Velocity Filter: used

to fire charged

particles at exact

speedsOak 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.

Particle accelerators: use E and B fields to accelerate particles to high KEs, often

measured in eVsThe Cyclotron

“dee”

Rutgers, NJ

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.

Fermilab * U. Chicago * 4 mile tunnel

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.

Particle Detector at

CERN

SSC1980s: never

finished

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

Mass Spectrograph:from the radius of the circle made you can identify the particle .

If r = mv/qB then q/m = v/Br