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PFG/Diffusion Z Gradient Coils and Probes- Pulsed Field Gradient Coils up to 4,000 G/cm (40 T/m) Highest Efficiency, Ultra-Shielded, Fastest Switching |
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Parameter |
Model 16-38 |
Model 20-40 C |
Model 47-70 |
Units |
Outside diameter |
38 |
39 |
70 |
mm |
Diameter of rf shield |
16 |
20 |
50 |
mm |
Clear I.D. |
14 |
17.5 |
47 |
mm |
Cooling method |
Water |
Water |
Water |
- |
Continuous gradient (G/cm) |
380 |
180 |
75 |
G/cm |
Continuous gradient (T/m) |
3.8 |
1.8 |
0.75 |
T/m |
Pulse gradient |
3800 |
1100 |
480 |
G/cm |
Duty cycle |
1% |
2.5% |
2.5% |
|
Gradient gain, α |
480 |
180 |
30 |
mT/A/m |
Continuous current (water) |
8 |
10 |
25 |
A |
Peak current |
80 |
60 |
160 |
A |
di for 4% local deviation |
6 |
12 |
24 |
mm |
zi for 4% local deviation |
13 |
28 |
30 |
mm |
DC resistance, RE |
1.6 |
1.5 |
0.7 |
Ω |
Inductance, L |
130 |
200 |
170 |
μH |
Slew rate, αV / L , at 1 V |
3700 |
900 |
180 |
T/m/s |
Local deviation (or differential linearity) is defined as the rms deviation from the mean gradient over the specified diameter, di, and length, zi, of the cylindrical sample region. Eddy currents from the internal RF shield are negligible. The gradient slew rate GS is the instantaneous rate of change in gradient when a 1 V step is applied. The continuous current ratings are true continuous ratings for a single axis with no time limit and adequate cooling.
Polystyrene self-diffusion at 25°C Self-diffusion coefficients at 25°C in carbon tetrachloride for aqueous 45 KD polyethylene oxide (PEO) as a function of PEO concentration
Spectra by: Baltusis (Varian),
and Antalek, Chari, and Hewitt (Kodak).
Please contact sales with questions or quote requests.