Position A Position B (ne)Position B A I MV linear transformer driver (LTD) is being tested Diode with a large area e-beam diode load at Sandia National Laboratories (SNL). The experiments will be utilized to determine the repeatability of the output pulse and the reliability of the components. The 1 MV accelerator is being used to determine the feasibility of designing a 6 MV LTD for radiography experiments. The peak voltage, risetime, and pulse width as well as the cavity / timing jitter are analyzed to determine the repeatability of the output pulse.
I. CYGNUS DESIGN AND LAYOUTThe subcritical experiment (SCE) program was initiatedIn response to the programmatic need for fielding a after the 1992 moratorium on underground nuclear testing radiographic diagnostic on SCEs, a multiorganizational in support of stockpile stewardship [1]. The dynamic team was formed to develop a prototype x-ray machine. material properties of plutonium are a major topic of The major organizations involved are: Los Alamos exploration for the SCE program. In order to provide for a National Laboratory (LANL), Bechtel Nevada (BN), multilayered containment of plutonium, the SCEs are Sandia National Laboratories (SNL), and Titan/Pulse executed in the Ula underground tunnel complex at the Sciences Division (Titan/PSD). The source design is Nevada Test Site (NTS). Cygnus is a new radiographic x-based on the following three criteria: (1) it must fulfill the ray source developed for diagnostic support of the SCE radiographic source requirements as previously stated, (2) Program at NTS.it must accommodate the Ula tunnel environment in Typically, SCEs have been limited to surface terms of footprint, operations, and safety, and (3) it must diagnostics [2]. Cygnus radiography was developed to be reliable. The key to satisfying the first criterion is use complement the existing surface diagnostics, provide a of the rod pinch diode [3] which is a low-impedance, more extensive spatial view (albeit temporally limited), high-dose diode. This approach generally yields a smaller and provide internal (penetrating) measurements. The source size in comparison with other diode types. The Stallion series of SCEs consists of the following four footprint component of the second criterion was met by shots listed in chronological order: Vito, Rocco, Mario, using a modular pulsed power design where the energy and Armando. Armando was the initial experiment for storage unit is independently located with respect to the Cygnus radiography. The Rocco, Mario, and Armando accelerating cells, and where the two are connected by a tests use identical physics packages, permitting the configurable transmission line. The reliability criterion correlation of Amnwas achieved by using proven pulsed power elements, correlaton of Armando radiographic results with surface extraordinarily conservative mechanical and pulsed power results from all three shots. The main x-ray source designs, and (most importantly) an extensive test requirements for an SCE involve spot size, intensity, program. penetration, and duration. To this end Cygnus wasThe overall Cygnus layout, which shows the two designed to satisfy the following specifications:~1 mm sources as fielded at NTS/Ula, is shown in Figure 1. The source diameter, 4 Rads dose at a distance of 1 meter, major elements of Cygnus are: Marx generator, pulse -2.25 MeV endpoint energy, and < 100 ns pulse length.forming line, water transmission line, inductive voltage Two Cygnus sources (Cygnus 1, Cygnus 2) were adder (IVA), and rod pinch diode. A high voltage trigger fielded at NTS providing ...
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