To be able to detect gravitation waves in space, physicist have to measure truly minimal displacements: ten billion times smaller than the size of an atom. An improved superconducting sensor is a suitable candidate for this job, Martin Podt of the University of Twente now states in his PhD thesis. He has improved the sensitivity of a so-called ‘SQUID’ in way that it can be combined with a large ball-shaped gravitation detector. Podt succeeds in this by improving the sensitivity. He integrates the sensor with electronics and lowers the operating temperature. He is defending his Phd thesis on January 17, within the Faculty of Science of the University of Twente, The Netherlands.
Gravitation waves, ‘ripples in space’, are very interesting because they provide information about collisions in space. Physicist around the world are working on ways to detect them. Leiden University in The Netherlands currently develops a ball-shaped detector of 65 centimeters in diameter. This grows over a distance of no more than 10 exp –20 meter. To compare it with the size of the earth (and therefore multiplying the size by 20 million), you would like to detect a growth of one fifth of a picometer (one picometer is a millionth of a millionth of a meter).
The superconducting sensor Martin Podt of the University of Twente has designed and developed, gets to the desired sensitivity and can be combined with the MiniGrail system. It is a so-called Superconducting Qantum Interference Devices (SQUID). Podt has improved it by lowering the temperature to a value close to zero Kelvin, and by integrating sensor and electronics. “Our current SQUID did not reach the extreme demands of this application. We would then measure too much noise, and you simply cannot distinguish the noise from the parameter you want to measure,” says Podt. He lowers the temperature to about 20 milliKelvin -the MiniGrail is also cooled down to that temperature. The noise of the ‘conventional’ SQUID is introduced when the signal is amplified using an amplifier operating at room temperature. Podt therefore chooses to put the amplifier on the chip as well, so that both are operating at very low temperatures. The result is that it works substantially faster and introduces no noise.
Wiebe van der Veen | EurekAlert!
First Juno science results supported by University of Leicester's Jupiter 'forecast'
26.05.2017 | University of Leicester
Measured for the first time: Direction of light waves changed by quantum effect
24.05.2017 | Vienna University of Technology
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
26.05.2017 | Life Sciences
26.05.2017 | Life Sciences
26.05.2017 | Physics and Astronomy