11.22 Confinement of positive ions and electrons with a static electric and magnetic field

Sitemap    Some speed - temperature - voltage calculations

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Mean speed of D2 molecules at 293 K:

. m . v2  = 3/2 . k . T  (see: hyperphysics kinetic temperature )

k = Bolzmann constant = 1,38 E-23 J/K      ( k = R/Na,  R=8,31 Nm/mol, K    Na = 6,0 E23)
m = massa D2 molecule =  2. 2.  1,67E-27 = 6,68E-27 kg

v2 =  3/2 . 1,38 E-23 .293 / ( . 6,68E-27 )
v  = 1,35 . 103 m/s

 

v = 3. 104 m/s  of D+ ions.

m(D+ ion) = 2. 1,67. 10-27 kg = 3,34 . 10-27 kg

. m . v2  = 3/2 . k . T

-> T = . m . v2 / k = ⅓ . 3,34 . 10-27 . (3.104 )2 / (1,38 . 10-23)  = 7,26 . 104 K

. m . v2 = ΔV. q    (ΔV = voltage difference needed to accelerate the ions; q = charge of a ion = 1,6 . 10-19 C )

ΔV = . m . v2 / q = . 3,34 . 10-27 . ( 3. 104 )2 / (1,6 . 10-19 ) =  9,4 V

 

v = 3. 104 m/s  of electrons

m(electron) = 9,1. 10-31 kg

ΔV = . m . v2 / q = . 9,1. 10-31  . ( 3. 104 )2 / (1,6 . 10-19 ) = 0,0026 V

 

v = 3. 105 m/s  of D+ ions.

-> T = . m . v2 / k = ⅓ . 3,34 . 10-27 . (3.105 )2 / (1,38 . 10-23)  = 7,26 . 106 K

. m . v2 = ΔV. q 

ΔV = . m . v2 / q = . 3,34 . 10-27 . ( 3. 105 )2 / (1,6 . 10-19 ) =  900,4 V

 

v = 3. 105 m/s  of electrons

ΔV = . m . v2 / q = . 9,1. 10-31  . ( 3. 105 )2 / (1,6 . 10-19 )  = 0,26 V

 

v = 3. 106 m/s  of D+ ions.

-> T = . m . v2 / k = ⅓ . 3,34 . 10-27 . (3.106 )2 / (1,38 . 10-23)  = 7,26 . 108 K

. m . v2 = ΔV. q 

ΔV = . m . v2 / q = . 3,34 . 10-27 . ( 3. 106 )2 / (1,6 . 10-19 ) =  90kV

 

v = 3. 106 m/s  of electrons

ΔV = . m . v2 / q = . 9,1. 10-31  . ( 3. 106 )2 / (1,6 . 10-19 )  = 26 V

 

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