31 Matching Results

Search Results

Advanced search parameters have been applied.

Momentum Cogging at the Fermilab Booster

Description: The Fermilab Booster has an upgrade plan called the Proton Improvement Plan (PIP). The flux throughput goal is 2E17 protons/hour which, is almost double the present flux, 1.1E17 protons/hour. The beam loss in the machine is going to be an issue. The Booster accelerates beam from 400 MeV to 8 GeV and extracts to the Main Injector (MI). The current cogging process synchronizes the extraction kicker gap to the MI by changing radial position of the beam during the cycle. The gap creation occurs at about 700 MeV, which is about 6 ms into the cycle. The cycle-to-cycle variations of the Booster are larger at lower energy. However, changing the radial position at low energy for cogging is limited because of aperture. Momentum cogging is able to move the gap creation to an earlier time by using dipole correctors and radial position feedback, and is able to control the revolution frequency and radial position at the same time. The new cogging is expected to reduce beam loss and not be limited by aperture. The progress of the momentum cogging system development is going to be discussed in this paper.
Date: May 1, 2012
Creator: Seiya, K.; Drennan, C.; Pellico, W.A.; Triplett, K.; Waller, A. & /Fermilab
Partner: UNT Libraries Government Documents Department

A conceptual design of the 2+ MW LBNE beam absorber

Description: The Long Baseline Neutrino Experiment (LBNE) will utilize a neutrino beamline facility located at Fermilab. The facility will aim a beam of neutrinos, produced by 60-120 GeV protons from the Fermilab Main Injector, toward a detector placed at the Deep Underground Science and Engineering Laboratory (DUSEL) in South Dakota. Secondary particles that do not decay into muons and neutrinos as well as any residual proton beam must be stopped at the end of the decay region to reduce noise/damage in the downstream muon monitors and reduce activation in the surrounding rock. This goal is achieved by placing an absorber structure at the end of the decay region. The requirements and conceptual design of such an absorber, capable of operating at 2+ MW primary proton beam power, is described.
Date: March 1, 2011
Creator: Velev, G.; Childress, S.; Hurh, P.; Hylen, J.; Makarov, A.; Mohkhov, N. et al.
Partner: UNT Libraries Government Documents Department

Novel Muon Beam Facilities for Project X at Fermilab

Description: Innovative muon beam concepts for intensity-frontier experiments such as muon-to-electron conversion are described. Elaborating upon a previous single-beam idea, we have developed a design concept for a system to generate four high quality, low-energy muon beams (two of each sign) from a single beam of protons. As a first step, the production of pions by 1 and 3 GeV protons from the proposed Project X linac at Fermilab is being simulated and compared with the 8-GeV results from the previous study.
Date: May 1, 2012
Creator: Neuffer, D.V.; /Fermilab; Ankenbrandt, C.M.; Abrams, R.; Roberts, T.J.; Yoshikawa, C.Y. et al.
Partner: UNT Libraries Government Documents Department

Alignment and Aperture Scan at the Fermilab Booster

Description: The Fermilab Booster is currently in the process of an intensity upgrade referred to as the Proton Improvement Plan (PIP). The goal of PIP is to have the Booster provide a proton beam flux of 2 x 10{sup 17} protons/hour. This is almost double the current operation of 1.1 x 10{sup 17} protons/hour. Beam losses in the machine due to the increased flux will create larger integrated doses on aperture limiting components that will need to be mitigated. The Booster accelerates beam from 400 MeV to 8 GeV at a rep rate of 15hz and then extracts beam to the Main Injector. Several percent of the beam is lost within 3 msec after injection in the early part of acceleration. The aperture at injection energy was recently measured using corrector scans. Along with magnet survey data and aperture scan data a plan to realign the magnets in the Booster was developed and implemented in May 2012. The beam studies, analysis of the scan and alignment data, and the result of the magnet moves are presented.
Date: May 1, 2012
Creator: Seiya, K.; Lackey, J.; Marsh, W.; Pellico, W.; Still, D.; Triplet, K. et al.
Partner: UNT Libraries Government Documents Department

