  This article presents an upgraded in-trap decay spectroscopy apparatus which
has been developed and constructed for use with TRIUMF's Ion Trap for Atomic
and Nuclear science (TITAN). This device consists of an open-access
electron-beam ion-trap (EBIT), which is surrounded radially by seven low-energy
planar Si(Li) detectors. The environment of the EBIT allows for the detection
of low-energy photons by providing backing-free storage of the radioactive
ions, while guiding charged decay particles away from the trap centre via the
strong (up to 6 T) magnetic field. In addition to excellent ion confinement and
storage, the EBIT also provides a venue for performing decay spectroscopy on
highly-charged radioactive ions. Recent technical advancements have been able
to provide a significant increase in sensitivity for low-energy photon
detection, towards the goal of measuring weak electron-capture branching ratios
of the intermediate nuclei in the two-neutrino double beta ($2\nu\beta\beta$)
decay process. The design, development, and commissioning of this apparatus are
presented together with the main physics objectives. The future of the device
and experimental technique are discussed.
