Observation of reflected waves on the SABRE positive polarity inductive adder MITL
We are studying the coupling of extraction applied-B ion diodes to Magnetically Insulated Transmission Line (MITLs) on the SABRE (Sandia Accelerator and Beam Research Experiment, 6 MV, 300 kA) positive polarity inductive voltage adder. Our goal is to determine conditions under which efficient coupling occurs. The best total power efficiency for an ideal ion diode load (i.e., without parasitic losses) is obtained by maximizing the product of cathode current and gap voltage. MITLs require that the load impedance be undermatched to the self-limited line operating impedance for efficient transfer of power to ion diodes, independent of transit time isolation, and even in the case of multiple cathode system with significant vacuum electron flow. We observe that this undermatched condition results in a reflected wave which decreases the line voltage and gap electron sheath current, and increases the anode and cathode current in a time-dependent way. The MITL diode coupling is determined by the flow impedance at the adder exit. We also show that the flow impedance increases along the extension MITL on SABRE. Experimental measurements of current and peak voltage are compared to analytical models and TWOQUICK 2.5-D PIC code simulations.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 10180498
- Report Number(s):
- SAND-92-2812C; CONF-930616-30; ON: DE93019413; TRN: 93:020022
- Resource Relation:
- Conference: 9. IEEE pulsed power conference,Albuquerque, NM (United States),21-23 Jun 1993; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
INDUCTION GENERATORS
COUPLING
THERMIONIC DIODES
INDUCTION
COMPUTERIZED SIMULATION
T CODES
ACCELERATORS
ION SOURCES
ION BEAMS
MAGNETIC INSULATION
BEAM CURRENTS
ANODES
CATHODES
BEAM EXTRACTION
430302
700411
INJECTION AND EXTRACTION SYSTEMS
INERTIAL CONFINEMENT DEVICES