| Paper |
Title |
Page |
| MOPKF043 |
An Ultra-high Brightness, High Duty Factor, Superconducting RF Photoinjector
|
402 |
| |
- M. Ferrario
INFN/LNF, Frascati (Roma)
- J. Rosenzweig
UCLA, Los Angeles, California
- J. Sekutowicz
DESY, Hamburg
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Recent advances in superconducting rf technology, and an improved understanding of rf photoinjector design optimization make if possible to propose a specific design for a superconducting rf gun which can simultaneously produce both ultra-high peak brightness, and high average current. Such a device may prove to be a critical component of next generation x-ray sources such as self-amplified spontaneous emission free-electron lasers (SASE FEL) and energy recovery linac (ERL) based systems. The design presented is scaled from the present state-of-the-art normal conducting rf photoinjector that has been studied in the context of the LCLS SASE FEL. Issues specific to the superconducing rf photoinjector, such as accelerating gradient limit, rf cavity design, and compatibility with magnetic focusing and laser excitation of a photocathode, are discussed.
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| TUPKF078 |
High Current Superconducting Cavities at RHIC
|
1120 |
| |
- R. Calaga, I. Ben-Zvi, Y. Zhao
BNL, Upton, Long Island, New York
- J. Sekutowicz
Jefferson Lab, Newport News, Virginia
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A five-cell high current superconducting cavity for the electron cooling project at RHIC is under fabrication. Higher order modes (HOMs), one of main limiting factors for high current energy-recovery operation, are under investigation. Calculations of HOMs using time-domain methods in Mafia will be discussed and compared to calculations in the frequecy domain. A possible motivation towards a 2x2 superstructure using the current five-cell design will be discussed and results from Mafia will be presented. Beam breakup thresholds determined from numerical codes for the five-cell cavity as well as the superstructure will also be presented.
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| TUPKF080 |
Photoemission Properties of Lead
|
1126 |
| |
- J. Smedley, T. Srinivasan-Rao, J. Warren
BNL, Upton, Long Island, New York
- R.S. Lefferts, A.R. Lipski
SBUNSL, Stony Brook, New York
- J. Sekutowicz
Jefferson Lab, Newport News, Virginia
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There is significant interest in the possibility of building a super-conducting injector for high average current accelerator applications. One candidate for such a cavity design is superconducting lead. Such an injector would be made considerably simpler if it could be designed to use lead as the photocathode, eliminating the need for Cesiated materials in the injector. In this paper we present a study of the photoemission properties of lead at several UV wavelengths, including a study of the damage threshold of electroplated lead under laser cleaning. A quantum efficiency in excess of 0.1% has been achieved for a laser cleaned, electroplated lead sample with a laser wavelength of 193 nm.
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