30lun*4fi MDDC - 1051 
 
 UNITED STATES 
 ATOMIC ENERGY COMMISSION 
 OAK RIDGE 
 
 TENNESSEE 
 
 184" CYCLOTRON 
 VERTICAL D. C. ELECTROSTATIC DEFLECTOR 
 
 by 
 
 Duane Sewell 
 
 Pxiblished 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 Technical Information Division, Atomic Energy Commission, P. O. Box E, 
 Oak Ridge, Tennessee. 
 
 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: February 18, 1947 
 Document Declassified: June 10, 1947 
 This document consists of 2 pages. 
 
1 - MDDC - 1051 
 
 184" CYCLOTRON 
 VERTICAL D. C. ELECTROSTATIC DEFLECTOR 
 
 By Duane Sewell 
 
 Experiment done by: J. Vale, L. Houser, R. Watt, W. Chupp, 
 A. Reyenga, and W. Grimshaw 
 
 INTRODUCTION 
 
 It was found from previous experiments that the beam was rapidly spreading verti- 
 cally at approximately the 81" radius. It was thought that if a vertical deflector was 
 placed below the median plane at this 81" radius, the beam could then expand into the 
 deflecting channel. Once in the deflecting channel it could then be deflected rapidly into a 
 region in which a magnetic shield (or deflector) could be used to bring the beam out of the 
 cyclotron. 
 
 RESULTS 
 
 1. Approximately 60 kv could be held on the high voltage electrode of this deflector. 
 
 2. On one occasion it looked as if an ionization chamber mounted on the probe was detect- 
 ing a small deflection of the beam. However, this could not be verified on subsequent 
 runs. 
 
 3. The best detection of the beam deflection was made by mounting X-ray film on the probe 
 and exposing it to both the undeflected and deflected beam. 
 
 4. There was considerable sparking between the HV electrode and the .002" copper foil. 
 The copper foil was warped badly when the deflector was removed; this had apparently 
 been caused by the local heating from the sparking. The 0.002" copper foil supported 
 in this manner is hot suitable for this job. 
 
 5. The copper foil was very radioactive after a short run. 
 
MDDC - 1051 
 
 EXPERIMENTAL SET UP: 
 
 TANK 
 
 SPS^^ i*£ 
 
 PHOTOGRAPHIC FILM 
 PLACED ON PROBE 
 APPROX. 12^' FROM 
 END OF DEFLECTOR 
 
 <^ OF GAP 
 
 .002" COPPER FOIL 
 
 20 MEG 
 RESISTOR 
 
 81" RADIUS 
 
 SECTION AA 
 
 Figure 1 
 
 184'''' CYCLOTRON 
 VERTICAL D. C. ELECTROSTATIC DEFLECTOR 
 
UNIVERSITY OF FLORIDA 
 
 3 1262 08909 7652