When I visited the European Spallation Source last week I was lucky enough to see some of the workings of the rotating segmented tungsten target, which will be hit by initially 3MW and eventually 5MW of proton beam. The target 'wheel' hangs from the shaft in the video, which you can see rotating to align a different one of 32 sectors with each 14Hz proton pulse, taking just over two seconds per rotation. #physics #accelerators
On the GANIL facility tour last Friday I saw a separated sector #cyclotron (too big for the frame but you can see one sector's magnet in green) and a beamline where they were trying to make super-heavy elements by colliding a mid-mass ion beam with heavy element target.
#accelerators #physics
I was at the European Spallation Source today giving a seminar on the CEBAF 22GeV recirculating linac upgrade with permanent magnets.
https://stephenbrooks.org/ap/report/2026-7/Brooks_ESSseminar_CEBAFupgrade.pptx
#physics #accelerators
Went on a tour of the GANIL ion cyclotron facility yesterday. Do you prefer the 1980s control panel for the cyclotrons or the 2010s one for the superconducting linac? #physics #accelerators
This afternoon in the #IPAC26 poster session I'm controlling six beams that behave differently in the same beam pipe, going through the same magnets. If this is possible it could save costs for the Jefferson Lab 22GeV energy upgrade.
https://stephenbrooks.org/ap/report/2026-5/CEBAF_matching_poster.pdf
I'll be in baguette area BC14, ask about anything you like. #IPAC2026 #physics #accelerators
My poster on simulating crystalline ion beams in the BNL Booster accelerator is in the "baguette" area this afternoon, although if you're not in France you can see it below!
https://stephenbrooks.org/ap/report/2026-6/crystalline_booster_poster.pdf
#accelerators #physics #IPAC26 #IPAC2026
Fermilab are presenting their plans at #IPAC26. #accelerators #physics
Tomorrow I show what happened when we put beam through these 1.85 Tesla permanent #magnets. #IPAC26 #accelerators #physics
9:50am in the big auditorium
"Beam tests of a permanent magnet medical accelerator arc from 10-250MeV" (WEO4M02)

There are a family of stable solutions for putting a crystalline beam in Brookhaven National Laboratory's Booster accelerator, because angular momentum about the vertical axis can be freely chosen within a range. The videos below show this for several different values, the top six of which stay at a low temperature (<20mK). Changing how fast the bunch spins actually changes its shape as shown in the vertical plots afterwards.

#physics #accelerators

The bunch rotates by 0.495 times for each turn, which is weird (normal beams are once per turn). But also if you jump two turns at a time, diffusion of particles between the quadrants is visible.
#accelerators #physics