NASA Scientific and Technical Aerospace Reports

20060002422 Fermi National Accelerator Lab., Batavia, IL, USA
HTS Power Leads for the BTEV Interaction Region
Feher, S.; Carcagno, R.; Orris, D.; Page, T.; Pischalnikov, Y.; January 2005; 8 pp.; In English
Report No.(s): DE2005-15017098; FERMILAB-CONF-05-111-TD; No Copyright; Avail.: National Technical Information
Service (NTIS)
A new Interaction Region (IR) for the BTEV experiment was planned to be built at Fermilab. This IR would have required
new superconducting quadrupole magnets and many additional power circuits for their operation. The new ‘low beta’
quadrupole magnet design was based upon the Fermilab LHC quadrupole design, and would have operated at 9.56 kA in 4.5
K liquid helium. The use of conventional power leads for these circuits would have required substantially more helium for
cooling than is available from the cryogenic plant, which is already operating close to its limit. To decrease the heat load and
helium cooling demands, the use of HTS power leads was necessary. In developing specifications for HTS leads for the BTEV
interaction region, several 6 kA HTS leads produced by American Superconductor Corporation (ASC) have been tested at
over-current conditions. Final design requirements were to be based on these test results. This paper summarizes the test results
and describes the design requirements for the 9.65 kA HTS power leads.
NTIS
Particle Accelerators; Liquid Helium; Cryogenics
20060002423 Fermi National Accelerator Lab., Batavia, IL, USA
New Correction Magnet Package for the FERMILAB Booster Synchrotron
Kashikhin, V. S.; Carson, J. A.; Harding, D. J.; Lackey, J. R.; Makarov, A.; January 2005; 8 pp.; In English
Report No.(s): DE2005-15017099; FERMILAB-CONF-05-164-AD-TD; No Copyright; Avail.: National Technical Information
Service (NTIS)
Since its initial operation over 30 years ago, most correction magnets in the Fermilab Booster Synchrotron have only been
able to fully correct the orbit, tunes, coupling, and chromaticity at injection (400MeV). We have designed a new correction
package, including horizontal and vertical dipoles, normal and skew quadrupoles, and normal and skew sextupoles, to provide
control up to the extraction energy (8GeV). In addition to tracking the 15Hz cycle of the main, combined function magnets,
the quadrupoles and sextupoles must swing through their full range in 1 ms during transition crossing. The magnet is made
from 12 water-cooled racetrack coils and an iron core with 12 poles, dramatically reducing the effective magnet air gap and
increasing the corrector efficiency. Magnetic field analyses of different combinations of multipoles are included.
NTIS
Magnets; Synchrotrons
20060002426 Fermi National Accelerator Lab., Batavia, IL, USA
FIONDA (Filtering Images Of Niobium Disks Application) Filter Application for Eddy Current Scanner Data Analysis
Boffo, C.; Bauer, P.; January 2005; 20 pp.; In English
Report No.(s): DE2005-15020167; No Copyright; Avail.: Department of Energy Information Bridge
As part of the material QC process, each Niobium disk from which a superconducting RF cavity is built must undergo
an eddy current scan. This process allows to discover embedded defects in the material that are not visible to the naked eye
because too small or under the surface. Moreover, during the production process of SC cavities the outer layer of Nb is
removed via chemical or electro-chemical etching, thus it is important to evaluate the quality of the subsurface layer (in the
order of 100nm) where superconductivity will happen. The reference eddy current scanning machine is operated at DESY; at
Fermilab we are using the SNS eddy current scanner on loan, courtesy of SNS. In the past year, several upgrades were
implemented aiming at raising the SNS machine performance to that of the DESY reference machine. As part of this effort
an algorithm that enables the filtering of the results of the scans and thus improves the resolution of the process was developed.
The description of the algorithm and of the software used to filter the scan results is presented in this note. This filter
application is a useful tool when the coupling between the signal associated to the long range probe distance (or sample
thickness) variation and that associated to inclusions masks the presence of defects. Moreover instead of using indirect criteria
(such as appearance on screen), the filter targets precisely the topology variations of interest. This application is listed in the
FermiTools database and is freely available.
NTIS
Eddy Currents; Niobium
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