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Title: Slot-coupled CW standing wave accelerating cavity

Abstract

A slot-coupled CW standing wave multi-cell accelerating cavity. To achieve high efficiency graded beta acceleration, each cell in the multi-cell cavity may include different cell lengths. Alternatively, to achieve high efficiency with acceleration for particles with beta equal to 1, each cell in the multi-cell cavity may include the same cell design. Coupling between the cells is achieved with a plurality of axially aligned kidney-shaped slots on the wall between cells. The slot-coupling method makes the design very compact. The shape of the cell, including the slots and the cone, are optimized to maximize the power efficiency and minimize the peak power density on the surface. The slots are non-resonant, thereby enabling shorter slots and less power loss.

Inventors:
; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1357467
Patent Number(s):
9,655,227
Application Number:
14/731,887
Assignee:
JEFFERSON SCIENCE ASSOCIATES, LLC TJNAF
DOE Contract Number:
AC05-06OR23177
Resource Type:
Patent
Resource Relation:
Patent File Date: 2015 Jun 05
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Wang, Shaoheng, Rimmer, Robert, and Wang, Haipeng. Slot-coupled CW standing wave accelerating cavity. United States: N. p., 2017. Web.
Wang, Shaoheng, Rimmer, Robert, & Wang, Haipeng. Slot-coupled CW standing wave accelerating cavity. United States.
Wang, Shaoheng, Rimmer, Robert, and Wang, Haipeng. Tue . "Slot-coupled CW standing wave accelerating cavity". United States. doi:. https://www.osti.gov/servlets/purl/1357467.
@article{osti_1357467,
title = {Slot-coupled CW standing wave accelerating cavity},
author = {Wang, Shaoheng and Rimmer, Robert and Wang, Haipeng},
abstractNote = {A slot-coupled CW standing wave multi-cell accelerating cavity. To achieve high efficiency graded beta acceleration, each cell in the multi-cell cavity may include different cell lengths. Alternatively, to achieve high efficiency with acceleration for particles with beta equal to 1, each cell in the multi-cell cavity may include the same cell design. Coupling between the cells is achieved with a plurality of axially aligned kidney-shaped slots on the wall between cells. The slot-coupling method makes the design very compact. The shape of the cell, including the slots and the cone, are optimized to maximize the power efficiency and minimize the peak power density on the surface. The slots are non-resonant, thereby enabling shorter slots and less power loss.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 16 00:00:00 EDT 2017},
month = {Tue May 16 00:00:00 EDT 2017}
}

Patent:

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  • A compact accelerating structure comprises an accelerating section and a complementary section which may be used as a bunching section and/or a preaccelerating section, this complementary section being constituted by a first cavity and a second cavity joined to one another and electromagnetically coupled with one another in a direct manner, the second cavity, which is adjacent to the accelerating section, having a lenght L and being electromagnetically coupled to the first cavity and to the accelerating section in such a manner that the electromagnetic accelerating field is zero in this second cavity.
  • The spontaneous emission from an atom strongly coupled to a standing-wave cavity mode is studied. The interaction between the atom and the cavity mode is treated nonperturbatively. The spectra of spontaneous emission are first calculated using a classical model for the atomic center-of-mass motion. The spectra feature a multipeaked structure with peaks placed symmetrically about the resonant frequency, which can be understood in terms of interfering probability amplitudes for different quantum-mechanical emission paths or as a frequency-modulated spectrum for radiating coupled oscillators. The spontaneous emission spectra are then calculated by treating the atomic center-of-mass motion quantum mechanically. The new spectramore » agree with the classical spectra if the atom is heavy and fast. Generally the new spectra possess a complicated multipeaked structure which is asymmetric and can be interpreted as the result of transitions between the Bloch states (eigenstates of the atom-cavity system).« less
  • A small-size antenna having a doughnut-shaped field pattern and which can act both as an antenna and a resonant circuit is described. The antenna is of the slotted type and comprises a resonant cavity with a center hole. A circular slot is provided in one wall of the cavity concentric with the hole and a radio frequency source is connected across the slot. The pattern and loading of the antenna are adjusted by varying the position and shape of a center element slidably disposed within the hole and projecting from the slotted side of the resonant cavity. The disclosed structuremore » may also be used to propagate the oscillator signal down a transniission line by replacing the center element with one leg of the transmission line in a spaced relation from the walls of the cavity.« less
  • A symmetrical 180.degree. microwave hybrid is constructed by opening a slot line in a ground plane below a conducting strip disposed on a dielectric substrate, creating a slot coupled conductor. Difference signals propagating on the slot coupled conductor are isolated on the slot line leaving sum signals to propagate on the microstrip. The difference signal is coupled from the slot line onto a second microstrip line for transmission to a desired location. The microstrip branches in a symmetrical fashion to provide the input/output ports of the 180.degree. hybrid. The symmetry of the device provides for balance and isolation between summore » and difference signals, and provides an advantageous balance between the power handling capabilities and the bandwidth of the device.« less
  • This patent describes an apparatus for propagating microwave energy. It comprises a dielectric substrate having first and second opposed faces a first conducting member disposed on the first face of the dielectric substrate including a first portion having a longitudinal center line and terminating at a first end in a first port and having a second end, and second and third portions connected to the second end of the first portion extending away from the center line to terminate at second and third ports respectively; and a ground plane disposed on the second face of the dielectric substrate, the groundmore » plane having a gap therein defining an elongated slot parallel to and opposite the first portion and aligned with the center line for creating a slot coupled section, and arranged for energy propagation between the slot coupled section and a fourth port.« less