摘要:

A critical review of some of the highlights of the Eighth International Conference on Synchrotron Radiation Instrumentation is presented. Contributions attempting to bridge the gap between third and fourth generation synchrotron sources are given particular attention. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1757721

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

Negative alpha‐p operation has been successfully performed at 1 GeV in the NewSUBARU storage ring. Microwave and fast head tail instabilities were measured in comparison with those in the positive alpha‐p case. The fundamental mechanism is well understood by the established theory based on the positive alpha‐p case, but the resultant behavior is very different. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1757722

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

The Synchrotron Light Life Science Center of Ritsumeikan University seeks the next generation life science beyond genomics and proteomics by the unique portable synchrotrons named MIRROCLE. MIRRORCLE‐6X generates brilliant hard x‐rays in spite of its 6‐MeV electron energy. The power of IR/FIR beam from MIRRORCLE‐20 is much higher than any synchrotrons by its unique mirror system introduced to collect the synchrotron light from whole arc of the electron orbit. Unique applications are also described. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1757723

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

We have adopted matching pursuit algorithm of discrete wavelet transform (DWT) for the analysis of the beam position shift correlated with the motion of insertion device(ID). The beam position data measured by the rf beam position monitors have included high‐frequency ‘noises’ and fluctuation of background level. Precise evaluation of the electron beam position shift correlated with the motion of the ID is required for estimation of the steering magnet currents in order to suppress the closed orbit distortion (COD). The DWT is a powerful tool for frequency analysis and data processing. The analysis of DWT was applied to the beam position shift correlated with the phase motion of APPLE‐2 type undulator (ID23) in SPring‐8. The result of the analysis indicated that ‘noises’ are mainly composed of the components of 50 ∼ 6.25Hz and < 0.1Hz. We carried out the data processing to remove the ‘noises’ by the matching pursuit algorithm. Then we have succeeded in suppressing the COD within 2 &mgr;mby the use of the steering magnet currents calculated from the processed data. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1757724

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

The University of Tokyo proposed to construct a new synchrotron radiation facility with a 1.8 GeV electron storage ring of a third generation type in its Kashiwa new campus. It is a cooperative facility and to be operated for worldwide users. The conspicuous feature of the new light source is that every part of the accelerators is designed adapting to the “top‐up injection” to overcome the short lifetime of the electron beam in a storage ring operated with relatively low energy. New monochromators and beamlines suitable for various types of undulator were designed. The scientific programs have been proposed by nationwide scientists with their requirements of the characteristics of synchrotron radiation from undulators and dipole magnets. Also see, http://www.issp.u‐tokyo.ac.jp/labs/sor/project/. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1757725

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

A high brightness sub‐picosecond x‐ray source can be created by installing an undulator at Jefferson Lab’s CEBAF, a nuclear physics electron accelerator. Although the beam current is only 100 microamps, the electron beam has an extremely small emittance and energy spread, with the result that one can produce x‐ray beams tunable over the range 5–30keV with an average brightness quite comparable to beamlines at the Advanced Photon Source (APS) at Argonne National Lab. In addition, with rms bunch lengths measured down to 85 fsecs, peak brightness values are much higher than at the APS. Furthermore, this x‐ray source has similar emittance in both horizontal and vertical directions, (a so‐called round beam) making it of very high potential for many applications. In order to determine if indeed such a source is worth pursuing we present “tuning curve” calculations of peak and average flux and brightness for an undulator on CEBAF. They are compared with similar calculations for a dipole and for undulator‐A at the APS. Finally we calculate the impact of such a device on the CEBAF beam itself itself and find it to be much smaller than the natural energy spread of the beam. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1757726

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

The PF‐AR is a full‐time single‐bunch light source for SR experiments in the X‐ray region. Electrons are injected at 3.0 GeV and ramped up to the final energy of 6.5 GeV for normal user operation or 5.0 GeV for medical application. The typical initial beam current is 55 mA at 6.5 GeV and the beam lifetime is 15 h at 50 mA. The initial single‐bunch impurity better than 10−8was achieved, however, degradation of the impurity during the users’ run has to be solved. Since the present emittance of 290nm⋅rad is not satisfactory, we are making an effort to realize the minimum attainable emittance of 160nm⋅rad. The high quality of pulse X‐ray has brought us abundant occasions to do time‐domain and/or time‐resolved measurements. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1757727

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

We report the technical problems encountered in commissioning and improving the performance of the accelerator complex which consists of a 1 GeV light source storage ring, a 1 GeV booster synchrotron, and a 40 MeV injector linac. Regulation work for an attached beam line with an experimental station for photoemission studies is also described. Beam instability and low injection efficiency are the major issues for the accelerator complex. In the beam line, the accurate optical alignment of the monochromator system and the modification of the measurement control software supplied by a marker are the work having been performed. The results of the work on the accelerator complex will be helpful to the commissioning of the machine obtained secondhand and reformed to some extent. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1757728

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

The source size and angular divergence are very important properties which are necessary to design optical elements in the beamline. We report on the source distribution of wiggler radiation (WR), which is not expressed as simple expressions as the undulator radiation. Assuming that the WR is completely incoherent, angular and spatial profile functions are derived as the simple summation of those of photons emitted at every position of the wiggler. Then, the beam size and angular divergence are calculated using these functions. Simple mathematical functions to approximate these values are shown to help the synchrotron radiation users and beamline scientists estimate their own beamline performances. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1757729

出版商:AIP    

年代:1904

数据来源: AIP

摘要:

Developed under the auspices of UNESCO, SESAME (Synchrotron‐light forExperimentalScience andApplications in theMiddleEast) will be a major international research centre in the Middle East and Mediterranean region. On 6thof January 2003, the official foundation of SESAME took place. The facility is located in Allan, Jordan, 30 km North‐West of Amman. As of August 2003 the Founding Members are Bahrain, Egypt, Iran, Israel, Jordan, Pakistan, Palestine, Turkey and United Arabic Emirates, representing a population of over 300 million. SESAME will be a 2.5 GeV 3rdGeneration light source (emittance 24.6 nm.rad, circumference ∼125m). About 40&percent; of the circumference is available for insertion devices (average length 2.75m) in 13 straight sections. Beam lines are up to 36m. The site and a building are provided by Jordan. Construction started in August 2003. The scientific program will start with up to 6 beam lines: MAD Protein Crystallography, SAXS and WAXS for polymers and proteins, Powder Diffraction for material science, UV/VUV/SXR Photoelectron Spectroscopy and Photoabsorption Spectroscopy, IR Spectroscopy, and EXAFS. © 2004 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1757730

出版商:AIP    

年代:1904

数据来源: AIP