dorsal/arxiv
View SchemaBeam Position-Phase Monitors for SNS Linac
| Authors | Sergey S. Kurennoy |
|---|---|
| Categories | |
| ArXiv ID | physics/0008095 |
| URL | https://arxiv.org/abs/physics/0008095 |
| Journal | eConf C000821:MOC11,2000 |
Abstract
Electromagnetic modeling with MAFIA of the combined beam position-phase monitors (BPPMs) for the Spallation Neutron Source (SNS) linac has been performed. Time-domain 3-D simulations are used to compute the signal amplitudes and phases on the BPPM electrodes for a given processing frequency, 402.5 MHz or 805 MHz, as functions of the beam transverse position. Working with a summed signal from all the BPPM electrodes provides a good way to measure accurately the beam phase. While for an off-axis beam the signal phases on the individual electrodes can differ from those for a centered beam by a few degrees, the phase of the summed signal is found to be independent of the beam transverse position inside the device. Based on the analysis results, an optimal BPPM design with 4 one-end-shorted 60-degree electrodes has been chosen. It provides a good linearity and sufficient signal power for both position and phase measurements, while satisfying the linac geometrical constrains and mechanical requirements.
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"abstract": "Electromagnetic modeling with MAFIA of the combined beam position-phase\nmonitors (BPPMs) for the Spallation Neutron Source (SNS) linac has been\nperformed. Time-domain 3-D simulations are used to compute the signal\namplitudes and phases on the BPPM electrodes for a given processing frequency,\n402.5 MHz or 805 MHz, as functions of the beam transverse position. Working\nwith a summed signal from all the BPPM electrodes provides a good way to\nmeasure accurately the beam phase. While for an off-axis beam the signal phases\non the individual electrodes can differ from those for a centered beam by a few\ndegrees, the phase of the summed signal is found to be independent of the beam\ntransverse position inside the device. Based on the analysis results, an\noptimal BPPM design with 4 one-end-shorted 60-degree electrodes has been\nchosen. It provides a good linearity and sufficient signal power for both\nposition and phase measurements, while satisfying the linac geometrical\nconstrains and mechanical requirements.",
"arxiv_id": "physics/0008095",
"authors": [
"Sergey S. Kurennoy"
],
"categories": [
"physics.acc-ph"
],
"journal_ref": "eConf C000821:MOC11,2000",
"title": "Beam Position-Phase Monitors for SNS Linac",
"url": "https://arxiv.org/abs/physics/0008095"
},
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