Daniel Roach

Back to work!

Favourite Thing: I love it when, after spending ages trying to find out where I’ve made a mistake in my computer program, I find it (usually something dumb!) and… it works! But nothing quite beats being the very first person to see something or understand something … it doesn’t happen very often, but the goosebumps you get are way worth the effort!



University of Salford, University of Toledo (a year in America)


MPhys Physics (Computational), PhD Physics

Work History:

BNFL (Sellafield and Springfields), University of Salford

Current Job:

Research Fellow


University of Salford

Me and my work

I ring teeny, tiny ‘bells’ (crystals and molecules) with neutrons; the ‘sound’ they produce tells me what the atoms are doing, and that is sometimes very strange things.

As a computational physicist, my job involves trying to understand very complicated imformation by applying simple rules in a computer program and then seeing if this makes the complicated things any easier to understand…  Sometimes this just results in me confusing myself, but I’ve managed to make some progress:)

I study the vibrations in crystalline materials, usually crystalline powders (common table salt is an example of a powder crystal, or ‘polycrystal’).  The usual way to do this is to get a big single crystal (like a diamond, or the big salt crystals you can grow in your airing cupboard with time and patience) and put it in a machine and fire neutrons at it.  These neutrons hit the atoms in the crystal and produce vibrations (just like ringing a bell) – we use big detectors to detect the neutrons as they bounce off the crystal atoms and from this we can ‘listen’ to the tones that are produced by these tiny bell-ringing hammers. This tells us all sorts of information about how the atoms stick together (the forces between them) and we can use this information to understand why materials have the properties they do.  Sometimes, we find very unexpected things – and these discoveries give us information on how the Universe (on the very small scale) operates as well as giving us information we need to design and build clever new materials that we can use to solve big problems.

However, most materials just don’t like to grow into big crystals, and prefer to remain as powdery small crystals, all jumbled up (just like the salt you put on your chips).  But with careful use of computer software, we can build up models of how the atoms stick together and move. We then use the computer to calculate what the machine would see if it were a real experiment.  If it’s the same -great, we can say that we understand how that material is stuck together.  But often, things are a bit different (or a lot different!).  In this case, we use the differences between the computer-predicted information and the real-life information we get from the neutron ‘bell-ringing’ machine to help us go backwards and change the models. The information the computer calculates is changed so it matches what the real machine (known as an ‘instrument’) sees.  If we do this carefully (which can take a while, even for a really big computer – and the computers used at neutron labs like ISIS are BIG), then we end up with a model of a material which explains what happens in the instrument AND gives us a way of understanding how that material sticks together and moves.  After all, the atoms in the crystal are really, really small so we can’t just poke them with a stick and watch the atoms move – we have to use our knowlege of physics to solve the problem.

This is what I do… I use computers, and my knowledge of physics, to try to understand what is going on in these neutron instruments and, in doing so, find new ways of getting simple understanding from complicated information.  I do this by writing software programs which I (and other scientists) can use to do this, and by going to neutron labs like ISIS to do the experiments and gather the information I need to test my computer ‘predictions’.  It might sound a bit boring, but it really isn’t – work is play for me (most of the time, anyway) and it’s great to be able to do something you love and get to pay your bills doing it!

My Typical Day

I come to work, cup of tea and… wait, it’s dark outside already?

I’ll come in to work (I tend to work late into the evening, so sometimes I’m not in work until midday!), put the kettle on and check my emails.  I work with other scientists all over the world, and we talk about the problems we have.  If I’m stuck (and that happens a lot), I can go read what other scientist have done (usually on the internet) or even ask other scientists what they think – this is called “collaboration” and it’s one of the most enjoyable parts of my job, because I’m never really alone.  I can always ask people for their opinions and they can do the same with me.  This part of the day usually takes an hour or two, depending on how many problems need to be sorted.

I teach University physics students, and also help PhD students (who have finished their first degrees and are now learning how to do research) with their work some days.  Most days, however, I get onto my computer, work out where I left off the previous day and get thinking.

My work involves trying to look at information (data) using lots of colourful plots and writing software programs to help me understand how atoms move together.  This usually requires a lot of concentration, but I really enjoy it – it’s very much like a big puzzle. I break down the big puzzle into lots of smaller puzzles and try to solve those before I put it back together again.  Just like when you’re playing a computer game and you’re really into it, you soon lose track of time and before you know it, it’s dark outside (even in the summer!) and my stomach tells me it’s time to feed it.  Then, once I start feeling tired, I make notes of where I’ve got to and off I go home.

