G. M. Stiehl, W. B. Doriese, J. W. Fowler, G. C. Hilton, K. D. Irwin, C. D. Reintsema, D. R. Schmidt, D. S. Swetz, J. N. Ullom, L. R. Vale.
We demonstrate the code-division multiplexed (CDM) readout of eight
transition-edge sensor microcalorimeters. The energy resolution is 3.0 eV (full
width at half-maximum) or better at 5.9 keV, with a best resolution of 2.3 eV
and a mean of 2.6 eV over the seven modulated detectors. The flux-summing CDM
system is described and compared with similar time-division multiplexed (TDM)
readout. We show that the sqrt(Npixels) multiplexing disadvantage associated
with TDM is not present in CDM. This demonstration establishes CDM as both a
simple route to higher performance in existing TDM microcalorimetric
experiments and a long-term approach to reaching higher multiplexing factors.
View original:
http://arxiv.org/abs/1201.6289
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