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Shahnaz Hoque

Nuclear Fusion Specialist

My parents emigrated from a village in Bangladesh to London, where I was born. I grew up on a council estate there and went to a school where we had one teacher for every subject. My parents divorced, so I moved with my mum and changed schools, while my dad and brother moved to Qatar.

I always loved school because I could keep learning things constantly while everything else in my life changed. Because of this, in secondary school I loved every subject. However, it was in science that I never ran out of questions and curiosity. I learnt about nuclear fusion then and immediately knew it was something I wanted to be part of.

I worked hard to get the top GCSE grades at school, a bursary to study at a top private school for free to do my A-levels, and a place to study for a Masters in Nuclear Engineering at the University of Birmingham, where I was the only woman on my course. I loved my degree, because I was finally able to learn what I needed to help fight climate change in the best way I thought. I was the only Black, Asian and Minority Ethnic (BAME) woman on my course in its first year of existence, making me one of the first BAME women with an undergraduate Masters in Nuclear Engineering in the UK.

After university, I worked in the nuclear industry alongside a few BAME female engineers to help build the first nuclear fission reactor in the UK for a generation, but I still dreamt about being part of the race for nuclear fusion. I left my job to do a PhD at the University of Oxford, investigating materials for nuclear fusion reactors and finally my dream has come true. I feel very privileged to be a BAME woman from a working class, immigrant family, raised by my mum alone and also at the best university in the world, able to follow my lifelong dream. I hope to help the next generation of BAME people in the UK who love anything in STEM to follow their dreams too, despite the difficulties we face as the minority here.

In the future, it is predicted that energy from nuclear fusion will power the world instead of fossil fuels. Fusion does not emit any greenhouse gases and the hydrogen fuel it uses is virtually limitless – helping us in the fight against climate change. Researchers have been searching for the best way to build a nuclear fusion reactor for generations.

What is nuclear fusion?

Nuclear fusion is when the non-pollutive gas hydrogen is heated up to approximately 150,000,000°C – ten times hotter than the centre of the Sun. The particles in it then have enough energy from the heat to fuse together and make helium gas – which rarely reacts with anything – and a neutron. The nuclear fusion reaction is the most energetic in the universe and what is happening in stars like the Sun.

How do we get energy from fusion?

When hydrogen fuses, helium and a neutron are created. A neutron is an extremely small particle that is part of almost every atom of every element in the universe. After it is created from hydrogen fusion in the reactor core, it has lots of energy which propels it into the reactor walls. It hits the wall and transfers its energy to the materials inside. If a liquid (like water) is put in the walls through pipes, the water heats up using the energy from the millions of neutrons hitting it. The hot water is carried away as it transitions to steam, which turns a machine, generating electricity (much like a wind-turbine).

Why fusion?

There are no fossil fuels and very little highly radioactive nuclear fuel waste to worry about, unlike with nuclear fission reactors. Moreover, a very small amount of hydrogen (about a bathtub’s worth) can produce your entire life’s electricity needs! By building a fusion reactor on Earth, we can copy the Sun to give us clean and virtually unlimited energy for generations.

What do I do?

I investigate the effects of radiation on steel which will be used to build nuclear fusion reactors, to make them safer and longer lasting. My research helps develop fusion energy – a clean, safe and efficient way to produce electricity. I am trying to learn how the neutron from the reaction changes the structure of the steel used to build the reactor walls, so I can help other scientists and engineers design the best steels to use for building one.

Radiation damage

The walls of a nuclear fusion reactor will be built from steel. They will be hit with millions of neutrons from the fusion reaction, which can change the structure of the steel so it has different properties. If you look at fusion steel under a very powerful microscope, you can see it is made of lots of particles of iron, chromium, carbon and many other elements, arranged in a crystal lattice.

When a fusion neutron with lots of energy hits the steel, it moves the particles out of their places, rearranging the crystal structure and creating defects called ‘dislocations.’ Dislocations are areas where the particles are out of their normal positions and can be a sign of radiation damage.

Shahnaz Hoque
Nuclear Fusion Specialist