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--- cupid_pub:the_cupid_experiment [2021/05/22 14:19]
benato [The Experiment]
+++ cupid_pub:the_cupid_experiment [2021/06/01 08:23]
dilorenzo1 [The Experiment]
@@ Line 44: / Line 44: @@
 |{{ cupid_pub:double_beta.png?330 }} |{{ cupid_pub:screenshot_20210522_144702.jpeg?330 }}|
-|Decay scheme of 2νββ (top) and 0νββ decay (bottom). The two processes share the same parent and daughter nucleus, but differ for the number of emitted partiles, and consequently their energy.|The measurable sum electron spectrum is a continuum for 2νββ decay, and an excess at Q<sub>ββ</sub> for 0νββ decay.|
+|Decay scheme of 2νββ (top) and 0νββ decay (bottom). The two processes share the same parent and daughter nucleus, but differ for the number of emitted particles, and consequently their energy.|The measurable sum electron spectrum is a continuum for 2νββ decay, and an excess at Q<sub>ββ</sub> for 0νββ decay.|
@@ Line 65: / Line 65: @@
 Thus, CUPID will not only change the crystal, but also the candidate isotope. The reason for this choice is twofold:
 on the one hand, Li<sub>2 </sub>MoO<sub>4</sub> is a scintillating material with a particle-dependent light yield,
-on the other hand the candidate isotpe <sup>100</sup>Mo has a Q-value of 3034 keV
+on the other hand the candidate isotope <sup>100</sup>Mo has a Q-value of 3034 keV
-(compared to 2527 keV of <sup>130</sup>Te), which lies above most of the γ background from environmental radioactivity.
+(compared to 2527 keV of <sup>130</sup>Te), which lies above most of the γ background from environmental radioactivity. Special attention is paid to the minimization of the radioactive contamination levels of all employed materials. Using the information from the predecessor experiments CUORE, [[https://cupid-0.lngs.infn.it/|CUPID-0]], and [[https://cupid-mo.mit.edu|CUPID-Mo]], the projected background at Q<sub>ββ</sub> is expected to be at the level of 10<sup>-4</sup> counts/keV/kg/yr.
@@ Line 75: / Line 75: @@
-==== The Detector ====
+===== The Detector =====
-The CUPID crystals are operated as cryogenic calorimeters, each equipped with a cryogenic light detector. A particle interaction in the crystal produces a phonon  and light signal (see figure below), the latter one is used to discriminate  α background from the electrons events.
-{{ :cupid_pub:cupid_detector.png?450 |}}
+In CUPID, the Li<sub>2</sub>MoO<sub>4</sub> crystals are operated as cryogenic calorimeters, and coupled to a light detector. The light detectors are germanium wafers, and are also instrumented as calorimeters.
+A particle interaction in the crystal produces phonons and scintillation light.
+The heat from recombining phonons is read by a Neutron Transmutation Doped (NTD) germanium thermistor
+glued to the crystal. The light escapes the crystal, inducing a phonon signal in the light detector, which is also read by an NTD.
+|{{ cupid_pub:cupid_detector.png?350 }}|{{cupid_pub:screenshot_20210522_221509.jpeg?450}}|
+|Schematic of a cryogenic calorimeter, with the heat channel (blue) and a light detector (gray).|Installation of crystals for a CUPID test run. A light detector is visible in the bottom right.|

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