High power couplers for Project X

Description: Project X, a multi-megawatt proton source under development at Fermi National Accelerator Laboratory. The key element of the project is a superconducting (SC) 3GV continuous wave (CW) proton linac. The linac includes 5 types of SC accelerating cavities of two frequencies.(325 and 650MHz) The cavities consume up to 30 kW average RF power and need proper main couplers. Requirements and approach to the coupler design are discussed in the report. New cost effective schemes are described. Results of electrodynamics and thermal simulations are presented.
Date: March 1, 2011
Creator: Kazakov, S.; Champion, M.S.; Yakovlev, V.P.; Kramp, M.; Pronitchev, O.; Orlov, Y. et al.
Partner: UNT Libraries Government Documents Department

Beam-beam effects in the Tevatron

Description: The Tevatron in Collider Run II (2001-present) is operating with 6 times more bunches, many times higher beam intensities and luminosities than in Run I (1992-1995). Electromagnetic long-range and head-on interactions of high intensity proton and antiproton beams have been significant sources of beam loss and lifetime limitations. We present observations of the beam-beam phenomena in the Tevatron and results of relevant beam studies. We analyze the data and various methods employed in operations, predict the performance for planned luminosity upgrades, and discuss ways to improve it.
Date: January 1, 2005
Creator: Shiltsev, V.; Alexahin, Y.; Lebedev, V.; Lebrun, P.; Moore, R.S.; Sen, T. et al.
Partner: UNT Libraries Government Documents Department

Beam Studies with Electron Columns

Description: We report preliminary results of experimental studies of 'electron columns' in the Tevatron and in a specialized test setup. In the Tevatron, a beam of 150 GeV protons ionizes residual gas and ionization electrons are stored in an electrostatic trap immersed into strong longitudinal magnetic field. Shifts of proton betatron frequencies are observed. In the test setup, we observe effects pointing to accumulation and escape of ionization electrons.
Date: April 1, 2009
Creator: Shiltsev, V.; Valishev, A.; Kuznetsov, G.; /Fermilab; Kamerdzhiev, V.; /Julich, Forschungszentrum et al.
Partner: UNT Libraries Government Documents Department

Summary of the Superconducting RF Linac for Muon Collider and Neutrino Factory

Description: Project-X is a proposed project to be built at Fermi National Accelerator Laboratory with several potential missions. A primary part of the Project-X accelerator chain is a Superconducting linac, and In October 2009 a workshop was held to concentrate on the linac parameters. The charge of the workshop was to 'focus only on the SRF linac approaches and how it can be used'. The focus of Working Group 2 of this workshop was to evaluate how the different linac options being considered impact the potential realization of Muon Collider (MC) and Neutrino Factory (NF) applications. In particular the working group charge was, 'to investigate the use of a multi-megawatt proton linac to target, phase rotate and collect muons to support a muon collider and neutrino factory'. To focus the working group discussion, three primary questions were identified early on, to serve as a reference: (1) What are the proton source requirements for muon colliders and neutrino factories? (2) What are the issues with respect to realizing the required muon collider and neutrino factory proton sources - (a) General considerations and (b) Considerations specific to the two linac configurations identified by Project-X? (3) What things need to be done before we can be reasonably confident that ICD1/ICD2 can be upgraded to provide the neutrino factory/muon collider needs? A number of presentations were given, and are available at the workshop web-site. This paper does not summarize the individual presentations, but rather addresses overall findings as related to the three guiding questions listed above.
Date: January 1, 2010
Creator: Galambos, J.; Ridge, /Oak; Garoby, R.; /CERN; Geer, S. & /Fermilab
Partner: UNT Libraries Government Documents Department

