LASER PULSE CIRCULATION SYSTEM FOR COMPACT MONOCHROMATIC TUNABLE HARD X-RAY SOURCE

2007 ◽  
Vol 22 (23) ◽  
pp. 4324-4332
Author(s):  
HARUYUKI OGINO ◽  
MENG DE ◽  
TOMOHIKO YAMAMOTO ◽  
FUMITO SAKAMOTO ◽  
KATSUHIRO DOBASHI ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Circulation System ◽  
X Rays ◽  
Electron Linear Accelerator ◽  
Yag Laser ◽  
X Ray ◽  
X Band ◽  
Rf Pulse ◽  
Under Construction ◽  
The University

We are construcing a laser electron Compton scattering monochromatic tunable hard X-ray source. It consists of the X-band (11.424 GHz) electron linear accelerator and Q-switch Nd : YAG laser. This work is a part of the JST (Japan Science and Technology Agency) project. The whole system is a part of the national project on the advanced compact medical accelerator development, hosted by NIRS (National Institute for Radiological Science). The University of Tokyo and KEK are working for the X-ray source. Main advantage of this X-ray source is monochromatic tunable hard X-rays (10-50keV) with the intensities of 108-109 photons/s. The table-top size X-ray source can generate dual energy monochromatic hard X-ray by turns and it takes about 40ms to chage the X-ray energy. It is calculated that the X-ray intensity is 107 photons/RF-pulse (108 photons/s in 10 pps) by the 35MeV electron and YAG laser (2J/pulse). The X-band beam line for the demonstration is under construction. We designed a laser pulse circulation system to increase the X-ray yield 10 times higer (up to 108 photons/RF-pulse, 109 photons/s). It can be proved that the laser total energy increases 10 times higher by the principle experiment with the lower energy laser (25mJ/pulse).

MULTI-BEAM COMPTON SCATTERING MONOCHROMATIC TUNABLE HARD X-RAY SOURCE

2007 ◽  
Vol 21 (03n04) ◽  
pp. 559-571 ◽  
Author(s):  
MITSURU UESAKA ◽  
FUMITO SAKAMOTO ◽  
ATSUSHI FUKASAWA ◽  
HARUYUKI OGINO ◽  
TOMOHIKO YAMAMOTO ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Compton Scattering ◽  
Optical Switch ◽  
Professional School ◽  
Circulation System ◽  
X Rays ◽  
Electron Linear Accelerator ◽  
Yag Laser ◽  
X Ray ◽  
X Band

Compton scattering hard X-ray source which consists of an X-band (11.424 GHz) electron linear accelerator and YAG laser is under construction at Nuclear Professional School, the University of Tokyo (UTNS). Monochromatic hard X-rays are required for variety of medical and biological applications. Our scheme of the hard X-ray source is to produce a monochromatic hard X-ray via collision between 35 MeV electron beam and 2.5 J/10 nsec Nd : YAG laser. In order to increase the efficiency of the X-ray yield, we adopt a laser pulse circulation system. In our case, the laser pulse circulation system can increase the X-ray intensity of up to 50 times. Main features of our scheme are to produce monochromatic tunable hard (10-40 keV) X-rays with the intensities of 108-109 photons/sec. In addition, X-ray energy can be changed with rapidly by 40 ms by introducing two different wavelength lasers (YAG fundamental (1064 nm), 2nd harmonic (532 nm)) and optical switch. This quick energy change is indispensable to living specimens and very difficult by a large SR light source and others. We designed a laser pulse circulation system to increase the X-ray yield 10 times higher (up to 108 photons/RF pulse, 109 photons/sec). It can be proved that the laser total increases 10 times higher by principle experiment with lower energy laser (25 mJ/pulse). Dual-energy X-ray CT and subtraction X-ray CT are available to determine 3D distribution of atomicc number density and electron density, and specified atomic distribution, respectively. Here, the construction status of the X-band beam line and the application plan of the hard X-ray will be reported.

