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Joireman, P. W.

Paper Title Page
MOPAS011 Uniform Longitudinal Beam Profiles in the Fermilab Recycler Using Adaptive RF Correction 458
 
  • M. Hu, D. R. Broemmelsiek, B. Chase, J. L. Crisp, N. E. Eddy, P. W. Joireman, K. Y. Ng
    Fermilab, Batavia, Illinois
 
  Non-uniformity in longitudinal beam profiles due to potential well distortion have been observed in the Fermilab Recycler Ring. The main source of distortion, the analysis, and the experimental verification of a solution are presented. An adaptive algorithm has been developed to remove the distortion. This algorithm has been implemented in a custom FPGA-based module, which has been integrated into the current Low Level RF system.  
TUODKI03 Multi-batch Slip Stacking in the Main Injector at Fermilab 742
 
  • K. Seiya, T. Berenc, B. Chase, J. E. Dey, P. W. Joireman, I. Kourbanis, J. Reid
    Fermilab, Batavia, Illinois
 
  The Main Injector (MI) is going to use slip stacking scheme for the NuMI neutrino experiment for effectively increasing proton intensity to the NuMI target by about a factor two in a MI cycle. The MI is going to accept 11 pluses at injection energy from the Booster and accelerate them to 120 GeV. By using Slip stacking, two of them are merged into one and sent to Anti-proton production and 9 of them, one single and four doubled density pulses, are going to be sent to the Numi beam line. We have been doing low intensity beam studies with 11 pulses injection and accelerated them with the total intensity of 3·1012 ppp to 120GeV. We discuss beam loss and technical issues on multi-batch slip stacking.  
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TUZAC01 The ILC Control System Design 868
 
  • J. Carwardine, N. D. Arnold, F. Lenkszus, C. W. Saunders
    ANL, Argonne, Illinois
  • B. Banerjee, B. Chase, E. G. Gottschalk, P. W. Joireman, P. A. Kasley, J. R. Lackey, P. M. McBride, J. F. Patrick, V. Pavlicek, M. Votava, S. A. Wolbers
    Fermilab, Batavia, Illinois
  • R. W. Downing, R. S. Larsen
    SLAC, Menlo Park, California
  • K. Furukawa, S. Michizono
    KEK, Ibaraki
  • K. Rehlich, S. Simrock
    DESY, Hamburg
 
  Funding: Work supported in the U. S. by the U. S. Department of Energy under contract Nos. DE-AC02-06CH11357, DE-AC02-76CH03000, and DE-AC02-76SF00515.

The scale and performance parameters of the ILC require new thinking in regards to control system design. This design work has begun quite early in comparison to most accelerator projects, with the goal of uniquely high overall accelerator availability. Among the design challenges are high control system availability, timing reference distribution, standardization of interfaces, operability, and maintainability. We present the current state of the design and take a prospective look at ongoing research and development projects.

 
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WEOCKI04 Longitudinal Momentum Mining of Antiprotons at the Fermilab Recycler: Past, Present, and Future 1941
 
  • C. M. Bhat, B. Chase, C. Gattuso, P. W. Joireman
    Fermilab, Batavia, Illinois
 
  Funding: Operated by Universities Research Association, Inc. for the U. S. Department of Energy under contract DE-AC02-76CH03000.

The Recycler is the primary antiproton repository for the Tevatron collider at Fermilab. Stored antiproton beam intensity has been steadily increased to about 450·1010 over the last three years. We have used the technique of longitudinal momentum mining* in the Recycler to extract constant intensity and constant longitudinal emittance antiproton bunches for collider operation since early 2005. Since then, the Recycler has played a critical role in the luminosity performance of the Tevatron; the peak proton-antiproton luminosity has been raised by a factor of about three and a world record luminosity of 2.31·1032cm-2s-1 has been achieved. Recently, many improvements have been implemented in the antiproton mining and stacking schemes used in the Recycler to handle higher intensity beam. In this paper we discuss morphing during antiproton stacking, reducing longitudinal emittance dilution, and use of soft mining buckets to maintain low peak density and control the beam instability during mining. In addition we present past and current performance of mining and beam stacking RF manipulations.

* C. M. Bhat, Phys. Letts. A Vol. 330 (2004), p 481

 
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WEPMN112 Multichannel Vector Field Control Module for LLRF Control of Superconducting Cavities 2298
 
  • P. Varghese, B. Barnes, J. Branlard, B. Chase, P. W. Joireman, D. W. Klepec, U. Mavric, V. Tupikov
    Fermilab, Batavia, Illinois
 
  The field control of multiple superconducting RF cavities with a single Klystron, such as the proposed RF scheme for the ILC, requires high density (number of RF channels) signal processing hardware so that vector control may be implemented with minimum group delay. The MFC (Multichannel Field Control) module is a 33-channel, FPGA based downconversion and signal processing board in a single VXI slot, with 4 channels of high speed DAC outputs. An LO input of upto 1.6 GHz can be divided down to provide 8 clock signals through a clock distribution chip. A 32-bit, 400MHz floating point DSP provides additional computational capability for calibration and implementation of more complex control algorithms. Both the FPGA and DSP have external SDRAM memory for diagnostic data and nonvolatile Flash memory for program and configuration storage. Multiple high speed serial transceivers on the front panel and the backplane bus allow a flexible architecture for inter-module real time data exchanges. An interface CPLD supports the VXI bus protocol for communication to a Slot0 CPU, with Ethernet connections for remote in system programming of the FPGA and DSP as well as for data acquisition.