RF impedance measurements of the various vacuum chambers for the Advanced Photon Source (APS)

Coupling impedances (Z) for the 7-GeV APS storage ring were numerically estimated by Teng (1990). In order to confirm these calculations, measurements of the coupling impedance of various vacuum components around the main storage ring were done with a synthetic pulse technique. A section of the beam...

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Bibliographic Details
Main Authors: Song, J.J., Howell, J.W., Kustom, R.L., Bridges, J.F.
Format: Conference Proceeding
Language:English
Subjects:
Frequency domain analysis
Frequency measurement
Impedance measurement
Pulse measurements
Radio frequency
Storage rings
Testing
Time measurement
Vacuum technology
Valves
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Summary:Coupling impedances (Z) for the 7-GeV APS storage ring were numerically estimated by Teng (1990). In order to confirm these calculations, measurements of the coupling impedance of various vacuum components around the main storage ring were done with a synthetic pulse technique. A section of the beam and the ante-chamber, a vacuum valve with and without the internal RF screen, and a photon absorber were used as a device under test to obtain the preliminary results. The result in the frequency domain measurement was compared with a previous time domain measurement and with the computer simulation of the APS impedance budget given by Chou and Jin (1988). The Z or k dependence on the pulse length and the thickness of the center wire was examined.< >
DOI:10.1109/PAC.1991.164408