6.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Aalto UniversityFI160 papers
- University of HelsinkiFI89 papers
- Centre National de la Recherche ScientifiqueFR69 papers
- National Institute for AstrophysicsIT65 papers
- Helsinki Institute of PhysicsFI63 papers
- University of ManchesterGB63 papers
- University of MilanIT63 papers
- University of California, Santa BarbaraUS61 papers
- University of TriesteIT58 papers
- Universidad de CantabriaES57 papers
- University of OsloNO57 papers
- University of Rome Tor VergataIT57 papers
20 papers · 1 filter
Quasioptic, Calibrated, Full 2-port Measurements of Cryogenic Devices under Vacuum in the 220-330 GHz Band
Maxim Masyukov, Aleksi Tamminen, Irina Nefedova +8
A quasi-optical (QO) test bench was designed, simulated, and calibrated for characterizing S-parameters of devices in the 220-330 GHz (WR-3.4) frequency range, from room temperatur…
Demonstration of MHz frequency domain multiplexing readout of 37 transition edge sensors for high-resolution x-ray imaging spectrometers
H. Akamatsu, D. Vaccaro, L. Gottardi +22
We report on the development and demonstration of a MHz frequency domain multiplexing (FDM) technology to read out arrays of cryogenic transition edge sensor (TES) X-ray microcalor…
LED based photoacoustic NO sensor with sub-ppb detection limit
Juho Karhu, Tuomas Hieta, Farshid Manoocheri +2
A high-sensitivity LED based photoacoustic NO sensor is demonstrated. Sensitive photoacoustic gas sensors based on incoherent light sources are typically limited by background…
Two-stage SQUID amplifier with bias current re-use
Mikko Kiviranta
We have designed and fabricated an integrated two-stage SQUID amplifier, requiring only one bias line and one flux setpoint line. From the biasing viewpoint the two stages are conn…
Magnetic field sensing with the kinetic inductance of a high- superconductor
V. Vesterinen, S. Ruffieux, A. Kalabukhov +5
We carry out an experimental feasibility study of a magnetic field sensor based on the kinetic inductance of the high- superconductor yttrium barium copper oxide. We…
Nanobolometer with Ultralow Noise Equivalent Power
R. Kokkoniemi, J. Govenius, V. Vesterinen +10
Since the introduction of bolometers more than a century ago, they have been applied in a broad spectrum of contexts ranging from security and the construction industry to particle…
Microfabricated sensor platform with through-glass vias for bidirectional 3-omega thermal characterization of solid and liquid samples
Corinna Grosse, Mohamad Abo Ras, Aapo Varpula +6
A novel microfabricated, all-electrical measurement platform is presented for a direct, accurate and rapid determination of the thermal conductivity and diffusivity of liquid and s…
Traceable Coulomb Blockade Thermometry
Ossi Hahtela, Emma Mykkanen, Antti Kemppinen +6
We present a measurement and analysis scheme for determining traceable thermodynamic temperature at cryogenic temperatures using Coulomb blockade thermometry. The uncertainty of th…
Reducing current noise in cryogenic experiments by vacuum-insulated cables
E. Mykkänen, J. S. Lehtinen, A. Kemppinen +4
We measure the current noise of several cryogenic cables in a pulse tube based dilution refrigerator at frequencies between about 1~mHz and 50~kHz. We show that vibration-induced n…
Characterization of Thin p-on-p Radiation Detectors with Active Edges
T. Peltola, X. Wu, J. Kalliopuska +5
Active edge p-on-p silicon pixel detectors with thickness of 100 m were fabricated on 150 mm Float zone silicon wafers at VTT. By combining measured results and TCAD simulations…
Processing and characterization of epitaxial GaAs radiation detectors
X. Wu, T. Peltola, T. Arsenovich +12
GaAs devices have relatively high atomic numbers (Z=31, 33) and thus extend the X-ray absorption edge beyond that of Si (Z=14) devices. In this study, radiation detectors were proc…
Multiplexed readout demonstration of a TES-based detector array in a resistance locked loop
Jan van der Kuur, Luciano Gottardi, Mikko Kiviranta +5
TES-based bolometer and microcalorimeter arrays with thousands of pixels are under development for several space-based and ground-based applications. A linear detector response and…
A Strained Silicon Cold Electron Bolometer using Schottky Contacts
T. L. R. Brien, P. A. R. Ade, P. S. Barry +10
We describe optical characterisation of a Strained Silicon Cold Electron Bolometer (CEB), operating on a stage, designed for absorption of millimetre-wave radiati…
Gas Analyses of First complete JET Cryopump Regeneration with ITER-Like Wall
S. Grunhagen Romanelli, S. Brezinsek, B. Butler +12
Analytical results of a complete JET cryopump regeneration, including the nitrogen panel, following the first ITER-Like Wall campaign are presented along with the in-situ analyses…
Surface analysis of tiles and samples exposed to the first JET campaigns with the ITER-Like Wall
J P Coad, E Alves, N P Barradas +8
This paper reports on the first post-mortem analyses of tiles removed from JET after the first campaigns with the ITER-like Wall (ILW) during 2011-2 [1]. Tiles from the divertor ha…
Kinetic Inductance Magnetometer
Juho Luomahaara, Visa Vesterinen, Leif Grönberg +1
Ultrasensitive magnetic field detection is utilized in the fields of science, medicine and industry. We report on a novel magnetometer relying on the kinetic inductance of supercon…
Comparison of JET main chamber erosion with dust collected in the divertor
A. Widdowson, C. F. Ayres, S. Booth +9
A complete global balance for carbon in JET requires knowledge of the net erosion in the main chamber, net deposition in the divertor and the amount of dust and flakes collecting i…
Operation of transition edge sensors in a resistance locked loop
Jan van der Kuur, Mikko Kiviranta
We propose to operate a superconducting transition edge sensor (TES) using a different type of biasing, in which the resistance of the TES is kept constant by means of feedback on…
Test Beam Results of 3D Silicon Pixel Sensors for the ATLAS upgrade
ATLAS 3D Collaboration, P. Grenier, G. Alimonti +90
Results on beam tests of 3D silicon pixel sensors aimed at the ATLAS Insertable-B-Layer and High Luminosity LHC (HL-LHC)) upgrades are presented. Measurements include charge collec…
Superconducting Nb-film LC resonator
A. Finne, L. Groenberg, R. Blaauwgeers +6
Sputtered Nb thin-film LC resonators for low frequencies at 0.5 MHz have been fabricated and tested in the temperature range 0.05--1 K in magnetic fields up to 30 mT. Their Q value…