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THE TWO-BEAM ACCELERATOR

Description: A Two-Beam Accelerator, in which one of the beams is an intense low energy beam made to undergo free electron lasing and the other beam is a compact bunch of high energy electrons, is shown to be an interesting possibility for a linear collider.
Date: April 1, 1984
Creator: Hopkins, D.B.; Sessler, A.M. & Wurtele, J.S.
Partner: UNT Libraries Government Documents Department

ATLAS Metadata Task Force

Description: This document provides an overview of the metadata, which are needed to characterizeATLAS event data at different levels (a complete run, data streams within a run, luminosity blocks within a run, individual events).
Date: April 4, 2007
Creator: Collaboration, ATLAS; Costanzo, D.; Cranshaw, J.; Gadomski, S.; Jezequel, S.; Klimentov, A. et al.
Partner: UNT Libraries Government Documents Department

Summary report for the Microwave Source Working Group

Description: This report summarizes the discussions of the Microwave Source Working Group during the Advanced Accelerator Concepts Workshop held October 13-19, 1996 in the Granlibakken Conference Center at Lake Tahoe, California. Progress on rf sources being developed for linear colliders is reviewed. Possible choices for high-power rf sources at 34 GHz and 94 GHz for future colliders are examined. 27 refs.
Date: January 1, 1997
Creator: Westenskow, G. A.
Partner: UNT Libraries Government Documents Department

Emittance dilution due to slow alignment drifts in the main linacs of the NLC

Description: The tight tolerances in the main linacs of the Nest Linear Collider (NLC) result in a large sensitivity of the beam emittance to slow alignment drifts. Once the accelerator is tuned, the optimized emittances must be maintained. Slow alignments drifts will make resteering and reoptimization necessary. The frequency of these linac reoptimizations is an important parameter that determines how well the linear collider can be operated. We present simulation results that address this question for the main linacs of the NLC. We will show that the effects of alignment drifts can indeed be handled.
Date: September 1, 1996
Creator: Assmann, R.; Adolphsen, C. & Bane, K.
Partner: UNT Libraries Government Documents Department

Modeling large heterogeneous RF structures

Description: Large heterogeneous structures are difficult to model on a numerical grid because of the limitations on computing resources, so that alternate approaches such as equivalent circuits and mode-matching have been developed to treat this problem. This paper will describe the three methods and will analyze a structure representative of the SLAC and JLC detuned structures to compare the efficacy of each approach.
Date: November 1, 1996
Creator: Li, Zenghai; Ko, Kwok; Srinivas, V. & Higo, Toshiyasu
Partner: UNT Libraries Government Documents Department

Alignment tolerance of accelerating structures and corrections for future linear colliders

Description: The alignment tolerance of accelerating structures is estimated by tracking simulations. Both single-bunch and multi-bunch effects are taken into account. Correction schemes for controlling the single and multi-bunch emittance growth in the case of large misalignment are also tested by simulations.
Date: June 1, 1995
Creator: Kubo, K.; Adolphsen, C.; Bane, K.L.F.; Raubenheimer, T.O. & Thompson, K.A.
Partner: UNT Libraries Government Documents Department

NLC positron production target

Description: The NLC positron production target is optimized with respect to positron yield, target integrity, cooling and shielding.
Date: March 28, 1996
Creator: Krivosheev, O.E.; Mokhov, N.V. & Striganov, S.I.
Partner: UNT Libraries Government Documents Department

Estimates of dispersive effects in a bent NLC Main Linac

Description: An alternative being considered for the Next Linear Collider (NLC) is not to tunnel in a straight line but to bend the Main Linac into an arc so as to follow a gravitational equipotential. The authors begin here an examination of the effects that this would have on vertical dispersion, with its attendant consequences on synchrotron radiation and emittance growth by looking at two scenarios: a gentle continuous bending of the beam to follow an equipotential surface, and an introduction of sharp bends at a few sites in the linac so as to reduce the maximum sagitta produced.
Date: October 31, 2000
Creator: Michelotti, Michael Syphers and Leo
Partner: UNT Libraries Government Documents Department

Future prospects for muon facilities

Description: The motivation, prospects, and R and D plans for future high-intensity muon facilities are described, with an emphasis on neutrino factories. The additional R and D needed for muon colliders is also considered.
Date: August 28, 2000
Creator: Geer, Steve
Partner: UNT Libraries Government Documents Department

Quantum Suppression of beamstrahlung for future linearcolliders

Description: Beamstrahhmg at interaction point may present severe lim- itations on linear collider performance. The approach to re- duce this effect adopted for all current designs at 0.5 TeV will become more difficult and less effective at higher en- ergy. We discuss the feasibility of an alternative approach, based on an effect known as quantum suppression of beam- strahlung, for future linear colliders at multi-TeV energy.
Date: June 1, 1998
Creator: Xie, Ming
Partner: UNT Libraries Government Documents Department

New concepts for damping rings

Description: The requirements for very low emittance and short damping time in the damping rings of future linear colliders, naturally lead to very small beta functions and dispersion in the ring arcs. This makes it difficult to make chromatic correction while maintaining good dynamics. We have therefore developed a lattice with very simple arcs (designed to give the best product of emittance and damping time), and with separate chromatic correction in a dedicated section. The chromatic correction is achieved using a series of non-interleaved sextupole pairs. The performance of such a solution is comparable to that of current damping ring designs, while there are a number of potential advantages.
Date: May 30, 2002
Creator: Raimondi, P. & Wolski, A.
Partner: UNT Libraries Government Documents Department

LHC Symposium 2003: Summary Talk

Description: This summary talk reviews the LHC 2003 Symposium, focusing on expectations as we prepare to leap over the current energy frontier into new territory. We may learn from what happened in the two most recent examples of leaping into new energy territory. Quite different scenarios appeared in those two cases. In addition, they review the status of the machine and experiments as reported at the Symposium. Finally, I suggest an attitude which may be most appropriate as they look forward to the opportunities anticipated for the first data from the LHC.
Date: August 12, 2003
Creator: Appel, Jeffrey A.
Partner: UNT Libraries Government Documents Department