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Title: Charge Collection and Electrical Characterization of Neutron Irradiated Silicon Pad Detectors for the CMS High Granularity Calorimeter

Abstract

The replacement of the existing endcap calorimeter in the Compact Muon Solenoid (CMS) detector for the high-luminosity LHC (HL-LHC), scheduled for 2027, will be a high granularity calorimeter. It will provide detailed position, energy, and timing information on electromagnetic and hadronic showers in the immense pileup of the HL-LHC. The High Granularity Calorimeter (HGCAL) will use 120-, 200-, and 300-$$\mu\textrm{m}$$ thick silicon (Si) pad sensors as the main active material and will sustain 1-MeV neutron equivalent fluences up to about $$10^{16}~\textrm{n}_\textrm{eq}\textrm{cm}^{-2}$$. In order to address the performance degradation of the Si detectors caused by the intense radiation environment, irradiation campaigns of test diode samples from 8-inch and 6-inch wafers were performed in two reactors. Characterization of the electrical and charge collection properties after irradiation involved both bulk polarities for the three sensor thicknesses. Since the Si sensors will be operated at -30 $$^\circ$$C to reduce increasing bulk leakage current with fluence, the charge collection investigation of 30 irradiated samples was carried out with the infrared-TCT setup at -30 $$^\circ$$C. TCAD simulation results at the lower fluences are in close agreement with the experimental results and provide predictions of sensor performance for the fluence regions not covered by the experimental study. All investigated sensors display 60$$\%$$ or higher charge collection efficiency at their respective highest lifetime fluences when operated at 800 V, and display above 90$$\%$$ at the lowest fluence, at 600 V. The collected charge close to the fluence of $$10^{16}~\textrm{n}_\textrm{eq}\textrm{cm}^{-2}$$ exceeds 1 fC at voltages beyond 800 V.

Authors:
 [1];  [2]; ORCiD logo [3];  [4];  [2];  [3];  [1];  [3];  [2];  [1];  [4]; ORCiD logo [1];  [4]; ORCiD logo [2]; ORCiD logo [2];  [1]; ORCiD logo [5]
  1. Texas Tech.
  2. CERN
  3. Fermilab
  4. Vienna, OAW
  5. Florida State U.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1638956
Report Number(s):
arXiv:2005.08051; FERMILAB-PUB-20-297-CMS
oai:inspirehep.net:1796823
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
TBD
Additional Journal Information:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Akchurin, N., Almeida, P., Alyari, M., Bergauer, T., Brondolin, E., Gecse, Z., Kuryatkov, V., Lipton, R., Mannelli, M., Mengke, T., Paulitsch, P., Peltola, T., Pitters, F., Sicking, E., Vicente Barreto Pinto, M., Wang, Z., and Yohay, R. Charge Collection and Electrical Characterization of Neutron Irradiated Silicon Pad Detectors for the CMS High Granularity Calorimeter. United States: N. p., 2020. Web.
Akchurin, N., Almeida, P., Alyari, M., Bergauer, T., Brondolin, E., Gecse, Z., Kuryatkov, V., Lipton, R., Mannelli, M., Mengke, T., Paulitsch, P., Peltola, T., Pitters, F., Sicking, E., Vicente Barreto Pinto, M., Wang, Z., & Yohay, R. Charge Collection and Electrical Characterization of Neutron Irradiated Silicon Pad Detectors for the CMS High Granularity Calorimeter. United States.
Akchurin, N., Almeida, P., Alyari, M., Bergauer, T., Brondolin, E., Gecse, Z., Kuryatkov, V., Lipton, R., Mannelli, M., Mengke, T., Paulitsch, P., Peltola, T., Pitters, F., Sicking, E., Vicente Barreto Pinto, M., Wang, Z., and Yohay, R. Sat . "Charge Collection and Electrical Characterization of Neutron Irradiated Silicon Pad Detectors for the CMS High Granularity Calorimeter". United States. https://www.osti.gov/servlets/purl/1638956.
@article{osti_1638956,
title = {Charge Collection and Electrical Characterization of Neutron Irradiated Silicon Pad Detectors for the CMS High Granularity Calorimeter},
author = {Akchurin, N. and Almeida, P. and Alyari, M. and Bergauer, T. and Brondolin, E. and Gecse, Z. and Kuryatkov, V. and Lipton, R. and Mannelli, M. and Mengke, T. and Paulitsch, P. and Peltola, T. and Pitters, F. and Sicking, E. and Vicente Barreto Pinto, M. and Wang, Z. and Yohay, R.},
abstractNote = {The replacement of the existing endcap calorimeter in the Compact Muon Solenoid (CMS) detector for the high-luminosity LHC (HL-LHC), scheduled for 2027, will be a high granularity calorimeter. It will provide detailed position, energy, and timing information on electromagnetic and hadronic showers in the immense pileup of the HL-LHC. The High Granularity Calorimeter (HGCAL) will use 120-, 200-, and 300-$\mu\textrm{m}$ thick silicon (Si) pad sensors as the main active material and will sustain 1-MeV neutron equivalent fluences up to about $10^{16}~\textrm{n}_\textrm{eq}\textrm{cm}^{-2}$. In order to address the performance degradation of the Si detectors caused by the intense radiation environment, irradiation campaigns of test diode samples from 8-inch and 6-inch wafers were performed in two reactors. Characterization of the electrical and charge collection properties after irradiation involved both bulk polarities for the three sensor thicknesses. Since the Si sensors will be operated at -30 $^\circ$C to reduce increasing bulk leakage current with fluence, the charge collection investigation of 30 irradiated samples was carried out with the infrared-TCT setup at -30 $^\circ$C. TCAD simulation results at the lower fluences are in close agreement with the experimental results and provide predictions of sensor performance for the fluence regions not covered by the experimental study. All investigated sensors display 60$\%$ or higher charge collection efficiency at their respective highest lifetime fluences when operated at 800 V, and display above 90$\%$ at the lowest fluence, at 600 V. The collected charge close to the fluence of $10^{16}~\textrm{n}_\textrm{eq}\textrm{cm}^{-2}$ exceeds 1 fC at voltages beyond 800 V.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {5}
}