MEDICAL APPLICATION OF MULTI-BEAM COMPTON SCATTERING MONOCHROMATIC TUNABLE HARD X-RAY SOURCE

2007 ◽  
Vol 22 (22) ◽  
pp. 3988-3999
Author(s):  
Mitsuru Uesaka ◽  
Katsuhiro Dobashi ◽  
Fumito Sakamoto ◽  
Atsushi Fukasawa ◽  
Haruyuki Ogino ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Compton Scattering ◽  
Optical Switch ◽  
Medical Application ◽  
Professional School ◽  
Circulation System ◽  
X Rays ◽  
Electron Linear Accelerator ◽  
X Ray ◽  
X Band

Compton scattering hard X-ray source which consists of an X-band (11.424 GHz) electron linear accelerator and YAG laser is under construction at Nuclear Professional School, the University of Tokyo. Monochromatic hard X-rays are required for variety of medical and biological applications. Our scheme of the hard X-ray source is to produce a monochromatic hard X-ray via collision between 35 MeV electron beam and 2.5 J/10 nsec Nd:YAG laser. In order to increase the efficiency of the X-ray yield, we adopt a laser pulse circulation system. In our case, the laser pulse circulation system can increase the X-ray intensity of up to 10 times. Main features of our scheme are to produce monochromatic tunable hard (10-40 keV) X-rays with the intensities of 108-109 photons/sec. In addition, X-ray energy can be changed with rapidly by 40 ms by introducing two different wavelength lasers (YAG fundamental (1064 nm), 2nd harmonic (532 nm)) and optical switch. This quick energy change is indispensable to living specimens and very difficult by a large SR light source and others. Dual-energy X-ray CT and subtraction X-ray CT are available to determine 3D distribution of atomic number density and electron density, and specified atomic distribution, respectively. Here, the construction status of the X-band beam line and the application plan of the hard X-ray are described and discussed.

The Canadian Light Source — History and scientific prospects

2004 ◽  
Vol 82 (6) ◽  
pp. 1028-1042 ◽  
Author(s):  
G M Bancroft
Keyword(s):  
Light Source ◽  
X Rays ◽  
X Ray ◽  
The Third ◽  
Scientific Disciplines ◽  
The World ◽  
History Of ◽  
Synchrotron Light ◽  
Under Construction ◽  
The University

The Canadian Light Source (CLS) in Saskatoon has been under construction for the last 4 years, and will be producing a number of very intense beams of far-IR, IR, soft and hard X-rays in 2004 for use by several hundred Canadian scientists in chemistry, surface and material science, and a host of other scientific disciplines. The CLS will dramatically enhance the Canadian spectroscopic tradition that Gerhard Herzberg help create. I begin this article (from my 2002 CIC Montreal Medal lecture) with an overview of the history of SR in Canada, beginning in 1972 with the first Canadian synchrotron workshop organized at the University of Western Ontario by Bill McGowan, and attended by Dr. Herzberg. The CLS facility is then described, along with the properties of the first and second set of beamlines to be built at the CLS. These SR beams, in the IR and X-ray regions from the third generation CSL ring, will be competitive in brightness and intensity with the best beamlines in the world for most applications. Finally, some of the present Canadian SR research at foreign SR sources is described across the entire SR spectrum. All known spectroscopic and diffraction experiments are dramatically enhanced with SR; and SR opens up new areas of spectroscopy, microscopy, and spectromicroscopy that cannot be studied with any other source of radiation.Key words: synchrotron light, X-rays, infrared, spectroscopy.

Monochromatic tunable Compton scattering X-ray source using X-band multi-bunch linac and YAG laser circulation system

2007 ◽  
Vol 261 (1-2) ◽  
pp. 867-870 ◽  
Author(s):  
Mitsuru Uesaka ◽  
Fumito Sakamoto ◽  
Katsuhiro Dobashi ◽  
Tatsuo Kaneyasu ◽  
Tomohiko Yamamoto ◽  
...  
Keyword(s):  
Compton Scattering ◽  
Circulation System ◽  
Yag Laser ◽  
X Ray ◽  
X Band

Development of Standard X-Ray Beams for Calibration of Radiobiology Cabinet and Conformal Irradiators

