Jahresbericht 2005 - IPHT Jena

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MAGNETIK & QUANTENELEKTRONIK / MAGNETICS & QUANTUM ELECTRONICS
In 2005 the final detailed system design was realized
for the Dynastore project. We finished the
monoliths for the embedding into the bearing and
transferred them to the company Nexans High
Temperature Superconductors for the system integration.
It is scheduled to test the system in 2006.
Public awareness
Under the patronage of the Thuringian minister
of education and cultural affairs Prof. J. Goebel
we organised an interactive exhibition “Eiskalte
Energie für Europa” from June 29 to July 2 in the
GoetheGalerie Jena (Fig. 1.15). The exhibition was
developed in the frame of EU-project “SUPER-
LIFE” in co-operation with the Budapest University
for Technology and Economics (co-ordination),
ICMAB Barcelona, ISMRA Caen, Oxford University,
Ben-Gurion University of the Negev, S-Metall
Budapest and Sydcraft. After contacting schools
within a range of 100 km around Jena we organized
50 guided tours through the exhibition to
bring superconductivity near to the young students.
During the exhibition we counted 2000 persons
testing the human levitator.
Fig. 1.15: Visitors watching a levitated train at the
exhibition.
In addition we showed levitation during the “Highlights
der Physik 2005” in Berlin, at Siemens
Nürnberg, during the “Lange Nacht der Wissenschaften”
in Jena and Erlangen, and at the
Solvay headquarters Hannover. Also we contributed
our human levitator to the TV-science
magazine “Galileo”.
1.2.10 Characterization and application
of bulk MgB 2
(Wolfgang Gawalek, Tobias Habisreuther,
Matthias Zeisberger)
The first motor with MgB 2 elements world-wide
was constructed by ISM Kiev, MAI Moscow and
IPHT Jena (Fig. 1.16).
ISM Kiev produced several MgB 2 plates. In Jena
they were characterized and machined to function
elements. At the MAI Moscow the experimental
Fig. 1.16: Rotor of the first MgB 2 HTS motor.
set-up for motor tests at 21K was constructed and
the motor tests were performed. Test results are
shown in Fig. 1.17. At 20 K this motor showed an
output power of 1300 W at 3000 rpm.
Fig. 1.17: Test results of the MgB 2 motor at 20 K.
The DFG project “Neue Werkstoffe für die
Energietechnik: Magnesiumdiborid” was successfully
enroled.
1.2.11 Preparation of magnetic materials
(Robert Müller)
In the frame of the DFG-priority program spectroscopic
investigations (University Bonn) on glass
crystallised Ba-ferrite BaFe 12–2xTi xCo xO 19 magnetic
particles were continued with respect to the
problem of reduced magnetisation in nanoparticles
(“magnetic dead layer”).
Experiments to prepare magnetite or maghemite
nanoparticles in the 20 nm-range for medical
applications by glass crystallisation as well as by
cyclic wet chemical precipitation were continued.
Essential points of interest are the optimisation of
nucleation and the growth onto given particles
without further nucleation (see Fig. 1.18), respectively.
Mean particles sizes >30 nm could be