Road Map on the Hot-Electron Bolometer

http://fy.chalmers.se/~f4agro/MAR2000/RoadMapHEB.htm
represents a part of
the SCENET Roadmap on Superconducting Bolometers and Detectors
in the scope of V European Framework program http://orchidea.maspec.bo.cnr.it/working_groups/working_group_list.html

Road Map on the Hot-Electron Bolometer
by group of Chalmers University



Purpose:             Submillimetron telescope for the ISS.

 

 Technical requirements for the bolometric detectors arrays:

Wavelengths in submillimeter band: 0.3, 0.4, 0.5, 0.6, 0.8, 1, 1.5 mm
Bandwidth: ~10% of the observing frequency
Detectors:  bolometer arrays
Number of elements in the detector arrays: 10-1000
Cooling: 0.1K
Sensitivity of the detectors in submillimeter band: 10-18 W/Hz-1/2
 

Bolometers:

High-frequency coupling,  thermal isolation:

Antenna-coupled NHEB (Normal Metal Hot-Electron Bolometer) with Andreev Mirrors for high-frequency coupling and  thermal isolation

Antenna-coupled NHEB with Capacitive Coupling and thermal isolation by tunnel junctions

Temperature sensors:

SIN junction

Zero-biased small SIN or NIN junction with resistors

Array of the junctions

Readout : Current-biased SIN junction with voltmeter

Voltage-biased  SIN junction with  dc SQUID picoamperemeter  (1 stage)
      dc SQUID femtoamperemeter (2 stage)
      (see Roadmap on SQUID femtoamperemeter)

Antenna : Double-dipole matching

  Double-dipole matching + on-chip filters

Microwave tests:

Room temperature source (BWO)

Fabri-Perot interferometer + black-body source with T modulation

Josephson spectrometer

 

Milestones:

 

1. DC sensitivity in Current-biased mode to 10-18 W/Hz-1/2

2. Voltage-biased mode with SQUID

3. Optical qualification of sensitivity in He3 cryostat: stimulator

  dipole antenna
  on-chip filters
4. Josephson spectrometer: Josephson oscillator + bolometer

5. ADR for 100 mK. The same optical experiments

 6. Development of the imaging array of bolometers + SQUIDs.
Possibly it will be coordinated with European project (Appendix 1). We are potential participants of the Network.

7. Bolometric detectors arrays. The last system includes several items (array integration, horn concentrators, low-temperature low-noise electronics) connected directly to the bolometers.

 

 Application of the imaging array of bolometers for Submillimeter Telescope of the International Space Station, Project Submillimetron.

We invite all interested collaborators for discussion and participation in this programme.

Appendix 1.
EU Training funding

Cryogenic imaging X-ray and IR/sub-mm sensors

Network:

1     Leicester University, Astro Space Center (Andrew Holland), an X-ray group recently starting work on imaging X-ray detectors based on TES technology

2     University of Jyvaskyla, work on TES sensors for IR and X-ray  (Jukka Pekola)
3      Metorex, Finland
4     VTT, Finland;(Ilkka Suni and Heikki Seppa) experience with high bandwidth SQUIDS in multichannel systems and interest in development of SQUID readout for cryogenic imaging sensors
5     SRON, Utrecht (Piet de Korte)
6     Chalmers University, SQUID readout system for sub-mm bolometers
7     MESA
 

Coordinator Andrew Holland (Leicester University ) has plan to apply in June 2000 for this funding.