Gridded Window Testing Al Moretti, M. Alsharoa ; IIT and Muonsinc. 1 - - PowerPoint PPT Presentation

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Gridded Window Testing Al Moretti, M. Alsharoa ; IIT and Muonsinc. 1 - - PowerPoint PPT Presentation

Mar 16, 2023 141 likes •194 views

Gridded Window Testing Al Moretti, M. Alsharoa ; IIT and Muonsinc. 1 Outline Slides 3 and 4 are from the work of Mohamed Alsharoa formally of IIT and Muonsinc Inc. Slide 3 shows the possible patterns of the grids or grill. Slide 4

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SLIDE 1

Gridded Window Testing Al Moretti, M. Alsharoa ; IIT and Muonsinc.

1

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SLIDE 2

Outline

  • Slides 3 and 4 are from the work of Mohamed Alsharoa

formally of IIT and Muonsinc Inc.

  • Slide 3 shows the possible patterns of the grids or grill.
  • Slide 4 shows Ansys calculation of the electric field gradient.
  • Describe a ideal that may suppress breakdow in a magnetic

field.

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SLIDE 3
  • Design variables:
  • tube outer diameter, tube wall thickness
  • number of tubes and grids
  • grid spacing
  • type of coolant and coolant flow rate
  • grid configuration:

physically and electrically connected grids

  • r plane grid (waffle grid)
  • The cavity model contains a Be-window from one side and a gridded-tube structure

from the other side that was built in place of the other Be- window at the same location.

  • To reduce the computation time, quarter of cavity is considered, and the tubes are

represented as solid cylinders for the modal analysis for solving for E and H fields.

  • Fig. 1.c Description of the model
  • Fig. 1.b connected grids

Fig.1.b waffle grid

  • Fig. 1a Cross-sectional view of the closed-cell 805 MHz test cavity
  • I. DESCRIPTION OF THE CLOSED CELL 805 MHZ

TEST CAVITY

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SLIDE 4
  • Fig. 12 Contour plot of the magnitude of

the electric field

  • Fig. 13 Contour plot of the magnitude of the magnetic field

 E max at the tube surface/E max at the center of the cavity (tubes field enhancement) = 1.8

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SLIDE 5

Discussion of Idea the Gridded Window Suppress Breakdown

  • The grids minimize the surface area subjected to the high

gradient.

  • If the grids are rotated 90 Deg. to each other, the surface area

is reduced even more.

  • The RF electric and magnetic field pattern is also different

which could effect the focusing efficiency of the DC magnetic field.

  • This technique works to prevent multipactor in klystrons. It is

called castelating.

  • The aluminum gridded window have been already made.
  • So I think it should be test at very end of this run.

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