An in-situ movable calibration source for cryogenic particle detectors

N. Mast, M. Fritts, D. J. Sincavage, P. Cushman, V. Mandic

Research output: Contribution to journalArticlepeer-review


A prototype device capable of moving a radioactive calibration source to multiple positions was operated at millikelvin temperatures using a modified commercial stepper motor. It was developed as an in-situ calibration strategy for cryogenic dark matter detectors. Data taken by scanning a calibration source across multiple radial positions of a prototype dark matter detector demonstrated its functionality. Construction, heat load, and operation of the device are discussed, as is the effect of the motor on the detector operation. A sample dataset taken over multiple positions of a SuperCDMS detector is presented as an example of the utility of such a device.


  • Calibration
  • Cryogenic
  • Germanium
  • Ionization
  • Phonon
  • Stepper motor

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