Neutral particle production in pi- d reactions at 200 GeV/c

Description: Characteristics of {pi}{sup o} production and K{sup o}, {Lambda}, {bar {Lambda}}, production in {pi}{sup -}d interactions at 200 GeV are presented. The data are obtained from a 70,000 picture exposure of the FNAL 30-inch deuterium-filled bubble chamber. Comparison with pion proton data at similar energies and pion deuterium data at lower energies are made.
Date: April 1, 1975
Creator: Csorna, S.; Dunn, L.; Kocsis, A.; Lubatti, H.J.; Moriyasu, K.; Tressel, P. et al.
Partner: UNT Libraries Government Documents Department

Summary of sessions B and F: High intensity linacs and frontend & proton drivers

Description: This paper summarizes the sessions B&F of the 33rd ICFA Advanced Beam Dynamics Workshop on High Intensity & High Brightness Hadron Beams held in Bensheim, Germany. It covers high intensity linacs, front ends and proton driver topics.
Date: January 1, 2005
Creator: Ferdinand, R.; /Saclay; Chou, W.; /Fermilab; Galambos, J. & Ridge, /Oak
Partner: UNT Libraries Government Documents Department

Proton bunch compression strategies

Description: The paper discusses main limitations on the beam power and other machine parameters for a 4 MW proton driver for muon collider. The strongest limitation comes from a longitudinal microwave instability limiting the beam power to about 1 MW for an 8 GeV compressor ring.
Date: October 1, 2009
Creator: Lebedev, Valeri
Partner: UNT Libraries Government Documents Department

Parameters for a 'Project-X'-based Muon Collider

Description: A set of parameters for a 4TeV {mu}{sup +}-{mu}{sup -} Collider based on the use of 'Project-X' as the proton source for p production is presented. The scenario uses 56 GeV protons from the 'Main Injector', bunches these protons in a new buncher to 9 {approx} 1m long bunches. The estimated luminosity is {approx} 4 x 10{sup 34} cm{sup -2}s{sup -1}, with several potential upgrade possibilities.
Date: August 1, 2007
Creator: Neuffer, David
Partner: UNT Libraries Government Documents Department

Electron lenses for compensation of beam-beam effects: Tevatron, RHIC, LHC

Description: Since previous BEAM'06 workshop a year ago, significant progress has been made in the field of beam-beam compensation (BBC)--it has been experimentally demonstrated that both Tevatron Electron Lenses (TEL) significantly improve proton and luminosity lifetimes in high-luminosity stores. This article summarizes these results and discusses prospects of the BBC in Tevatron, RHIC and LHC.
Date: December 1, 2007
Creator: Shiltsev, V.
Partner: UNT Libraries Government Documents Department

Baseline scenario(s) for muon collider proton driver

Description: This paper gives an overview of the various muon collider scenarios and the requirements they put on the Proton Driver. The required proton power is about 4-6MW in all the scenarios, but the bunch repetition rate varies between 12 and 65Hz. Since none of the muon collider scenarios have been simulated end-to-end, it would be advisable to plan for an upgrade path to around 10MW. Although the proton driver energy is flexible, cost arguments seems to favor a relatively low energy. In particular, at Fermilab 8GeV seems most attractive, partly due to the possibility of reusing the three existing fixed energy storage rings for bunch manipulations.
Date: July 1, 2008
Creator: Jansson, Andreas
Partner: UNT Libraries Government Documents Department

Optics of a 1.5 TeV injector for the LHC

Description: A concept is being developed to install a second, low energy ring (LER) above the LHC to accelerate protons from 450 GeV to 1.5 TeV prior to injection into the LHC. The arc and dispersion suppresser optics of the LHC would be replicated in the LER using combined function ''transmission line'' magnets originally proposed for the VLHC. To avoid costly civil construction, in the straight sections housing detectors at least, the LER and LHC must share beampipes and some magnets through the detector portion of the straights. Creating the appropriate optics for these LER-LHC transition regions is very challenging: In addition to matching to the nominal LHC lattice functions at these locations the changes in altitude of 1.35 m separating the LER and LHC must be performed achromatically to avoid emittance blowup arising from vertical dispersion when the beams are transferred to the LHC.
Date: July 1, 2006
Creator: Johnstone, John A.
Partner: UNT Libraries Government Documents Department