2021 ◽  
Author(s):  
Emily J. King ◽  
Natalie N. Viscariello ◽  
Larry A. DeWerd
Keyword(s):  
Monte Carlo Code ◽  
X Rays ◽  
Energy Agency ◽  
X Ray ◽  
Measurement Models ◽  
Dose Determination ◽  
University Of Wisconsin ◽  
Free Air ◽  
Accurate Dose ◽  
The University

This work seeks to develop standard X-ray beams that are matched to radiobiology X-ray irradiators. The calibration of detectors used for dose determination of these irradiators is performed with a set of standard X rays that are more heavily filtered and/or lower energy, which leads to a higher uncertainty in the dose measurement. Models of the XRad320, SARRP, and the X-ray tube at the University of Wisconsin Medical Radiation Research Center (UWMRRC) were created using the BEAMnrc user code of the EGSnrc Monte Carlo code system. These models were validated against measurements, and the resultant modeled spectra were used to determine the amount of added filtration needed to match the X-ray beams at the UWMRRC to those of the XRad320 and SARRP. The depth profiles and half-value layer (HVL) simulations performed using BEAMnrc agreed to measurements within 3% and 3.6%, respectively. A primary measurement device, a free-air chamber, was developed to measure air kerma in the medium energy range of X rays. The resultant spectra of the matched beams had HVL's that matched the HVL's of the radiobiology irradiators well within the 3% criteria recommended by the International Atomic Energy Agency (IAEA) and the average energies agreed within 2.4%. In conclusion, three standard X-ray beams were developed at the UWMRRC with spectra that more closely match the spectra of the XRad320 and SARRP radiobiology irradiators, which will aid in a more accurate dose determination during calibration of these irradiators.

Construction of the JAERI soft X-ray beamline for actinide material sciences

1998 ◽  
Vol 5 (3) ◽  
pp. 536-538 ◽  
Author(s):  
Takeshi Nakatani ◽  
Yuji Saitoh ◽  
Yuden Teraoka ◽  
Tetsuo Okane ◽  
Akinari Yokoya
Keyword(s):  
Photochemical Reactions ◽  
Resolving Power ◽  
Photoemission Spectroscopy ◽  
X Rays ◽  
Radioactive Materials ◽  
X Ray ◽  
Line Spacing ◽  
Material Sciences ◽  
Spectroscopy Studies ◽  
Under Construction

An undulator beamline for spectroscopy studies focusing on the electronic structure of actinide materials is under construction. Linearly or circularly polarized soft X-rays are provided by employing a variably polarizing undulator. Varied-line-spacing plane gratings and a sagittal-focusing system are used to monochromatize the undulator beam, whose energy ranges from 0.3 to 1.5 keV. A resolving power of 104 is expected in the whole energy region. These components are methodically operated by the SPring-8 beamline control system. There are three experimental stations in the beamline. In one of the stations the photoemission spectroscopy experiments are carried out at a radioisotope-controlled area where actinide compounds as well as unsealed radioactive materials are usable. Other experimental stations are planned in the beamline for surface photochemical reactions and biological applications.

scholarly journals PROTON-INDUCED X-RAY ANALYSIS OF TRACE ELEMENTS IN TISSUE SECTIONS

1974 ◽  
Vol 22 (1) ◽  
pp. 1-6 ◽  
Author(s):  
F. C. JUNDT ◽  
K. H. PURSER ◽  
H. KUBO ◽  
E. A. SCHENK
Keyword(s):  
Trace Elements ◽  
X Rays ◽  
X Ray ◽  
Tissue Sections ◽  
Formalin Fixed Paraffin ◽  
Formalin Fixed Paraffin Embedded ◽  
Tissue Homogenates ◽  
Autopsy Specimens ◽  
The University ◽  
Structure Research

A 3-meV proton beam from the MP Van de Graaff accelerator at the Nuclear Structure Research Laboratory of the University of Rochester has been used to induce characteristic x-rays of trace elements from a variety of biologic samples. The x-ray spectra have been measured with a high resolution Si(Li) detector which can detect and separate in energy x-rays from neighboring elements with Z > 13. Tissue homogenates, frozen sections and formalin-fixed, paraffin-embedded sections of various tissues obtained from surgical and autopsy specimens have been analyzed. Measurements have been made to check the sensitivity and reproducibility of the method. Data accumulated thus far indicate that this method is useful in evaluating absolute concentration of elements usually present in a given tissue and detecting environmental elements which may have accumulated in a given tissue.

