Title :
RF impedance measurements of the various vacuum chambers for the Advanced Photon Source (APS)
Author :
Song, J.J. ; Howell, J.W. ; Kustom, R.L. ; Bridges, J.F.
Author_Institution :
Argonne Nat. Lab., IL, USA
Abstract :
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.<>
Keywords :
electric impedance; storage rings; vacuum apparatus; 7 GeV; APS; Advanced Photon Source; RF impedance measurements; ante-chamber; center wire; computer simulation; coupling impedance; frequency domain measurement; impedance budget; internal RF screen; photon absorber; pulse length; storage ring; synthetic pulse; time domain measurement; vacuum chambers; vacuum components; vacuum valve; Frequency domain analysis; Frequency measurement; Impedance measurement; Pulse measurements; Radio frequency; Storage rings; Testing; Time measurement; Vacuum technology; Valves;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.164408
