| Paper |
Title |
Page |
| MOPP090 |
Incorporating RF into a Muon Helical Cooling Channel
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760 |
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- S. A. Kahn, M. Alsharo'a, R. P. Johnson
Muons, Inc, Batavia
- D. R. Broemmelsiek, A. Jansson, V. Kashikhin, V. S. Kashikhin, A. L. Klebaner, G. F. Kuznetsov, G. V. Romanov, A. V. Shemyakin, D. Sun, K. Yonehara, A. V. Zlobin
Fermilab, Batavia, Illinois
- L. Thorndahl
CERN, Geneva
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A helical cooling channel (HCC) consisting of a pressurized gas absorber imbedded in a magnetic channel that provides solenoidal, helical dipole and helical quadrupole fields has shown considerable promise in providing six-dimensional cooling for muon beams. The energy lost by muons traversing the gas absorber needs to be replaced by inserting RF cavities into the lattice. Replacing the substantial muon energy losses using RF cavities with reasonable gradients will require a significant fraction of the channel length be devoted to RF. However, to provide the maximum phase space cooling and minimal muon losses, the helical channel should have a short period and length. In this paper we shall examine three approaches to include RF cavities into the HCC lattice: - Use higher frequency cavities that can be placed inside the magnetic channel,
- Interleave cavities between magnetic coil rings, and
- Place banks of RF cavities between segments of HCC channels.
Each of these approaches has positive and negative features that need to be evaluated in selecting the proper concept for including RF into the HCC system.
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| WEPC144 |
Test Results of the AC Field Measurements of Fermilab Booster Corrector Magnets
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2347 |
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- J. DiMarco, D. J. Harding, V. S. Kashikhin, S. Kotelnikov, M. J. Lamm, A. Makulski, R. Nehring, D. F. Orris, P. Schlabach, C. Sylvester, M. Tartaglia, J. C. Tompkins, G. Velev
Fermilab, Batavia, Illinois
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Multi-element corrector magnets are being produced at Fermilab that will enable correction of orbits and tunes through the entire cycle of the Booster, not just at injection. The corrector package includes six different corrector elements - normal and skew orientations of dipole, quadrupole, and sextupole - each independently powered. The magnets have been tested during typical AC ramping cycles at 15Hz using a fixed coil system to measure the dynamic field strength and field quality. The fixed coil is comprised of an array of inductive pick-up coils around the perimeter of a cylinder which are sampled simultaneously at 100kHz with 24-bit ADC’s. The performance of the measurement system and a summary of the field results are presented and discussed.
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| WEPD013 |
Four-Coil Superconducting Helical Solenoid Model for Muon Beam Cooling
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2431 |
| |
- V. S. Kashikhin, N. Andreev, A. N. Didenko, V. Kashikhin, M. J. Lamm, A. V. Makarov, K. Yonehara, A. V. Zlobin
Fermilab, Batavia, Illinois
- R. P. Johnson, S. A. Kahn
Muons, Inc, Batavia
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Novel configurations of superconducting magnets for helical muon beam cooling channels and demonstration experiments are being designed at Fermilab. The magnet system for helical cooling channels has to generate longitudinal solenoidal and transverse helical dipole and helical quadrupole fields. This paper discusses the Helical Solenoid model design and manufacturing of a 0.6 m diameter, 4-coil solenoid prototype to prove the design concept, fabrication technology, and the magnet system performance. Results of magnetic and mechanical designs with the 3D analysis by TOSCA, ANSYS and COMSOL will be presented. The model quench performance and the test setup in the FNAL Vertical Magnet Test Facility cryostat will be discussed.
