dorsal/arxiv
View SchemaRF Couplers for Normal-Conducting Photoinjector of High-Power CW FEL
| Authors | Sergey Kurennoy, Dale Schrage, Richard Wood, Tom Schultheiss, John Rathke, Lloyd Young |
|---|---|
| Categories | |
| ArXiv ID | physics/0404109 |
| URL | https://arxiv.org/abs/physics/0404109 |
Abstract
A high-current emittance-compensated RF photoinjector is a key enabling technology for a high-power CW FEL. A preliminary design of a normal-conducting, 2.5-cell pi-mode, 700-MHz CW RF photoinjector that will be built for demonstration purposes, is completed. This photoinjector will be capable of accelerating a 100-mA electron beam (3 nC per bunch at 35 MHz bunch repetition rate) to 2.7 MeV while providing an emittance below 7 mm-mrad at the wiggler. More than 1 MW of RF power will be fed into the photoinjector cavity through two ridge-loaded tapered waveguides. The waveguides are coupled to the cavity by "dog-bone" irises cut in a thick wall. Due to CW operation of the photoinjector, the cooling of the coupler irises is a rather challenging thermal management project. This paper presents results of a detailed electromagnetic modeling of the coupler-cavity system, which has been performed to select the coupler design that minimizes the iris heating due to RF power loss in its walls.
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"abstract": "A high-current emittance-compensated RF photoinjector is a key enabling\ntechnology for a high-power CW FEL. A preliminary design of a\nnormal-conducting, 2.5-cell pi-mode, 700-MHz CW RF photoinjector that will be\nbuilt for demonstration purposes, is completed. This photoinjector will be\ncapable of accelerating a 100-mA electron beam (3 nC per bunch at 35 MHz bunch\nrepetition rate) to 2.7 MeV while providing an emittance below 7 mm-mrad at the\nwiggler. More than 1 MW of RF power will be fed into the photoinjector cavity\nthrough two ridge-loaded tapered waveguides. The waveguides are coupled to the\ncavity by \"dog-bone\" irises cut in a thick wall. Due to CW operation of the\nphotoinjector, the cooling of the coupler irises is a rather challenging\nthermal management project. This paper presents results of a detailed\nelectromagnetic modeling of the coupler-cavity system, which has been performed\nto select the coupler design that minimizes the iris heating due to RF power\nloss in its walls.",
"arxiv_id": "physics/0404109",
"authors": [
"Sergey Kurennoy",
"Dale Schrage",
"Richard Wood",
"Tom Schultheiss",
"John Rathke",
"Lloyd Young"
],
"categories": [
"physics.acc-ph"
],
"title": "RF Couplers for Normal-Conducting Photoinjector of High-Power CW FEL",
"url": "https://arxiv.org/abs/physics/0404109"
},
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