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dipole

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TUA2C06 A Split-Function Lattice for Stochastic Cooling lattice, pick-up, kicker, proton 99
 
  • J. Wei
    BNL, Upton, Long Island, New York
  • S. Wang
    IHEP Beijing, Beijing
  Funding: * Work performed under the auspices of the US Department of Energy.

During the EPAC 2006 we reported the lattice design for rapid-cycling synchrotrons used to accelerate high-intensity proton beams to energy of tens of GeV for secondary beam production. After primary beam collision with a target, the secondary beam can be collected, cooled, accelerated or decelerated by ancillary synchrotrons for various applications. For the main synchrotron, the lattice has:

  1. flexible momentum compaction to avoid transition and to facilitate RF gymnastics
  2. long straight sections for low-loss injection, extraction, and high-efficiency collimation
  3. dispersion-free straights to avoid longitudinal-transverse coupling, and
  4. momentum cleaning at locations of large dispersion with missing dipoles.
Then, we present a lattice for a cooler ring for the secondary beam. The momentum compaction across half of this ring is near zero, while for the other half it is normal. Thus, bad mixing is minimized while good mixing is maintained for stochastic beam cooling. 		 
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THAP04 Optimization of the Magnet System for Low Energy Coolers electron, ion, gun, alignment 167
 
  • A. V. Bubley, V. M. Panasyuk, V. V. Parkhomchuk, V. B. Reva
    BINP SB RAS, Novosibirsk
  Aspects of magnet design and field measurements are discussed in the view of low energy coolers construction. The paper describes some engineering solutions for the magnetic field improvement which provides appropriate conditions for the cooling process as well as electron and ion beams motion.  
 
THAP09 Beam-based Field Alignment of the Cooling Solenoids for Fermilab’s Electron Cooler electron, antiproton, emittance, ground-motion 179
 
  • L. R. Prost, A. V. Shemyakin
    Fermilab, Batavia, Illinois
  Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy

The cooling section of FNAL’s electron cooler is composed of ten (10) 2 m-long, 105 G solenoids. When FNAL’s electron cooler (4.3 MeV, 0.1 A DC) was first install at the Recycler ring, the magnetic field of the cooling solenoid was carefully measured and compensated to attain the field quality necessary for effective cooling [V. Tupikov et al. COOL’05]. However, the tunnel ground motion deteriorates the field quality perceived by the beam over time. We have developed a technique which uses the cooling strength as an indication of the relative field quality and allowing us to re-align the longitudinal magnetic field in the successive solenoids of the cooling section assuming that the transverse component of the field in each solenoid has not varied.

 
 
THAP14 Pick-Up Electrode System for the CR Stochastic Cooling System pick-up, simulation, impedance, cryogenics 194
 
  • C. Peschke, F. Nolden
    GSI, Darmstadt
  The collector ring (CR) of the FAIR project will include a fast stochastic cooling system for exotic nuclei with a β of 0.83 and antiprotons with a β of 0.97. To reach a good signal to noise ratio of the pick-up even with a low number of particles, a cryogenic movable pick-up electrode system based on slotlines is under development. The sensitivity and noise properties of an electrode array has been calculated using field-simulation and equivalent circuits. For three-dimensional field measurements, an E-near-field probe moved by a computer controlled mapper has been used.  
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