Skip to main content

Reliability study of custom designed ADC for the Jiangmen underground neutrino observatory



The Jiangmen underground neutrino observatory (JUNO) is the largest and most precise liquid scintillator detector under construction in the south of China. The front-end readout electronics system will be installed very close to the photomultiplier tubes under water. Therefore, the system’s absolute reliability is mandatory. As an important piece, the failure rate of the custom designed analog-to-digital convertor (ADC) must be measured.


The Arrhenius High Temperature Operating Life (HTOL) model is usually used to calculate the standard reliability value failure rate (\(\lambda \)). A temperature acceleration test of the ADC is performed with a 115 \(^{\circ }\)C ambient temperature based on a custom aging system. The performance of ADC is compared before and after aging, and the most significant bit (MSB) of the digital output is monitored during the test.


The result of a 2400-hour-long test shows that there were no failures. The upper limit of the failure rate is calculated as 5.8FIT, which can be added to the failure rate of other components to meet the overall failure rate requirements (84FIT).


With the test system, we established a method based on the HTOL model to obtain the upper limit of the ADC reliability for overall failure rate calculation in JUNO. This method can be applied to the reliability measurement for any other custom designed ADC. This experiment can be repeated with a new set of parameters to get a satisfactory failure rate according to other overall system requirements.

This is a preview of subscription content, access via your institution.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10


  1. Y.F. Li, J. Cao, Y. Wang, L. Zhan, Unambiguous determination of the neutrino mass hierarchy using reactor neutrinos. Phys. Rev. D 88, 013008 (2013).

    ADS  Article  Google Scholar 

  2. F.A. et al., J. phys. G 43(3), 030401 (2016). arXiv:1507.05613

  3. P.D.T. O’Connor, Practical Reliability Engineering, 4th edn. (Wiley, New York, 2010)

    Google Scholar 

  4. lq Li, Handbook of Certified Reliability Engineer, 2nd edn. (China Renmin University Press, Beijing, 2017)

    Google Scholar 

  5. D. Pedretti et al., The global control unit for the JUNO front-end electronics. Spr. Proc. Phys. 212 (2018)

  6. W.B. Nelson, Accelerated Testing-Statistical Models, Test Plans & Data Analysis (Wiley, New York, 2004)

    Google Scholar 

  7. P. Ellerman, Calculating reliability using FIT & MTTF: arrhenius HTOL model. MicroNote 1002 (2012)

  8. P. Ellerman, Calculating chi-squared (\({X}^2\)) for reliability equations. MicroNote 1003 (2012)

Download references


Funding was provided by suresh (Grant No. Y32CA16029).

Author information

Authors and Affiliations


Corresponding author

Correspondence to Jun Hu.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Jin, Ry., Hu, J., Ren, Jy. et al. Reliability study of custom designed ADC for the Jiangmen underground neutrino observatory. Radiat Detect Technol Methods 4, 203–207 (2020).

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI:


  • ADC
  • Reliability
  • HTOL
  • Failure rate