hel.f.a

IRAM, October 2008IRAM, October 2008 11

HEL.F.A.HEL.F.A.Helium du fundamental aux applicationsHelium du fundamental aux applications

People involved at Institut Nèel:People involved at Institut Nèel:Alain BenoitAlain BenoitAurelien Bideaud (PhD)Aurelien Bideaud (PhD)Philippe CamusPhilippe CamusChristian HoffmannChristian HoffmannAlessandro MonfardiniAlessandro MonfardiniLoren Swenson (Post-doc)Loren Swenson (Post-doc)+ 1 PhD Roma-Grenoble (November 2008)+ 1 PhD Roma-Grenoble (November 2008)

LAOG:LAOG: Xavier F. DesertXavier F. Desert


Projects (since Archeops)Projects (since Archeops)

- PLANCK. Space dilution refrigeratorPLANCK. Space dilution refrigerator

- EDELWEISS. Direct Dark Matter search at the Frejus tunnel- EDELWEISS. Direct Dark Matter search at the Frejus tunnel

- NbSi bolometers (high-impedance and TES) arrays development. NbSi bolometers (high-impedance and TES) arrays development. Coordinating the CNES DCMB collaboration (Grenoble-Orsay-Paris)Coordinating the CNES DCMB collaboration (Grenoble-Orsay-Paris)

- mm-wave demonstrator Camera for IRAM (DCMB)mm-wave demonstrator Camera for IRAM (DCMB)

- TERIBOL. Hot-electron NbSi bolometers (led by CSNSM Orsay)- TERIBOL. Hot-electron NbSi bolometers (led by CSNSM Orsay)

- OLIMPO ballon. Roma-Cardiff-Grenoble. 0.5-0.85mm NbSi arraysOLIMPO ballon. Roma-Cardiff-Grenoble. 0.5-0.85mm NbSi arrays

- Kinetic Inductance Detectors. Millimeter-wave detectors, helium detector, Kinetic Inductance Detectors. Millimeter-wave detectors, helium detector, neutrino massneutrino mass

- 1.25-2mm diplexer array development. Dual band concept. Collaboration 1.25-2mm diplexer array development. Dual band concept. Collaboration with CNRS-IMEPwith CNRS-IMEP ( (Institut de Microélectronique Electromagnétisme et Institut de Microélectronique Electromagnétisme et PhotoniquePhotonique) ) and CSIC-UC, Santanderand CSIC-UC, Santander


The DCMB collaborationThe DCMB collaboration

Nèel GrenobleNèel Grenoble Coordination, design, tests, integrations, simulations, part of the microfabrication.

CSNSM Orsay Thermometers NbSi, microfabrication, hot-electron bolometers (TERIBOL)

IEF Orsay Microfabrication (MINERVE)CESR SQUID electronicsIAS Orsay TES testsAPC Paris SQUID multiplexing (SiGe electronics)LPN QPC switchesLPSC Grenoble EM Simulations, MPI opticsLAOG Grenoble Astronomy and simulations


Cryogenics-Optics DevelopmentCryogenics-Optics Development


Bolometric Camera compatible IRAM (helium)Bolometric Camera compatible IRAM (helium)


Bolometric Camera compatible IRAM (PT)Bolometric Camera compatible IRAM (PT)


Martin Puplett Interferometer (MPI)Martin Puplett Interferometer (MPI)

Etendue spectrale: 50 – 3000 GHz expérimentale < 800 GHz étendue de faisceau > 50 GHz

polariseur 10 – 3000 GHzmiroir < 30000 GHz

Résolution: 1,3 GHz1% Amplitude

Reproductible

7 positions de polarisation sur 90°

Durée pour un spectre: de 1 à 10 min


““CameraGrenoble” cryostat cross-sectionCameraGrenoble” cryostat cross-section

Mixing Chamber plateMixing Chamber plate


2.5 arc-min design (existing)2.5 arc-min design (existing)

M6 (flat)M6 (flat)

Cryostat windowCryostat window

M7 (X-YM7 (X-YParabola)Parabola)

Telescope focal planeTelescope focal plane

- 4 K lens- 4 K lens- 100 mK pupil- 100 mK pupil- 100 mK baffle- 100 mK baffle- 100 mK lens100 mK lens- 50-300mK telecentric image50-300mK telecentric image


A bit of ZEMAX (existing stuff)A bit of ZEMAX (existing stuff)

M1 border (r > 14m) imaged on the pupilM1 border (r > 14m) imaged on the pupil


6 arc-min double band configuration6 arc-min double band configuration

M6 (X-Y parabola)M6 (X-Y parabola)

Cryostat window (Cryostat window (=22cm)=22cm)

M7 (X-Y M7 (X-Y parabola)parabola)

2mm array (DCMB 2mm array (DCMB NbSi or MKIDs)NbSi or MKIDs)

