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| MOPAS016 |
New Corrector System for the Fermilab Booster
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467 |
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- E. Prebys, C. C. Drennan, D. J. Harding, V. S. Kashikhin, J. R. Lackey, A. V. Makarov, W. Pellico
Fermilab, Batavia, Illinois
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Funding: Work supported under DOE contract DE-AC02-76CH03000.
The Fermilab neutrino program places unprecedented demands on the lab's 8 GeV Booster synchrotron, which has not changed significantly since it was built almost 35 years ago. In particular, the existing corrector system is not adequate to control beam position and tune throughout the acceleration system, and provides limited compensation for higher order resonances. We present an ambitious ongoing project to build and install a set of 48 corrector packages, each containing horizontal and vertical dipoles, normal and skew quadrupoles, and normal and skew sextupoles. Space limitations in the machine have motivated a unique design, which utilizes custom wound coils around a 12 pole laminated core. Each of the 288 discrete multipole elements in the system will have a dedicated power supply, the output current of which is controlled by an individual programmable ramp. This provides for great flexibility in the system, but also presents a challenge in terms of designing the control hardware and software in such a way that the system can be operated in the most efficacious way.
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| MOPAS005 |
System Overview for the Multi-element Corrector Magnets and Controls for the Fermilab Booster
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449 |
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- C. C. Drennan, M. Ball, A. R. Franck, D. J. Harding, P. A. Kasley, G. E. Krafczyk, M. J. Kucera, J. R. Lackey, D. McArthur, J. R. Misek, W. Pellico, E. Prebys, A. K. Triplett, D. Wolff
Fermilab, Batavia, Illinois
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Funding: Work supported by the U. S. Department of Energy
To better control the beam position, tune, and chromaticity in the Fermilab Booster synchrotron, a new package of six corrector elements has been designed, incorporating both normal and skew orientations of dipole, quadrupole, and sextupole magnets. The devices are under construction and will be installation in 48 locations in the Booster accelerator. Each of these 288 corrector magnets will be individually powered. Each of the magnets will be individually controlled using operator programmed current ramps designed specifically for the each type of Booster acceleration cycle. This paper provides an overview of the corrector magnet installation in the accelerator enclosure, power and sensor interconnections, specifications for the switch-mode power supplies, rack and equipment layouts, controls and interlock electronics, and the features of the operator interface for programming the current ramps and adjusting the timing of the system triggers.
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| TUOAAB02 |
Measurement and Simulation of Space-Charge Dependent Tune Separation in FNAL Booster
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772 |
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- D. O. McCarron
IIT, Chicago, Illinois
- J. F. Amundson, W. Pellico, P. Spentzouris, R. E. Tomlin
Fermilab, Batavia, Illinois
- L. K. Spentzouris
Illinois Institute of Technology, Chicago, Illinois
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In recent years, a number of space-charge studies have been performed in the FNAL Booster. The Booster is the first circular accelerator in the Fermilab chain of accelerators, with an injection energy of 400 MeV. The combination of this relatively low injection energy and improving beam intensity for Booster's high intensity applications necessitates a study of space charge dynamics. Measurement and simulation of space charge coupling in the Booster will be presented. The coupling measurement was performed using a standard technique, albeit repeated for different injected beam intensities. The initial transverse tune separation was minimized (Qx=Qy=6.7), followed by a systematic skew quadrupole strength variation. Transverse beam oscillation frequencies were recorded while exciting the beam. These frequencies were recorded for a range of 1.0·1012 to 3.5·1012 particles. A linear increase in the measured tune separation with beam intensity was observed. For comparison, beam coupling was also simulated with the space-charge code Synergia. This code has successfully modeled the space-charge tune shift in the Booster*, and compares favorably to other space charge codes and analytic results.
* Synergia: A 3D Accelerator Modelling Tool with 3D Space Charge. Journal of Computational Physics, Volume 211, Issue 1 , 1 January 2006, Pages 229-248.
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Slides
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| TUPAS040 |
Momentum Spread Reduction at Beam Extraction from the Fermilab Booster at Slipstacking Injection to the Main Injector
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1733 |
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- A. I. Drozhdin, W. Pellico, X. Yang
Fermilab, Batavia, Illinois
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In order to reduce the momentum spread of the beam at extraction from the Booster to the Main Injector with slip stacking injection, the bunch rotation at the end of the cycle is applied. However, the fast RF voltage reduction often causes beam loading issues to Booster RF cavities, and the reliability of extracted beam becomes a problem. An alternative solution is investigated - modulating the RF voltage with twice of the synchrotron frequency introduces bunch length oscillation, and the beam is extracted at the time when the bunch length reaches maximum and the momentum spread becomes minimal.
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| TUPAS041 |
Injection Parameters Optimization for the Fermilab Booster
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1736 |
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- A. I. Drozhdin, W. Pellico, X. Yang
Fermilab, Batavia, Illinois
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The maximal capacitance for the Booster to deliver the 8-GeV beam to downstream accelerators is limited by the beam loss. Most of losses happen at injection due to space charge effect being the strongest at the injection energy. Optimizing the RF voltage ramp in the presence of the space charge effect to capture more beam and simultaneously keep small beam emittance has been numerically investigated using 3-D STRUCT code. The results of simulations agree well with the measurements in the machine. Possibilities, such as beam painting and using the second rf harmonic at injection, for further reductions of beam loss in order to reach the maximum beam intensity delivered from the Booster have been investigated.
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| TUPAS042 |
Transition Crossing Simulation at the Fermilab Booster
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1739 |
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- A. I. Drozhdin, W. Pellico, X. Yang
Fermilab, Batavia, Illinois
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The demand in high intensity and low emittance of the beam extracted from the Booster requires a better control over the momentum spread growth and bunch length shortening at transition, in order to prevent beam loss and coupled bunch instability. Since the transition crossing involves both longitudinal and transverse dynamics, the recently modified 3-D STRUCT code provides an opportunity to numerically investigate different transition schemes in the machine environment, and apply the results of simulation to minimize the beam loss and emittance growth operationally.
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