AC calorimeter bridge; a new multi-pixel readout method for TES calorimeter arrays

In order to realize a large format (e.g. ∼32×32) calorimeter array, it is essential to multiplex calorimeter signals at cryogenic temperatures without losing signal to noise ratio. For this purpose we propose a brand-new readout method, the CABBAGE (Cal¯orimeter B_ridge B_iased by an A_C Ge¯nerator) where an AC biased calorimeters are placed in resistance bridges. In this paper we first describe the principles of CABBAGE and investigate its response and noise. We propose the large format calorimeter array readout using CABBAGEs, and discuss the new TES microcalorimeter readout method without using SQUIDs.