1mm array (CEA-PACS)1mm array (CEA-PACS)

Dichroic (100mK)Dichroic (100mK)

Brief specifications:Brief specifications:

4 K HDPE lens:=16 cm=16 cm

100 mK HDPE lenses:100 mK HDPE lenses:=12 cm=12 cm

Beam size at Beam size at Dichroic position:Dichroic position:=11 cm=11 cm

Useful focal plane:Useful focal plane:=64 cm=64 cm

Effective aperture:Effective aperture:f/1.22f/1.22

TELECENTRICTELECENTRIC

Foreseen improvement:Foreseen improvement: 3 simultaneous bands(diplexer 1-2 mm + 850m PACS-like)


BafflingBaffling

2-D2-D (Heron of Alexandria)

3-D3-D (ZEMAX) e.g. 25% of the scattered light hits the cold lens; 6-50% escapes back through the pupil (scattering model is critical).

mmTOTTOT 2 Kg 2 Kg


DETECTORS DEVELOPMENTDETECTORS DEVELOPMENT


The sliced 204 pixels array (version 0)The sliced 204 pixels array (version 0)

Shunt (7nm Pd)Antenna (70nm Al or Nb)Insulating layer (100nm SiN)Thermometer (100nm NbSi)Contacts (40nm Nb)Deep Etching from the back


A closer look at the array (version 0)A closer look at the array (version 0)

Test matrix (August 2007)Test matrix (August 2007)

Goal: understand the complicate EM behaviour and provide a base forthe next design. Seeing light but poor efficiency (tested at 1mm only)

204new001 and 204new002204new001 and 204new002


Electrical measurements: pixels uniformityElectrical measurements: pixels uniformity

Thermal behaviourvirtually identical membranes OK !membranes OK !

Less than 10% absolute dispersion in R at 100mK.

again, thermometers OK !thermometers OK !


Design for Summer 2009 (version 1)Design for Summer 2009 (version 1)

2 m

m

Same fabrication process as v.0Same fabrication process as v.0


Final Design for 2mmFinal Design for 2mm

Drawback of v.1: routing and transmission linesDrawback of v.1: routing and transmission lines

Change to slot antennas

Working on an array of microstrip-coupled bow-tie slots.

Again:Again: not combining the signals in phase. Use separate shunts (or lossy lines) instead. Preserve the single antenna pattern + simpler RF design.

Today working on:Today working on: RF simulations (CST microwave Studio and SONNET), membrane structuration (solved by XeF2 at IEF, Orsay).

First fabrication RUN in 2009.First fabrication RUN in 2009.


Multiplexing High-impedance bolometersMultiplexing High-impedance bolometers

The switches are QPCQPC (Quantum Point Contact) transistors from CNRS-LPN. First full testFirst full test (real bolometers) successfully performed in 2007, now using now using “routinely” the multiplexing“routinely” the multiplexing for optical testing in the DIABOLO cryostat.


MultiplexingMultiplexing


Microwave Kinetic Inductance DetectorsMicrowave Kinetic Inductance Detectors81 pixels LEKIDs array (81 pixels LEKIDs array (in fabricationin fabrication))GOAL: demonstrator at IRAM ??GOAL: demonstrator at IRAM ??Grenoble Camera cryostat fitted with two Grenoble Camera cryostat fitted with two proper HF lines (3-9 GHz LNA, supercond. proper HF lines (3-9 GHz LNA, supercond. coax, attenuators, DC blocks)coax, attenuators, DC blocks)

New activity (2008)New activity (2008)- Designed, fabricated and tested high-Q (105) NbN resonators- Demonstrated a highly sensitive LHedetector for hydrodynamics applications(APPLIED PHYSICS LETTERS APPLIED PHYSICS LETTERS 9393, 134102, 134102)- /4 resonators: slot antennas and grid designs- LEKID design (Roma, IRST, Cardiff)- MUX electronics in progress

NbN


Ongoing: a diplexer arrayOngoing: a diplexer array

STATUS:STATUS: original (positive, step impedance) design ready. original (positive, step impedance) design ready. D.Rauly, A.Monfardini, A.Colin, P.Febvre, PIERS proceedings 852-856, Cambridge, USA, July 2008

From September 2008, working on new From September 2008, working on new Slots + double-stubSlots + double-stub design. design. Purely coplanar geometry or microstrip (TBD). Purely coplanar geometry or microstrip (TBD). Possible coupling:Possible coupling: NbSi bolometers or NbSi bolometers or /2 resonators./2 resonators.

Collaborations: IMEPIMEP (Grenoble), LAHCLAHC (Chambery), CSIC-UCCSIC-UC (Santander) for superconducting transmission lines and planar antennas simulations.

hel.f.a

Documents

mk lens

mk pupil

pixels array version

array of microstrip

mk baffle

hotelectron nbsi bolometers

diplexer array development

final design