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Laser System with a Photocathode RF Gun at the Pohang Accelerator Laboratory
C. Kim,고인수,J. Choi,J. H. Park,황정연,박성주,Y. W. Parc 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
At the Pohang Accelerator Laboratory, a photocathode RF gun has been studied for a photo-injector of the 4th generation light source. This photocathode RF gun provides electron bunches with an energy of 5 MeV, a charge of 1 nC, and a bunch length of 10 ps. For this purpose, a Ti:Sapphire laser system that can deliver laser pulses of 2 mJ in energy and 110 fs in pulse width at a 800-nm wavelength was installed. The laser pulse passes through a third harmonic generator and pulse stretcher to generate a 266-nm laser pulse with a controllable pulse width (1 ps $\sim$ 15 ps). In this article, we introduce our laser system and report on recent progress in electron beam generation.
J. Choi,C. M. Yim,강흥식,고인수,J. H. Park,오종석,황정연,M. G. Kim,박성주,T.-Y. Lee,Y. J. Kim,Y. W. Parc 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
The Pohang Accelerator Laboratory is going to build an X-ray free electron laser (FEL) based on self-amplified spontaneous emission (SASE). This new machine will utilize the existing 2.5-GeV injection linac to the storage ring by upgrading its energy up to 3.7 GeV or more. The target wavelength will be 3 -- 4.5 \AA, and its third harmonic 1 -- 1.5 \AA~will also be used. The project will proceed in two stages: In the first stage, a vacuum-ultra-violet (VUV) SASE machine with 385 MeV will be constructed and tested for the proof of principle. The full X-ray machine will be constructed in the next stage. This paper describes the updated deign status of both machines.
박재훈,D. Xiang,고인수,J. H. Hong,황정연,S. H. Kim,박성주,X. J. Wang,Y. J. Park,Y. W. Parc 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
A Brookhaven National Laboratory (BNL) GUN-IV type photocathode rf gun has been fabricated to use in femto-second electron diffraction (FED), the femto-second far infra-red radiation (fs-FIR) facility, and the X-ray free electron laser (X-FEL) at the Pohang Accelerator Laboratory (PAL). The gun consists of a 1.6-cell cavity with a copper cathode, a solenoid magnet, beam diagnostic component and auxiliary systems. The dimensions of the cavity that provided the desired resonant frequency were determined by using the SUPERFISH code. The change in the resonant frequency due to the laser port and the wave-guide port on the cavity wall was estimated with Slater's perturbation theorem. The size of the ports was finalized by using a series of cutting and measuring processes. A method to measure the resonant frequency of the cavity during the operation was developed. Finally, the microwave and the basic beam parameters were measured carefully to confirm the successful fabrication of the photocathode RF gun system.