Its sad to hear of his passing. I met Roger first when he led the EMMA FFA project, built and successfully demonstrated at Daresbury lab. He was keen to promote accelerator physics projects in various applications such as cancer treatment, nuclear waste transmutation, particle physics etc

XA2010, by Banjo or Freakout 10 track album

Looking for alternative Christmas music? XA2010 by Banjo or Freakout hits the spot banjoorfreakout.bandcamp.com/album/xa2010

Moonbeaaningly on Instagram: "GREEN FLAVOUR 🌿🍵 This is my entry for @yeoseurope ‘s contest!! It’s a digitally hand-drawn animation (9 frames per second) which took me about 40 hours to create, so I r... 110 likes, 16 comments - moonbeaaningly on November 19, 2025: "GREEN FLAVOUR 🌿🍵 This is my entry for @yeoseurope ‘s contest!! It’s a digitally hand-drawn animation (9 frames per second) which took me...

Amazing work by my 12 year old! Her hand drawn animation is an entry to Yeos creative fund competition. Please click through to instagram to like

A clock whos hands and dials cover vast timescales from seconds to epochs stephenbrooks.org/misc/clock.h...

Good to be back at @imperialcollegeldn.bsky.social for the FFA'25 workshop

Day 2 at the IOP PAB conference taking place in Oxford today

#ipac25

Xeuying Lu explained how reducing the RF pulse duration, tau, helps get around the breakdown limit - empirically the limit scales with tau to the power of 5

Proton and heavy ion beam power over time presented by Kanemura-san of FRIB #ipac25

SY Lee showed these nice experimental measurement of Lissajous curves #ipac25

Papers submitted! #ipac25

For accelerator physicists everywhere it's IPAC submission deadline day! #ipac25

Nice explanation! I happen to use a CRT electron gun in a accelerator physics experiment.

Minor point - I think the steering was done with electrostatic fields not magnets

For accelerator physicists the black line depicts the microwave instability threshold in the complex normalised impedance plane in the case of a Gaussian momentum distribution. For plasma physicists - this is just another way of looking at the plasma dispersion function!

Nice to see some Lie operators!

This is much worse than the quoted exchange conveys. Particularly Trump's response to Mills, "we are the federal law." Just absolute tyranny shit.

Black holes, particle physics and dark matter: What is CERN, and why is Ireland applying to join? Ireland is set to apply for associate membership status of the major European scientific body today – but why has it taken so long?

Ireland is set to apply for associate membership status of major European scientific body CERN today – but what is CERN, and why has it taken so long for us to join?
jrnl.ie/6626235

So it turns out the integers in the array were declared as 16-bit using the function SELECTED_INT_KIND whereas when split in two steps it was converted into 32-bit

Ah...I think you cracked it. It's failing at 2^8. Thanks!

Fortan output

This is an example of how it occurs in the wild. (p,i,j) are the array indices

The good old ZX Spectrum with its rubber keyboard!

Applications open for the summer 2025 session of the US Particle Accelerator School:
uspas.fnal.gov/programs/202...

Just came upon a strange gfortran bug. ABS() which should return the absolute value somehow returned a negative value. It occurred when operating on a single array element
ABS(arr(i,j)).
The fix is to split steps
M = arr(i,j) followed by
ABS(M)

Anyone come across this?

This is another I found on my lunchtime walk

Harwell campus festures some eye-catching buildings at various stages of construction. This one looks fairly complete ...

His comments were unbelievably crass!

The alternative approach- stack several cycles on the outer radius of a fixed field accelerator. This increases the intensity for low rep rate target

Beams circulating in a ring before extraction to one of target stations (in reality the split happens later along a common extraction line)

Beam stacking experiment at a fixed field alternating gradient accelerator Beam stacking experiments in an FFA to reduce space charge effect.

Here's the link to the paper link.aps.org/doi/10.1103/...