Radiation hardness study of Silicon Detectors for the CMS High Granularity Calorimeter (HGCAL)

The high luminosity LHC (HL-LHC or Phase-II) is expected to increase the instantaneous luminosity of the LHC by a factor of about five, delivering 0~25 fb super(-1) per year between 2025 and 2035. Under these conditions the performance degradation of detectors due to integrated radiation dose/fluenc...

Full description

Saved in:
Bibliographic Details
Published in:Journal of instrumentation 2017-02, Vol.12 (2), p.C02056-C02056
Main Authors: Currás, E., Mannelli, M., Moll, M., Nourbakhsh, S., Steinbrueck, G., Vila, I.
Format: Article
Language:English
Subjects:
Capacitance
Detectors
Irradiation
Luminosity
Neutron irradiation
Sampling
Sensors
Silicon
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The high luminosity LHC (HL-LHC or Phase-II) is expected to increase the instantaneous luminosity of the LHC by a factor of about five, delivering 0~25 fb super(-1) per year between 2025 and 2035. Under these conditions the performance degradation of detectors due to integrated radiation dose/fluence will need to be addressed. The CMS collaboration is planning to upgrade many detector components, including the forward calorimeters. The replacement for the existing endcap preshower, electromagnetic and hadronic calorimeters is called the High Granularity Calorimeter (HGCAL) and it will be realized as a sampling calorimeter, including 40 layers of silicon detectors totalling 600 m super(2). The sensors will be realized as pad detectors with cell size between 0.5 and 1.0 cm super(2) and an active thickness between 100 [mu]m and 300 [mu]m depending on their location in the endcaps. The thinner sensors will be used in the highest radiation environment. For an integrated luminosity of 3000 fb super(-1), the electromagnetic calorimeter will have to sustain a maximum integrated dose of 1.5 MGy and neutron fluences of 1.0x10 super(16) n sub(eq)/cm super(2). A tolerance study after neutron irradiation of 300 [mu]m, 200 [mu]m, 100 [mu]m and 50 [mu]m n-on-p and p-on-n silicon pads irradiated to fluences up to 1.6x10 super(16) n sub(eq)/cm super(2) is presented. The main properties of these diodes have been studied before and after irradiation: leakage current, capacitance, charge collection efficiency with laser and sensitivity to minimum ionizing particles with radioactive source ( super(90) Sr). The results show a good performance even after the most extreme irradiation.
ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/12/02/C02056