Speaker
Description
Authors: Anup Kumar Sikdar1,∗, Arun Kumar Yadav1,3, Sanjib Muhuri1,3,
Jogender Saini, Zubayer Ahammed1,3, Anamika Pallavi1, Subikash Choudhary4,
Sudhirsinh Vala5
1 EHEPAG, Variable Energy Cyclotron Centre, Kolkata - 700064, INDIA
2 Bhabha Atomic Research Centre, Mumbai - 400085, INDIA
3 Homi Bhabha National Institute, Mumbai - 400064, INDIA
4 Jadavpur University, Kolkata - 700032, INDIA
5 Institute for Plasma Research, Gandhinagar - 382428, INDIA
∗Corresponding Author: anup.ks@vecc.gov.in
Abstract: The intense particle flux at the HL-LHC poses a significant challenge to the ALICE detector’s technology and advanced electronics, especially in the forward region where granular segmentation is essential for probing the unexplored low-x physics domain. To address this, ALICE plans to install a forward calorimeter (FoCal) consists of electromagnetic (FoCal-E) and Hadronic (FoCal-H) parts, designed to cover pseudorapidities in the range of 3.4< η <5.8. The FoCal-E will be a silicon-tungsten (Si+W) sampling calorimeter with a hybrid architecture, incorporating two types of silicon readout technologies: pad layers with transverse cell dimensions of approximately 1 × 1 cm2, and pixel layers with cell sizes around 30 × 30 μm2 [1]. P-type silicon pad layer detectors are designed, developed and fabricated by INDIA-ALICE collaboration where VECC has played a pivotal role to each aspect of the project.
This study focuses on the radiation tolerance of p-type silicon detectors,
specifically with 4 single-pad test detectors each with an area of 1 × 1 cm2 taken from same wafer of 8 × 9 detector array meant for the experiment. These test detectors were exposed to different irradiation doses of neutron to mimic the damage expected during HL-LHC data-taking from 2029 to 2035. We performed quality assessments of the detectors like thickness and resistance uniformity along with temperature sensitivity and evaluated their performance by analyzing leakage current behavior under varying bias voltages. Performance of the irradiated sensors over time under different bias scheme are measured and compared to non-irradiated reference sensors. This investigation provides insights into the radiation-induced degradation of silicon sensors throughout the operational period and supports strategies for mitigating these effects to maintain long-term detector stability and reliability. Additionally, the analysis includes a quality check of the front-end electronics, with the latest version of the HGCROC’s capability for fast signal processing in high-radiation environments. A detailed technical aspects of detector and its performance against radiation damage along with the current status of the project will be presented.
References
[1] ALICE Collaboration. “Technical Design Report of the ALICE Forward
Calorimeter (FoCal)”. In: ALICE-TDR-022. Ed. by CERN-LHCC-2024-
004. July 17, 2024. url: https://cds.cern.ch/record/2890281/files/
ALICE-TDR-022.pdf.
| Position | Research Associate |
|---|---|
| Affiliation | Variable Energy Cyclotron Centre |
| Country | India |
