BBU design of linear induction accelerator cells for radiography application

Shang, C. C.; Chen, Y.-J.; Caporaso, G.J.; Houck, T.; Molau, N.E.; Nelson, Scott D.; Ng, Wei-Ren; Fockler, J.

doi:10.1109/pac.1997.751298

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…The exact scaling of Z ⊥ with g has implications for the design of a new LIA, because it provides the link between high-voltage engineering constraints and BBU growth. As a practical example, Table I compares these expressions for Z ⊥ with measured values for the DARHT accelerators [14,15,16,17,18,19,20,8]. It is seen that neither of the above expressions for Z ⊥ agrees very well with the measured DARHT-I impedance.…”

Section: Theorymentioning

confidence: 93%

Scaling of induction-cell transverse impedance: effect on accelerator design

Ekdahl¹

2016

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Section: Theorymentioning

confidence: 93%

Scaling of induction-cell transverse impedance: effect on accelerator design

Ekdahl¹

2016

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“…Previous papers (e.g. [1]) have discussed these issues in the context of radiographic machines such as FXR and DARHT giving specific examples of gap and ferrite damper geometry. An accompanying paper [2] AMOS code [3] calculations for the current design for the DARHT-2 "standard" 10-inch diameter cells, which comprise the last 80 of the total 88 accelerator cells, show quite low values for both the impedance and Q 2 for the most important dipole modes.…”

Section: Introductionmentioning

confidence: 99%

Beam breakup calculations for the second axis of DARHT

Fawley

Chen²,

Houck³

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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The accelerator for the second axis of the Dual Axis Radiographic Hydrodynamic Test (DARHT) facility will produce a 4-kA, 20-MeV, 2-s output electron beam with a design goal of less than 1000 mm-mrad normalized transverse emittance and less than 0.5-mm beam centroid motion. In order to meet this goal, the beam transport must have excellent optics and the beam breakup instability (BBU) must be limited in growth. Using a number of simulation codes such as AMOS and BREAKUP, we have modeled the transverse impedances of the DARHT-II accelerator cells and the electron beam response to different transverse excitations such as injector RF noise, magnetic dipole fields arising from the 90-degree bend between the cathode stalk and insulator column, and downstream solenoid alignment errors. The very low Q (2) predicted for the most important TM dipole modes has prompted us to extend the BREAKUP code to be able to use the dipole wakefields calculated by AMOS in addition to the most usual discrete frequency BBU mode model. We present results for the predicted BBU growth and the empirical sensitivity to various machine parameters.

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