45
length (in.) 32
thickness: tapered from 1.4 to 0.06 in.
weight (lb) 500
vibrational frequency (cps) 64
electrical capacitance ([mu][mu]f) 300 to 6,500
peak-to-peak excursion (in.) 1
minimum separation of blade and stator (mils) 50

Protons Deuterons Alpha particles
------- --------- ---------------
frequency sweep (Mc) 36-18 18-13.5 18-13.5

Ion source: conventional open-arc type

_Beam extractor_

LeCouteur-type regenerator combined with magnetic channel

_Building and facilities_

Room dimensions
diameter (ft) 160
height (ft) 90

Crane
type: radial
capacity (tons) 30
overhead span (ft) 77

Concrete shielding: 15 ft thick on sides, 4 ft on top

_History_

Design started: January 1940.
Construction started: August 1940.
First operation
for deuterons and alpha particles: November 1946.
for protons: December 1948.
Rebuilt: 1955-1957.

[Illustration: Synchrocyclotron Building]

[Transcriber's Note:
The following changes have been made to the printed text:
Page 15, added closing quote (are called "caves" because)
Page 19, "iostopes" corrected to "isotopes" ]

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