CERN Accelerating science

Article
Title	Commissioning of SAGA Light Source
Author(s)	Tomimasu, Takio ; Iwasaki, Yoshitaka ; Koda, Shigeru ; Ohgaki, Hideaki ; Takabayashi, Yuichi ; Toyokawa, Hiroyuki ; Yasumoto, Masato ; Yoshida, Katuhide
Affiliation	(AIST, Ibaraki) ; (Kyoto IAE, Kyoto) ; (Saga Synchrotron Light Source, Saga City)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.4021
Subject category	Accelerators and Storage Rings
Abstract	The SAGA Light Source (SAGA-LS) consists of a 250-MeV electron linac injector and an eight-hold symmetry 1.4-GeV storage ring with eight double-bend (DB) cell and eight 2.93-m long straight sections. The DB cell structure with a distributed dispersion system was chosen to produce a compact ring of 75.6-m long circumference. The machine construction begun September 29, 2003. The ring magnets of steel laminated structure, vacuum chambers made of aluminum alloy, pumping systems and four temperature controlled cooling water systems for the linac accelerating wave guides etc. were installed in March, 2004. The injector, a 500-MHz ring rf damped cavity, rf klystrons, beam transport systems for injection and their controlled systems were installed in July, 2004. The commissioning begun August 25, 2004. A 250-MeV beam was accelerated on September 29. The beam size is 1-mm in diameter and the energy spread is 0.8 % (FWHM). The first revolution of 250-MeV beam around the ring took place October 22. Beam was stored on November 12. The commissioning continues for beam storage and ramping to 1.4-GeV. We report a brief description of SAGA light source and early commissioning activities.