The microwave transmission system for ERCH on MFTF-B will utilize quasi-optical transmission techniques. The system consists of ten gyrotron oscillators: two gyrotrons at 28 GHz, two at 35 GHz, and six at 56 GHz. The 28 and 35 GHz gyrotrons both heat the electrons in the end plug (potential peak) while the 56 GHz sources heat the minimum-B anchor region (potential minimum). Microwaves are launched into a pair of cylindrical mirrors that form a pseudo-cavity which directs the microwaves through the plasma numerous times before they are lost out of the cavity. The cavity allows the microwave beam to reach the resonance zone over a wide range of plasma densities and temperatures. The fundamental electron cyclotron resonance moves to higher axial positions as a result of beta-depression of the magnetic field, doppler shifting of the resonance, and relativistic mass corrections for the electrons. With this system the microwave beam will reach the resonance surface at the correct angle of incidence for any density or temperature without active aiming of the antennas. The cavity also allows the beam to make multiple passes through the plasma to increase the heating efficiency at low temperatures and densities when the single pass absorption is …

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Photograph used for a story in the Oklahoma Times newspaper. Caption: "Tony Tabor, front , and Joe Goddard set up Del City's new civil defense siren outside the police department."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Mrs. Gray Davis, Mrs. t. P. Hadley and Mrs. J. R. Gray, from left, spend an afternoon addressing invitations for the Thanksgiving Pantry which will be held Monday at Oklahoma Museum of Art."

Photograph used for a story in the Oklahoma Times newspaper.

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Mrs. Carey and Nancy Davies of Enid."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Melanie Boaz, Mrs. Murrah and Millicent Gillogly form left, wrap packages for the the benefit card party sponsored annually by Alpha Gamma Delta."

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Photograph used for a story in the Daily Oklahoman newspaper. Caption: "A million-dollar expansion program is under way at Putnam City Methodist Church, NW 41 and MacArthur in Warr Acres."

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Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Weekly newspaper from Jacksboro, Texas that includes local, state, and national news along with extensive advertising.

Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.

Photograph used for a story in the Oklahoma Times newspaper. Caption: "Don Close displays his two computer safeguard devices."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Steve Shirley of Ponca City shows off young tom bagged in western Oklahoma."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Junior League past presidents Hayden Lowry, left, and Carolyn Mee have Lunch together at The Cellar."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "The Urban Renewal Authority is knocking on the other side side of this underground wall, but county commissoners say they can't come through until they do some rapping of another kind."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "At a dinner preceding the Pavorotti concert are Dr. George Farha, Dr. Allen Greer, Dr. John Salmeron and william Shdeed."

Photograph used for a story in the Daily Oklahoman newspaper. Caption: "U.S. Sen. John Tower, R-Texas, inspects a captured rifle in a Cuban barracks on Grenada. Tower and 13 other congressmen are touring the island."

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.