and umbilical cord blood using a magnetic isolation kit and then were exposed to a carbon ion beam (LET=50 KeV/mm). They were cultured in a serum free medium supplemented with a thrombopoietin (TPO) alone or a combination of TPO plus other cytokines including stem cell factor, interleukin-3 (IL-3) and Flt3-ligand. The number of CFU-Meg was calculated by a plasma clot technique. The differentiation into megakaryocytes (CD41+) and the release of platelets (CD42a+) in a liquid culture were both analyzed by flow cytometry. The increase of gamma-H2AX, a marker of DNA double-strand breaks (DSBs) was also detected by flow cytometry. The sensitivity of CFU-Meg to a carbon ion beam was found to be extremely high and could not be lowered by any type of cytokines unlike X-rays. However, treatment with TPO plus IL-3 potentially induced megakaryocytopoiesis and thrombopoiesis at 14 days after the exposure to a carbon ion beam at 2 Gy. The cytokine treatment enhanced the induction of gamma-H2AX in X-ray-irradiated CD34+ CFU-Meg but not in a carbon ion beam-irradiated one. These results show that not only the downregulation of death signals, but also the repair of DSBs was less strongly promoted by cytokines in CFU-Meg exposed to a carbon ion beam than X-rays. Different treatments therefore are required to protect against megakaryocytopoiesis and thrombopoiesis damage by heavy ion particles.

The Dipole Magnets Temperature Monitoring and Interlocking Protection System of HIRFL-CSRm

2015 ◽  
Vol 789-790 ◽  
pp. 1078-1081 ◽  
Author(s):  
Jia Yin ◽  
Li Li Li ◽  
Yan Yu Wang
Keyword(s):  
Storage Ring ◽  
Ion Beam ◽  
Economic Loss ◽  
Heavy Ion ◽  
High Energy ◽  
Temperature Monitoring ◽  
Low Energy ◽  
Protection System ◽  
Research Facility ◽  
Very High

HIRFL-CSRm is a heavy ion synchrotron, named the main Cooling Storage Ring of Heavy Ion Research Facility of Lanzhou. Its role is to cool and accumulate the injected low energy ion beam, and then accelerate to high energy and extract. So, requirements for performance and safety of the magnet which directly affect the intensity and stability of ion beam is very high. This paper mainly state temperature monitoring and interlocking protection for the dipole magnets of HIRFL-CSRm to protect magnets, reduce the economic loss, and ultimately ensure safe running of HIRFL.

THRESHOLD KINETIC ENERGY FOR GOLD X-RAY EMISSION INDUCED BY HIGHLY CHARGED IONS

2005 ◽  
Vol 19 (15n17) ◽  
pp. 2486-2490 ◽  
Author(s):  
Y. T. ZHAO ◽  
G. Q. XIAO ◽  
X. A. ZHANG ◽  
Z. H. YANG ◽  
Y. P. ZHANG ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Gold Surface ◽  
Highly Charged Ions ◽  
X Rays ◽  
X Ray ◽  
Argon Ions ◽  
Charged Ions

The X-rays induced in the interaction of highly charged Argon ions with gold surface were investigated. We had altered the projectile kinetic energy from 150keV to about 400keV. The results show that, there is a threshold projectile kinetic energy for this excitation. Combining the colliding theory of classic electrodynamics with the concept of quantized orbits, we crudely give this threshold kinetic energy.

scholarly journals Microcalorimeters for X-Ray Spectroscopy of Highly Charged Ions at Storage Rings

Atoms ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 59 ◽  
Author(s):  
Saskia Kraft-Bermuth ◽  
Daniel Hengstler ◽  
Peter Egelhof ◽  
Christian Enss ◽  
Andreas Fleischmann ◽  
...  
Keyword(s):  
Heavy Ions ◽  
Lamb Shift ◽  
Ion Beam ◽  
Heavy Ion ◽  
Storage Rings ◽  
Highly Charged Ions ◽  
Semiconductor Detectors ◽  
X Ray ◽  
Charged Ions

X-ray spectroscopy of highly charged heavy ions is an important tool for the investigation of many topics in atomic physics. Such highly charged ions, in particular hydrogen-like uranium, are investigated at heavy ion storage rings, where high charge states can be produced in large quantities, stored for long times and cooled to low momentum spread of the ion beam. One prominent example is the determination of the 1s Lamb Shift in hydrogen-like heavy ions, which has been investigated at the Experimental Storage Ring (ESR) at the GSI Helmholtz Centre for Heavy Ion Research. Due to the large electron binding energies, the energies of the corresponding photon transitions are located in the X-ray regime. To determine the transition energies with high accuracy, highly resolving X-ray spectrometers are needed. One concept of such spectrometers is the concept of microcalorimeters, which, in contrast to semiconductor detectors, uses the detection of heat rather than charge to detect energy. Such detectors have been developed and successfully applied in experiments at the ESR. For experiments at the Facility for Antiproton and Ion Research (FAIR), the Stored Particles and Atoms Collaboration (SPARC) pursues the development of new microcalorimeter concepts and larger detector arrays. Next to fundamental investigations on quantum electrodynamics such as the 1s Lamb Shift or electron–electron interactions in two- and three-electron systems, X-ray spectroscopy may be extended towards nuclear physics investigations like the determination of nuclear charge radii.

