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MOP111 Control Systems for Linac Test Facilities at Fermilab controls, linac, cryomodule, low-level-rf 334
  • 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.

TUP009 Development of Timing and Control Systems for Fast Beam Switch at KEK 8 GeV Linac linac, controls, positron, injection 404
  • K. Furukawa, M. Satoh, T. Suwada
    KEK, Ibaraki
  • A. Kazakov
    GUAS/AS, Ibaraki
  • T. Kudou, S. Kusano
    MELCO SC, Tsukuba
  • G. Lei, G.X. Xu
    IHEP Beijing, Beijing

The 8 GeV Linac at KEK provides electrons and positrons to Photon Factory (PF) and B-Factory (KEKB). Simultaneous top-up injections have been considered for both PF and KEKB rings in order to improve the injection efficiency and the stability. Fast beam-switching mechanisms are being implemented, upgrading the timing and control systems. While the present system provides precise timing signals for 150 devices, many of the signals will be dynamically switched using an event system. A new scheme has been developed and tested to enable double-fold synchronization between rf signals. Fast controls of low-level rf, beam instrumentation, a kicker, a gun, and beam operation parameters will also be upgraded.

TUP071 The ISAC-II SC-Linac Over Current Monitoring System ISAC, pick-up, linac, ion 557
  • A.K. Mitra, J.T. Drozdoff, K. Langton, R.E. Laxdal, M. Marchetto, W.R. Rawnsley, J.E. Richards
    TRIUMF, Vancouver

A personnel protection system is used to monitor the ion beam current into the experimental hall from the ISAC-II SC-linac. Two resonant capacitive pickups in the transfer line operate at the third harmonic of the bunch rate, 35.36 MHz, Ion charge, velocity and bunch width affect the sensitivity so calibration with dc Faraday cups is needed. Each monitor has a single conversion receiver with an active mixer. LO signals are provided by a frequency synthesizer locked to the accelerator synthesizer. The 1250 Hz IF signals are amplified, filtered with a 100 Hz bandwidth and amplitude detected. No image rejection is used as the background is due to on-frequency leakage from the RFQ and bunchers. An antenna in each monitor loosely couples a pulsed rf test signal to each pickup. These induced signals are mixed down to 11875 Hz, filtered, detected and used to provide watchdog signals. The measured currents are displayed through our EPICS control system which allows setting of the gain ranges, trip levels and conversion factors. The signals are also processed independently by dedicated ADC's and FPGA's to cause the Safety system to trip the beam if the current exceeds a nominal 10 nA.