[Paper Review] IceCube-Gen2: A Vision for the Future of Neutrino Astronomy in Antarctica

Gen Collaboration, M. G. Aartsen+326 more|arXiv (Cornell University)|Dec 16, 2014

Astrophysics and Cosmic Phenomena1 references144 citations

TL;DR

IceCube-Gen2 proposes a next-generation neutrino observatory in Antarctica with a target instrumented volume of 10 km³, enabling high-sensitivity detection of astrophysical neutrinos. The project features a modular, sled-mounted high-pressure hot water drilling system that reuses IceCube components, improving efficiency, reducing labor, and enhancing optical quality in refrozen ice, thereby advancing neutrino astronomy and multi-messenger physics.

ABSTRACT

The recent observation by the IceCube neutrino observatory of an astrophysical flux of neutrinos represents the "first light" in the nascent field of neutrino astronomy. The observed diffuse neutrino flux seems to suggest a much larger level of hadronic activity in the non-thermal universe than previously thought and suggests a rich discovery potential for a larger neutrino observatory. This document presents a vision for an substantial expansion of the current IceCube detector, IceCube-Gen2, including the aim of instrumenting a $10\,\mathrm{km}^3$ volume of clear glacial ice at the South Pole to deliver substantial increases in the astrophysical neutrino sample for all flavors. A detector of this size would have a rich physics program with the goal to resolve the sources of these astrophysical neutrinos, discover GZK neutrinos, and be a leading observatory in future multi-messenger astronomy programs.

Motivation & Objective

• To significantly expand the instrumented volume of neutrino detection in Antarctica to enable high-sensitivity studies of astrophysical neutrinos.
• To address operational inefficiencies of the current IceCube hot water drilling system by developing a modular, mobile, and efficient high-pressure hot water drilling (EHWD) system.
• To reduce the labor and maintenance burden of deep-ice drilling through reuse of existing IceCube EHWD components and optimized system design.
• To improve optical clarity in refrozen ice by filtering and degassing drilling water, enhancing detector performance.
• To enable detailed spectral and directional studies of high-energy neutrinos and support multi-messenger astronomy with next-generation observatories.

Proposed method

• Design a modular, sled-mounted high-pressure hot water drilling system using multiple parallel units with microturbine generators, heat exchangers, water heaters, and high-pressure pumps.
• Reuse key components from the existing IceCube EHWD system, including cable and hose reel systems, drilling and deployment towers, and support infrastructure.
• Implement water filtration and degassing systems to improve optical transparency in refrozen ice, minimizing light absorption and scattering.
• Optimize the geometrical sensor arrangement in the high-energy array to maximize sensitivity to astrophysical neutrinos across all flavors.
• Integrate the new drilling system with a large-scale detector design targeting an instrumented volume of approximately 10 km³.
• Leverage proven IceCube technologies and operational experience to ensure reliability and scalability of the full IceCube-Gen2 facility.

Experimental results

Research questions

• RQ1 How can the efficiency and operational footprint of deep-ice drilling be reduced while maintaining high drilling performance for a km³-scale neutrino telescope?
• RQ2 What modular, mobile, and energy-efficient drilling system design enables reliable deployment of detector strings in Antarctic ice over a single season?
• RQ3 To what extent can reuse of existing IceCube EHWD components reduce costs and complexity in the construction of IceCube-Gen2?
• RQ4 How does filtering and degassing of drilling water improve optical properties in refrozen ice, and what impact does this have on neutrino detection efficiency?
• RQ5 What is the optimal sensor geometry for maximizing sensitivity to high-energy astrophysical neutrinos in a 10 km³ instrumented volume?

Key findings

• The proposed IceCube-Gen2 high-energy array will achieve an instrumented volume approaching 10 km³, enabling a substantial increase in neutrino detection rates.
• The modular, sled-mounted EHWD system reduces the need for large, permanent infrastructure and allows deployment across multiple string groups in a single season.
• By reusing existing IceCube EHWD components, the new system reduces both capital and operational costs while minimizing maintenance requirements.
• Water filtration and degassing significantly improve optical clarity in refrozen ice, reducing background noise and enhancing signal reconstruction.
• The design enables high-precision neutrino reconstruction and background rejection, making detailed spectral and directional studies of astrophysical neutrinos feasible.
• The project is on a clear path to full implementation, with a complete preliminary design integrating proven technologies and optimized geometry for maximum sensitivity.