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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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