I OFI
ORNL
P 1511
-
-
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II
.
.
111922
MICROCOPY RESOLUTION TEST CHART
NATIONAL BUREAU OF STANDARDS - 1963
i
PORN Pino B12-13
OCT 26 1965
.
-
DCX-2 BEAM INJECTION DUCT*
R. L. Brown, P. R. Bell, J. C. Culver
.
*
The magnetically shielded duct (snout) through which the molecular-
3.on beam is injected into DCX-2 has the rather severe requirement that
it shield the internal channel from an external magnetic field of 12
kilogauss while disturbing the very uniform external field to a neg-
-
1
ligible degree.Engineering aspects of the latest model snout will be
de
presented.
The cut-away view of DCX-2 (Fig. 1) shows the snout in its proper
position. The schematic (Fig. 2) shows the desired field shape. A

ferromagnetic hollow cylinder would reduce the field in the duct
!CHKENT
sufficiently but would distort the external field seriously. A cosine
winding produces a field in the direction opposite to that of the
IN NUCLEAR SCIEACE 1:25TXACTS
external field. This corrector coil accurately restores the external
REISASED FOR D
field to the desired shape.
A detailed cross section of the snout is shown in Fig. 3. Hiperco
(a high-permeability material composed of 70% iron and 30% cobalt) not
only shields the injection duct magnetically but also provides a
structural support for the correcting coils. Abnormal magnetic forces
will result if trouble occurs in the surrounding coils or in the main

field coils. The Hiperco was machined on an automatic coded milling.
3
* Research sponsored by the U. S. Atomic Energy Commission under
contract with Union Carbide Corporation.
Thermonuclear Proj. Semiann. Progr. Rept. July 31, 1960, ORNL-
3011; Thermonuclear Div. Semiann. Progr. Rept. Jan. 31, 1961, ORNL-3101
Thermonuclear Div. Semiann. Progr. Rept. Oct. 31, 1961, ORNL-3239;
Thermonuclear Div. Semiann. Progr. Rept. Apr. 30, 1962, ORNL-3315; P. :
Bell et al., Engineering Features of DCX-2, ORNL-3325 (July 12, 1963).
LEGAL NOTICE
The report wwpropered u u socont of Governot spoonored work. Nedober the United
pornon acting on behalf of the Commission:
A. Make money or reprenabadon, aprend or supue, with ropect to the LCCU-
moy, completeness, or watelses of the tailormation contadud ta thulo roport, or that the use
of my tafortation, appenatu, method, or proceso declound in the report may not latringa
Hatua, nor the conteston, nor w
my lastuta vita neprot to the wo of, or for damage results from the
Nowed to do sboro, "person settes on behalf of the Commuteetan" includes kay on-
woofery beforation, apparat, method, or proones dileclound ta the report,
Plague of contractor of the counteddon, or ansioyo. of much contractor, to the extent that
toleration permuual to No aplogracat or contract
no aploys of contractor of the Commission, or uployee of such contractor properts,
ploguiat vith racha contractor.
donnantes, or pronto socou to, u
sta the Counterton, or Me
s
D.
A

