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stephenbrooks org stephenbrooks org technical reports and papers from my work message boards muon1 project forum software here general rubbish discuss things miscellaneous black hole images obtained by raytracing photons through curved space something i did during my relativity course at oxford distributed particle accelerator design now dormant search site your browser does not support the iframe tag click here to get to the images page or get a better browser browser wars connect 4 competition using your browser colunms blockular challenge tubetris cylindrical tetrominoes ncgi website a half written asteroids game particle beam focussing game bmp3jpg file raptor penguin ppml 2 0 parser screen edge snapper 2026 oct 19 21 20 41 sample return mission to phobos launched today space mars jaxa https en wikipedia org wiki martian_moons_exploration 2026 oct 18 21 45 26 seems starship flight 15 is planned for a catch of both booster and ship flight 16 planned from florida spacex https www nasaspaceflight com 2026 10 spacex flight 15 16 milestones 2026 oct 18 18 13 23 interesting video about spaceship visual designs in the new dune https www youtube com watch v xp5k0bhmhqc 2026 oct 17 00 50 39 white dwarf stars can have colours from atmospheric impurities including green astronomy space https www skyatnightmagazine com news green star white dwarf discovery 2026 oct 16 01 09 05 new tesla roadster can drive on the ceiling and fly a certain distance rt https x com i broadcasts 1ykapwnggraxb 2026 oct 16 00 49 25 dialled in the correct frequency manually laser physics 2026 oct 14 23 28 46 construction progress on the extra large telescope astronomy space https www eso org public announcements ann26009 2026 oct 14 01 38 25 spacex are standing the recovered starship vertically now although i m not sure why it needs to vertical rt https x com spacex status 2110126570233094527 2026 oct 13 22 56 02 mars driving distance record goes to perseverance as it beats opportunity space nasa https x com nasamars status 2109759113941152026 2026 oct 12 19 57 49 connected the 397nm laser to the wavemeter for the first time and got my first open loop frequency stability measurements doesn t look bad the drift is slow so that noise might be reduced with more averaging the linewidth for ca ion doppler cooling is 23mhz so it s in the right order of magnitude already ignore the five stacked attenuators physics accelerators 2026 oct 10 22 24 58 2026 oct 10 22 24 25 saw a small rainbow sun dog at sunset today 2026 oct 10 18 40 28 flowing liquid on pluto space astronomy https www swri org newsroom press releases swri study finds evidence of liquid recently flowing pluto s surface 2026 oct 10 18 12 29 update thread about status of solar power markets rt https mastodon green solar_chase 117416568647418719 2026 oct 09 23 14 27 i got about 20mw coupled from both lasers including the 397nm one whose fibre core is only 2 4 microns wide by hand using allen keys only to discover the wave meter i use has a 0 5mw input power maximum 2026 oct 08 20 35 52 coupling power from this 866nm laser into a single mode fibre took some aligning but i got 1 3 of it in 23mw of about 70mw total it helped when i installed the lenses and fibres for the correct wavelength range it also helped when i hadn t bolted the coupler to the wrong set of holes and lost most of the beam physics 2026 oct 07 22 43 56 the starship returned spacex waterfowl https www youtube com watch v qsiouket8p0 2026 oct 05 18 51 44 niobium found in planet orbiting white dwarf thought to be second generation planet formed from the red giant phase remains space astronomy astrophysics https science nasa gov missions hubble suspected second generation planet solves nasa hubble cold case 2026 oct 05 18 50 36 saw some large mushrooms at the laboratory on sep 25 but forgot to post them 2026 oct 04 18 47 20 and now for our hyper local forecast it s raining here 2026 oct 02 19 35 41 turns out my pixel shader can be extended to simulating something more like a real accelerator cell with nonlinearities this the dynamic aperture of a fodo cell with a sextupole defect in the f magnet while i change the f magnet strength top left is real space xy then x y bottom left is xx phase space bottom right is yy you can click and drag to change the f and d magnet strengths yourself at https shadertoy com view fxg3wh may require a strong graphics card physics accelerators nonlineardynamics 2026 oct 01 00 28 18 on venus wouldn t a helium balloon generate a lot more lift because of the higher density of the atmosphere 2026 sep 30 23 10 03 it s mars year 39 space astronomy https x com nasamars status 2105431612905369814 