Document ID: chunk:federal_register_of_legislation:F2024L01024:front:0:p149
Version: federal_register_of_legislation:F2024L01024
Segment Type: other
Provision Reference: 
Character Range: 436086–438690

of characteristics:
1. a. Voltage rating greater than 1.4 kV;
 b. Energy storage greater than 10 J;
 c. Capacitance greater than 0.5 µF; and
 d. Series inductance less than 50 nH; or
2. a. Voltage rating greater than 750 V;
 b. Capacitance greater than 0.25 µF; and
 c. Series inductance less than 10 nH;
b. Superconducting solenoidal electromagnets having all of the following characteristics:
1. Capable of creating magnetic fields greater than 2 T;
2. A ratio of length to inner diameter greater than 2;
3. Inner diameter greater than 300 mm; and
4. Magnetic field uniform to better than 1% over the central 50% of the inner volume;
Note: 3A201.b. does not apply to magnets specially designed for and exported 'as parts of' medical nuclear magnetic resonance (NMR) imaging systems. The phrase 'as part of' does not necessarily mean physical part in the same shipment; separate shipments from different sources are allowed, provided the related export documents clearly specify that the shipments are dispatched 'as part of' the imaging systems.
3. A. 201. c. Flash X‑ray generators or pulsed electron accelerators having either of the following sets of characteristics:
1. a. An accelerator peak electron energy of 500 keV or greater but less than 25 MeV; and
 b. With a 'figure of merit' (K) of 0.25 or greater; or
2. a. An accelerator peak electron energy of 25 MeV or greater; and
 b. A 'peak power' greater than 50 MW.
Note: 3A201.c. does not apply to accelerators that are component parts of devices designed for purposes other than electron beam or X‑ray radiation (electron microscopy, for example) nor those designed for medical purposes:
Technical Notes:
1. The 'figure of merit' K is defined as:

 where:

 V is the peak electron energy in million electron volts.

 If the accelerator beam pulse duration is less than or equal to 1 µs, then Q is the total accelerated charge in Coulombs. If the accelerator beam pulse duration is greater than 1 µs, then Q is the maximum accelerated charge in 1 µs.

 Q equals the integral of i with respect to t, over the lesser of 1 µs or the time duration of the beam pulse (Q =  idt), where i is beam current in amperes and t is time in seconds.

2. 'Peak power' = (peak potential in volts) x (peak beam current in amperes).

3. In machines based on microwave accelerating cavities, the time duration of the beam pulse is the lesser of 1 µs or the duration of the bunched beam packet resulting from one microwave modulator pulse.

4. In machines based on microwave accelerating cavities, the peak beam current is the average current in the time duration