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A W-band Gyro-BWO based on helically corrugated waveguide

He, Wenlong and Phelps, A.D.R. and Donaldson, C. R. and Cross, A.W. and Ronald, Kevin (2007) A W-band Gyro-BWO based on helically corrugated waveguide. In: Joint 32nd International Conference on Infrared and Millimeter Waves/15th International Conference on Terahertz Electronics, 2007-09-03 - 2007-09-09.

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Abstract

We present a viewport for use in ultrahigh vacuum (UHV) based upon the preflattened solder seal design presented in earlier work [Cox , Rev. Sci. Instrum. 74, 3185 (2003)]. The design features significant modifications to improve long term performance. The windows have been leak tested to less than 10(-10) atm cm(3)/s. From atom number measurements in an optical dipole trap loaded from a vapor cell magneto-optical trap inside a vacuum chamber accommodating these viewports, we measure a trap lifetime of 9.5 s suggesting a pressure of around 10(-10) Torr limited by background rubidium vapor pressure. We also present a simplified design where the UHV seal is made directly to a vacuum pipe.