1. 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

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

3. The RADMON project RadFET RADMON carrier board pin diode TID [Gy]
Project born to fulfill radiation damage monitoring needs in the LHC experiments.
Characterization of several sensor types (F.Ravotti PhD thesis1,2006) to measure total ionizing dose (TID) and fluence.
4 devices selected (2 radFET, 2 pin diodes) & design of a carrier board.
Easy readout schema  for all devices, dosimetry information can be obtained injecting a current pulse and measuring the voltage.
RadFET
TID [Gy]
RADMON carrier board
pin diode
Φeq [neq/cm2] IR
-Vo IR Vo
1Development and Characterisation of Radiation Monitoring Sensors for the High Energy Physics Experiments of the CERN LHC Accelerator; F.Ravotti, 2006.

4. The RADMON project (II)
~250 RADMON boards installed in the experiments and LHC tunnel (complex, distributed readout integrated in the DCS)
IRRAD team provides replacement sensors to the LHC but also to other experiments from CERN and outside
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)

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

6. EP-DT RADMON reader capabilities
Example: RADMON BPW sensor calibration curve
∆V [V]
Operational range
Current supply
100 μA – 32 mA
Voltage readout
0 – 125 V
Min. pulse width
100 ms
EP-DT
RADMON reader
(125V)
100
LHC readout
(30V)
Full operational range 10
One order of magnitude gain in φeq readout range with respect to the LHC system! 1
Φeq [neq/cm2]
1013
1014
1015
2 x 1014
> 1015

7. EP-DT RADMON reader architecture
Total number of channels: 4 x 11

8. 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

9. Tests in (irradiation 2016)
Main purpose: proof of concept and debugging of the system
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%

10. Results out of dosimeter range REM250-K3 RadFET
Low sensitivity, broad range
TID[Gy]
SEC ( x 107)
(Preliminary)
Time [days]
Si-2 pin diode
High sensitivity, short range
Φeq[neq/cm2]
SEC ( x 107)
out of dosimeter
range
Time [days]

11. Low sensitivity, broad range
Results – BPW in beam
BPW pin diode
Low sensitivity, broad range
(Preliminary)
No annealing correction
Better fit possible
Φeq[neq/cm2]
SEC ( x 107)
Time [days]

12. 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

13. The team thanks you for your attention!!!