Of course, some days I’m travelling to give talks to scientists around the world, or I’m visiting a lab to do an experiment or I’m off to visit a scientist I’m working with to see if he has a better way of solving a particularly stubborn puzzle.  But these, whilst common, are not really typical working days for me.  These are for me, my computer and my kettle:)

What I'd do with the money

I’d use the money to fund visits to ISIS, Rutherford Labs and Diamond for Salford school kids (an inner city area)

Science is important, but Materials Science is critical to our society, yet few kids at school seem to know how important and exciting materials science and the physics behind it really is!  The UK has some of the world’s most impressive facilities for studying the ways in which atoms and molecules stick together, move and respond to light, magnetism, heat, pressure… the list goes on and on.  Yet our modern world is continually built and our futures shaped by these remarkable discoveries – your typical smart phone, with it’s compact, long life battery, it’s clever LCD screen, the antenna – even the screen (that if you’re not careful, you’ll drop on the floor and crack – oh well, room for more science, there!)… All of this has been brought to you by the scientists who work on understanding, making and even designing new materials.

A trip to ISIS and Diamond at the Rutherford Appleton Laboratories give the opportunity for school kids to see the amazing, space-aged facilities in this world-leading hub of materials science; you can even get to meet and interact with scientists responsible for some of the materials you will likely have built into your phone! You get to see the amazing machines that probe the very smallest, coldest, hottest and toughest chunks of matter, you get to hear from world-renowned scientists who are at the very top of the profession and ask them questions.

This kind of visit would be very valuable for kids from the poorest inner-city areas of Salford (the city right next to Manchester) – it provides insight into how science is relevant to THEIR lives and yours. Hey, the Diamond facility even looks like a huge spaceship that’s landed in a field! And most importantly, it gives the kids from backgrounds that are less advantaged (in terms of educated parents or standard of living) hope that they can make a good living from doing science – as someone from a working-class background, this is important to me, and there are plenty of scientist like me from similar backgrounds who engaged with science at school and now get to play with big machines with flashing lights on them for a living!

My Interview

How would you describe yourself in 3 words?

Intense, Curious, Humorous

Who is your favourite singer or band?


What's your favourite food?

Dim Sum

What is the most fun thing you've done?

I kept a pet ferret for years… He was always loads of fun, although he did have a habit of using my trainers as a toilet!

What did you want to be after you left school?

A Physicist

Were you ever in trouble in at school?

Rarely – I loved school and my teachers were great, so I’d be reluctant to upset them. Usually:)

What was your favourite subject at school?

Physics, but I also loved English.

What's the best thing you've done as a scientist?

I worked out how to interpret vibrations in crystal powders; normally, you need single crystals to do that properly.

What or who inspired you to become a scientist?

An amazing book, and TV series, called ‘Cosmos’ by Carl Sagan. Brilliant stuff.

If you weren't a scientist, what would you be?

I’d probably be a Kung Fu instructor, full time. Really!

If you had 3 wishes for yourself what would they be? - be honest!

To do my job for the rest of my life. That I live a long and healthy life. That I always have something to learn.

Tell us a joke.

Q: What would you get if you crossed a vampire and a teacher ? A: Lots of blood tests !

Other stuff

Work photos:

myimage1My desk…  It’s got my lovely workstation so I can keep all the data I need in front of me.  I love my computer:)

myimage2A picture of the LET instrument (the big purple box thing as tall as a house) – an amazing piece of scientific equipment called an “Inelastic Chopper Spectrometer” – a formal name for a “big-machine-that-is-used-for-tiny-bell-ringing-with-neutrons”… the scientific name is shorter!  This is at a place called ISIS, at the Rutherford Appleton Laboratories, near Oxford. That other purple box to the left is the computer that is needed just to run this instrument.  When you walk into it, it’s wall-to-wall flashing blue lights, just like you’d see on a science fiction film.  I visit ISIS a lot to use their neutron scattering instruments, like LET here, and it’s always exciting.

myimage3 A quick snap picture taken from the ‘plane as we land in Los Angeles at night.  When you land in LA, especially at night, the city seems to go on for ever, and as it’s America, all the roads are brightly lit and very straight. We were visiting other scientists at a famous university called CalTech.  I travel lots in my work – America, Australia, the Far East and in Europe.  It’s one of the coolest parts of my job.

And finally… myimage4

My ferret, Boris.  He isn’t strictly relevant to my work, but he helped me get through some tough times!