ID: 3635 Progress on Design and Construction of MICE Coupling Solenoid Magnets

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15 Νοε 2013 (πριν από 3 χρόνια και 6 μήνες)

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ID: 3635

Progress on Design and Construction of MICE Coupling Solenoid Magnets


Presenter
: Li Wang (ICST, Harbin)

Authors
: Li Wang, XingLong Guo, Heng Pan, Hong Wu, Shi Xian Zheng (ICST, Harbin),

SuYan Li (HUST, Harbin),

Allan J. DeMello, Michael Green, De
run Li, Steve Virostek, and Michael Zisman

(LBNL, Berkeley, California)


Abstract
A pair of superconducting coupling solenoids are to be applied in the Muon Ionization
Cooling Experiment (MICE). The solenoid made of commercial copper stabilized niobium
t
itanium conductors has an inner diameter of 1.5 meter, a length of 285 mm and a thickness of
106 mm It is to provide a central field of about 2.6 T at full current of 210 A, and the coil peak
field up to 7.4 T. The coupling magnet will be cooled by two cry
o
-
coolers with total cooling
capacity of 3.0 W at 4.2 K, and powered by a single 300 A power supply through a pair of binary
leads. The magnet is to be passively protected by cold diodes and resistors across sections of coil
and by quench back from the 606
1 Al mandrel in order to lower the quench voltages and the hot
spot temperature. The engineering design and construction of the MICE coupling magnets were
carried out by the Institute of Cryogenics and Superconductivity Technology in Harbin Institute
of Te
chnology in collaboration with the Lawrence Berkeley National Laboratory. This paper is to
present the updated engineering design and the fabrication processing technique for the magnets.


Funding Agency
: This work is supported by funds of cryogenics and s
uperconducting technology
innovation project under HIT 985
-
2 plan, and by the Office of Science, US
-
DOE under DOE contract DE
-
AC02
-
05CH11231.


Type of Presentation:



Poster

Main Classification:



07 Accelerator Technology

Sub Classification:



T10 Supe
rconducting Magnets


ID: 2472

Lessons Learned for the MICE Coupling Solenoid from the

MICE Spectrometer Solenoid


Presenter
: Michael Green (LBNL, Berkeley, California)

Authors:

Michael Green, Allan J. DeMello, Derun Li, Frederick Trillaud, Steve Virostek,

Michael Zisman
(LBNL, Berkeley, California),

XingLong Guo, Heng Pan, Li Wang, Hong Wu, Shi Xian Zheng (ICST, Harbin)


Abstract:
Tests of the spectrometer solenoids have taught us some important lessons. The spectrometer
magnet lessons learned fall into t
wo broad categories that involve the two stages of the coolers that are used
to cool the magnets. On the first spectrometer magnet, the problems were centered on the connection of the
cooler 2nd
-
stage to the magnet cold mass. On the second spectrometer mag
net, the problems were centered
on the cooler 1st
-
stage temperature and the connections between leads, the cold mass support intercept, and
the shields to the cooler first
-
stage. If the cooler 1st
-
stage temperature is too high, the refrigerator will not
pr
oduce full 2nd stage cooling. If the 1st
-
stage temperature is too high, the temperature of the top of the
HTS leads. As a result, more heat goes into the 4 K cold mass and the temperature margin of the top of the
HTS leads is too small, which are in a magn
etic field. The parameters that affect the magnet cooling are
compared for the MICE coupling magnet and the spectrometer magnet.


Funding Agency
: This work is supported by funds of cryogenics and superconducting technology
innovation project under HIT 985
-
2 plan, and by the Office of Science, US
-
DOE under DOE contract DE
-
AC02
-
05CH11231.


Type of Presentation:



Poster

Main Classification:



07 Accelerator Technology

Sub Classification
:


T10 Superconducting Magnets


ID: 2507

Fabrication, Testing and Mode
ling of the MICE

Superconducting Spectrometer Solenoids


Presenter
: Steve Virostek (LBNL, Berkeley, California)

Authors
: Steve Virostek, Michael Green, Frederick Trillaud, Michael Zisman

(LBNL, Berkeley, California)


Abstract:

The Muon Ionization Cooling

Experiment (MICE), an international collaboration sited at
Rutherford Appleton Laboratory (RAL) in the UK, will demonstrate ionization cooling in a section of a
realistic cooling channel using a muon beam. A five
-
coil superconducting spectrometer solenoid

magnet
will provide a 4 tesla uniform field region at each end of the cooling channel. Scintillating fiber trackers
within the 400 mm diameter magnet bore tubes measure the emittance of the beam as it enters and exits the
cooling channel. Each of the iden
tical 3 meter long magnets incorporates a three
-
coil spectrometer magnet
section and a two
-
coil section that matches the solenoid uniform field into the MICE cooling channel. The
cold mass, radiation shield and leads are kept cold by means of three two
-
sta
ge cryocoolers and one single
-
stage cryocooler. After incorporating several design changes to improve the magnet cooling and reliability,
the fabrication and acceptance testing of the spectrometer solenoids has been completed. The key features
of the spect
rometer solenoid magnets are presented along with the details of a finite element model used to
predict the thermal performance of the magnets.


Funding Agency:

This work is supported by the Office of Science, United States Department of Energy
under DOE c
ontract DE
-
AC02
-
05CH11231.


Type of Presentation:


Poster

Main Classification:


07 Accelerator Technology

Sub Classification:


T10 Superconducting Magnets