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NPL

Nuclear Physics Lab

NPL
Quarter Crushing

Quarter Crushing

Authors: Brian, Fred, Jimbo, & Tim

A display of a sweep in discharged energy in increments of 5kJ
A quarter shrunken smaller than a dime.
The original “throwing of the switch.”
The cap bank – total of six caps in parallel.
Before the pulse.
After the pulse.
Work coils, fresh quarters, and products.
Production mode: work coils.

Lots of people have played with quarter shrinking and can crushing recreationally.  The underlying physics is usually explained in conceptual and theoretical terms, but not often in great detail.  The real-world application for this technology is called “magneforming” and finds use in radial crimping most often, but occasionally as an alternative to stamping and complicated forming operations.  As an example, the drift tubes in the Atlas detector at the LHC were all sealed via magneforming.  The pressures achievable are quite high, and not too hard to calculate.  For those interested, here is a detailed writeup, including a small discussion on optimization.  Link below. 

Pulsed Magnet Crimping and Quarter Crushing

Back
  • NPL-Home
    • About Us
    • Accelerators
      • Betatrons
        • Plasma Betatron Coil Form: Design and Construction
        • Pulsed B-Dot Measurement
        • CW B-Dot Measurement
        • First Beam Attempts
      • Cyclotrons
        • 12-Inch Cyclotron
        • Axial Betatron Motion
        • Floating Wire Technique
        • 12-Inch Cyclotron Papers
      • DC Potential Drop
    • Experiments
      • Alpha Spark Detector
      • Jay’s Diffusion Cloud Chamber
      • Tim’s Wilson Cloud Chamber
      • Deuterated Target Preparation
      • Gamma-Gamma Coincidence
      • Measurement of excited Np237 half-life via the alpha-gamma coincidence method.
      • MUONS
        • Life & Times of a Muon
      • Neutrons
        • Neutron Diffusion Time Measurement
        • Neutron Induced Gamma Rays
        • Neutron Detection with He-3
      • Photography
        • AVCO Rotating Mirror
        • Dark Room
        • Fast Flash Photography
        • Rotating Drum Camera
        • Schlieren Photography
        • X-Rayted Photos
      • Rutherford Scattering
      • Thermoluminescence
    • History
      • The Kerst Collection
      • Heisenberg Cube
      • Koeth Collection – Consumer Products
      • Koeth Collection – Radiation Detection Instruments
      • Koeth Collection – Reactors & Weapons
      • Koeth Collection – Games & Collectables
    • High Voltage & Pulsed Power
      • Blue Thunder
      • Jacob’s Ladder
      • Krytrons
      • Marx Generator
      • Electric Watermelon
      • Tesla Coils
        • Jay’s Tesla Coil
        • Variacs
      • Quarter Crushing
    • Plasma
      • Fusors
        • FUSOR I
        • FUSOR II
        • Scott's Fusor
        • Fusor Simulations
      • The Mirror Machine
      • Pinch Machines
        • Linear Pinch
        • Toroidal Pinch
        • Pinching
    • Spectroscopy
      • Alpha Particle Spectroscopy
      • Gamma Ray Spectroscopy
        • HPGe Gamma Ray Spectroscopy Education
        • HPGe Systems
        • Cosmogenic Be-7
        • NAS Wildwood Mystery
        • Autunite
        • Trinitite
        • Tc-99m : Cardiac Stress Test
      • Software & Hardware
        • Refurbishment of LN2 Dewars
        • DIY Matlab MCA
        • Amateur Canberra Spectroscopy System
        • Antique MCA
        • NIM Modules
          • Canberra Nim Modules
          • ORTEC Nim Devices

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