Abstract
Plans for the next generation of electron-positron colliders (B-factories and B-factory-like machines) call for high beam currents to produce luminosities of the order of 10 (exp 33). To store these high currents in a machine, special attention must be paied to the interaction of the beam with discontinuities in the surrounding vacuum chamber. RF cavities are among the biggest perturbations in accelerator vacuum chambers and are therefore among the biggest sources of beam instabilities. Accelerating structures of new machines are being designed to have smaller impedance to reduce the beam-cavity interaction. Prototypes for the cavity, input coupler, cryostat, and higher-order mode (HOM) loads were subjected and are tested in CESR. A superconducting (SRF) cavity was installed in addition to the four five-cell normal conducting cavities. As a result, the calorimetry and RF power results agree with predictions up to their respective uncertainties. The results of wake potential sampling suggested that the wake fields of the SRF cavity will not limit the performance of CESR in bunch train operation. No beam instabilities or dangerous HOMs were encountered while sweeping the HOM frequencies using the cavity tuner or while exciting multipole HOMs by displacing the beam off axis. (G.K.)
Belomestnykh, S;
Flynn, G;
Hartung, W;
Kirchgessner, J;
Moffat, D;
Muller, H;
Padamsee, H;
Pisharody, M;
Veshcherevich, V
[1]
- Cornell Univ., Ithaca, NY (United States). Lab. of Nuclear Studies
Citation Formats
Belomestnykh, S, Flynn, G, Hartung, W, Kirchgessner, J, Moffat, D, Muller, H, Padamsee, H, Pisharody, M, and Veshcherevich, V.
The interaction between a beam and a superconducting cavity module: Measurements in CESR and CESR-Phase 3 goals.
Japan: N. p.,
1996.
Web.
Belomestnykh, S, Flynn, G, Hartung, W, Kirchgessner, J, Moffat, D, Muller, H, Padamsee, H, Pisharody, M, & Veshcherevich, V.
The interaction between a beam and a superconducting cavity module: Measurements in CESR and CESR-Phase 3 goals.
Japan.
Belomestnykh, S, Flynn, G, Hartung, W, Kirchgessner, J, Moffat, D, Muller, H, Padamsee, H, Pisharody, M, and Veshcherevich, V.
1996.
"The interaction between a beam and a superconducting cavity module: Measurements in CESR and CESR-Phase 3 goals."
Japan.
@misc{etde_461192,
title = {The interaction between a beam and a superconducting cavity module: Measurements in CESR and CESR-Phase 3 goals}
author = {Belomestnykh, S, Flynn, G, Hartung, W, Kirchgessner, J, Moffat, D, Muller, H, Padamsee, H, Pisharody, M, and Veshcherevich, V}
abstractNote = {Plans for the next generation of electron-positron colliders (B-factories and B-factory-like machines) call for high beam currents to produce luminosities of the order of 10 (exp 33). To store these high currents in a machine, special attention must be paied to the interaction of the beam with discontinuities in the surrounding vacuum chamber. RF cavities are among the biggest perturbations in accelerator vacuum chambers and are therefore among the biggest sources of beam instabilities. Accelerating structures of new machines are being designed to have smaller impedance to reduce the beam-cavity interaction. Prototypes for the cavity, input coupler, cryostat, and higher-order mode (HOM) loads were subjected and are tested in CESR. A superconducting (SRF) cavity was installed in addition to the four five-cell normal conducting cavities. As a result, the calorimetry and RF power results agree with predictions up to their respective uncertainties. The results of wake potential sampling suggested that the wake fields of the SRF cavity will not limit the performance of CESR in bunch train operation. No beam instabilities or dangerous HOMs were encountered while sweeping the HOM frequencies using the cavity tuner or while exciting multipole HOMs by displacing the beam off axis. (G.K.)}
place = {Japan}
year = {1996}
month = {Aug}
}
title = {The interaction between a beam and a superconducting cavity module: Measurements in CESR and CESR-Phase 3 goals}
author = {Belomestnykh, S, Flynn, G, Hartung, W, Kirchgessner, J, Moffat, D, Muller, H, Padamsee, H, Pisharody, M, and Veshcherevich, V}
abstractNote = {Plans for the next generation of electron-positron colliders (B-factories and B-factory-like machines) call for high beam currents to produce luminosities of the order of 10 (exp 33). To store these high currents in a machine, special attention must be paied to the interaction of the beam with discontinuities in the surrounding vacuum chamber. RF cavities are among the biggest perturbations in accelerator vacuum chambers and are therefore among the biggest sources of beam instabilities. Accelerating structures of new machines are being designed to have smaller impedance to reduce the beam-cavity interaction. Prototypes for the cavity, input coupler, cryostat, and higher-order mode (HOM) loads were subjected and are tested in CESR. A superconducting (SRF) cavity was installed in addition to the four five-cell normal conducting cavities. As a result, the calorimetry and RF power results agree with predictions up to their respective uncertainties. The results of wake potential sampling suggested that the wake fields of the SRF cavity will not limit the performance of CESR in bunch train operation. No beam instabilities or dangerous HOMs were encountered while sweeping the HOM frequencies using the cavity tuner or while exciting multipole HOMs by displacing the beam off axis. (G.K.)}
place = {Japan}
year = {1996}
month = {Aug}
}