The Cryogenic System of DMRadio-50L
Authors:
V. Ankel,
C. Bartram,
J. Begin,
C. Bell,
S. Chaudhuri,
H. -M. Cho,
J. Corbin,
W. Craddock,
S. Cuadra,
A. Droster,
J. Echevers,
E. Engelhardt,
J. T. Fry,
J. Fu,
K. D. Irwin,
A. Keller,
R. Kolevatov,
A. Kunder,
D. Li,
M. Marangola,
N. Otto,
K. M. W. Pappas,
E. Pariset,
S. Puranam,
P. Quassolo
, et al. (14 additional authors not shown)
Abstract:
The DMRadio-50L experiment is designed to search for axion dark matter in the 5 kHz - 5 MHz frequency range using a lumped-element LC resonator and a toroidal magnet and to serve as a testbed for quantum sensors. This paper describes the custom cryogenic system developed to meet the stringent requirements of the experiment within a standard laboratory environment. The system is designed to cool a…
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The DMRadio-50L experiment is designed to search for axion dark matter in the 5 kHz - 5 MHz frequency range using a lumped-element LC resonator and a toroidal magnet and to serve as a testbed for quantum sensors. This paper describes the custom cryogenic system developed to meet the stringent requirements of the experiment within a standard laboratory environment. The system is designed to cool a 200 kg detector assembly to temperatures as low as 50 mK while providing sufficient cooling power at multiple temperature stages. We present the conceptual design, technical implementation, and measured performance of the hybrid cryogenic system, which combines a horizontal dilution refrigerator with a large vertical payload cryostat.
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Submitted 6 July, 2026;
originally announced July 2026.
DMRadio-Core: A new approach for GUT-scale axion searches
Authors:
V. Ankel,
C. Bartram,
J. Begin,
C. Bell,
S. Chaudhuri,
H. -M. Cho,
J. Corbin,
W. Craddock,
S. Cuadra,
A. Droster,
J. Echevers,
E. Engelhardt,
J. T. Fry,
K. D. Irwin,
A. Keller,
R. Kolevatov,
A. Kunder,
N. Kurita,
N. Otto,
E. Pariset,
S. Puranam,
P. Quassolo,
N. M. Rapidis,
C. P. Salemi,
M. Simanovskaia
, et al. (11 additional authors not shown)
Abstract:
Searches for QCD axions with masses in the neV/$c^2$ mass range are strongly motivated by new physics at the GUT scale and by well-motivated pre-inflationary axion symmetry breaking scales. This parameter space is challenging to probe due to the small axion-photon couplings, which typically require large, high-field magnets with substantial stored energy. In this paper, we propose a new experiment…
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Searches for QCD axions with masses in the neV/$c^2$ mass range are strongly motivated by new physics at the GUT scale and by well-motivated pre-inflationary axion symmetry breaking scales. This parameter space is challenging to probe due to the small axion-photon couplings, which typically require large, high-field magnets with substantial stored energy. In this paper, we propose a new experimental geometry based on a narrow-bore, segmented solenoid that optimizes the collection of the axion-induced signal using LC resonators outside the high-field region of the magnet bore. This alternative optimization significantly reduces the required stored magnetic energy while preserving sensitivity, enabling a near-term experiment in the 30-200 MHz (120-830 neV/$c^2$) range, with a cost-effective, staged scaling to a GUT-scale experiment in the 100 kHz-30 MHz (0.4-120 neV/$c^2$) range.
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Submitted 9 July, 2026; v1 submitted 17 April, 2026;
originally announced April 2026.