2026 sep 30 20 23 48 historical water storage structures are being brought back into use in india https www bbc com future article 20260820 india is turning to ancient water systems as modern ones run dry 2026 sep 30 00 40 02 there were four big deer in my garden when i came home one even in the front garden almost getting in the way of the door 2026 sep 28 23 31 19 starship deploying starlink satellites on its latest mission video spacex https x com starlink status 2104603601943339071 also there s a whole new episode about the making of starship https www spacex com content starship holy grail of rocketry 2026 sep 28 18 16 58 just powered on the 397nm and 866nm tunable diode lasers for doppler cooling next a wavemeter will be added as a feedback loop to try and stabilise the frequencies eventually they will be fired through the ion trap to cool ca ions to milli kelvin temperatures physics accelerators 2026 sep 27 19 06 53 i guess it is really greenish https en wikipedia org wiki greenish_warbler 2026 sep 27 17 30 57 despite worrying noises last night the nor easter mostly took down a lot of leaves and twigs here no damage i went out just now to collect the medium sized branches and make it look less like a disaster area weather main thing was i cut away some vines that fell down from a tree and were getting in the way 2026 sep 27 00 27 29 a 100 foot wide 30 meter 28 million pound 12 8 million kilogram boulder was found to have moved 460 feet 140 meters on comet 67p churyumov gerasimenko in the lead up to perihelion in august 2015 space https images nasa gov details pia21565 2026 sep 26 23 09 15 this is where starship ship 40 currently is at sea spacex https www marinetraffic com en ais details ships shipid 255286 mmsi 249364000 imo 9592848 vessel forte 2026 sep 24 17 17 44 this shadertoy shows the stable region of a nonlinear periodic system analogous to some accelerators like the mandelbrot set black indicates stability and colours show how long unstable particles take to escape by dragging the mouse horizontally you can change the phase advance before each nonlinear kick and observe patterns of 6 5 4 3 islands appearing when this advance is near 1 6 1 5 1 4 1 3 physics accelerators dynamics https www shadertoy com view 7xvgdz 2026 sep 20 19 29 10 boring company 200mph tunnel loop planned rt https x com boringcompany status 2101743162838647183 2026 sep 20 18 21 41 ok redid my surface laptop with a 6gb swap partition and hibernate works now also disabled secure boot and the startup is funny now microsoft logo big red opened padlock grub bootloader debian 2026 sep 20 05 45 10 the windows surface laptop yes the one microsoft made will not upgrade from win10 to 11 because they didn t put enough ssd in it 64gb google tells me debian 13 will happily go on there and there s even a kernel package to get the surface touchscreen etc working again later well debian 13 is on the windows surface laptop and even the touchscreen works but it seems i need to redo it with a swap partition larger than my ram if i want to hibernate my duck s head shaped usb install media died though another 15 year old usb stick i had lying around worked though i need to buy more i thought i had loads of these 2026 sep 19 22 15 02 put thread locker red on my lawnmower s wonky wheel nut 3 hours ago i m pleased to announce my lawnmower wheel is constrained in 5 degrees of freedom that s 6 dof minus the one it needs to rotate 2026 sep 19 19 53 41 new lunar crater 200m across space moon astronomy https www skyatnightmagazine com news mcgetchin crater moon lro discovery 2026 sep 18 19 19 01 lasers moved my office is tidier now 2026 sep 18 02 04 05 first new cat species discovered in 100 years https www nationalgeographic com animals article meet the first new cat species discovered in 100 years 2026 sep 17 20 45 22 my boarding pass will be the first thing in downloads right 2026 sep 17 19 43 23 went on a tour of the rf facility at jefferson lab and noticed this drift tube structure at 1497mhz the drift tube bore is smaller than a finger unlike the larger 201mhz dtl tanks i ve seen accelerators physics rf 2026 sep 17 04 06 17 found a little frog on a bollard 2026 sep 13 21 31 14 in any case i got my apache ssl certbot let s encrypt php or whatever stack running on my home computer 2026 sep 13 21 27 30 well nothing s perfect this one lacks an ability to re order virtual desktops and it consistently lacks it in all three places you d expect to find it apparently this is coming soon in debian 14 2026 sep 13 20 32 59 alright so i want kate to open files as new tabs but i have several windows open with different sets of tabs and it always chooses the one that s on a different screen