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Vacuum Waveguide for the X Ray Region

IP.com Disclosure Number: IPCOM000081807D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Anderson, JP: AUTHOR

Abstract

A waveguide is provided for soft x-rays. Since x-rays are highly absorptive in air, it is desirable to provide guides for such x-rays that are capable of being self-sustaining in an evacuated chamber. The x-rays traversing such evacuated waveguides are negligibly absorbed.

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Vacuum Waveguide for the X Ray Region

A waveguide is provided for soft x-rays.

Since x-rays are highly absorptive in air, it is desirable to provide guides for such x-rays that are capable of being self-sustaining in an evacuated chamber. The x-rays traversing such evacuated waveguides are negligibly absorbed.

The waveguide's construction is begun (as seen in Fig. 1) by depositing a film of metal 2, for example, gold, on a substrate 4. A channel 6 is etched in the metal film 2 to a width that corresponds to the width of the desired waveguide.

A thin layer 8 of gold is deposited within the channel 6. Two walls and the floor of channel 6 are gold. In order to make all the surfaces of closed channel 6 of gold, a very thin film 10 of a material sold as PARYLENE N* (C(8)H(8)) is supported on a substrate, not shown, and a second thin layer 12 of gold is deposited onto the PARYLENE N. The PARYLENE N is stripped from its substrate and the gold film 12 on it is placed over the length of the channel 6 so that when the waveguide is placed in an evacuated chamber 14, the gold film 12 is drawn toward the gold layer 2. An x-ray impermeable block 16 is located over the channel 6.

As seen in Fig. 3, an x-ray beam 18, entering the waveguide channel 6 disposed in a vacuum at the appropriate angle, is reflected by the walls of the channel along the length of the channel. The block 16 prevents the transmission of the x-ray beam through the upper wall of the channel as the beam trave...