The Basic Physical Principles of Ion, Electron, and X-Ray Detectors and Their Application to Microanalysis

1985 ◽  
Vol 43 ◽  
pp. 154-157
Author(s):  
A.J. Tousimis
Keyword(s):  
Ion Beam ◽  
Depth Resolution ◽  
Sample Surface ◽  
High Energy ◽  
X Rays ◽  
X Ray ◽  
Electrons And Ions ◽  
Spatial Depth ◽  
Minimum Surface Area ◽  
Physical Principles

An integral and of prime importance of any microtopography and microanalysis instrument system is its electron, x-ray and ion detector(s). The resolution and sensitivity of the electron microscope (TEM, SEM, STEM) and microanalyzers (SIMS and electron probe x-ray microanalyzers) are closely related to those of the sensing and recording devices incorporated with them.Table I lists characteristic sensitivities, minimum surface area and depth analyzed by various methods. Smaller ion, electron and x-ray beam diameters than those listed, are possible with currently available electromagnetic or electrostatic columns. Therefore, improvements in sensitivity and spatial/depth resolution of microanalysis will follow that of the detectors. In most of these methods, the sample surface is subjected to a stationary, line or raster scanning photon, electron or ion beam. The resultant radiation: photons (low energy) or high energy (x-rays), electrons and ions are detected and analyzed.

scholarly journals Proton therapy for craniopharyngioma in adults: a protocol for systematic review and meta-analysis

BMJ Open ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. e046043
Author(s):  
Pengtao Li ◽  
Jialing Wang ◽  
Aximujiang Axier ◽  
Kai Zhou ◽  
Jingwei Yun ◽  
...  
Keyword(s):  
Proton Therapy ◽  
Ion Beam ◽  
Grey Literature ◽  
Intervention Group ◽  
Heavy Ion ◽  
Cochrane Library ◽  
Secondary Outcome ◽  
Significant Heterogeneity ◽  
Recurrence Rates ◽  
X Ray

IntroductionCraniopharyngioma is the most challenging to treat brain tumour with high recurrence rates, which can be effectively reduced by adjuvant radiotherapy. In recent years, proton therapy (PT), with its physical properties of heavy ion beam, that is, Prague peak phenomenon, has been more frequently used in patients with craniopharyngioma. Compared with conventional X-ray beam radiotherapy, PT can reduce the damage to normal tissues and enlarge the damage to tumours. Some studies have shown that PT has advantages in the treatment of craniopharyngioma in adults. However, the optimal management of craniopharyngioma remains controversial. The purpose of this study was to evaluate the efficacy and safety of PT for craniopharyngioma in adults.Methods and analysisWe will search six databases (MEDLINE, EMBASE, Web of Science, the Cochrane Library, Amed, Scopus), clinical research registration websites and grey literature, aiming to identify randomised controlled trials (RCTs) on PT for craniopharyngioma in adults between 1 January 1954 and 28 September 2021. In the RCTs, PT will be used as the intervention group, and conventional X-ray beam radiotherapy will be used as the comparator group. Tumour recurrence and survival will be the primary outcome, and treatment-related toxicity will be the secondary outcome. The study selection, data extraction, bias risk and quality evaluation will be operated by two to four researchers independently. We will use Review Manager V.5.2 (RevMan V.5.2) for data analysis. If there is significant heterogeneity, we will identify the source of heterogeneity by subgroup analysis.Ethics and disseminationOur study is based on existing RCTs and does not require ethical approval. The results of the study will be published in a peer-reviewed journal or at a related conference.PROSPERO registration numberCRD42020200909.

Radiation Production Using Femtosecond Electron Bunches

2005 ◽  
Vol 107 ◽  
pp. 11-14
Author(s):  
C. Thongbai ◽  
V. Jinamoon ◽  
N. Kangrang ◽  
K. Kusoljariyakul ◽  
S. Rimjaem ◽  
...  
Keyword(s):  
Far Infrared ◽  
Bunch Length ◽  
X Rays ◽  
Research Facility ◽  
X Ray ◽  
Electron Bunches ◽  
Rf Gun ◽  
Intense Radiation ◽  
Far Infrared Radiation ◽  
Femtosecond Electron Bunches

Femtosecond electron bunches can be generated from a system consisting of an RF gun with a thermionic cathode, an alpha magnet, and a linear accelerator and can be used to produce femtosecond (fs) electromagnetic radiation pulses. At the Fast Neutron Research Facility (FNRF), Thailand, we are especially interested in production in Far-infrared (FIR) and x-radiation. In the far-infrared, radiation is emitted coherently for wavelengths which are longer than the electron bunch length, yielding intense radiation. Although, the x-rays emitted are incoherent, its femtosecond time scale is crucial for development of a femtosecond x-ray source.

scholarly journals A New Chapter in Hard X-rays of the M87 AGN

Proceedings ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 9
Author(s):  
Ka-Wah Wong ◽  
Rodrigo S. Nemmen ◽  
Jimmy A. Irwin ◽  
Dacheng Lin
Keyword(s):  
High Energy ◽  
X Rays ◽  
X Ray ◽  
Accretion Flow ◽  
Relativistic Jet ◽  
Very High Energy ◽  
Γ Ray ◽  
High Energy Emission ◽  
First Time ◽  
Very High

The nearby M87 hosts an exceptional relativistic jet. It has been regularly monitored in radio to TeV bands, but little has been done in hard X-rays ≳10 keV. For the first time, we have successfully detected hard X-rays up to 40 keV from its X-ray core with joint Chandra and NuSTAR observations, providing important insights to the X-ray origins: from the unresolved jet or the accretion flow. We found that the hard X-ray emission is significantly lower than that predicted by synchrotron self-Compton models introduced to explain very-high-energy γ -ray emission above a GeV. We discuss recent models to understand these high energy emission processes.

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