on a different desktop and forcibly switches to it i wish it had a setting to open a tab in the nearest window by some measure kde 2026 sep 13 19 59 28 having used the crappy windows 11 virtual desktops at work i ve activated them on kde plasma now and ooh this is good worth learning the basic keyboard shortcuts for moving windows and switching desktops linux 2026 sep 13 19 35 12 now it s getting brighter and i heard a cockerel crowing 2026 sep 13 16 35 02 such a big raincloud it feels like it s night time here very gloomy 2026 sep 13 00 32 39 low tide was in the evening this time 2026 sep 12 21 01 48 don t know why but the grass growth has decelerated so i don t need to mow the lawn this weekend 2026 sep 12 21 01 40 drone going inside a gasometer video rt https x com atomsnotbits status 2098875923391267151 2026 sep 11 22 53 56 some octupoles physics accelerators magnets photos rt https x com muota_here status 2098296639614243321 2026 sep 10 19 17 55 had to summarise all our research in only one poster so i split it in two makes for a busy poster physics accelerators https stephenbrooks org ap report 2026 11 brooks_ldrd2026_poster pdf 2026 sep 07 17 53 40 fly by photos of one of earth s quasi moons but it s rather small 20m space astronomy asteroid https www skyatnightmagazine com news asteroid 2016 ho3 kamooalewa tianwen 2 utm_source flipboard utm_medium activitypub 2026 sep 07 01 41 18 apparently i can use kwin rules to force a fullscreen opengl program to act as a desktop background might be interesting to try 2026 sep 06 20 13 05 https www theregister com public sector 2026 09 06 us troops can still be tracked by purchased location data and congress wants to know why 5294652 2026 sep 05 22 43 48 and now this game works on linux too https stephenbrooks org games tubetris 2026 sep 05 21 53 11 four more of my old website programs ported to linux https stephenbrooks org archive condensation https stephenbrooks org archive lights https stephenbrooks org archive galaxies https stephenbrooks org archive glowsurface 2026 sep 05 20 48 25 isar aerospace gets to orbit first orbital launch from continental europe video rt https x com atomsnotbits status 2096335505298444377 2026 sep 03 19 36 07 apparently this subtly different thing is also a solution of maxwell s equations and it doesn t have the dez dx bit integrating to zero along z a bit puzzled if this breaks any practical rule 2026 sep 03 14 44 50 here s another rf mode a skew vertical tm mode in a smaller cavity really i just reduced the length of the field region relative the length of the soft edge or fringe regions the idea was to get an ez field that varies linearly in the transverse x direction this field does this but if a particle passes through along z in the low frequency limit the ez contribution integrates to zero so in reality the deflections of particles have to be evaluated taking that integral which pushes me to higher frequencies relative to the transit time of the particle accelerators physics 2026 sep 02 22 43 17 an organisation is not a person a person s actions have motivation behind them but an organisation can emphatically do two contradictory things at once 2026 sep 02 22 42 24 sometimes in life it s good to give yourself an arbitrary challenge in fact that s all life is come to think of it 2026 sep 02 00 41 02 floating island https www bbc com news articles cgk5jk6nkxzo 2026 sep 01 22 17 27 https www bbc com news articles cj9lxkyydk8o 2026 sep 01 20 18 55 here s the calculation for the rf field model derived from behaviour near the axis the rf multipole case got quite complicated maybe there s a simpler way but i wanted to see if this method which i d used for magnetostatics magnet field models could be generalised https stephenbrooks org ap report 2026 9 rffield pdf physics electromagnetism accelerators 2026 sep 01 16 06 08 the electric blue and magnetic orange fields in an analytic model of an rf dipole deflector i wanted a series solution that i could use in particle tracking calculations taking a function f z that s the intensity of the field on axis and then working out the rest using maxwell s equations and the desired frequency and symmetry it took a while to derive and debug but it does appear to satisfy maxwell s time dependent equations now physics accelerators newest 202608 202607 202606 202605 202604 202603 202602 202601 202512 202511 202510 202509 202508 202507 202506 202505 202504 202503 202502 202501 duckbendy duckbendy duckbendy duckbendy duckbendy duckbendy duckbendy duckbendy duckbendy duckbendy duckbendy duckbendy duckbendy duckbendy duckbendy duckbendy duckbendy duckbendy duckbendy e mail sb stephenbrooks org xopf stephenjbrooks mastodon sjb mstdn io