AMoRE L.T. Measurement. Geon-Bo Kim SNU & KRISS
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1 AMoRE L.T. Measurement Geon-Bo Kim SNU & KRISS 1
2 Outline Goals of detector development Development history Recent measurement Summary and Future plans 2
3 Outline Goals of detector development Development history Recent measurement Summary and Future plans 3
4 Experimental Sensitivity of 0nbb Search Detector mass Time Detection efficiency Background level Energy resolution Zero background condition Goals of detector development High energy resolution Determined by detector performance Pulse shape discrimination for surface alpha events rejection Reducing random coincidence background events by decreasing pulse rise-time. 4
5 Outline Goals of detector development Development history Recent measurement Summary and Future plans 5
6 Preliminary Experiment (by Sang-Jun Lee) 6
7 The First Design of the Large CMO Detector (by Sang-Jun Lee) 53 kev FWHM for 2615 kev gamma peak. 2ms pulse rise-time. Position dependent signal shapes. Worsening of energy resolution. 7
8 The First Design of the Large CMO Detector (by Sang-Jun Lee) 53 kev FWHM for 2615 kev gamma peak. 2ms pulse rise-time. Position dependent signal shapes. Worsening of energy resolution. 8
9 Thermal Model Thermal model was established to understand heat flows and optimize detector design. Athermal phonon collection is a key point. 9
10 The Second Design Red: first design Blue: second design A large gold film (2cm diameter x 200 nm thickness) was evaporated. Big and slow pulse shape was obtained due to low lateral conductance of the gold film. 10
11 The Second Design Sum (pulse-area) parameter was used to reduce positiondependence effect. 11
12 The Third Design (2013) Additional gold pattern VM2000 reflector 12 MMC chip made by KIP group Copper Holder 216 g CaMoO 4 crystal Thin gold film Three-times faster and bigger pulse shape was obtained compare with the first experiment.
13 Pulse shape discrimination α and β events show different pulse shapes. They can be separated by pulse shape indicatoras. 13
14 Energy spectrum-gamma Energy (kev) Baseline FWHM (kev) Background spectrum for 194 hours measurement at the aboveground laboratory (KRISS). With cup lead shield of 10 cm thickness. (solid angle of ~ 5% is opened) 14
15 Energy spectrum-alpha Internal alpha background events from non-enriched crystal. Template fitting method was applied with surface alpha (external source) template. Higher energy peaks have worse energy resolution. Possibly due to different pulse shapes of bulk events for the template pulse. 15
16 Energy calibration α and β events show different energy scale 2.6 MeV). The detector shows good linearity for both of alpha and gamma signals. 16
17 Outline Goals of detector development Development history Recent measurement Summary and Future plans 17
18 Recent Set-up (4th Design) A MMC chip fabricated at KRISS. Will be presented by W.S. Yoon Photon detector There were minor changes for the phonon detector design. Without external sources. A photon detector was installed for simultaneous measurement. 18
19 Photon Detector A MMC chip made by KIP/Heidelberg university is used. The Si substrate is used as a photon 19 absorber. 5 mm x 5mm MMC chip Bottom side of Si substrate Bottom Side
20 Comparison of Pulse Shape for α/β 20
21 Energy spectrum Energy (kev) FWHM (kev)
22 Results of Photon Detector Measurement We succeed to measure photon signals but they were very small because of small covering area (5 mm 5 mm). α and β particle events show different light yield. Now we are developing photon detectors with Ge crystal absorber. 22
23 Outline Goals of detector development Development history Recent measurement Summary and Future plans 23
24 Summary - Comparison with other Groups Energy resolution Recent R&D result of LUCIFER group. arxiv: v1 CUORE FWHM: (6.3±2.4) 2615 kev (LTD-15 presentation) AMoRE Energy (kev) FWHM (kev) PSD Lucifer: MeV (with photon detector) CUORE: No PSD AMoRE: MeV (Phonon detector only) Rise-time (for random coincidence background rejection) CUORE, LUCIFER: >10 10 mk AMoRE: mk 24
25 Comment about energy resolution Baseline resolution is better than 1 25 mk. (3 40 mk) Signal to noise ratio is enough. Understanding position dependence is the way to improve energy resolution. Mandic, V., et al. AIP Conference Proceedings. Vol (CDMS) 25
26 Future plans Dual channel measurement with two phonon detectors. (to understand position dependence) Photon detector development with large Ge absorber. Measurement with an enriched CMO crystal. 26
27 27 Thank you!!
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