105 lines
3.9 KiB
Markdown
105 lines
3.9 KiB
Markdown
# **SwissFEL Photon Screens: The Inside Scoop**
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**:woman_scientist: User:**\
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We need to measure the X-ray beam profile… what gadgets are we working with?
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**:man_teacher: Diagnostics Ninja:**\
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Ah, welcome to the **Photon Screen Family**—each one’s got a job and an attitude:
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---
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### **:one: PSCR – The Nosy Traveler**
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**:woman_scientist: User:**\
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What’s a PSCR? Sounds like a covert spy cam.
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**:man_teacher: Diagnostics Ninja:**\
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_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.
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**:woman_scientist: User:**\
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So, flexible but kinda nosy?
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**:man_teacher: Diagnostics Ninja:**\
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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).
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---
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### **:two: PPRM – The Stationary Supervisor**
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**:woman_scientist: User:**\
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PPRM? Sounds serious.
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**:man_teacher: Diagnostics Ninja:**\
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_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.
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**:woman_scientist: User:**\
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Sounds pretty steady…
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**:man_teacher: Diagnostics Ninja:**\
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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.
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---
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### **:three: PSCA – The Precision Diva**
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**:woman_scientist: User:**\
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And PSCA? Fancy name... what’s its deal?
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**:man_teacher: Diagnostics Ninja:**\
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_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.
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**:woman_scientist: User:**\
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So, like... the valedictorian of photon screens?
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**:man_teacher: Diagnostics Ninja:**\
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Yep—straight-A student who probably drinks herbal tea to “stay focused.”
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---
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### **Bonus: PSRD – The Underdog Detector**
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**:woman_scientist: User:**\
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Wait... PSRD? What’s that, a sidekick?
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**:man_teacher: Diagnostics Ninja:**\
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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.**
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**:woman_scientist: User:**\
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Sounds like an underappreciated genius.
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**:man_teacher: Diagnostics Ninja:**\
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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._
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---
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**:woman_scientist: User:**\
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Alright, so PSCR for flexibility, PPRM for stability, PSCA for precision, and PSRD for the underdog moments?
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**:man_teacher: Diagnostics Ninja:**\
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You got it! Welcome to SwissFEL—_where even the screens think they're too good for the rest of us._
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---
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**:white_check_mark: Do Say:**\
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_"I’m using PSCR after the mirrors at Athos to measure different deflection angles."_
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**:x: Don’t Say:**\
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_"PSCR is basically a periscope with trust issues."_
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**:white_check_mark: Do Say:**\
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_"PPRM works well for stable, fixed-position beam profiling at Aramis."_
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**:x: Don’t Say:**\
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_"PPRM never moves… just like my motivation after lunch."_
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**:white_check_mark: Do Say:**\
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_"PSCA ensures precise, reproducible measurements with micron accuracy."_
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**:x: Don’t Say:**\
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_"PSCA is like that overachiever who can’t chill."_
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**:white_check_mark: Do Say:**\
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_"PSRD is ideal for weak X-ray detection and undulator calibration."_
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**:x: Don’t Say:**\
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_"PSRD: The X-ray beam’s emotional support detector."_ |