3.9 KiB
SwissFEL Photon Screens: The Inside Scoop
👩🔬 User:
We need to measure the X-ray beam profile… what gadgets are we working with?
👨🏫 Diagnostics Ninja:
Ah, welcome to the Photon Screen Family—each one’s got a job and an attitude:
1️⃣ PSCR – The Nosy Traveler
👩🔬 User:
What’s a PSCR? Sounds like a covert spy cam.
👨🏫 Diagnostics Ninja:
Exactly! It moves with the screen like it’s following the X-ray beam on tour. You’ll find these mainly in Athos after mirrors, measuring beams at different deflection angles. It’s basically a beam paparazzi with a zoom lens.
👩🔬 User:
So, flexible but kinda nosy?
👨🏫 Diagnostics Ninja:
Yep! It’s like that friend who’s always at the perfect spot for group selfies—but sometimes forgets to check for photobombers (a.k.a. stray light coming down the beam tube).
2️⃣ PPRM – The Stationary Supervisor
👩🔬 User:
PPRM? Sounds serious.
👨🏫 Diagnostics Ninja:
Oh, it is. It’s locked in place, keeping its camera fixed while the screen moves into the beam. You’ll find these mainly at Aramis, holding down the fort like the team lead who never leaves their desk.
👩🔬 User:
Sounds pretty steady…
👨🏫 Diagnostics Ninja:
Very. Imaging the front face of a YAG crystal means it gets a clearer signal with minimal stray light coming down to beam pipe. No distractions, just X-rays.
3️⃣ PSCA – The Precision Diva
👩🔬 User:
And PSCA? Fancy name... what’s its deal?
👨🏫 Diagnostics Ninja:
Oh, PSCA is the perfectionist. It uses SmarAct motors for micron-level reproducibility. Its camera stays super fixed like it’s meditating. PSCA can image both the alignment laser and the X-ray beam, flexing its multi-tasking skills.
👩🔬 User:
So, like... the valedictorian of photon screens?
👨🏫 Diagnostics Ninja:
Yep—straight-A student who probably drinks herbal tea to “stay focused.”
Bonus: PSRD – The Underdog Detector
👩🔬 User:
Wait... PSRD? What’s that, a sidekick?
👨🏫 Diagnostics Ninja:
More like a specialist. It measures weak X-ray beams, like spontaneous radiation. It’s mainly used for undulator alignment and calibration, but recently, it’s been moonlighting as a low pulse energy detector for the PMOS spectrometer.
👩🔬 User:
Sounds like an underappreciated genius.
👨🏫 Diagnostics Ninja:
Totally. It’s like that quiet team member who shows up at just the right moment with the solution... when you thought they were asleep.
👩🔬 User:
Alright, so PSCR for flexibility, PPRM for stability, PSCA for precision, and PSRD for the underdog moments?
👨🏫 Diagnostics Ninja:
You got it! Welcome to SwissFEL—where even the screens think they're too good for the rest of us.
✅ Do Say:
"I’m using PSCR after the mirrors at Athos to measure different deflection angles."
❌ Don’t Say:
"PSCR is basically a periscope with trust issues."
✅ Do Say:
"PPRM works well for stable, fixed-position beam profiling at Aramis."
❌ Don’t Say:
"PPRM never moves… just like my motivation after lunch."
✅ Do Say:
"PSCA ensures precise, reproducible measurements with micron accuracy."
❌ Don’t Say:
"PSCA is like that overachiever who can’t chill."
✅ Do Say:
"PSRD is ideal for weak X-ray detection and undulator calibration."
❌ Don’t Say:
"PSRD: The X-ray beam’s emotional support detector."