No abstract available

[en] The Topography X-ray Laboratory of the Advanced Photon Source (APS) at Argonne National Laboratory operates as a collaborative effort with APS users to produce high performance crystals for APS X-ray beamline experiments. For many years the topography laboratory has worked closely with an on-site optics shop to help ensure the production of crystals with the highest quality, most stress-free surface finish possible. It has been instrumental in evaluating and refining methods used to produce high quality crystals. Topographical analysis has shown to be an effective method to quantify and determine the distribution of stresses, to help identify methods that would mitigate the stresses and improve the Rocking curve, and to create CCD images of the crystal. This paper describes the topography process and offers methods for reducing crystal stresses in order to substantially improve the crystal optics.

[en] An international collaboration of software developers has been working for several years to advance the state of the art of control systems and has produced software and development methods that are directly applicable to synchrotron radiation (SR) instrumentation. The software is collectively entitled EPICS and is essentially an extensible tool kit for implementing distributed control systems. The EPICS collaboration now includes developers representing many of the Advanced Photon Source (APS) beamlines, as well as developers from the Stanford Synchrotron Radiation Laboratory, the Advanced Light Source, and the Gemini and Keck telescopes. As part of this collaboration, we have developed software tools for controlling and acquiring data from SR beamlines and combined them with tools developed by others to support laboratories and experiments at the APS and other SR facilities. Applications of EPICS-based software in SR instrumentation will be described, some consequences of collaborative development will be discussed, and the intended impact of this software on the science conducted at SR facilities will be discussed. copyright 1996 American Institute of Physics

[en] The Accelerator Systems String Test (ASST) was a major milestone in SSCL R ampersand D. Phase I demonstrated that the smallest repetitive sequence of bending magnets ( a half cell) could be installed, leak checked, cooled to liquid helium temperatures, energized, and safely quenched. To support this activity, a control system had to be developed to operate and monitor cryogenic systems in the string, along with LCW and vacuum systems. Also, since this is a test facility, the magnet systems were heavily instrumented to provide sufficient data to confirm that design requirements were met, that the system was operating safely and as expected, and allow further design studies necessary for the construction of the SSC. This required the design and implementation of an acquisition system capable of collecting relatively large amounts of data, at various data rates, and presenting this data both to operations personnel and to a database for off-line analysis. In this paper, we describe the design, implementation, and operation of the data acquisition system and controls employed on the ASST

[en] The Accelerator Systems String Test (ASST) was a major milestone in SSCL R ampersand D. Phase I demonstrated that the smallest repetitive sequence of bending magnets (a half cell) could be installed, leak checked, cooled to liquid helium temperatures, energized, and safely quenched. To support this activity, a control system had to be developed to operate and monitor cryogenic systems in the string, along with LCW and vacuum systems. Also, since this is a test facility, the magnet systems were heavily instrumented to provide sufficient data to confirm that design requirements were met, that the system was operating safely and as expected, and allow further design studies necessary for the construction of the SSC. This required the design and implementation of an acquisition system capable of collecting relatively large amounts of data, at various data rates, and presenting this data both to operations personnel and to a database for off-line analysis. In this paper, the authors describe the design, implementation, and operation of the data acquisition system and controls employed on the ASST

No abstract available

No abstract available

[en] Beamline-control and data-acquisition software based on EPICS (a tool kit for building distributed control systems) has been running on many Advanced Photon Source beamlines for several years. EPICS itself, the collaborative software-development effort surrounding it, and EPICS-based beamline software have been described previously in general terms. This talk will review and update that material, focusing on the role EPICS core software plays in beamline applications and on the effects of a few defining characteristics of EPICS on the beamline software we have developed with it

[en] A 0.27 meV-bandwidth monochromator for 21.5 keV synchrotron radiation demonstrates exceptional stability using cryogenic stabilization and active feedback control. A high-resolution silicon monochromator suitable for 21.541 keV synchrotron radiation is presented that produces a bandwidth of 0.27 meV. The operating energy corresponds to a nuclear transition in "1"5"1Eu. The first-of-its-kind, fully cryogenic design achieves an energy-alignment stability of 0.017 meV r.m.s. per day, or a 100-fold improvement over other meV-monochromators, and can tolerate higher X-ray power loads than room-temperature designs of comparable resolution. This offers the potential for significantly more accurate measurements of lattice excitation energies using nuclear resonant vibrational spectroscopy if combined with accurate energy calibration using, for example, high-speed Doppler shifting. The design of the monochromator along with its performance and impact on transmitted beam properties are presented

[en] Case History and Findings: A 73-year-old woman with a history of myeloproliferative syndrome (MPS) presented with bilateral chemosis, redness and burning of the eyes. The ocular motility was severely impaired. Ophthalmological examination revealed markedly distended conjunctivas on both sides. Biopsy disclosed conjunctival granulocytic sarcoma as an initial symptom of acute myelogenous leukemia (AML). Diagnosis was confirmed by peripheral blood smear and bone marrow aspiration. Treatment and Outcome: The orbital tumor disappeared completely after local external beam irradiation with a total dose of 30 Gy and no further orbital recurrence occurred. With chemotherapy following irradiation transient hematological remission was achieved. 5 months after diagnosis the patient died of respiratory failure following atypical pneumonia as a consequence of her underlying disorder. Conclusion: Detection of orbital granulocytic sarcoma, even in the absence of typical leukemic symptoms is of practical importance, because treatment with irradiation can lead to stabilization or improvement in the patient's vision. (orig.)