Preliminary design of a 30 MeV deuteron linear accelerator for the production of intense beams of 14 MeV neutrons Page: 3 of 5
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TABLE if-BASIC CAVITY PARAMETERS
CAVITY" 1 2 3 4 5 6 7 6INPUT ENERGY IIUvI
INPUT Or
OUTPUT ENEROYlYW)
OUTPUT y
CAVITY OIA. (w)
CAVITY LENGTH (a)
INPUT CELL LENGTH I
OUTPUT CELL LENGTHIIS
MUT GAP/LENGTH
RATIO (t)0.700 3.917 7m 11232 M049 ali 22414 2S
0ts C.063 co 0.106 0.125 0 0355 005
5.67 7772 11.72 15.04 HI56 22J44 26226 30106
0063 0.08 0.109 012$ 0.3 0.155 OA 0.177
7 376 37m am O a .7 s .n 7 y a
4162 SMS 4.773 4.9M 4.74 53 44 5178
0.1359 0260 0547 .061 0761 04" 0704 LOOT
037 0302 0247 0.77 O3 0150 Q16 1067
om am .m 0275 0260 a* 0.19 0OUTPUT GAP/LENGTH 0.234 0A7 0275 0.20 0301 0.06 0.310 030
RATID (J
MIPUT DRftj TE LENGTH 0.10 o2 ot 04O O. O54 ce o 0.67
OUTPUT OMIT E LEUG 02M 0.55 0.470 0132 0.32 0.0e 000 0.6
DIFT TIME D0fhTER(m) 0.720 0.720 0720 0720 arAD 0750 0.720 0720
OET TI APERntA (m) 0040 0060 0.060 0060 0060 0090 0050 COlD
DRIFT TUBE ENR 0040 0.040 0040 0.040 0040 0040 0040 0040
COmES RACRIS OS)
DRIFT TIME OUTER 0O5 00 00 m 000 aO 000 Q O
CONE R RAMlS Is)
WElT TURE STEM SIG QU OS 0050N 0050 0040 050 0060 000
QUAD. APERTURE (w) 0050 0070 00 000 GD0 0060 05050
QUAD. LENGTH (m) 0100 0200 020 0400 0.400 0400 0.400 0400
QUAD. IELD SINGTH ~6.00 -030 -0.25 -025 ~025-02 0.5-025
(to /em)
The 66 copper drift tubes mounted on the axis of
the accelerator will each contain a dc, water-cooled,
electromagnetic quadrupole. The drift tubes have a
single support stem, we do not contemplate utilizing
"stem couplers", posts or multistems to equalize the E
field distribution, because each cavity is very short,
less than one wavelength. The drift tubes and the
tanks will demand an efficient water-cooling system to
dissipate the - 1.5 MW of excitation power and main-
tain a constant temperature. The accelerator will op-
erate at about 1000F, and the cavity resonant frequen-
cies will be maintained and adjusted by means of a
servo system controlling the operating mean temperature.
This scheme is being successfully used presently on the
Brookhaven proton linac.
Radiation damage considerations dictate that the
accelerator be built excluding all organic materials.
Rubber hoses, vacuum viton seale, electrical organic
insulation, etc., will all be replaced by radiation
hardened materials. Although these are design con-
straints, today, radiation hardening is becoming stan-
dard procedure in new accelerator designs and the tech-
nology is well developed. It is however, raising the
machine cost, especially when one has to decide on
the seals of vacuum valves.
The vacuum system requirementseare a clean system
with an operating pressure of 10-' torr. The high vacu-
um will be maintained with the help of ion pumps, these
are now well understood, reliable and practically main-
tenance free. The roughing system however presents a
problem because of the large volume to be evacuated in
a reasonable time. The logical approach here is the
use of cryogenic pumping where high pumping speeds can
be achieved at reasonable cost. Although it is intend-
ed to operate the accelerator at 10'- torr, the liquid
lithium target will operate in the 1 torr region, this
will necessitate very efficient differential pumping
in the beam transport system. The 1 torr pressure at
the target is predicated upon the vapor pressure of
lithium at the operating temperature which will reach900-100OF.
Radiofrequency System
The basic radiofrequency parameters are given in
Table III and the proposed radiofrequency power supply
system is shown in Fig. 2. Each cavity section will be
TABLE M - RADIO FREQUENCY PARAMETERS
CAITT I 2 5 4 a a 7 a
STOM E M WAI 9032 96 a 5 91.92 9.66 e00.05 61.2 1010
AVERAGE 3HUNf 12.0 305 3.0 362 36.9 Si 30 47
IMPEDANCE (IMAA)
TOTaL CAVITY PWRIKW) 206. 0.6 76 e10 161! 1777 161.6 176.0
TOTAL sEAM PWR POe 54.7 300 ae0.0 set6 30s W7s 31l2 s9.s
CAMA (KWI
UNLOADED 0 VALE 157 0 O I TIM nM400 (500 US1S0 I3060
sVUT TRANIT TIME 0.63 0200 0.646 0810 0.5 0*1 0.0 o.7e
OUTPUT TRASIT TaE 02? 0.142 015 0815 0.92 0106 0.799 0.760
STAB.E PHASE ANGLE 30 30' 30" S 0" 30" 0O ST 30ACCLQaTmS CAVItY ACCEL.TAILS CAVIT,
..er N.., . g.
ma U- -" 4.
.[,.r. . 0.1-
r a, ru --a . Am..
" c 6- s e "e
'" flf. e.
"w ,......j "
AS O # - aC aS.T -
fed by a drive chain fed from a master reference line
and phase locked to it. Each of the 8 drive chains will
have an output capability of 600-900 kW average power
thus providing for acceleration of beam currents of 100
mA for both D and D' beams. Phase control will be af-
fected in the low level stages of the drive system with
comparison being made between accelerating cavity sec-
tion and the reference line. The final amplifier will
probably be drive modulated to allow for radiofrequency
amplitude control. An S.C.R. controlled power supply
at a voltage of - 20 kV and a current of ~ 60 A will be
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Batchelor, K.; Chasman, R.; Fewell, N.; Grand, P.; Lankshear, R.; Sheehan, J. et al. Preliminary design of a 30 MeV deuteron linear accelerator for the production of intense beams of 14 MeV neutrons, article, January 1, 1975; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc1021486/m1/3/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.