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26 April 2024 |
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Reducing DRIFT Backgrounds with a Submicron Aluminized-Mylar Cathode | | James B.R. Battat
; Ed Daw
; Alexei Dorofeev
; Anthony C. Ezeribe
; Jennifer R. Fox
; Jean-Luc Gauvreau
; Michael Gold
; Lydia Harmon
; John Harton
; Randy Lafler
; Robert J. Lauer
; Eric R. Lee
; Dinesh Loomba
; Alexander Lumnah
; John Matthews
; Eric H. Miller
; Frederic Mouton
; Alexander St.J. Murphy
; Nguyen Phan
; Stephen W. Sadler
; Andrew Scarff
; Fred Schuckman II
; Daniel Snowden-Ifft
; Neil J.C. Spooner
; Daniel Walker
; | | Date: |
12 Feb 2015 | | Abstract: | Background events in the DRIFT-IId dark matter detector, mimicking potential
WIMP signals, are predominantly caused by alpha decays on the central cathode
in which the alpha particle is completely or partially absorbed by the cathode
material. We installed a 0.9 micron thick aluminized-mylar cathode as a way to
reduce the probability of producing these backgrounds. We study three
generations of cathode (wire, thin-film, and radiologically clean thin-film)
with a focus on the ratio of background events to alpha decays. Two independent
methods of measuring the absolute alpha decay rate are used to ensure an
accurate result, and agree to within $10\%$. Using alpha range spectroscopy, we
measure the radiologically cleanest cathode version to have a contamination of
$3.3pm0.1$ ppt $^{234}$U and $73pm2$ ppb $^{238}$U. This cathode reduces the
probability of producing an RPR from an alpha decay by a factor of $70pm20$ %
while reducing the overall background rate by $96.5pm0.5\%$ compared to the
original stainless steel wire cathode. First results are presented from a
texturized version of the cathode, intended to be even more transparent to
alpha particles. These efforts, along with other background reduction measures,
have resulted in a drop in the observed background rate from 500/day to 1/day.
With the recent implementation of full-volume fiducialization, these remaining
background events are identified, allowing for background-free operation. | | Source: | arXiv, 1502.3535 | | Services: | Forum | Review | PDF | Favorites | |
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