106 lines
3.9 KiB
Markdown
106 lines
3.9 KiB
Markdown
# **SwissFEL Photon Screens: The Inside Scoop**
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**👩🔬 User:**
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We need to measure the X-ray beam profile… what gadgets are we working with?
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**👨🏫 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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### **1️⃣ PSCR – The Nosy Traveler**
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**👩🔬 User:**
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What’s a PSCR? Sounds like a covert spy cam.
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**👨🏫 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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**👩🔬 User:**
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So, flexible but kinda nosy?
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**👨🏫 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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### **2️⃣ PPRM – The Stationary Supervisor**
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**👩🔬 User:**
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PPRM? Sounds serious.
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**👨🏫 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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**👩🔬 User:**
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Sounds pretty steady…
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**👨🏫 Diagnostics Ninja:**
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Very. Imaging the **front face of a YAG crystal** means it gets a **clearer signal** with minimal background interference. No distractions, just X-rays.
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---
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### **3️⃣ PSCA – The Precision Diva**
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**👩🔬 User:**
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And PSCA? Fancy name... what’s its deal?
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**👨🏫 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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**👩🔬 User:**
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So, like... the valedictorian of photon screens?
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**👨🏫 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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**👩🔬 User:**
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Wait... PSRD? What’s that, a sidekick?
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**👨🏫 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-energy detector for the **PMOS spectrometer.**
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**👩🔬 User:**
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Sounds like an underappreciated genius.
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**👨🏫 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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**👩🔬 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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**👨🏫 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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**✅ Do Say:**
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*"I’m using PSCR after the mirrors at Athos to measure different deflection angles."*
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**❌ Don’t Say:**
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*"PSCR is basically a periscope with trust issues."*
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**✅ Do Say:**
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*"PPRM works well for stable, fixed-position beam profiling at Aramis."*
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**❌ Don’t Say:**
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*"PPRM never moves… just like my motivation after lunch."*
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**✅ Do Say:**
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*"PSCA ensures precise, reproducible measurements with micron accuracy."*
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**❌ Don’t Say:**
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*"PSCA is like that overachiever who can’t chill."*
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**✅ Do Say:**
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*"PSRD is ideal for weak X-ray detection and undulator calibration."*
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**❌ Don’t Say:**
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*"PSRD: The X-ray beam’s emotional support detector."*
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