radiation induced luminescence based dosimetry for cern ... · 4/30/2020 nourdine kerboub | 30th...

Radiation Induced Luminescence based dosimetry for CERN accelerators and space applications

Nourdine KERBOUB, Diego Di Francesca, Sylvain Girard (University of Saint-Etienne), Daniel Ricci, Yacine Kadi, Rubén García Alía, Julien Mekki (CNES), Markus Brugger

4/30/2020 Nourdine KERBOUB | 30th EN-EA coffee meeting 1

Quick background

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2017 – Msc in Electronics for Embedded systems of telecommunications (including Opto-electronics) at

University of Toulouse.

• Internship at CNES, as Radiation engineer focusing on the radiation effects on electronics in Space.

In collaboration with CERN on several activities

Oct 2017 – September 2019 : CERN – EN/STI/BMI. My main activities were focused on :

• Radiation testing of electronics for the RHA plan of CERN, and external facilities cross-calibration with

our detectors. Studies of radiation effects on novel technologies.

• Radiation Induced Luminescence studies

• Space related activities at CERN such as the radiation qualification test of the CELESTA cubesat

(CERN/Univ. Montpellier) at CHARM, SpaceRadmon technical specifications, NIMPH cubesat project

follow-up.

September 2019 – Today : Phd in EN-EA – Fibre based solutions for accelerator and space applications, co-

funded by CERN and CNES, and supervised by University of Saint-Etienne.

1st May 2020 : Moving to EN-EL

Nourdine KERBOUB | 30th EN-EA coffee meeting

Phd Topic

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My Phd project focuses on the development of new fibre-based solutions for accelerator and space activities, so far

based on the RIL response of optical materials.

The main possible interesting application of such device could be :

• Accelerators domain : Time-dependent beam monitoring (Some fibres show quick response time and allow

following the temporal structure of the beam), radiation levels assessment in experiments and shielded areas

to detect beam losses (Prompt dose, RHA risks for electronics and RP implications ) …

• Space sector : Radiation assessment in satellites (lowering the mass budget dedicated to dosimetry), Solar

eruption early detection enabling quick activation of safety procedures to protect astronauts and satellites

from damages ….

Out of these domain, other promising result have been presented on the RIL dosimetry. For instance , recent works

have shown a potential for these detectors, in the measurement of the deposited dose during proton therapy

S. Girard et al., "Potential of Copper- and Cerium-Doped Optical Fiber Materials for Proton Beam Monitoring," in

IEEE Transactions on Nuclear Science, vol. 64, no. 1, pp. 567-573, Jan. 2017.


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RIE (Radiation Induced Emission) gathers several type of mechanisms generating

photon emission of the fibres during irradiation. The main RIE mechanisms of interest

for dosimetry are the following :

• RIL (Radiation Induced Luminescence)

• OSL (Optically Stimulated Luminescence)

• TSL (Thermoluminescence)

Thermoluminescence

Heating

λemission λemission λemission

Figure adapted from : S. Girard et al., "X-Rays, $\gamma$ -Rays, and Proton Beam Monitoring With Multimode Nitrogen-Doped Optical Fiber," in IEEE Transactions on Nuclear

Science, vol. 66, no. 1, pp. 306-311, Jan. 2019.

RIE phenomena introductionCourtesy of D.Di Francesca

Overview of my current activity

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July – sept 2019 : First test on thermal dependence of RIL of Gd doped rod under gammas at CERN. Preliminary

results showed a possible dependency versus temperature.

Then, in January 2020, we carried out an irradiation campaign of one month long at Saint-Etienne with the

MOPERIX machine. Several optical materials were tested to determine their RIL response temperature

dependence. Some of the samples were doped with the following dopants:

• Copper

• Cerium

• Co-doped Copper and Cerium

Doped samples of two different type were tested :

• Rods – Cylinders of 0.5 to 1 mm diameter and 1-2 cm long, connected to a pure silica transport fibre of 500

µm diameter.

• 125 µm diameter fibre obtained from the same material as the rods, connected to a MM rad-hard fibre of the

same diameter. (results not presented today)

These samples were fabricated and provided by the PhLAM laboratory of the University of Lille (France), through

the university of Saint Etienne.


Setup and facility description

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New MOPERIX machine (Not the one used in this test but very similar)

We placed the samples under test inside the machine, on a thermal

regulation plate. The X-ray tube irradiate the fibres and we read the

response of the fibres detected via a PMT (Photomultiplier), on an

oscilloscope. We also performed spectral measurement of the RIL to

gather more detailed information on the emission of the samples.


Thermal dependence of the RIL on Cu, Ce doped and CuCe co-doped rods

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The range of temperature investigated is -120 to 80 °C

(limited by the coating temperature rating ~ 85 °C).

The samples have temperature dependence, and

seems to have a similar behavior. There is no

hysteresis in the response when going from 20 to -120

°C and then to -120 to 20 °C as shown in the figure.

Figure from the submitted abstract for RADECS 2020 conference

What do we learn from this figure ?

There is a temperature dependence of the

samples RIL response over temperature.

But, this temperature dependence is

compensable if a temperature measurement is

provided.

Objective in the future : Attempt of reducing this

dependence.


Linearity of the response over dose rate for different temperatures

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The response of the samples is linear over one

dose rate decade in the range of temperature

tested (-120 to 20 °C).

In addition, in previous studies (see reference

of the abstract) the samples have shown

linearity up to 30 Gy/s (SiO2) at room

temperature.

What do we learn from the figure ?

The response of the samples remains

linear versus dose rate in the

temperature range tested.

We observe the same temperature

dependence over temperature as in

previous slide.


Spectral measurements on rods

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a) Cerium doped rod (emission

centered at 550nm)

b) Copper doped rod (emission

centered at 450nm)

c) Copper-cerium co-doped rod

What do we learn from this figure ?

Spectral measurement

confirm the temperature

dependence of the RIL. The

peak amplitude at emission

center wavelength reduces

with temperature lowering.

Possible small shift in

wavelength to be quantified

Norm. Vs peak value Norm. Vs peak value at highest T °C


Conclusion and outlooks

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The RIL response of the studied samples have a thermal dependence. Such dependence is very similar across the

three samples. The calibration of the sensor needs to take the thermal dependence into consideration. A correct

dose measurement will probably also require T °C monitoring.

This conclusion is supported by both PMT and the spectral measurement. The latter shows as well a possible small

shift of the spectra, which need to be quantified in the future.

Finally, the samples have a linear RIL response versus the dose rate, in the range of temperature tested in this study

(-120 to 20 °C).

Perspectives for the future :

• Time-resolved luminescence study, at different temperatures.

• Spectral measurements for temperatures higher than RT.

• Gamma rays irradiation

• Test of active control of temperature dependence of the RIL

• Further investigations of the fibre samples.

• Investigation towards possible reduction of the thermal dependence of the RIL response of the samples.


4/30/2020 Presenter | Presentation Title 11

Thank you to everybody and see you soon !

radiation induced luminescence based dosimetry for cern ... · 4/30/2020 nourdine kerboub | 30th...

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