Passive pyrolytic graphite heat switch for sub-Kelvin coolers

Roman Kolevatov; Joe Wiedemann; Dmitrii Trunin; Joelle Marie Begin; Nate Otto; Lyman Page; Saptarshi Chaudhuri

doi:10.1016/j.cryogenics.2025.104079

Passive pyrolytic graphite heat switch for sub-Kelvin coolers

Roman Kolevatov, Joe Wiedemann, Dmitrii Trunin, Joelle Marie Begin, Nate Otto, Lyman Page, Saptarshi Chaudhuri

Research output: Contribution to journal › Article › peer-review

Abstract

We describe a passive heat switch based on a commercial pyrolytic graphite sheet. Measurements of the thermal conductivity of the graphite are presented, confirming a large difference between room temperature and ≈4 K. The implementation of a graphite heat switch in a cryostat operating a ³He/⁴He sorption refrigerator is demonstrated.

Original language	English (US)
Article number	104079
Journal	Cryogenics
Volume	149
DOIs	https://doi.org/10.1016/j.cryogenics.2025.104079
State	Published - Jul 15 2025

All Science Journal Classification (ASJC) codes

General Materials Science
General Physics and Astronomy

Keywords

Passive heat switch
Pyrolytic graphite
Sub-Kelvin refrigeration system

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10.1016/j.cryogenics.2025.104079

Cite this

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abstract = "We describe a passive heat switch based on a commercial pyrolytic graphite sheet. Measurements of the thermal conductivity of the graphite are presented, confirming a large difference between room temperature and ≈4 K. The implementation of a graphite heat switch in a cryostat operating a 3He/4He sorption refrigerator is demonstrated.",

keywords = "Passive heat switch, Pyrolytic graphite, Sub-Kelvin refrigeration system",

author = "Roman Kolevatov and Joe Wiedemann and Dmitrii Trunin and Begin, {Joelle Marie} and Nate Otto and Lyman Page and Saptarshi Chaudhuri",

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AU - Kolevatov, Roman

AU - Wiedemann, Joe

AU - Trunin, Dmitrii

AU - Begin, Joelle Marie

AU - Otto, Nate

AU - Page, Lyman

AU - Chaudhuri, Saptarshi

PY - 2025/7/15

Y1 - 2025/7/15

N2 - We describe a passive heat switch based on a commercial pyrolytic graphite sheet. Measurements of the thermal conductivity of the graphite are presented, confirming a large difference between room temperature and ≈4 K. The implementation of a graphite heat switch in a cryostat operating a 3He/4He sorption refrigerator is demonstrated.

AB - We describe a passive heat switch based on a commercial pyrolytic graphite sheet. Measurements of the thermal conductivity of the graphite are presented, confirming a large difference between room temperature and ≈4 K. The implementation of a graphite heat switch in a cryostat operating a 3He/4He sorption refrigerator is demonstrated.

KW - Passive heat switch

KW - Pyrolytic graphite

KW - Sub-Kelvin refrigeration system

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VL - 149

JO - Cryogenics

JF - Cryogenics

M1 - 104079

ER -

Passive pyrolytic graphite heat switch for sub-Kelvin coolers

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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