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| WEPD014 |
Magnets for the MANX 6-D Muon Cooling Demonstration Experiment
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2434 |
| |
- V. S. Kashikhin, N. Andreev, V. Kashikhin, M. J. Lamm, K. Yonehara, A. V. Zlobin
Fermilab, Batavia, Illinois
- M. Alsharo'a, R. P. Johnson, S. A. Kahn, T. J. Roberts
Muons, Inc, Batavia
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MANX is a 6-dimensional muon ionization-cooling experiment that has been proposed to Fermilab to demonstrate the use of a helical cooling channel (HCC) for muon beam emittance reduction for future muon colliders and neutrino factories. The HCC for MANX has solenoidal, helical dipole, and helical quadrupole magnetic components, which diminish as the beam loses energy as it slows down in the liquid helium absorber inside the magnet. The proposed magnet system design is comprised of coil rings positioned along a helical path, which will provide the desired solenoidal and helical dipole and quadrupole fields. Additional magnets that provide emittance matching between the HCC and the upstream and downstream spectrometers are also described. The results of a G4Beamline simulation of the beam cooling behavior of the magnet and absorber system will be presented.
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| WEPD015 |
Design Studies of Magnet Systems for Muon Helical Cooling Channels
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2437 |
| |
- V. Kashikhin, V. S. Kashikhin, M. J. Lamm, M. L. Lopes, A. V. Zlobin
Fermilab, Batavia, Illinois
- M. Alsharo'a, R. P. Johnson, S. A. Kahn
Muons, Inc, Batavia
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Helical cooling channels consisting of a magnet system with superimposed solenoid, helical dipole and quadrupole fields, and a pressurized gas absorber in the aperture, promise high efficiency in providing 6D muon beam cooling for a future Muon Collider and some other applications. Two alternative designs of the magnet system for the helical cooling channel are being investigated at the present time. The first one is based on a straight, large aperture solenoid with helical dipole and quadrupole coils. The other one is based on a spiral solenoid which generates the main solenoid field and the helical dipole and quadrupole components. Both concepts have been developed and compared for the MANX experiment. In this paper we continue design studies and comparison of these two concepts for the high field sections of a helical cooling channel. The results of magnetic and mechanical analysis as well as the superconductor choice and specifications will be presented and discussed.
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| WEPD036 |
Radiation and Thermal Analysis of Superconducting Quadrupoles in the Interaction Region of Linear Collider
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2488 |
| |
- A. V. Zlobin, A. I. Drozhdin, V. Kashikhin, V. S. Kashikhin, M. L. Lopes, N. V. Mokhov
Fermilab, Batavia, Illinois
- A. Seryi
SLAC, Menlo Park, California
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The upcoming and disrupted electron and positron beams in the baseline design of ILC interaction region are focused by compact FD doublets each consisting of two small-aperture superconducting quadrupoles and multipole correctors. These magnets will work in a severe radiation environment generated primarily by incoherent pairs and radiative Bhabhas. This paper analyzes the radial, azimuthal and longitudinal distributions of radiation heat deposition in incoming and disrupted beam doublets. Operation margins of baseline quadrupoles based on NbTi superconductor and direct wind technology as well as alternative designs based on NbTi or Nb3Sn Rutherford cables are calculated and compared. The possibilities of reducing the heat deposition in magnet coils using internal absorbers are discussed.
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| WEPP153 |
Status of the MANX Muon Cooling Experiment
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2844 |
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- K. Yonehara, D. R. Broemmelsiek, M. Hu, A. Jansson, V. Kashikhin, V. S. Kashikhin, M. J. Lamm, M. L. Lopes, V. D. Shiltsev, V. Yarba, M. Yu, A. V. Zlobin
Fermilab, Batavia, Illinois
- R. J. Abrams, M. A.C. Cummings, R. P. Johnson, S. A. Kahn, T. J. Roberts
Muons, Inc, Batavia
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MANX is an experiment to prove that effective six-dimensional (6D) muon beam cooling can be achieved a Helical Cooling Channel (HCC) using ionization-cooling with helical and solenoidal magnets in a novel configuration. The aim is to demonstrate that 6D muon beam cooling is understood well enough to plan intense neutrino factories and high-luminosity muon colliders. The experiment consists of the HCC magnets that envelop a liquid helium energy absorber, upstream and downstream instrumentation to measure the particle or beam parameters before and after cooling, and emittance matching sections between the detectors and the HCC. Studies are presented of the effects of detector resolution and magnetic field errors on the beam cooling measurements.
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