Coffee meeting

Maarten van Dijk (EN-EA-LE)28-02-2019

Who? Me?

• BSc / MSc: Delft (NL) - 2011

• PhD: University of Bristol (UK) – 2016

• @ CERN: 2009 – now

• Full-time at CERN since 2016

• In EN-EA since 2017

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• Netherlands: Den Haag(The Hague? Die Hage? La Haye?)

Main activities

• Coffee drinking

• Asking difficult questions about collimators

• Digging through the archive for drawings

• …..but what was all of that really good for?

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Simulating experimental areas

• My main tool: FLUKA

• It was the best of times, it was the worst of times

• Shoot a particle into a thing, easy!

• But simulating a particle alone is never enough

• What secondary beam do you have after the target?

• How can you dump the beam?

• How much radiation is produced and where does it go?

• How much interaction is there with air / vacuum windows / remaining gas?

• Where can I stand when the experiment is running?

• Where can I stand when the experiment is not running?

• How much background do we get from neutrons / muons / …..?

• Why does RP not want me to make a target out of tungsten?

• Do I really have to wear a helmet in the experimental areas?

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FLUKA – the beginnings

• East Area Renovation

• Is the dump big enough?

• Do the magnets give a lot of shielding?

• Studies handed over (early 2018) to Robert and Elpida

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Damien Brethoux

What does a target really do?

• Use simulated data from FLUKA and Geant (thanks Marcel!!) to figure out the particles that come out of a beryllium target

• Check how FLUKA and Geant compare to Atherton studies

• But also, check production of neutral particles for KLEVER experiment

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AthertonKs production Λ0 production

Neutral beamline for KLEVER

• Neutral version of NA62

• Measure KLπ0 νν

• Fully neutral! Makes life difficult….

• Found many interesting things

• XCLD collimator too small

• Need 2xTCX extra to kill background

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TCX TCX

So many magnets…..

• Magnets form the heart of our simulations

• Require special routines to read and use magnetic field maps

• High-quality field maps are extremely important!!

• Many OPERA simulations performed by Philip Schwarz (TE-MSC-MNC)

• Without this work, none of my simulations would have worked (yes, really!)

• Measurements important but not enough: need field in yoke!

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QNR before QNR after QFS before QFS after

Putting field maps to work

• Real goal of using accurate field maps: track muons through magnet yokes, and see where they end up

• Enough muons to completely overload KLEVER detectors, so they need to go somewhere else

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• …but not NA62 control room

• And also not cause too much radiation outside of ECN3

Simulating NA62: K12 in FLUKA

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So what else did I learn?

• Already some examples shown of the things I worked on….

• But of course, there is more to life!

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You can make a T-Rex out of lego!

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Good food is the good life!

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Good food is the good life!

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And many, many other things

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So what’s next?

• Postdoc @ EPFL – for now 1 year

• But possibly up to 4 years

• LHCb group

• Design of new luminosity monitor

• And some more things!

• Not yet fully defined

• SND@LHC

• LHCb data analysis

• SciFi tracker

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A thank you to many people

• The EN-EA-LE section – you have been absolutely fabulous

• Lau, Niels, Johannes, Nikos, Alex, Adrian, Bastien, Marcel, Dipanwita, Eva, Moritz, Elisabetta, Gian Luigi,

• The East Area team

• Apologies for not attending all the meetings – but I still found it very very nice!

• A special thank you to Philip Schwarz

• Field maps were absolutely key to doing my job and the physics that came out!

• And finally, to all of EN-EA: THANK YOU! I had an amazing time!

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