Superconducting superferric dipole magnet with cold iron core for the VLHC Page: 1 of 5
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
Fermilab FERMILAB-Conf-01/383-T December 2001
Superconducting Superferric Dipole Magnet
with Cold Iron Core for the VLHC
G. W. Foster, V.S. KashikhinAbstract-- The magnet system of the Very Large Hadron
Collider (VLHC) Stage I is based on a superconducting 2 Tesla
magnetic field combined function magnets. These magnets will
have a room temperature iron core with two 20 mm air gaps.
Magnetic field in both horizontally separated air gaps is excited
by a single turn 100 kA superconducting transmission line.
The alternative design with cold iron core, horizontally or
vertically separated air gaps is under investigation. The cold
iron option with horizontally separated air gaps reduces the
amount of iron, which is one of the main cost driver for 233 km
length magnet system of the future accelerator. The vertical
beam separation decreases volume superconductor, heat load
from synchrotron radiation and eliminates fringing field from a
return bus. But the horizontal beam separation has lowest
volume of iron core and as a result lower heat load for
cryosystem during cooling down. All these options are discussed
and comparison is made. Superconducting correction system,
combined with the magnet, allowing to increase the maximum
field is also under discussion. Preliminary cost analysis are made
for all options.
Index Terms-Accelerator magnets, Cold Iron, Cost,
Superconducting magnets, Superferric, VLHC.
L INTRODUCTION
T HE Very Large Hadron Collider (VLHC) Design Study
was performed in Fermilab [1]. The staged scenario of
this machine decreases the total project cost and provides a
shallower funding profile. The major cost driver for collider
is the civil construction cost. Magnet system is the second
cost driver. The Stage I VLHC is based on the
superconducting 2 Tesla transmission line magnets [2].
These combined function superconducting magnets cost only
900 $/T-m [1] and provides essential cost savings.
It is well known other types of superconducting magnets
generating magnetic fields in the range of 2 - 6 Tesla with
very high efficiency [3] - [5]. Most of them have the cold
Manuscript received September 24, 2001.
G. W. Foster is with the Fermi National Accelerator Laboratory, Batavia,
IL 60510 , USA (telephone: 630-840-3906, e-mail: GWF@fnal.gov).
V. S. Kashikhin is with the Fermi National Accelerator Laboratory,
Batavia, IL 60510, MS 314, USA (telephone: 630-840-2899, e-mail:
kash@fnal.gov).iron ferromagnetic screen with superconducting NbTi
winding placed into cryostat. The goal of this paper is to
investigate the possibility of design superconducting
transmission line magnet with cold ferromagnetic screen and
compare it with warm iron deign.
II. WARM IRON MAGNET WITH HORIZONTAL APERTURES
SEPARATION
The 2 Tesla transmission line magnet [2] has horizontal
beam separation and warm iron, Fig. 1. The 100 kA
superconducting transmission line made from NbTi
superconductor incorporated into a very compact (80 mm
OD) cryostat. The return bus of transmission line has separate
300 mm diameter cryostat, which also includes all cryolines.
The main advantages of this magnet are: simple construction,
warm iron, open from both sides air gaps, easy magnetic
measurements and beam pipe installation, low cold mass, low
heat load and cost per Tesla-meter. There are also
disadvantages: useless return bus only to reduce fringing
field, weak mechanical connections between half-cores,
strong iron saturation effects, which is difficult to correct.
~F
Fig. 1. 2 Tesla transmission line magnet [1]
III. COLD IRON MAGNET WITH HORIZONTAL APERTURES
SEPARATION
The cold iron option of this magnet can be made without
transmission line cryostat. It reduces apertures separation
distance and as a result the quantity of needed ampere-turns.1
Upcoming Pages
Here’s what’s next.
Search Inside
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Kashikhin, G.William Foster and Vladimir. Superconducting superferric dipole magnet with cold iron core for the VLHC, article, December 28, 2001; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc717152/m1/1/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.