scholarly journals Scaling of Beam Collective Effects with Bunch Charge in the CompactLight Free-Electron Laser

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 125
Author(s):  
Simone Di Mitri ◽  
Andrea Latina ◽  
Marcus Aicheler ◽  
Avni Aksoy ◽  
David Alesini ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Recent Literature ◽  
Collective Effects ◽  
X Rays ◽  
X Ray ◽  
Coherent Synchrotron Radiation ◽  
X Band ◽  
Efficient Lasing ◽  
Pulse Energies

The CompactLight European consortium is designing a state-of-the-art X-ray free-electron laser driven by radiofrequency X-band technology. Rooted in experimental data on photo-injector performance in the recent literature, this study estimates analytically and numerically the performance of the CompactLight delivery system for bunch charges in the range 75–300 pC. Space-charge forces in the injector, linac transverse wakefield, and coherent synchrotron radiation in bunch compressors are all taken into account. The study confirms efficient lasing in the soft X-rays regime with pulse energies up to hundreds of microjoules at repetition rates as high as 1 kHz.

scholarly journals Alexander Béla (1857-1916), a magyar radiológia „nagy embere” emlékezete halála 105. évfordulóján

2021 ◽  
Vol 11 (22) ◽  
pp. 343-362
Author(s):  
Éva Bruckner
Keyword(s):  
Medical School ◽  
Lower Limbs ◽  
Career Ladder ◽  
X Rays ◽  
X Ray ◽  
International Reputation ◽  
Medical School Graduation ◽  
School Graduation ◽  
Scientific Value ◽  
The University

Béla Alexander, born in the historical Upper Hungary (Slovakia today) dedicated his whole life to X-rays discovered by Conrad Röntgen. After medical school graduation, he was known as a poet and a community activist as well. For more than ten years he was treating indigent people in Késmárk (Kežmarok today) in the daylight time and experimented with X-rays during the nights. Although Alexander gained an international reputation for his X-ray images and studies, made and written about upper and lower limbs’ bones, the scientific value of his stereoscopic X-rays was argued in Hungarian academic circles. Due to his successful struggles, Alexander moved up the career ladder in the capital Budapest from 1907. Milestones of his career: director of the X-ray lab between 1906 and 1907, then the director of the University Institute for X-rays between 1907 and 1916, which was established on his former X-ray lab.) After his death caused by X-rays, directors of the Institute continued Alexander’s work between the two World Wars.

Preparation and Characterization of (CO3O5, Fe2O3: Sn) Nanocomposite for Sensitize Photoelectrodes

2021 ◽  
Vol 1039 ◽  
pp. 326-331
Author(s):  
Haleemah J. Mohammed
Keyword(s):  
Laser Pulse ◽  
Raw Materials ◽  
Second Step ◽  
Electrolysis Cell ◽  
X Ray Diffraction ◽  
Yag Laser ◽  
X Ray ◽  
Atomic Force ◽  
Electrochemical Parameters

Preparation of nanocomposite ( CO3O5,Fe2O3: Sn ) was chemically held from its raw materials as a first step of this research in order to manufacture photoelectrode , this nanocomposite was deposited on substrate glass using spraying technique and heat treatment by Nd: YAG laser pulse (LPD) . Experiments were conducted to study the surface topography of the nanocompound by (AFM) to determine the roughness of the prepared electrode, In addition, the structure characteristics were studied using the x-ray diffraction (XRD) to determine the main phase. The second step of this research was designing a glass electrolysis cell containing our nanoelectrode and producing hydrogen. Finally the electrochemical parameters of the designed cell were studied Key words: nanocomposite (CO3O5,Fe2O3:Sn), Nd: YAG laser pulse (LPD) , Photoelectrodes; atomic force microscope.

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