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 -.'l /9i.4 
 
 MDDC - 964 
 
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 UNITED STATES 
 
 ATOMIC ENERGY COMMISSION 
 
 OAK RIDGE 
 
 TENNESSEE 
 
 184" CYCLOTRON 
 
 Oscillator Capacitance Measurements 
 
 by 
 
 R. L, Anderson 
 
 Published for use within the Atomic Energy Commission. Inquiries for additional copies 
 and any questions regarding reproduction by recipients of this document may be referred 
 to the Documents Distribution Subsection, Publication Section, Technical Information 
 Branch, Atomic Energy Commission, P. O. Box E, Oak Ridge, Teimessee. 
 
 Inasmuch as a declassified document may differ materially from the original classified 
 document by reason of deletions necessary to accomplish declassification, this copy does 
 not constitute authority for declassification of classified copies of a similar document 
 which may bear the same title and authors. 
 
 Date of Manuscript: March 18, 1947 
 Document Declassified: May 23, 1947 
 This document consists of 1 page. 
 
Digitized by the Internet Archive 
 
 in 2011 with funding from 
 
 University of Florida, George A. Smathers Libraries with support from LYRASIS and theSlaan Foundation 
 
 http://www.archive.org/details/184cyclotronosci00usat 
 
- 1 - MDDC - 964 
 
 184" CYCLOTRON 
 Oscillator Capacitance Measurements 
 
 By R. L. Anderson 
 Experiment done by R. L. Anderson and J. Riedel 
 
 Introduction 
 
 Capacity of the oscillator plate to ground was requested by Mr. Pote', electrical en- 
 gineer at Harvard University. It was also desirable to have this information for comparison 
 with model measurements and for the records. 
 
 Experimental Setup: 
 
 The oscillator housing was separated from the transmission line housing, and the 
 oscillator plate coupling'loop was disconnected at its grounded end. The water lines run- 
 ning through the loop were disconnected at their entrance into the loop. The G-R imped- 
 ance bridge leads were connected to the 9C21 tube water jacket and to the oscillator 
 housii^. For accuracy an oscilloscope was used in balancing the bridge. (Oscillator wiring 
 diagram, Dwg.#2L2754) . 
 
 Results: 
 
 The plate to ground capacity with coupling loop disconnected was 113 jufii. The plate to 
 ground capacity with coupling loop disconnected and two 50/i//f vacuum capacitors added 
 as in normal rim condition was 219////f. The grid circuit contains 15 - 50 ^f vacuum 
 capacitors in parallel (calculated) - 750 /U^f. The filament circuit contains 10 - 50jufif 
 vacuum capacitors in parallel (calculated) - 500 fifii. It was not deemed necessary to meas- 
 ure the grid or filament circuits. The measurements were made with G-R Impedance 
 Bridge, T3rpe 650-A Serial #1977, and are + 2/M//f. Lead capacity of 29 f/fit has already 
 been deducted. 
 
UNIVERSITY OF FLORIDA 
 
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