• T. Sakai, M. Inagaki, T. Kuwada, I. Sato
  Nihon University, Advanced Research Institute for the Sciences and Humanities, Funabashi
• K. Hayakawa, Y. Hayakawa, K. Nakao, K. Nogami, Y. Takahashi, T. Tanaka
  LEBRA, Funabashi

The 125 MeV linac at Laboratory for Electron Beam Research and Application (LEBRA) in Nihon University has been used for generation of the near-infrared FEL and the Parametric X-ray Radiation (PXR). Currently the FELs from 0.86 to 6 microns and the PXR X-rays from 5 to 20 keV are available at LEBRA. Precise experiments using the light sources require a high stability in both the wavelength and the intensity of the lights. Though the linac was operated with the cooling water stabilized at 30 plus or minus 0.2 deg C, periodical fluctuation of the electron beam energy and the beam orbit suggested that the stability of the cooling water temperature was not sufficient. With this condition a large fluctuation (plus or minus 15%) was observed for the PXR intensity. After the improvement of the fine cooling water system and the water flow path, fluctuation of the cooling water temperature at the supply head of the accelerating tubes and the electromagnets was suppressed to within plus or minus 0.01 deg C. As a result of the improvement the PXR intensity fluctuation at the X-ray output port has been suppressed to within plus or minus 2% for the operation over several hours.

• J.F. Patrick, S.L. Lackey
  Fermilab, Batavia

Funding: *Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
Fermilab* is constructing superconducting rf test facilities for development of technologies to be used in future Linac projects. Two of these facilities, the High Intensity Neutrino Source and the New Muon Laboratory, are proto-type Linacs which will run with beam. The requirements for these facilities vary but all involve collaboration and flexibility for integrating various new instruments. Tight timing requirements and automation are also required. Some facilities require integration into the existing Fermilab Control system. The controls also must be robust so as not to interfere with the main purpose of the facilities. We will outline the plan for accomplishing this task as well as the current status.

• R.D. Archuleta, L. Sanchez
  LANL, Los Alamos, New Mexico

Funding: This work supported by the US National Nuclear Security Agency and the US Department of Energy under contract DE-AC52-06NA25396
The Dual Axis Radiographic Hydrodynamic Test Facility (DARHT) at Los Alamos National Laboratory is the world's most advanced weapons test facility. DARHT contains two linear accelerators for producing flash radiographs of hydrodynamic experiments. High-speed electronics and optical instrumentation are used for triggering the accelerators and collecting accelerator data. Efficient and effective diagnostics provide basic information needed to routinely tune the accelerators for peak radiographic performance, and to successfully monitor the accelerators performance. DARHT's server and network infrastructure is a key element in providing shot related data storage and retrieval for successfully executing radiographic experiments. This paper will outline the elaborate Data Acquisition, Archival, Analysis, and Instrument Control System (DAAAC), as well as the server and network infrastructure for both accelerators.

LA-UR-08-03265

• E.B. Jacquez
  LANL, Los Alamos, New Mexico

Funding: This work supported by the US National Nuclear Security Agency and the US Department of Energy under contract DE-AC52-06NA25396
The mission of the Dual Axis Radiograph Hydrodynamic Test (DARHT) Facility is to conduct experiments on dynamic events of extremely dense materials. The PSS control system is designed specifically to prevent personnel from becoming exposed to radiation and explosive hazards during machine operations and/or the firing site operation. This paper will outline the Radiation Safety System (RSS) and the High Explosive Safety System (HESS) which are computer-controlled sets of positive interlocks, warning devices, and other exclusion mechanisms that together form the PSS.