TY  - JOUR
A1  - Werner, Frederik
A1  - Wagner, Torsten
A1  - Yoshinobu, Tatsuo
A1  - Keusgen, Michael
A1  - Schöning, Michael Josef
T1  - Frequency behaviour of light-addressable potentiometric sensors
JF  - Physica Status Solidi (A)
N2  - Light-addressable potentiometric sensors (LAPS) are semiconductor-based potentiometric sensors, with the advantage to detect the concentration of a chemical species in a liquid solution above the sensor surface in a spatially resolved manner. The addressing is achieved by a modulated and focused light source illuminating the semiconductor and generating a concentration-depending photocurrent. This work introduces a LAPS set-up that is able to monitor the electrical impedance in addition to the photocurrent. The impedance spectra of a LAPS structure, with and without illumination, as well as the frequency behaviour of the LAPS measurement are investigated. The measurements are supported by electrical equivalent circuits to explain the impedance and the LAPS-frequency behaviour. The work investigates the influence of different parameters on the frequency behaviour of the LAPS. Furthermore, the phase shift of the photocurrent, the influence of the surface potential as well as the changes of the sensor impedance will be discussed.
Y1  - 2013
U6  - https://doi.org/10.1002/pssa.201200929
SN  - 1521-396X ; 0031-8965
VL  - 210
IS  - 5
SP  - 884
EP  - 891
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Barsov, S.
A1  - Bechstedt, U.
A1  - Hardt, Arno
T1  - ANKE, a new facility for medium energy hadron physics at COSY-Jülich / S. Barsov [u.a.]
JF  - Nuclear instruments and methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. Vol. 462, iss. 3
Y1  - 2001
SN  - 0167-5087 (Print) ; 0168-9002 (E-journal)
SP  - 364
EP  - 381
ER  - 
TY  - JOUR
A1  - Balewski, J.
A1  - Brauksiepe, S.
A1  - Hardt, Arno
T1  - Threshold measurements at the internal experimental facility COSY-11 / J. Balewski [u.a.]
JF  - Nuclear physics A. Vol. 626, iss. 1-2
Y1  - 1997
SN  - 1873-1554 (E-Journal) ; 0375-9474 (Print)
SP  - 85
EP  - 92
ER  - 
TY  - JOUR
A1  - Schult, O. W. B.
A1  - Sistemich, K.
A1  - Hardt, Arno
T1  - Plans for investigations of subthreshold K+ production in p+A collisions / O. W. B. Schult [u.a.]
JF  - Nuclear Physics A. Vol. 583
Y1  - 1995
SN  - 1873-1554 (E-journal); 0375-9474 (Print)
SP  - 629
EP  - 632
ER  - 
TY  - JOUR
A1  - Makovicka, C.
A1  - Gärtner, G.
A1  - Hardt, Arno
A1  - Hermann, W.
A1  - Wiechert, D. U.
T1  - Impregnated cathode surface investigations by SFM/STM and SEM/EDX
JF  - Applied surface science. Vol. 111
Y1  - 1997
SN  - 1873-5584 (E-Journal); 0169-4332 (Print)
SP  - 70
EP  - 75
ER  - 
TY  - JOUR
A1  - Bechstedt, U.
A1  - Haas, H.
A1  - Hacker, U.
A1  - Hardt, Arno
A1  - Henn, K.
A1  - Martin, S.
A1  - Wimmer, J.
T1  - Magnets for the German Spallation Source SNQ
JF  - IEEE transactions on nuclear science. Vol. 32, iss. 5
Y1  - 1985
SN  - 1558-1578 (E-Journal); 0018-9499 (Print)
SP  - 3631
EP  - 3633
ER  - 
TY  - JOUR
A1  - Martin, S. A.
A1  - Berg, G. P. A.
A1  - Hacker, U.
A1  - Hardt, Arno
A1  - Köhler, M.
A1  - Meißburger, J.
A1  - Osterfeld, F.
A1  - Prasuhn, D.
A1  - Riepe, G.
A1  - Rogge, M.
A1  - Schult, O. W. B.
A1  - Speth, J.
A1  - Turek, P.
A1  - Gaul, G.
A1  - Hagedoorn, H.
A1  - Heide, J. A. van der
A1  - Hinterberger, F.
A1  - Huber, M.
A1  - Jahn, R.
A1  - Mayer-Kuckuk, T.
A1  - Poth, H.
A1  - Paetz gen. Schieck, H.
T1  - COSY - a cooler synchrotron and storage ring
JF  - IEEE transactions on nuclear science. Vol. 32, iss. 5
Y1  - 1985
SN  - 1558-1578 (E-Journal); 0018-9499 (Print)
SP  - 2694
EP  - 2696
ER  - 
TY  - JOUR
A1  - Martin, Siegfried A.
A1  - Hardt, Arno
A1  - Meissburger, Jürgen
A1  - Berg, Georg P. A.
A1  - Hacker, Ulrich
A1  - Hürlimann, Werner
A1  - Römer, Josef G. M.
A1  - Sagefka, Thomas
A1  - Retz, Adolf
A1  - Schult, Otto W. B.
T1  - The QQDDQ magnet spectrometer “BIG KARL”
JF  - Nuclear instruments and methods in physics research. Vol. 214, iss. 2-3
Y1  - 1983
SN  - 0029-554x (E-Journal); 1872-9606 (E-Journal); 0167-5087 (Print)
SP  - 281
EP  - 303
ER  - 
TY  - JOUR
A1  - Berg, G. P. A.
A1  - Demarteau, M.
A1  - Hardt, Arno
A1  - Hürlimann, W.
A1  - Martin, S. A.
A1  - Meissburger, J.
A1  - Oelert, W.
A1  - Seyfart, H.
A1  - Styczen, B.
A1  - Köhler, M.
A1  - Oelrich, I.
A1  - Scheerer, J.
T1  - High resolution spectroscopy of 102Ru(d, p)103Ru and 104Ru(p, d)103Ru reactions
JF  - Nuclear Physics A. Vol. 379, iss. 1
Y1  - 1982
SN  - 1873-1554 (E-Journal); 0375-9474 (Print)
SP  - 93
EP  - 109
ER  - 
TY  - JOUR
A1  - Hardt, Arno
A1  - Martin, S.
A1  - Meißburger, J.
A1  - Retz, R.
A1  - Wimmer, J.
T1  - The cryopump system of the QQDDQ magnet spectrometer BIG KARL
JF  - Vacuum
N2  - Cryopumps without liquid nitrogen shielding are used to provide a vacuum of 10−6 torr in the spectrometer. The vacuum system is subdivided in three sections that can be separated by valves.

The first section (scattering chamber) has a volume of 60 l, two rotation transmissions with 35 cm dia and a sliding seal that allows a rotation of 160° without deteriorating the vacuum. The second section includes the vacuum chambers inside the magnets with 6 × 80 cm cross-section and a length of 1200 cm. The third section (detector box) has a volume of 4300 l and contains a moveable detector system. The gas inside the detector with a pressure of 760 torr is separated from the vacuum by a 15 μm mylar foil with an area of 300 cm2. The detector box can be valved off by a valve with the dimension of 10 × 100 cm.

The layout of system is given. The instrumentation and the interlock system are described. First experiences with this system are presented.
Y1  - 1978
U6  - https://doi.org/10.1016/S0042-207X(78)80026-8
SN  - 1879-2715 (E-Journal); 0042-207X (Print)
VL  - 28
IS  - 10-11
SP  - 483
PB  - Elsevier
CY  - Amsterdam
ER  -