Crack Parameters

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One of the important variables in the design of the end cap calorimeter is the number of angular divisions that should be made in the face of the calorimeter array. While it would be ideal to have no such divisions, they are unavoidable because the maximum size for uranium sheets is less than the diameter of the array. These divisions create regions which are either partially or totally devoid of absorber and readout. It is the purpose of this note to analyze the effects of different parameters on the size of these cracks. This analysis assumes wedge shaped structures of ... continued below

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4 pages

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Pitas, A. October 31, 1985.

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Description

One of the important variables in the design of the end cap calorimeter is the number of angular divisions that should be made in the face of the calorimeter array. While it would be ideal to have no such divisions, they are unavoidable because the maximum size for uranium sheets is less than the diameter of the array. These divisions create regions which are either partially or totally devoid of absorber and readout. It is the purpose of this note to analyze the effects of different parameters on the size of these cracks. This analysis assumes wedge shaped structures of significant depth (i.e. > 20% of the total depth). For such modules there are five variables which affect the size of a crack. They are: (1) The clearance between modules. The extent to which the module wall and the array extend into this region depends on the tolerances on the manufacture of the module. All of the module construction techniques currently under consideration have very tight tolerances (e.g. 2 mils). Therefore, this region is assumed to be void of solid material. In the C.C this region is thought to be .090 inches wide. (2) The thickness of the module walls. The wall thickness depends on which module is discussed. Design thicknesses range from .078 inches in the C.C. modules to .150 inches in the E.C leakage modules. Because tight tolerances are assumed on the construction of the modules the skin is assumed to be perfectly flat. (3) The dimension tolerance on the uranium width. The effect of the dimension tolerance varies depending on the location of the module. Modules near the a o'clock and 9 o'clock position will see a gray zone equal to the dimension tolerance at the top of each module. There will be a solid black zone at the bottom of each module. This results from gravity pulling the uranium plates down to touch the lower wall of the module. Modules near the 6 o'clock and 12 o'clock region will see a gray zone equal to the dimension tolerance at both edges of a module since there are no plans for a mechanism to insure their alignment along one wall. (4) The straightness tolerance on the plate edges. The straightness tolerance creates a gray zone equal to its width along each side of a module. (5) The region of reduced signal pickup. The extent of this region is not yet well understood. The current design requires an area along the edge of the module which does not have resistive coat. The width of this region has not been determined. Some portion of this region should still collect all of the signal. The size of this region is not known, either. As an example we can use the tolerances currently achieved for the Harvard plates at Rocky Flats. The width tolerance requested was +0.000, -0.020 inches. Rocky Flats is delivering plates with a width tolerance of +0.000, -0.040 inch. There is no tolerance on the straightness of the datum edge. If we assume that .010 inch of the .040 inch tolerance is do to straightness variation then we can determine the crack sizes for a C.C. E.M. module.

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4 pages

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  • Report No.: FERMILAB-D0-EN-030
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/1030022 | External Link
  • Office of Scientific & Technical Information Report Number: 1030022
  • Archival Resource Key: ark:/67531/metadc845635

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • October 31, 1985

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

Description Last Updated

  • Aug. 30, 2016, 4:01 p.m.

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Pitas, A. Crack Parameters, report, October 31, 1985; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc845635/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.