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First measurement Results from DANAE - Demonstrating DePFET RNDR on a prototype Matrix
by Alexander Bähr, Holger Kluck, Peter Lechner, Jelena Ninkovic, Jochen Schiek, Hexi Shi, Wolfgang Treberspurg, Johannes Treis
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Submission summary
| Authors (as registered SciPost users): | Alexander Bähr |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202211_00018v1 (pdf) |
| Date submitted: | 2022-11-09 17:18 |
| Submitted by: | Bähr, Alexander |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 14th International Conference on Identification of Dark Matter (IDM2022) |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Experimental |
Abstract
In the search for dark matter particle candidates, the mass region below 1 GeV/c2 is relatively unprobed. Utilizing a low-noise silicon sensor as sensitive target material, we aim to study the event signature of recoils between dark matter candidates and bound electrons. As the deposited energy is only a few eV, a sensor capable of detecting these low signals is required. We present first measurements on a prototype pixel matrix. It is based on the RNDR DePFET principle and provides a deep sub-electron readout noise of 0.2 e- and below.
Current status:
Reports on this Submission
Anonymous Report 1 on 2022-11-28 (Invited Report)
- Cite as: Anonymous, Report on arXiv:scipost_202211_00018v1, delivered 2022-11-28, doi: 10.21468/SciPost.Report.6220
Strengths
The paper mostly concentrate on the first measurements done to test the prototype. The text is well written.
Report
I recommend to apply some minor changes bellow.
Requested changes
- “as sensitive target material “ -> “as a sensitive target material ”
- “scattering of a Dark Matter particle on an electron is possible ” - please provide a ref.
- “The long-term objective of DANAE is” - can you explain what is DANAE (abbreviation, experiment, project)?
- “large volume silicon detector ” - dimensions will be useful here
- “-200°C” - provide in brackets the corresponding value in K
- “Next the collected signal is read out. For the readout …” - if it is possible avoid read out and readout close to each other.
- Fig.2 provide more details for (b).
- “We selected events ” - “We have selected events ”
- “In addition to the signal, charge can be generated by thermal excitation, leading to leakage current and, furthermore, charge can be generated during the switching of the DePFETs gate by impact ionization – similar to the effect known as spurious charge generation in CCDs [7].” - “charge can be generated” second time is not necessary.
- “This implant serves as transfer channel ” - > “This implant serves as a transfer channel ”
- Fig. 3, I would use italic for colors.
- “neglect events” ??
- For the last section “summary” I would recommend to provide a comparison of achieved “low readout noise” to used by others. A few word on future plans would be interesting too.
Author: Alexander Bähr on 2022-12-14 [id 3135]
(in reply to Report 1 on 2022-11-28)Thanks for your suggestion. I implemented all, I'm only having difficulty to understand what you suggest with:
"For the last section “summary” I would recommend to provide a comparison of achieved “low readout noise” to used by others."
Could you elaborate? Thanks.
Anonymous on 2022-12-18 [id 3143]
(in reply to Alexander Bähr on 2022-12-14 [id 3135])Dear author,
the intention of the comment was to give a reader understanding how "low"the level of readout noise in comparison with similar experiments, set-ups, devices etc.
Anonymous on 2022-12-20 [id 3163]
(in reply to Anonymous Comment on 2022-12-18 [id 3143])Thanks for the clarification. I revised the Summary to read, referencing published performance of a skipper CCD:
We presented first measurements on a small prototype DePFET RNDR matrix of 64×64 pixels.
As anticipated, the matrix can provide low readout noise of 0.23e− at 100 repetitions and
0.14 e− at 800 repetitions, similar to skipper CCDs [9] but limited by charge generation as well
as charge losses for this prototype. At this stage we can detect these events and remove them
from the data. The limitations will be mitigated by an optimized technology and operation
conditions for a next generation of RNDR DePFETs. Further qualification of the current device
will also include more advanced readout schemes with sparse clear only every few frames,
providing an incremental readout of the collected charge. In the long term we plan to assemble
a RNDR based sensor array with a mass of several grams of sensitive volume.
Attachment:
IDM_paper.pdf
Anonymous on 2022-12-21 [id 3167]
(in reply to Anonymous Comment on 2022-12-20 [id 3163])Thank you. Please resubmit the new version using resubmission process.