Compact readout unit for the EPRADMON radiation monitoring

Compact readout unit for the EP-RADMON radiation monitoring sensors Blerina Gkotse, Maurice Glaser, Georgi Gorine, Ugur Kilic, Isidre Mateu, Giuseppe Pezzullo, Federico Ravotti EP-DT-DD section meeting 17/03/2017

Outline 1. 2. 3. 4. The RADMON project EP-DT RADMON reader Tests in IRRAD Conclusions 2

The RADMON project Ø Project born to fulfill radiation damage monitoring needs in the LHC experiments. Ø Characterization of several sensor types (F. Ravotti Ph. D thesis 1, 2006) to measure total ionizing dose (TID) and fluence. Ø 4 devices selected (2 rad. FET, 2 pin diodes) & design of a carrier board. Ø Easy readout schema for all devices, dosimetry information can be obtained injecting a current pulse and measuring the voltage. Rad. FET TID [Gy] IR 1 Development -Vo pin diode Φeq [neq/cm 2] RADMON carrier board IR Vo and Characterisation of Radiation Monitoring Sensors for the High Energy Physics Experiments of the CERN LHC Accelerator; F. Ravotti, 2006. 3

The RADMON project (II) Ø ~250 RADMON boards installed in the experiments and LHC tunnel (complex, distributed readout integrated in the DCS) Ø IRRAD team provides replacement sensors to the LHC but also to other experiments from CERN and outside Ø The dosimeters can be used as passive devices (offline readout using a dedicated testbench in IRRAD) RADMON board installed on a TOTEM roman pot TOTEM readout system Dosimetry results in PHENIX experiment (BNL) 4

EP-DT RADMON reader Ø Need for a portable readout system providing an on-line measurement Ø Development of a compact, low cost system started more than 10 years ago, with successive contributions from different students Ø The system exploits the full range of operation of all RADMON dosimeters Ø Last year a ”proof of concept” prototype was successfully tested in IRRAD Laboratory test-bench Portable EP-DT RADMON reader 5

EP-DT RADMON reader capabilities Example: RADMON BPW sensor calibration curve ∆V [V] Operational range EP-DT RADMON reader (125 V) 100 Current supply LHC readout (30 V) 100 μA – 32 m. A Voltage readout 0 – 125 V Min. pulse width 100 ms Full operational range 10 One order of magnitude gain in φeq readout range with respect to the LHC system! 1 1013 1014 2 x 1014 1015 > 1015 Φeq [neq/cm 2] 6

EP-DT RADMON reader architecture ~100 m Total number of channels: 4 x 11 7

Towards a first prototype… • Full characterization of the power supply unit to validate it against the readout protocols defined for every dosimeter • Basic web interface to remotely configure data acquisition and storage • Assembly of a prototype and tests in IRRAD (2016) and GIF++ (ongoing) Interface – profile manager Interface – readout configuration 8

Tests in (irradiation 2016) Ø Main purpose: proof of concept and debugging of the system Ø Comparison of final dose with passive dosimeters RADMON board Patch panel Passive dosimeters Control room 1 BPW In beam Beam area System prototype Beam Device TID after 35 days [Gy] RADMON reader (REM) 170 ± 15% RPL 205 ± 20% 9

Results out of dosimeter range TID[Gy] SEC ( x 107) REM 250 -K 3 Rad. FET Low sensitivity, broad range out of dosimeter range Time [days] SEC ( x 107) Φeq[neq/cm 2] y) ar in lim re (P Time [days] Si-2 pin diode High sensitivity, short range 10

Results – BPW in beam BPW pin diode Low sensitivity, broad range SEC ( x 107) Φeq[neq/cm 2] y) ar in lim re (P No annealing correction Better fit possible Time [days] 11

Conclusions • Portable RADMON reader development is ongoing in IRRAD • Proof of concept validated last year in IRRAD • KT fund proposal to be defended next week • Future steps • • System optimization New test during irradiation campaign 2017 Further development of the web interface Integration of all the parts in a compact housing with a single PCB 12

The team thanks you for your attention!!! 13