Please read these instructions before posting any event on Fermilab Indico

** Please note the updated maintenance time **

Indico will be down for maintenance starting at 7:00PM CST on Dec 14th 2023. Most Indico features will be available starting at 8:30CST. Registration for events involving Site Access and Badging will not be available until 11:30PM CST.

Mar 18 – 22, 2021
Stony Brook, NY
US/Eastern timezone

HeRALD - light dark matter search with superfluid Helium-4

Mar 19, 2021, 2:25 PM
Stony Brook, NY

Stony Brook, NY

Online [US/EST Timezone]
Noble Elements Noble Elements


Junsong Lin (UC Berkeley)


HeRALD - Helium Roton Apparatus for Light Dark Matter uses bolometers with TES readout to detect signals in superfluid Helium-4 from light dark matter. The low energy threshold enabled by cryogenic bolometers, with signal amplified by quantum evaporation of helium atoms from phonons/rotons in superfluid Helium-4 and the low atomic mass of Helium-4 with better kinematic matching for light dark matter, make HeRALD promising to search for light dark matter. I will present preliminary results of light yield measurements of superfluid Helium-4 from electronic recoils from 36 keVee to 185 keVee and nuclear recoils from 53 keVnr to 1 MeVnr. I will also present some recent development on helium testing cells in Helium-3/Helium-4 dilution refrigerators, constructed to demonstrate several key technologies, including helium film burners, Cs film stoppers, and knife-edge film thinners.

Primary authors

Junsong Lin (UC Berkeley) Daniel McKinsey (University of California, Berkeley) Mr Andreas Biekert (University of California, Berkeley) Vetri Velan (University of California, Berkeley) Maurice Garcia-Sciveres (LBNL) Peter Sorensen (LBL) Harold Pinckney (University of Massachusetts Amherst) Mr Roger Romani (University of California, Berkeley) Mr Ryan Smith (University of California, Berkeley) Mr Pratyush Patel (University of Massachusetts Amherst) Dr Suerfu (University of California, Berkeley) Mr Luke Chaplinsky (University of Massachusetts Amherst) Scott Hertel (UMass Amherst)

Presentation materials