velocity filter: used to fire charged particles at exact speeds
DESCRIPTION
Velocity Filter: used to fire charged particles at exact speeds. Oak Ridge National Lab. What is this?. MagLev. Circulating Charges. Find the radius of curvature of the path of an electron fired at 10,000 m/s at right angles into a 5 Tesla field. - PowerPoint PPT PresentationTRANSCRIPT
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Velocity Filter: used
to fire charged
particles at exact
speedsOak Ridge National Lab
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What is this?
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MagLev
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Circulating Charges
Find the radius of curvature of the path of an electron fired at 10,000 m/s at right angles into a 5 Tesla field.
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Particle accelerators: use E and B fields to accelerate particles to high KEs, often
measured in eVsThe Cyclotron
“dee”
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Rutgers, NJ
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The Linac
The linear accelerator or Linac was the first new idea for accelerating particles in a straight line without the need for massive voltage supplies. The theory was that the linac could accelerate a particle using a lower voltage repeatedly.
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Fermilab * U. Chicago * 4 mile tunnel
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CERN (European Laboratory for Particle Physics) is an international laboratory where the W and Z bosons were discovered. CERN is the birthplace of the World-Wide Web. The Large Hadron Collider (see below) will search for Higgs bosons and other new fundamental particles and forces.
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Particle Detector at
CERN
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SSC1980s: never
finished
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Period and Frequency of Circulating Charges
Find the period of an electron trapped in a 5 Tesla magnetic field.
From previous analysis:
F = qvB = mv2/r
r = mv/qB
T = 2 r / v since v = d / t
T = 2 (mv/qB ) / v = 2 m/qB
T = 2 1.67 x 10–31 / 1.6 x 10–19 C * 5 T
T =1.3 x 10 –12 sec
F=1/T
= 7.6 x10 –11 circles/sec
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Mass Spectrograph:from the radius of the circle made you can identify the particle .
If r = mv/qB then q/m = v/Br