Multiplexing Readout of TES Microcalorimeters Based on Analog Baseband Feedback

A TES microcalorimeter array is a promising spectrometer with excellent energy resolution and a moderate imaging capability. To realize a large format array in space, multiplexing the TES signals at the low tempersture stage is mandatory. We are developing frequency division multiplexing (FDM) based...

Full description

Saved in:
Bibliographic Details
Main Authors: Takei, Y, Yamasaki, N Y, Mitsuda, K, Kimura, S, Hirakoso, W, Masui, K, De Korte, P A J, Van Der Kuur, J, Gottardi, L
Format: Conference Proceeding
Language:English
Subjects:
CALORIMETERS
CRYOGENICS
ENERGY RESOLUTION
FEEDBACK
GAIN
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
KHZ RANGE
MAGNETIC FLUX
MHZ RANGE
NOISE
READOUT SYSTEMS
SCINTILLATIONS
SIGNALS
SQUID DEVICES
X-RAY SPECTROMETERS
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A TES microcalorimeter array is a promising spectrometer with excellent energy resolution and a moderate imaging capability. To realize a large format array in space, multiplexing the TES signals at the low tempersture stage is mandatory. We are developing frequency division multiplexing (FDM) based on baseband feedback technique. In FDM, each TES is AC-biased with a different carrier frequency. Signals from several pixels are summed and then read out by one SQUID. The maximum number of multiplexed pixels are limited by the frequency band in which the SQUID can be operated in a flux-locked loop, which is 1 MHz with standard flux-locked loop circuit. In the baseband feedback, the signal (10 kHz band) from the TES is once demodulated. Then a reconstructed copy of the modulated signal with an appropriate phase is fed back to the SQUID input coil to maintain an approximately constant magnetic flux. This can be implemented even for large cable delays and automatically suppresses the carrier. We developed a prototype electronics for the baseband feedback based on an analog phase sensitive detector (PSD) and a multiplier. Combined with Seiko 80-SSA SQUID amp, open-loop gain of 8 has been obtained for 10 kHz baseband signal at 5 MHz carrier frequency, with a moderate noise contribution of 27 pA :Hz at input.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.3292397