John March-Russell: Publications

Dark Matter Attenuation Effects: Sensitivity Ceilings for Spin-Dependent and Spin-Independent Interactions

(2025)

Authors:

QUEST-DMC Collaboration, :, N Darvishi, J Smirnov, S Autti, L Bloomfield, A Casey, N Eng, P Franchini, RP Haley, PJ Heikkinen, A Jennings, A Kemp, E Leason, J March-Russell, A Mayer, J Monroe, D Munstermann, MT Noble, JR Prance, X Rojas, T Salmon, J Saunders, R Smith, MD Thompson, A Thomson, A Ting, V Tsepelin, SM West, L Whitehead, DE Zmeev

Evaporating Primordial Black Holes, the String Axiverse, and Hot Dark Radiation

Physical Review Letters American Physical Society (APS) 133:26 (2024) 261003

Authors:

Marco Calzà, John March-Russell, João G Rosa

De Sitter space constraints on brane tensions and couplings

(2024)

Authors:

Saquib Hassan, Georges Obied, John March-Russell

QUEST-DMC: Background Modelling and Resulting Heat Deposit for a Superfluid Helium-3 Bolometer

Journal of Low Temperature Physics Springer 215:5-6 (2024) 465-476

Authors:

S Autti, A Casey, N Eng, N Darvishi, P Franchini, RP Haley, PJ Heikkinen, A Kemp, E Leason, LV Levitin, J Monroe, J March-Russel, MT Noble, JR Prance, X Rojas, T Salmon, J Saunders, R Smith, MD Thompson, V Tsepelin, SM West, L Whitehead, K Zhang, DE Zmeev

Abstract:

We report the results of radioactivity assays and heat leak calculations for a range of common cryogenic materials, considered for use in the QUEST-DMC superfluid 3He dark matter detector. The bolometer, instrumented with nanomechanical resonators, will be sensitive to energy deposits from dark matter interactions. Events from radioactive decays and cosmic rays constitute a significant background and must be precisely modelled, using a combination of material screening and Monte Carlo simulations. However, the results presented here are of wider interest for experiments and quantum devices sensitive to minute heat leaks and spurious events, thus we present heat leak per unit mass or surface area for every material studied. This can inform material choices for other experiments, especially if underground operation is considered – where the radiogenic backgrounds will dominate even at shallow depths.

Centralized design and production of the ultra-high vacuum and laser-stabilization systems for the AION ultra-cold strontium laboratories

AVS Quantum Science American Vacuum Society 6:1 (2024) 14409

Authors:

B Stray, O Ennis, S Hedges, S Dey, M Langlois, K Bongs, S Lellouch, M Holynski, B Bostwick, J Chen, Z Eyler, V Gibson, Tl Harte, Cc Hsu, M Karzazi, J Mitchell, N Mouelle, U Schneider, Y Tang, K Tkalcec, Y Zhi, K Clarke, A Vick, K Bridges, J Coleman, G Elertas, L Hawkins, S Hindley, K Hussain, C Metelko, H Throssell, Cfa Baynham, O Buchmüller, D Evans, R Hobson, L Iannizzotto-Venezze, A Josset, E Pasatembou, Be Sauer, Mr Tarbutt, L Badurina, A Beniwal, D Blas, J Carlton, J Ellis, C McCabe, E Bentine, M Booth, D Bortoletto, C Foot

Abstract:

This paper outlines the centralized design and production of the ultra-high-vacuum sidearm and laser-stabilization systems for the AION Ultra-Cold Strontium Laboratories. Commissioning data on the residual gas and steady-state pressures in the sidearm chambers, on magnetic field quality, on laser stabilization, and on the loading rate for the 3D magneto-optical trap are presented. Streamlining the design and production of the sidearm and laser stabilization systems enabled the AION Collaboration to build and equip in parallel five state-of-the-art Ultra-Cold Strontium Laboratories within 24 months by leveraging key expertise in the collaboration. This approach could serve as a model for the development and construction of other cold atom experiments, such as atomic clock experiments and neutral atom quantum computing systems, by establishing dedicated design and production units at national laboratories.

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