A Cryogen-Free Miniature Dilution Refrigerator for Low-Temperature Detector Applications

Teleberg, G.; Chase, S. T.; Piccirillo, L.

doi:10.1007/s10909-008-9724-7

Cited by 16 publications

(13 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More details of the fabrication techniques, resistivities and resistance ratios are given in Glowacka et al 3 The TESs were cooled in a closed-cycle, sorption-pumped dilution refrigerator mounted on a pulse-tube cooler giving a base temperature of 68 mK. 4 The chip, which had 16 individual TESs formed in a 4 × 4 square array, was enclosed in a Au-plated Cu box the inside of which is coated with light-absorbing SiC granules and carbon black mixed in Stycast 2850 to minimize scattered light. A photograph of the experimental enclosure is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Towards Ultra-Low-Noise MoAu Transition Edge Sensors

et al. 2012

View full text Add to dashboard Cite

We report initial measurements on our first MoAu Transition Edge Sensors (TESs). The TESs formed from a bilayer of 40 nm of Mo and 106 nm of Au showed transition temperatures of about 320 mK, higher than identical TESs with a MoCu bilayer which is consistent with a reduced electron transmission coefficient between the bilayer films. We report measurements of thermal conductance in the 200 nm thick silicon nitride SiN x support structures at this temperature, TES dynamic behaviour and current noise measurements.PACS numbers: 85.25Oj,95.55Fw

show abstract

Section: Introductionmentioning

confidence: 99%

Towards Ultra-Low-Noise MoAu Transition Edge Sensors

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Under minimal loading these units have been shown to achieve a minimum temperature of approximately 50 mK. 6 In MUSCAT we anticipate achieving a temperature of order 100 mK. This is limited by the load on our detector stage, which itself is dominated by the optical sky load which we expect to be ∼ 1.6 µW.…”

Section: Cryogenic Designmentioning

confidence: 93%

MUSCAT: the Mexico-UK Sub-Millimetre Camera for AsTronomy

Brien

Ade

Barry

et al. 2018

Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX

View full text Add to dashboard Cite

The Mexico-UK Sub-millimetre Camera for AsTronomy (MUSCAT) is a large-format, millimetre-wave camera consisting of 1,500 background-limited lumped-element kinetic inductance detectors (LEKIDs) scheduled for deployment on the Large Millimeter Telescope (Volcán Sierra Negra, Mexico) in 2018. MUSCAT is designed for observing at 1.1 mm and will utilise the full 4 field of view of the LMTs upgraded 50-m primary mirror. In its primary role, MUSCAT is designed for high-resolution follow-up surveys of both galactic and extra-galactic sub-mm sources identified by Herschel. MUSCAT is also designed to be a technology demonstrator that will provide the first on-sky demonstrations of novel design concepts such as horn-coupled LEKID arrays and closed continuous cycle miniature dilution refrigeration.Here we describe some of the key design elements of the MUSCAT instrument such as the novel use of continuous sorption refrigerators and a miniature dilutor for continuous 100-mK cooling of the focal plane, broadband optical coupling to Aluminium LEKID arrays using waveguide chokes and anti-reflection coating materials as well as with the general mechanical and optical design of MUSCAT. We explain how MUSCAT is designed to be simple to upgrade and the possibilities for changing the focal plane unit that allows MUSCAT to act as a demonstrator for other novel technologies such as multi-chroic polarisation sensitive pixels and on-chip spectrometry in the future. Finally, we will report on the current status of MUSCAT's commissioning.He sorption pump each, this is referred to as a He8 cooler (2 × 4 He). The second stage cooled by a CS cooler uses a system where each precooler consists of a 4 He pump and a 3 He pump, referred to as a He14 cooler (2 × [ 4 He+ 3 He]). The operation of these units including how they are cycled in MUSCAT to accommodate large thermal loads, has been described in a previous paper. 4

show abstract

“…These TESs were cooled in a custom-built cryogen-free system based on a pulse-tube cooler, a 3 He-4 He sorption cooler, and a minidilution unit giving a base temperature of 70 mK. 17 The TESs were cooled and measured in zero applied magnetic field, shielded from stray fields by multiple layers of Metglas and Nb. The read out used a NIST three-stage SQUID multiplexer.…”

Section: Methodsmentioning

confidence: 99%

Thermal models and noise in transition edge sensors

Goldie

Audley

Glowacka

et al. 2009

Journal of Applied Physics

View full text Add to dashboard Cite

Detectors based on transition edge sensors (TESs) must achieve theoretically predicted noise levels if they are to be suitable for the next generation of space-borne astronomical telescopes. The noise of an ideal detector is determined by the sum of three contributions: (i) thermal-fluctuation noise in the heat link to the bath, (ii) Johnson noise in the sensor itself, and (iii) noise in the electrical read-out circuit. Many groups have reported TESs with noise levels significantly above the theoretical predictions. We use two well-defined experimental configurations to measure the read-out noise spectra of Mo–Cu TESs with transition temperatures of 370 and 200mK. The TESs are geometrically simple, comprising superconducting and normal metal films on a silicon nitride (SiNx) membrane. The measurements are compared with a multiparameter noise model, which is based on a physical model of the thin-film devices. Taking into consideration separate, accurate measurements of the heat capacity of identical SiNx membranes, we are able to provide a good account of both the magnitude and frequency dependences of the measured current-noise spectra. We find that an important excess noise mechanism involves the random exchange of heat between the heat capacity of the bilayer and the heat capacity of the nitride membrane, with either the thermal conductance of the membrane, or in some cases the thermal conductance of the bilayer, being the mediating path. Clear design recommendations are given to achieve the best possible noise performance.

show abstract

A Cryogen-Free Miniature Dilution Refrigerator for Low-Temperature Detector Applications

Cited by 16 publications

References 4 publications

Towards Ultra-Low-Noise MoAu Transition Edge Sensors

Towards Ultra-Low-Noise MoAu Transition Edge Sensors

MUSCAT: the Mexico-UK Sub-Millimetre Camera for AsTronomy

Thermal models and noise in transition edge sensors

Contact Info

Product

Resources

About