The maximum vacuum insulator surface dielectric strength determines the acceleration electric field gradient possible in a short pulse accelerator. Previous work has indicated that higher electric field strengths along the insulator-vacuum interface might be obtained as the pulse duration is decreased. In this work, a 250 kV, single ns wide impulse source was applied to small diameter, segmented insulators samples in a vacuum to evaluate the multi-layer surface dielectric strength of the sample construction. Resonances in the low inductance test geometry were used to obtain unipolar, pulsed electric fields in excess of 100 MV/m on the insulator surface. The sample construction, experimental arrangement and experimental results are presented for the initial data in this work. Modeling of the multi-layer structure is discussed and methods of improving insulator surface dielectric strength in a vacuum are proposed.

Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.

High gradients in radio-frequency (RF) driven accelerators require short wavelengths that have the concomitant requirements of small feature size and high tolerances, 1-2 {micro}m for millimeter wavelengths. Precision metal-forming stampling has the promise of meeting those tolerances with high production rates. This STI will evaluate that promise.

Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.

Cuba under Fidel Castro remains a hard-line communist state with a poor record on human rights that has deteriorated significantly since 2003. With the cutoff of assistance from the former Soviet Union, Cuba experienced severe economic deterioration from 1989 to 1993. While there has been some improvement since 1994, as Cuba has implemented limited reforms, the economy remains in poor shape. This report discusses the most recent development in Cuba, including political and economic conditions and the U.S. policy towards Cuba. It also considers the issues in U.S.-Cuban Relations.

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This report provides information about the Background and Issues for Congress on Homeland Security Coast Guard Operations which is a military service and a branch of the armed forces,within the navy upon the declaration of war or when President directs until the president by executive orders it back to DHS

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This report presents an overview of the Armenia-Azerbaijan conflict. This is a clash between the principles of territorial integrity and self-determination that is occurring in the Caucasus, creating the longest inter-ethnic dispute in the former Soviet Union. The report includes the background and analysis of history, warfare and peace process in the region. The report discusses the Armenian and Azerbaijani perspective, the role and views of others (Iran, Turkey, Russia), as well as the U.S. policy regarding the conflict.

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Semiweekly newspaper from Sealy, Texas that includes local, state, and national news along with advertising.

Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.

This report discusses the developments in Iranian foreign policy, including their assistance the U.S. in ousting Saddam Hussein, their involvement with terrorist organizations, the developments made with respect to weapons of mass destruction, and human rights concerns. It also details the Bush Administration's efforts to maintain the sanctions put in place by the Clinton Administration, as well as U.S. foreign policymakers division on which approach to take regarding Iran's political regime.

Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.

Semiweekly newspaper from Brady, Texas that includes local, state, and national news along with advertising.