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19 April 2024 |
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RF Couplers for Normal-Conducting Photoinjector of High-Power CW FEL | | Sergey Kurennoy
; Dale Schrage
; Richard Wood
; Tom Schultheiss
; John Rathke
; Lloyd Young
; | | Date: |
23 Apr 2004 | | Subject: | Accelerator Physics | physics.acc-ph | | Affiliation: | LANL), Tom Schultheiss, John Rathke (AES), Lloyd Young (TechSource | | 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. | | Source: | arXiv, physics/0404109 | | Services: | Forum | Review | PDF | Favorites | |
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