Fabrication and test of short helical solenoid model based on YBCO tape Page: 1 of 4
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FABRICATION AND TEST OF SHORT HELICAL SOLENOID MODEL
BASED ON YBCO TAPE*
M. Yu#, V. Lombardo, M.L. Lopes, D. Turrioni, A.V Zlobin, Fermilab, IL 60510, U.S.A.
G. Flanagan, R.P. Johnson, Muons Inc., Batavia, IL 60510, U.S.A.
A helical cooling channel (HCC) is a new technique
proposed for six-dimensional (6D) cooling of muon
beams. To achieve the optimal cooling rate, the high field
section of HCC need to be developed, which suggests
using High Temperature Superconductors (HTS). This
paper updates the parameters of a YBCO based helical
solenoid (HS) model, describes the fabrication of HS
segments (double-pancake units) and the assembly of six-
coil short HS model with two dummy cavity insertions.
Three HS segments and the six-coil short model were
tested. The results are presented and discussed.
A HCC has been proposed for 6D cooling of muon
beams . It is based on a continuous absorber and RF
cavities imbedded into superconducting magnets which
superimpose solenoid, helical dipole and helical gradient
field components. The HCC for muon collider is divided
into several sections, each section with progressively
stronger fields, smaller aperture and shorter helix to
achieve the optimal muon cooling rate .
To study and demonstrate the HCC low-field section,
two four-coil HS models based on NbTi Rutherford-type
cable were designed, fabricated  and tested  at
Fermilab. The HCC high-field section, due to its high
operation conditions, requires using coils based on High
Temperature Superconductors (HTS) . Furthermore,
the RF cavities inside the coil are required to operate at
the temperatures above 30 K (assuming gaseous H2 is
used as the absorber), and there will be very little space to
fit the thermal insulation and support structure in between
the RF system and the magnets. The use of HTS can solve
this problem by allowing the operation of both the
magnets and RF system at the same temperature.
Therefore, development of the design and fabrication
technology of a high-field HS based on HTS material is
critical for realizing a practical HCC. HTS coils based on
the present practical HTS materials Bi-2212 wire and
YBCO tape were studied and compared. YBCO tape was
selected as the conductor for the model due to its better
mechanical properties, compared with Bi-2212 wire -
. Besides, the present YBCO tape, provided by
Superpower, has better Ic performance than Bi-2212 wire
*Work supported in part by USDOE STTR Grant DE-FG02-
07ER84825 and by Fermi Research Alliance, LLC, under contract No.
DE-AC02-07CH11359 with the U.S. Department of Energy.
at both 4.2 K and 33 K.
* Slot 1c
Inner Splice Slot
'mm 78 mm 16 mm
Figure 1: A double-pancake unit.
Figure 1 shows the assembled mechanical structure of a
double-pancake unit with dimensions. Such design allows
assembling all the units into a longer helical solenoid by
replacing one side flange with a connecting flange which
accommodates the splices between units. Moreover, the
modular structure of HS also allows providing a gap
between two units to insert cavities and absorber feed
The target design parameters for the high field section
of HCC were listed in . To reach the required field
components, a continuous HS without any insertions
should consist of at least 24 double-pancake units. An HS
with a cavity system insertion between two double-
pancake units requires some adjustment to the design
parameters to meet the field requirement, but the
mechanical concept of HS with the cavity is the same.
Conceptual design studies were performed using
individual double-pancake units; 3- double-pancake units
combined into a continuous assembly; and double-
pancake units with G10 dummy cavities insertions in
between the units. SCS12050 Superpower YBCO tape
with a nominal Ic(0T,77K) = 330 A was used as the
conductor for the studies as well as for the fabricated
double pancake coils. Table 1 shows the parameters of the
models predicted performance at 4.2 K.
Table 1: HS Short Models Parameters
Number of Double-pancake Units
Parameter Unit (Number of Cavity Insertion)
1(0) 3(0) 3(2)
Coil ID m 0.10 0.10 0.10
Coil OD m 0.116 0.116 0.116
Number of 58 58 58
Predicted IQuench kA 1.424 1.348 1.375
Maximum Coil T 3.4 3.7 3.6
B - Field
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Yu, M.; Lombardo, V.; Lopes, M. L.; Turrioni, D.; Zlobin, A. V.; Flanagan, G. et al. Fabrication and test of short helical solenoid model based on YBCO tape, article, March 1, 2011; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc833478/m1/1/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.