History
An excerpt from the minutes of “219th High Energy Committee.”
Date and hour: September 14, 2005, 17:30-18.45.
Place: Osaka City University
1. Inherited matters (old and new commission members attended)
1-1. For the construction of a test beam line, considering surrounding situations, it is necessary that the measure is continuously taken as the main subject, and demand it.

Overview
In the KEK B ring Fuji linear part, utilizing Bremsstrahlung g-rays from the 8 GeV HER, we plan to construct an electron beam line of approximately 3 GeV to serve as test beam for the development of various kinds of measuring equipment.

- High-energy g-ray (Bremsstrahlung) is generated by the reaction of remaining gas (CO, 3x10-8 Pa) with the HER beam (1.3 A).
- In the upper stream of the Fuji intersection part, a comparatively strong polarized electric magnet (BX1E.1) is set at a straight part of 100 m and its terminal.
- By optimizing the shape of the beam pipe in the polarized electromagnet, g-rays can be taken out with a small loss to utilize as a comparatively collimated beam.

http://www-online.kek.jp/~drd/KEKDTP/test2/index.php?plugin=attach&refer=TestBeamLine&openfile=P1010511-1.jpg

Figure 1. Current status of beam line (center)

References
1) Junji Haba, KEKB MAC Report.
2) Junji Haba, Akio Morita, Journal of the Particle Accelerator Society of Japan, Vol. 4, No. 2, 2007 (131-135) (see attached file: FTBLReportjun20.pdf)