| Paper |
Title |
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| MOO3A03 |
First Vibrating Wire Monitor Measurements of a Hard X-ray Undulator Beam at the Advanced Photon Source
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36 |
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- G. Decker
ANL, Argonne, Illinois
- S. G. Arutunian, M. R. Mailian
YerPhI, Yerevan
- G. Rosenbaum
UGA, Athens, Georgia
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The first hard x-ray flux measurements with a vibrating wire monitor (VWM) using the acoustic resonance frequencies of two vertically-offset horizontal stainless steel wires as temperature diagnostics were conducted at APS beamline 19-ID. Due to the high sensitivity of this technique, the studies were performed at extremely low power levels using radiation from a 3.3-cm-period permanent magnet hybrid undulator with a 5-mA electron beam at an energy of 7 GeV. The x-ray beam was filtered by transmission through 7 mm of beryllium placed in the photon beam path, assuring that only hard x-rays were detected. The particle beam was scanned through a range of 400 microradians using an asymmetric closed-orbit angle bump, producing two vertical photon beam profiles. The difference between processed wire signals provides a very sensitive measure of photon beam position. Details of the measurements will be given, along with a discussion of the limitations of the method and possible future research directions.
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Slides
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| WEPB26 |
Transition Thermal Processes In Vibrating Wire Monitors
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292 |
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- S. G. Arutunian, M. R. Mailian
YerPhI, Yerevan
- G. Decker
ANL, Argonne, Illinois
- G. Rosenbaum
UGA, Athens, Georgia
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Dynamic characteristics of vibrating wire monitors (VWM) strongly depend on the media where the wire oscillates, and also on the geometry and materials of the wire and VWM housing. On the basis of a one-dimensional model of heat transfer along the wire, the time characteristics of transition processes of thermal equilibrium profiles are defined for wires of different materials and geometry. To decrease the response time of the VWM, a new scheme of measurement with constant mean temperature is suggested. In addition to the flux of particles/radiation deposited on the wire, the additional DC current maintains a constant wire oscillation frequency. The value of DC current serves as measure of particles/radiation flux.
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