Superconducting radiofrequency linac development at Fermilab

Description: As the Fermilab Tevatron Collider program draws to a close, a strategy has emerged of an experimental program built around the high intensity frontier. The centerpiece of this program is a superconducting H- linac that will support world leading programs in long baseline neutrino experimentation and the study of rare processes. Based on technology shared with the International Linear Collider, Project X will provide multi-MW beams at 60-120 GeV from the Main Injector, simultaneous with very high intensity beams at lower energies. Project X also supports development of a Muon Collider as a future facility at the energy frontier.
Date: October 1, 2009
Creator: Holmes, Stephen D.
Partner: UNT Libraries Government Documents Department

Diagnostics of the Fermilab Tevatron using an AC dipole

Description: The Fermilab Tevatron is currently the world's highest energy colliding beam facility. Its counter-rotating proton and antiproton beams collide at 2 TeV center-of-mass. Delivery of such intense beam fluxes to experiments has required improved knowledge of the Tevatron's beam optical lattice. An oscillating dipole magnet, referred to as an AC dipole, is one of such a tool to non-destructively assess the optical properties of the synchrotron. We discusses development of an AC dipole system for the Tevatron, a fast-oscillating (f {approx} 20 kHz) dipole magnet which can be adiabatically turned on and off to establish sustained coherent oscillations of the beam particles without affecting the transverse emittance. By utilizing an existing magnet and a higher power audio amplifier, the cost of the Tevatron AC dipole system became relatively inexpensive. We discuss corrections which must be applied to the driven oscillation measurements to obtain the proper interpretation of beam optical parameters from AC dipole studies. After successful operations of the Tevatron AC dipole system, AC dipole systems, similar to that in the Tevatron, will be build for the CERN LHC. We present several measurements of linear optical parameters (beta function and phase advance) for the Tevatron, as well as studies of non-linear perturbations from sextupole and octupole elements.
Date: August 1, 2008
Creator: Miyamoto, Ryoichi & U., /Texas
Partner: UNT Libraries Government Documents Department

Cascade Showers Originated in Proton-Nucleus Collisions

Description: Cascade showers originated in nuclear showers occurred by the proton beam with the highest energy in an emulsion chamber will be investigated for their longitudinal development and lateral structure. The results will be compared with that of 400 GeV proton (No.434) and that of 300 GeV negative pions (No.506). The cascade showers originated in nuclear shower have been studying by using data of the emulsion chamber exposed to 400 GeV proton beam (No.434) and 300 GeV negative pion beam (No.506). The purpose of these experiment was to observe the longitudinal development and the lateral structure of the nuclear cascade shower, and the difference of their interactions. We propose to perform the same kind of experiment as the above by exposing emulsion chambers to the proton beam of Tevatron (800 GeV). We can investigate the difference of interactions due to their energies through the evidence of these nuclear cascade showers. Especially, these inelasticity distributions to photons in previous energies could not be presented with good accuracy for the bias of low energy side, but this point in the experiment will become better by using data from the proton beam of Tevatron.
Date: January 1, 1985
Creator: Dake, S.; Nakata, K.; Oda, H.; U., /Kobe; Ogata, T.; Saito, T. et al.
Partner: UNT Libraries Government Documents Department

Experimental demonstration of beam-beam compensation by Tevatron electron lenses and prospects for the LHC

Description: Electromagnetic long-range and head-on interactions of high intensity proton and antiproton beams are significant sources of beam loss and lifetime limitations in the Tevatron Collider Run II (2001-present). We present observations of the beam-beam phenomena in the Tevatron and results of relevant beam studies. We analyze the data and various methods employed in high energy physics (HEP) operation, predict the performance for planned luminosity upgrades and discuss ways to improve it.
Date: June 1, 2007
Creator: Shiltsev, V.; Alexahin, Y.; Kamerdzhiev, V.; Kuznetsov, G.; Zhang, X.L.; /Fermilab et al.
Partner: UNT Libraries Government Documents Department

