Development of electronics for radiation monitoring and solid state detector R&D Isidre Mateu Suau (EP-DT-DD) Supervisors: Michael Moll, Federico Ravotti FTEC 3rd workshop 28/11/2016

RADIATION DAMAGE STUDIES IN SILICON SENSORS(EP-DT-DD) Outline RADIATION DAMAGE STUDIES IN SILICON SENSORS(EP-DT-DD) Activities in the Solid State Detectors (SSD) team Cryostat upgrade Research projects Activities in the Irradiation Facilities (IRRAD) team RADMON portable readout system NIEL calibration Future work

ACTIVITIES in the SSD team

Cryostat upgrade - Overview Closed-cycle helium cooling machine. Purpose: characterization of radiation induced defects on silicon From 20K to room temperature with a controlled heating rate (11K/min) Error in the temperature measurement & slow response PCB substrate non conductive Heat flow through cables 𝐼𝐿(𝑇)∝ 1 𝑇 2 𝑒 − 𝐸 𝑔 2 𝑘 𝐵 𝑇 CONCLUSION: RE-DESIGN OF THE SAMPLEHOLDER FROM SCRATCH (Since april: design & prototype work) Sensor colder than DUT when warming up ~6K

Connexion to PCB using spring loaded contacts Cryostat upgrade – New concept New design aims for: Low mass – Fast response to ∆T High thermal conductivity of PCB Low thermal leakage through cabling Plug & play Challenge: PCB compatible with the rest of setups in the laboratory! Minimize copper mass PCB Alumina substrate Detector Reduced PCB size (no SMA connectors) Support frame Pressing mechanism Sample-holder Connexion to PCB using spring loaded contacts Stainless steel micro-coax to cryostat flange Cryostat tip

Preliminary design To be refined (support by EP-DT-CO) Cryostat upgrade – List of tasks Design & production of ceramic PCB prototype  Signal integrity test w. picosecond laser illumination  Test in cryocooler (proof of concept)  PT1000 calibration down to 10K  Do we really need the temperature reference sensor? Final PCB & mechanical design  Preliminary design To be refined (support by EP-DT-CO) ~2K

Research projects & other tasks New project: study of defects in very thin silicon sensors (down to 50um thickness, different types, resistivity…) Characterization before and after irradiation Use of the Cryostat for defect characterization Study of charge detrapping times at low T, using CW (LED) illumination Setup upgrade: CV-IV measurements in cold chamber Replication of an existing setup Some Labview code adaptation needed

ACTIVITIES in the IRRAD team

RADMON project – Overview Development of dosimeters (PIN diodes and RadFETs) for monitoring dose and fluence. Many RADMON boards installed in the LHC experiments Readout integrated in the detector control system My task: to develop a portable readout system for “small installations” Project on the side, ongoing since many years Last meeting: Full characterization of the system DC-DC converter Conclusion: it can be used if some readout timing constraints are relaxed

RADMON project – Recent evolution Added some additional circuitry to protect the dosimeters when switching from one to the other First implementation of the readout protocol Very basic: infinite loop with the readout of a full RADMON board Measurements sent to database Online data visualization First “functional” prototype installed in IRRAD Very helpful for debugging (HW & SW) Finally, quite steady data acquisition. http://ps-irrad.web.cern.ch/Radmon/YUN/viewYun.php

RADMON project – Current work Work on the software part to have a stable system with a webDAQ Web DAQ HTML Assign profile to dosimeter Activate/desactivate dosimeter … Create readout profile Linino Profiles.php ConfigReadout.php Radmon-daemon.php Arduino sketch Wait for instructions Readout dosimeter Send to DB VisuData.php profile1.txt profileN.txt SQL database SD card

NIEL calibration T = 20oC After 80 min. @60oC к = 0.58 Non ionizing energy loss (NIEL) hypothesis: displacement damage effects scale linearly with the amount of energy imparted in displacing collisions. We study how the leakage current scales with fluence, for comparison with other irradiation facilities (different particles, energies) Irradiation of different sets of diodes at several fluences for this study  Data analysis still on-going T = 20oC After 80 min. @60oC к = 0.58

Conclusions Solid State Detectors (SSD) team Ceramic PCB prototype produced and tested Proof of concept of the new sample-holder concept in the cryostat Next… Enter the final design phase of the sample-holder Operation of the setup for the different research projects on-going (thin sensors, LED illumination, etc) Data analysis software Irradiation facilities (IRRAD) team RADMON portable readout system prototype installed and tested in IRRAD Develop a second prototype version of the RADMON readout to test in the next irradiation campaign (Spring 2017) Installation of the current prototype in GIF++ during winter break Analysis of RADMON data in the LHC