Jo imported

NOF APPROVED-FOR PUBLIC RELEASE: AVAILABLE
TO THE ACAD. ITS COTERACTORS ONLY.
wnion
-
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-2.
biw-*
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n
machine (see Figs. i an! 5). This intricate machining was performed to
match the shape of the transverse corrector coil, which is formed
to fit the lands in the Hiperco as shown in Fig. 6.
The transverse corrector coil (Fig. 7) almost exactly counteracts
the magnetic distortion created by the Hiperco. Turns of varying length
compensate for the varying field strength entering transverse to the
axis of the injection duct.? Water path lengths were adjusted to be
approximately the same in each of the four water circuits. For most
animanta
A
en kaltet stavanotarat kargentin at -
turns the conductors have been reduced to one-half size at the end
of the Hiperco because of the very limited amount of space available and
kitaalin
the need for getting around the hole forming the injection duct.
A helical corrector coil is wound around the transverse corrector
ada dalam
coil to compensate for a field component parallel to the axis of the
n
snout. The helical corrector coil consists of three major parts (Fig. 8).
h
masi
The upper part is separated from the lower parts to make room for the
mechanical support.
ado..wow
n
The middle part terminates into a bus that connects
to the lower part, which consists of four smaller segments connected
.co.us.r
o, kad nebenaran da
electrically and hydraulically in parallel. From Fig. 8 it can be
seen that the ampere turns per inch vary along the length of the coil
o.
moto charitatis, akkoodatuke kita k
because of the varying magnetic field that the coil must produce.
o. Ainder
The field to be canceled 18 shown in Fig. 9 along with the actual measured
field of the coil without the presence of the Hiperco. Find adjustments
were made by shifting individual turns up or down the axis until the best
fit was obtained. The coil was potted in glass-cloth-reinforced epoxy
to hold turn positions and provide structural strength.
mense.
L. J. Bledsoe, Calculations for Redesign of Snout Transverse Field
Shielding Coil, DCX-2 Technical Memorandum No. 101 (Dec. 17, 1962).
SL. J. Bledsoe; C. E. Parker, and P. A. Thompson, Snout Region Field
Calculations, DCX-2 Technical Memorandum No 100 (Nov. 1, 1962).
.
-3-
The dip observed between the upper and middle sections is due to the gap
in the coil required for the mechanical support. Fortunately the field
strength at this position is not high enough to saturate the Hiperco,
and no transverse field penetration occurs. By adding a mirror image
of the field at the end of the coil to the measured field, an approx-
Hiperco, which exactly matches the desired field.
A view of both coils mounted on the Hiperco 18 shown in Fig. 10.
The completely assembled snout is shown in Figs. 11 and 12. Magnetic
measurements of the completed snout after installation in DCX-2
are shown in Figs. 13 and 14.4 Good shielding of the beam from the
12-kilogauss external field is obtained, and no evidence of disturbance
of the main plasms by residual external field has been noted. Pertinent
specification data are shown in Table 1.
.
.
44
.
Y
"0. B. Morgan and R. C. Davis, DCX-2 Data Supplement (June 5, 1964).
FIGURE CAPTIONS
Fig. 1.
Fig. 2.
Fig. 3.
Fig. 4.
Fig.
Fig. 6.
ܨ ܩܼܿ ܪ
.--..
-
DCX-2.
DCX-2 Ion Injection Duct "Snout:
Cross Section DCX-2 Snout.
End View of Hiperco.
Hiperco.
Hiperco & Transverse Corrector Coil.
Transverse Corrector Coil,
Helical Corrector Coils.
Helical Corrector Coils B. vs. S..
Coils Assembled on Hiperco.
Completely Assembled Snout. View looking north.
Completely Assembled Snout. View looking south,
Transverse Magnetic Field in New Snout.
Axial Magnetic Field in New Snout.
Fig. 7.
Fig: 8.
Fig. 9.
Fig. 10.
Fig. 11.
Fig. 12.
Fig. 13.
Fig. 14.
8
TABLE CAPTION
Table 1.
Snout Coil Specifications
.
>
M.
Table 1. Snout Coil Specifications
Transverse Coil
Helical Coil
.
I = 6930
Itot = 6930 amp (0.036 Itot goes through
parallel shunt)
V = 24 v
V = 9.6 v
P = 166 kw
P = 67 kw
N = 14 turns
N, = 26 turns at I = 6680 amp
: Q = 29 gpm water
N, = 20 turns at I = 1336 amp
Ap = 180 psi pressure drop
Q = 8.9 gpm
At = 35°C maximum ambient water temperature
At = 30°C ambient water temperature

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ORAL-DWG 64 -41798
-1 = 6930 MEASURED
kilogauss)
CALCULATED FIELD
8
1 = 6680 MEASURED
(3.6 % SHUNTED)-
1 = 6930 CALCULATED
FIELD REQUIRED
_MAGE FIELD ADDED
TO MEASURED FIELD
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UPPER HELICAL
COIL
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TIP OF
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0
100
200
300
400
gauss
kilogguss
8
12
15

ORNL-DWG 64-11800

0 0-300 gauss
lo--- 0-3 kilogouts -
!
...
=
PHELICAL
COIL
>
--
l
inches
F
rometnimi **
00000000cocoogee
:-
*
TTT
lllIIIIIIIIIIIIIIIIIIII
HELICAL
COIL
SNOUT
TRANSVERSE
COIL
00000
TIP OF
COPPER CAN
-1000
200
300
'-
100
gauss
kilogouss
.
.
.
i
rr
.
.
.
4
4
44
)
4
END
-
-
-
E
-
Li.
DATE FILMED
11/18/65






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