Research Activities

The CUORE group at Yale has been involved in the design, construction, and commissioning of the CUORE cryostat, in the analysis and simulation of CUORE and CUORE-0 data, and in research and development for CUPID, the successor to CUORE. Some specific research projects are described below.

CUORE Detector Calibration System

The Detector Calibration System (DCS) is a system of motors, linear actuators, thermalization mechanisms, and other hardware that guides calibration sources into the CUORE cryostat (shown on right) and extracts them after calibration periods have concluded. Our group is responsible for the design, installation, and operation of the DCS in the CUORE cryostat.

As the DCS is integrated into a dilution refrigerator, there are several strict requirements on its construction and operation. One primary consideration is that the source strings and guide tubes must be designed to minimize thermal conductivity between the various stages of the cryostat. In addition, there must not be any straight-line access between the different regions of the cryostat to avoid thermal radiation warming up colder stages. During string motion, frictional heating, which can be particularly pronounced at the coldest stages of the cryostat, must be minimized as well. And during string lowering, the source strings must be cooled as they are lowered in order to avoid dumping large amounts of heat into the colder parts of the cryostat and affecting the detector operation.

CUORE and CUORE-0 calibration analysis and simulation

Our group has helped to develop the analysis framework for the CUORE and CUORE-0 experiments and has performed simulations for determining the optimal calibration source design, activity, and positioning in the CUORE and CUORE-0 cryostat.

CUPID R&D and CUORE muon tracker

The CUORE cryostat does not have dedicated hardware for detecting incoming muons. Although the experiment is located deep underground, the muon flux is not negligible. The CUORE analysis stools can detect many muon events, but a dedicated piece of hardware for detecting muons can significantly improve upon this detection efficiency. A dedicated muon tracker can also validate and help us refine simulations that predict the muon cut efficiency using the existing detectors alone. Moreover, a reduction in the muon background is required to achieve the significant increases in sensitivity required for CUPID, the successor to the CUORE experiment.

Responsibilities and Management

The CUORE group at Yale maintains several active leadership positions inside the CUORE Collaboration. These include:

  • Karsten Heeger: Member of the CUORE Executive Board and member of the Technical Coordinators Board
  • Reina Maruyama: Deputy Chair of the CUORE Council and former member of the Physics Board
  • Ke Han: Member of the CUORE Physics Board, member of the Data Production Working Group, and member of the Thermal Model Working Group
  • Kyungeun Lim: Member of the CUORE Data Vetting Board and coordinator of the Data Production Working Group
  • Jeremy Cushman: Chair of the CUORE Outreach Group and member of the Event Reconstruction Working Group
  • Christopher Davis: Member of the CUORE Outreach Group and member of the Simulations Working Group