PAC 2005 - List of Authors

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

McCormick, D.J.

Paper	Title	Page
TPPP033	Cavity Alignment Using Beam Induced Higher Order Modes Signals in the TTF Linac	2284
	M.C. Ross, J.C. Frisch, K.E. Hacker, R.M. Jones, D.J. McCormick, C.L. O'Connell, T.J. Smith SLAC, Menlo Park, California N. Baboi, M.W. Wendt DESY, Hamburg O. Napoly, R. Paparella CEA/DSM/DAPNIA, Gif-sur-Yvette
	Funding: DE-AC02-76SF00515. Each nine cell superconducting accelerator cavity in the TESLA Test Facility (TTF) at DESY* has two higher order mode (HOM) couplers that efficiently remove the HOM power.** They can also provide useful diagnostic signals. The most interesting modes are in the first 2 cavity dipole passbands. They are easy to identify and their amplitude depends linearly on the beam offset from the cavity axis making them excellent beam position monitors (BPM). By steering the beam through an eight-cavity cryomodule, we can use the HOM signals to estimate internal residual alignment errors and minimize wakefield related beam emittance growth. We built and commissioned a four channel heterodyne receiver and time-domain based waveform recorder system that captures information from each mode in these two bands on each beam pulse. In this paper we present an experimental study of the single-bunch generated HOM signals at the TTF linac including estimates of cavity alignment precision and HOM BPM resolution. P. Piot, DESY-TESLA-FEL-2002-08. *R. Brinkmann et al. (eds.), DESY-2001-011.
ROAC004	High Gradient Performance of NLC/GLC X-Band Accelerating Structures	372
	S. Doebert, C. Adolphsen, G.B. Bowden, D.L. Burke, J. Chan, V.A. Dolgashev, J.C. Frisch, R.K. Jobe, R.M. Jones, R.E. Kirby, J.R. Lewandowski, Z. Li, D.J. McCormick, R.H. Miller, C.D. Nantista, J. Nelson, C. Pearson, M.C. Ross, D.C. Schultz, T.J. Smith, S.G. Tantawi, J.W. Wang SLAC, Menlo Park, California T.T. Arkan, C. Boffo, H. Carter, I.G. Gonin, T.K. Khabiboulline, S.C. Mishra, G. Romanov, N. Solyak Fermilab, Batavia, Illinois Y. Funahashi, H. Hayano, N. Higashi, Y. Higashi, T. Higo, H. Kawamata, T. Kume, Y. Morozumi, K. Takata, T. T. Takatomi, N. Toge, K. Ueno, Y. Watanabe KEK, Ibaraki
	Funding: Work Supported by DOE Contract DE-AC02-76F00515. During the past five years, there has been an concerted effort at FNAL, KEK and SLAC to develop accelerator structures that meet the high gradient performance requirements for the Next Linear Collider (NLC) and Global Linear Collider (GLC) initiatives. The structure that resulted is a 60-cm-long, traveling-wave design with low group velocity (< 4% c) and a 150 degree phase advance per cell. It has an average iris size that produces an acceptable short-range wakefield in the linacs, and dipole mode damping and detuning that adequately suppresses the long-range wakefield. More than eight such structures have operated over 1000 hours at a 60 Hz pulse rate at the design gradient (65 MV/m) and pulse length (400 ns), and have reached breakdown rate levels below the limit for the linear collider. Moreover, the structures are robust in that the breakdown rates continue to decrease over time, and if the structures are briefly exposed to air, the rates recover to their low values within a few days. This paper presents a final summary of the results from this program, which effectively ended last August with the selection of ‘cold’ technology for a next generation linear collider.
RPPP013	Tests of the FONT3 Linear Collider Intra-Train Beam Feedback System at the ATF	1359
	P. Burrows, G.B. Christian, C.C. Clarke, A.F. Hartin, H.D. Khah, S. Molloy, G.R. White Queen Mary University of London, London J.C. Frisch, T.W. Markiewicz, D.J. McCormick, M.C. Ross, S. Smith, T.J. Smith SLAC, Menlo Park, California A. Kalinin CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire C. Perry OXFORDphysics, Oxford, Oxon
	We report preliminary results of beam tests of the FONT3 Linear Collider intra-train position feedback system prototype at the Accelerator Test Facility at KEK. The feedback system incorporates a novel beam position monitor (BPM) processor with a latency below 5 nanoseconds, and a kicker driver amplifier with similar low latency. The 56 nanosecond-long bunchtrain in the ATF extraction line was used to test the prototype with delay-loop feedback operation. The achieved latency represents a demonstration of intra-train feedback on timescales relevant even for the CLIC Linear Collider design.
RPPP036	A Test Facility for the International Linear Collider at SLAC End Station A for Prototypes of Beam Delivery and IR Components	2461
	M. Woods, R.A. Erickson, J.C. Frisch, C. Hast, R.K. Jobe, L. Keller, T.W. Markiewicz, T.V.M. Maruyama, D.J. McCormick, J. Nelson, N. Phinney, T.O. Raubenheimer, M.C. Ross, A. Seryi, S. Smith, Z. Szalata, P. Tenenbaum, M. Woodley SLAC, Menlo Park, California D.A.-K. Angal-Kalinin, C.D. Beard, F.J. Jackson, A. Kalinin CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire R. Arnold University of Massachusetts, Amherst D. Bailey , R.J. Barlow, G.Yu. Kourevlev, A. Mercer UMAN, Manchester S.T. Boogert, A. Liapine, S. Malton, D.J. Miller, M.W. Wing UCL, London P. Burrows, G.B. Christian, C.C. Clarke, A.F. Hartin, S. Molloy, G.R. White Queen Mary University of London, London D. Burton, N. Shales, J. Smith, A. Sopczak, R. Tucker Microwave Research Group, Lancaster University, Lancaster D. Cussans University of Bristol, Bristol C. Densham, J. Greenhalgh CCLRC/DL, Daresbury, Warrington, Cheshire M.H. Hildreth Notre Dame University, Notre Dame, Iowa Y.K. Kolomensky UCB, Berkeley, California W.F.O. Müller, T. Weiland TEMF, Darmstadt N. Sinev, E.T. Torrence University of Oregon, Eugene, Oregon M.S. Slater, M.T. Thomson, D.R. Ward University of Cambridge, Cambridge Y. Sugimoto KEK, Ibaraki S.W. Walston LLNL, Livermore, California N.K. Watson Birmingham University, Birmingham I. Zagorodnov DESY, Hamburg F. Zimmermann CERN, Geneva
	Funding: U.S. Department of Energy. The SLAC Linac can deliver damped bunches with ILC parameters for bunch charge and bunch length to End Station A (ESA). A 10Hz beam at 28.5 GeV energy can be delivered to ESA, parasitic with PEP-II operation. During the engineering design phase for the ILC over the next 5 years, we plan to use this facility to prototype and test key components of the Beam Delivery System (BDS) and Interaction Region (IR). We discuss our plans for this ILC Test Facility and preparations for carrying out experiments related to Collimator Wakefields, Materials Damage Tests and Energy Spectrometers. We also plan an IR Mockup of the region within 5 meters of the ILC Interaction Point to investigate effects from backgrounds and beam rf higher-order modes (HOMs).