A Complete Scheme of Ionization Cooling for a Muon Collider

Description: The conclusions of this report are: (1) New 1.5 TeV Collider lattice has more conservative IP parameters--(a) Luminosity 1 x 10{sup 34} achieved with bunch rep rate {approx}12 Hz but requires depth {approx}135 (m) to limit neutrino radiation, (b) Collider ring must be deep (eg 135 m of ILC) to control neutrino radiation, and (c) Proton driver ({approx}4 MW) is challenging; (2) Complete cooling scheme achieves required muon parameters--All components simulated (at some level) with realistic parameters, but much work remains; (3) Possible problem with rf breakdown in specified magnetic fields--Solutions with gas in cavities appear to work, and designs with open cell rf are promising; and (4) Lower cost acceleration possible using pulsed magnets in synchrotrons--Rings fit in Tevatron tunnel, and second ring uses hybrid of fixed and pulsed magnets.
Date: November 1, 2007
Creator: Palmer, Robert B.; Berg, J.Scott; Fernow, Richard C.; Gallardo, Juan Carlos; Kirk, Harold G.; /Brookhaven et al.
Partner: UNT Libraries Government Documents Department

Bunch-by-bunch detection of coherent transverse modes from digitized single-bpm signals in the Tevatron

Description: A system was developed for bunch-by-bunch detection of transverse proton and antiproton coherent oscillations based on the signal from a single beam-position monitor (BPM) located in a region of the ring with large amplitude functions. The signal is digitized over a large number of turns and Fourier-analyzed offline with a dedicated algorithm. To enhance the signal, the beam is excited with band-limited noise for about one second, and this was shown not to significantly affect the circulating beams even at high luminosity. The system is used to measure betatron tunes of individual bunches and to study beam-beam effects. In particular, it is one of the main diagnostic tools in an ongoing study of nonlinear beam-beam compensation studies with Gaussian electron lenses. We present the design and operation of this tool, together with results obtained with proton and antiproton bunches.
Date: May 1, 2010
Creator: Stancari, G.; Valishev, A.; Semenov, A. & /Fermilab
Partner: UNT Libraries Government Documents Department

Dynamics of R.F. Captured Electron Cooled Proton Beams

Description: In the course of electron cooling experiments at the Electron Cooling Ring (ECR) at Fermilab, several peculiar features of the longitudinal phase space of cold protons (200 MeV) captured in R.F. buckets were observed. Here we present the experimental facts, present a simple theory, and summarize computer simulation results which support the theory and facts. The experimental apparatus and measurement techniques have been described elsewhere. R.F. bunching was achieved with a single PPA, loaded cavity gap driven at harmonic number 6({approx} 7.56 MHz) of the revolution frequency. R.F. voltage could be developed across this gap sufficient to entirely capture even the uncooled circulating proton beam ({delta}p/p FWHM = 0.17%).
Date: January 1, 1983
Creator: Kells, W. & Mills, F.
Partner: UNT Libraries Government Documents Department

Optimization of the Helical Orbits in the Tevatron

Description: To avoid multiple head-on collisions the proton and antiproton beams in the Tevatron move along separate helical orbits created by 7 horizontal and 8 vertical electrostatic separators. Still the residual long-range beam-beam interactions can adversely affect particle motion at all stages from injection to collision. With increased intensity of the beams it became necessary to modify the orbits in order to mitigate the beam-beam effect on both antiprotons and protons. This report summarizes the work done on optimization of the Tevatron helical orbits, outlines the applied criteria and presents the achieved results.
Date: June 1, 2007
Creator: Alexahin, Y.
Partner: UNT Libraries Government Documents Department