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Microwave multiplex read out for superconducting sensors …...Rf-SQUID read out with microvawe...
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Microwave multiplex read out Microwave multiplex read out for superconducting sensors for superconducting sensors ERC – Advanced Grant 2013 GA n. 340321 PI: S. Ragazzi, HI:INFN E. Ferri 1 , D. Becker 2 , D. Bennett 2 , M. Faverzani 1 , J. Fowler 2 , J. Gard 2 , A. Giachero 1 , J. Hays-Wehle 2 , J. Hilton 2 , M. Maino 1 , J. Mates 2 , A. Puiu 1 , A. Nucciotti 1 , D. Schmidt 2 , D. Swetz 2 , J. Ullom 2 , L. Vale 2 1 University of Milano-Bicocca & INFN Milano-Bicocca, Milano, Italy 2 NIST, Boulder, CO, USA Rf-SQUID read out with microvawe multiplexing Rf-SQUID read out with microvawe multiplexing - DC biased TES - SQUID coupled with TES and a resonator circuit - microwave rf-SQUID read out with flux ramp demodulation (common flux line inductively coupled to all SQUIDs O. Noroozian et al., Applied Phys.Lett. 103, (2013) 202602 GHz LC resonator flux ramp bias MHz flux ramp modulation f ramp ROACH2 read out system ROACH2 read out system Bandwidth Budget: Bandwidth Budget: - Effective sampling rate is set by the ramp – f r - Necessary resonator bandwidth per flux ramp: f ≳ 2n Φ 0 f r - To avoid cross talk spacing between resonances f n ≥10 f [potentially reduced by a factor 2] - To avoid distortions f r ≥10/ r [potentially reduced by a factor 2] - Available ADC bandwidth f ADC with ROACH2 system 550 MHz - Mux factor: - Number of flux per ramp n Φ 0 - currently 3, easily scalable to 2, feasible 1.1 n mux = f ADC f n = f ADC τ r 25 ⋅ 2 n Φ 0 τ rise = 5 μs, n Φ 0 = 2 → n n mux mux ≈ ≈ 50 50 Homodyne detection Homodyne detection frequency shift δf ↔ carrier phase shift δϑ Signal reconstructed by homodyne detection and demodulation Homodyne set up developed in Milano-Bicocca capable to readout 2 channels
Transcript of Microwave multiplex read out for superconducting sensors …...Rf-SQUID read out with microvawe...
Microwave multiplex read out Microwave multiplex read out for superconducting sensorsfor superconducting sensors ERC – Advanced Grant 2013
GA n. 340321PI: S. Ragazzi, HI:INFNE. Ferri1, D. Becker2, D. Bennett2, M. Faverzani1, J. Fowler2, J. Gard2, A. Giachero1, J. Hays-Wehle2,
J. Hilton2, M. Maino1, J. Mates2, A. Puiu1, A. Nucciotti1, D. Schmidt2, D. Swetz2, J. Ullom2, L. Vale2
1University of Milano-Bicocca & INFN Milano-Bicocca, Milano, Italy
2NIST, Boulder, CO, USA Rf-SQUID read out with microvawe multiplexingRf-SQUID read out with microvawe multiplexing- DC biased TES- SQUID coupled with TES and a resonator circuit- microwave rf-SQUID read out with flux ramp demodulation (common flux line inductively coupled to all SQUIDs
O. Noroozian et al., Applied Phys.Lett. 103, (2013) 202602
GHz LC resonator
flux ramp
bias
MHz flux ramp modulation framp
ROACH2 read out systemROACH2 read out system
Bandwidth Budget:Bandwidth Budget:
- Effective sampling rate is set by the ramp – fr
- Necessary resonator bandwidth per flux ramp:f ≳ 2nΦ0fr
- To avoid cross talk spacing between resonances fn≥10 f
[potentially reduced by a factor 2]- To avoid distortions f
r≥10/
r
[potentially reduced by a factor 2] - Available ADC bandwidth f
ADC with ROACH2 system 550 MHz
- Mux factor:
- Number of flux per ramp nΦ0
- currently 3, easily scalable to 2, feasible 1.1
nmux=f ADC
f n
=f ADC τr
25⋅2nΦ 0
τrise
= 5 μs, nΦ0= 2 → n nmuxmux≈ ≈ 5050
Homodyne detectionHomodyne detectionfrequency shift δf ↔ carrier phase shift δϑ
Signal reconstructed by homodyne detection and demodulation
Homodyne set up developed
in Milano-Bicocca capable to readout 2
channels
Al wires bonded at the input coil to simulate TES signal
muxTES
IF
Test in progress @ Milano-BicoccaTest in progress @ Milano-Bicocca
- mux 33 channels (2/3 of resonators shorted) + IF board with R
shunt + TES → all provided by NIST.
- Available:● ‘naked’ resonators with input coil directly linked
to external wires for simulating the TES response● resonators + TES with a 55Fe source ● (activity of few Bq)
- Homodyne set up developed in Milano-Bicocca
- G squid = 0.075 (V/0)
- M squid-ramp = 25 pH- M TES-squid = 210 pH- A per flux unit in
0 = 8.87
- framp
= 62.5 kHz
- fADC
= 2.5 MHz
- noise ~ 100 pA/Hz1/2
An example of a 6 keV pulse reconstructed with the mux technique
Load curveLoad curve
Tbath
= 51 mK
