=
_13—2.
THE CYCLOTRON
.
295
à
V1, although diicult to estimate, ranges
10 to‘100 KV.
,
in practice, and 71 varies from 25 to 400.
.
Protons are accelerated to an energy (V) of 2 Mev when r = 16
centimeters, H = 13 kilogauss and )\ = 15.meters. Estimating
a peak oscillator voltage of 10 KV., the peak ions made 100
'
,
tions (71) and the amplication (2%) was 200. For 6.8 Mev
deuterons, H = 18 kilogauss, >\ = 22 meters, r'= 30 centimeters
«
and, assuming V1 = 100 Kv., n = 34 and A’ = 68. The lighter
the ion, the shorter the wave-length required for a given magnetic
eld and outer radius.
The resonance conditions for singly
charged deuterons are the same as for doubly charged helium
—
nüclei (alpha particles) since both the charge and»the mass of
the latter are twiceas great as the former.
,
EXHAUST
DÊFLECTOR
Ï
‘
“
\
PLATE
|!
H_}
"
_
|!
l
\
°
,
|!
|
‘ ,
:Èm
=
*
||
,|
'
—I-m
.
,
3
,
_
FIG. 13—3.3
cvclotroh.. TOP
.
An ion
when
the applied
peak value
require the same
time to travel 1nahalfc1rcleasthose at the peak and3'w—ill,
_
_
fore> recelvemultlplereswanceacceleratwns The ions which
'
,
receive a£smalleracceleraonateachhalfcycle must execute
more