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| THPMN102 | A Muon Beam for Cooling Experiments | 2948 |
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Funding: Work supported by the US Department of Energy Within the framework of the Fermilab Muon Collider Task Force, the possibility of developing a dedicated muon test beam for cooling experiments has been investigated. Cooling experiments can be performed in a very low intensity muon beam by tracking single particles through the cooling device. With sufficient muon intensity and large enough cooling decrement, a cooling demonstration experiment may also be performed without resolving single particle trajectories, but rather by measuring the average size and position of the beam. This allows simpler, and thus cheaper, detectors and readout electronics to be used. This paper discusses muon production using 400MeV protons from the linac, decay channel and beamline design, as well as the instrumentation required for such an experiment, in particular as applied to testing the Helical Cooling Channel (HCC) proposed by Muons Inc. |
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| THPMN110 | The MANX Muon Cooling Demonstration Experiment | 2969 |
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Funding: Supported in part by DOE STTR grant DE-FG02-06ER86282 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. We describe and compare the experimental configuration for both single particle and beam profile measurement techniques based on G4Beamline simulations. |
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| THPAN102 | Tevatron Optics Measurements using an AC Dipole | 3465 |
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| The AC dipole is a device that can be used to study beam optics of hadron synchrotrons. It can produce sustained large amplitude oscillations with virtually no emittance growth. A vertical AC dipole for the Tevatron was recently implemented and a maximum oscillation amplitude of 2 (4) σ beam size at 980 (150) GeV was achieved. If such large oscillations are combined with the Tevatron's BPM system (20 micron resolution), not only linear but even nonlinear optics can be measured not depending on machine models. This paper discusses how to make model independent measurements of ring-wide beta functions using the AC dipole and shows test results and comparisons to other methods. The emittance preserving nature of the AC dipole allows multiple measurements on the same beam. By repeating measurements with a small change to the optics every time, the accuracy of measurements using the AC dipole can be determined. Results of such tests are also presented. | ||
| FRPMN068 | The 4.8 GHz LHC Schottky Pick-up System | 4174 |
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Funding: LARP The LHC Schottky observation system is based on traveling wave type high sensitivity pickup structures operating at 4.8 GHz. The choice of the structure and operating frequency is driven by the demanding LHC impedance requirements, where very low impedance is required below 2 GHz, and good sensitivity at the selected band at 4.8 GHz. A sophisticated filtering and triple down-mixing signal processing chain has been designed and implemented in order to achieve the specified 100 dB instantaneous dynamic range without range switching. Detailed design aspects for the complete systems and test results without beam are presented and discussed. |
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| FRPMS004 | Geometrical Interpretation of Nonlinearities from a Cylindrical Pick-up | 3862 |
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| In many accelerators, cylindrical pick-ups are used to measure transverse beam position. Although theoretically signals from these pick-ups are related to infinite power series of the beam position, in practice only finite number of terms are considered. Hence, the position measurements degrade when the beam position is far from the center of the pick-up. This paper shows that the power series of the beam position signal actually converges into a compact form with simple geometrical interpretation. It is then proven that with help of these geometrical relations the beam position can be expressed as a compact function of pick-up signals which includes infinite order of nonlinearities. The paper is concluded with a simple test of nonlinearities in signals using pick-ups of the Tevatron and numerical simulations to suggest a possible practical usage of this infinite order expression. | ||
| FRPMS005 | The Tevatron AC Dipole System | 3868 |
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| The AC dipole is an oscillating dipole magnet which can induce large amplitude oscillations without causing emittance growth. This makes it a good tool to measure optics of a hadron synchrotron. The vertical AC dipole for the Tevatron is powered by an inexpensive high-power audio amplifier since its operating frequency is approximately 20 kHz. The low impedance magnet is incorporated into a parallel resonant system to form an 8 Ω equivalent circuit to maximize the power output of the amplifier. The magnet used is a vertical pinger previously installed in the Tevatron making the cost relatively inexpensive. Recently, the initial system was upgraded with a more powerful amplifier and oscillation amplitudes up to 2-σ beam size were achieved at 980 GeV. The paper discusses details of the resonant circuit. It also shows test results of the system both on the bench and with the beam. | ||
| FRPMS008 | IPM Measurements in the Tevatron | 3883 |
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Funding: Work supported by the US Department of Energy Two Ionization Profile Monitors (IPMs) were installed in the Tevatron in 2006. The detectors are capable of resolving single bunches turn-by-turn, using a combination of gas injection to boost the ionization signal and very fast and sensitive electronics to detect it. This paper presents recent improvements to the system hardware and its use for beam monitoring. In particular, the correction of beam size oscillations observed at injection is discussed. |