Focusing System With Permanent Magnets for Klystrons
Applying permanent magnet technology to beam focusing in klystrons can reduce power consumption and increase reliability. These features benefit a variety of applications especially for large facilities that use a large number of klystrons such as the International Linear Collider. The low magnetic field needed for the purpose allows us to use inexpensive ferrite magnets instead of rare earth magnets. In order to evaluate the feasibility of such a focusing system with ferrite magnets, a test model for 750 kW L-band klystron was constructed. As a result of the power test, we attained 94% of the output power compared to an electromagnet.
Distributed RF Scheme (DRFS) - Newly Proposed HLRF Scheme for ILC
The Baseline Conceptual Design (BCD) of the superconducting ILC main linac (ML) assumes 2 tunnels and the reference design report (RDR) based on that. However due to the high cost of construction, a single tunnel proposal has been developed. Two supporting plans, the klystron cluster scheme (KCS) and the distributed RF scheme (DRFS) are under intensive study by the ILC global design effort (GDE). In this report, we present the details of the DRFS configuration. We also discuss the availability and a maintenance plan. Critical items and the demonstration plan for the DRFS are also described.
Klystrons for Accelerator Improvements
Higheenergy :.hysics demand for new accelerator systems and improvements has put considerable emphasis on increasing the operating efficiency of tubes used for accelerator power sources. The klystron hasplayedavery important role in most linear accelerators due to its capability to provide efficient and stable microwave power. Intrinsic propcrties of the klystron due to the separation of the various functibns (beam generation, rf input, interaction region, rf output, and beam collection) make it ideally suited to applications where high phase stability, low harmonic content and long life are desired. At the Stanford Linear Accelerator Center several accelerator improvement programs all requiring new klystron designs (RLA, SPEARFor significant efficiency improvements to the present designs are under way.