712132 SzGeCERN 20160704105712.0 oai:cds.cern.ch:712132 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN DOI 10.1103/PhysRevLett.93.014801 CERN annual report 2004-3.0185 SPIRES 5835569 Inspire 647143 CERN-AB-2004-012-ABP eng CERN Library AB-2004-012 GSI-ACC-NOTE-2004-02-001 LBNL-54594 SLAC-PUB-10350 Cimino, R LNF-INFN, Frascati CERN AUTHOR|(CDS)2084568 #BEARD# Can low energy electrons affect high energy physics accelerators? 2004 Darmstadt GSI 11 Feb 2004 5 p paper revised version submitted on 2004-05-24 16:09:18 The properties of the electrons participating in the build up of an electron cloud (EC) inside the beam-pipe have become an increasingly important issue for present and future accelerators whose performance may be limited by this effect. The EC formation and evolution are determined by the wall-surface properties of the accelerator vacuum chamber. Thus, the accurate modeling of these surface properties is an indispensible input to simulation codes aimed at the correct prediction of build-up thresholds, electron-induced instability or EC heat load. In this letter, we present the results of surface measurements performed on a prototype of the beam screen adopted for the Large Hadron Collider (LHC), which presently is under construction at CERN. We have measured the total secondary electron yield (SEY) as well as the related energy distribution curves (EDC) of the secondary electrons as a function of incident electron energy. Attention has been paid, for the first time in this context, to the probability at which low-energy electrons (< 20 eV) impacting on the wall create secondaries or are elastically reflected. It is shown that the ratio of reflected to true-secondary electrons increases for decreasing energy and that the SEY approaches unity in the limit of zero primary electron energy. CERN EDS SIS INSP2004 8021981 SIS:2004 PR/LKR added CERN-AB SzGeCERN Particle Physics - Theory INSPEC high energy physics accelerators INSPEC low energy electrons effect INSPEC electron cloud buildup INSPEC beam pipe INSPEC wall surface properties INSPEC buildup thresholds INSPEC electron induced instability INSPEC heat load INSPEC beam screen INSPEC Large Hadron Collider INSPEC total secondary electron yield INSPEC energy distribution curves INSPEC incident electron energy INSPEC vacuum chamber INSPEC beam induced electron multipacting INSPEC bunch electric field INSPEC elastic electron reflection INSPEC memory effects ARTICLE CERN INSPEC A2921 (Beams in particle accelerators) INSPEC A2925F (Beam handling, focusing, pulsing, stripping and diagnostics) INSPEC A2920D (Storage rings) INSPEC A2920L (Synchrotrons) INSPEC colliding-beam-accelerators INSPEC particle-beam-bunching INSPEC particle-beam- stability INSPEC secondary-electron-emission INSPEC storage-rings INSPEC synchrotrons Collins, I R CERN Furman, M A LBNL, Berkeley Pivi, M SLAC Stanford Ruggiero, F CERN Rumolo, Giovanni GSI, Darmstadt AUTHOR|(CDS)2069325 #BEARD# Zimmermann, Frank CERN AUTHOR|(CDS)2067941 #BEARD# AB 014801/1-4 1 Phys. Rev. Lett. 93 2004 CERN Depot 4, bldg. 500-S-023 (DE4) CERN-AB-2004-012-ABP http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=aps&id=PhysRevLett.93.014801 APS Published version, local copy http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2004-012 Access to fulltext document http://cds.cern.ch/record/712132/files/PhysRevLett.93.014801.pdf APS Published version, local copy http://cds.cern.ch/record/712132/files/ab-2004-012.pdf Access to fulltext document juliette.thomashausen@cern.ch n 200410 a2004 13 20100901 1606 CER01 20040218 PUBLIC 0001 002426638CER ARTICLE 709915 SzGeCERN 20180317014512.0 oai:cds.cern.ch:709915 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN Inspire 646720 CERN-AB-2004-010-ABP eng CERN Library AB-2004-010 ATF-2003-08 Wolski, A Closed orbit response to quadruple strength variation 2004 Geneva CERN 12 Jan 2004 14 p paper We derive two formulae relating the variation in closed orbit in a storage ring to variations in quadrupole strength, neglecting nonlinear and dispersive effects. These formulae correct results previously reported [1,2,3]. We compare the results of the formulae applied to the ATF with simulations using MAD, and consider their application to beam-based alignment. CERN EDS CERN-AB SzGeCERN Particle Physics - Theory CERN PREPRINT XX XX Zimmermann, Frank AUTHOR|(CDS)2067941 #BEARD# AB CERN Depot 4, bldg. 500-S-023 (DE4) CERN-AB-2004-010-ABP http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2004-010 Access to fulltext document http://cds.cern.ch/record/709915/files/ab-2004-010.pdf Access to fulltext document http://cds.cern.ch/record/709915/files/ab-2004-010.ps.gz Access to fulltext document juliette.thomashausen@cern.ch CERN LBNL n 200408 11 20100608 1158 CER01 20040206 PUBLIC 002424609CER PREPRINT 0001 736926 SzGeCERN 20170112153708.0 oai:cds.cern.ch:736926 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2004-011-ABP eng CERN Library AB-2004-011 Zimmermann, Frank AUTHOR|(CDS)2067941 #BEARD# Contributions to the 30th Advanced ICFA Beam Dynamics Workshop on High Luminosity e+e- Collisions "FACTORIES'03" SLAC, Stanford, 13-16 October 2003 2004 Geneva CERN 2004 34 p Only contributions but not the proceedings Contributions to the 30th Advanced ICFA Beam Dynamics Workshop on High Luminosity e+e- Collisions " FACTORIES 03", SLAC, Stanford, 13-16 October 2003. Contents: 1.Summary of the Working Group on IR Design, Beam-Beam Interaction and Optics (F. Zimmermann) 2. Brief Review of Super-Bunches for Hadron Colliders (F. Zimmermann) 3. Raimond-Seryi Final Focus for e+e- Factories? (F. Zimmermann) 4. Weak-Strong Model for the Combined Effect of Beam-Beam Interaction and Electron Cloud (F. Zimmermann) 5. Compensating Parasitic Collisions Using Electromagnetic Lenses (J.-P. Koutchouk, J. Wenninger, F. Zimmermann) CERN EDS CERN-AB SzGeCERN Particle Physics - Theory CERN PREPRINT XX XX Koutchouk, Jean-Pierre Wenninger, J AB 30th Advanced ICFA Beam Dynamics Workshop http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2004-011 Access to fulltext document http://cds.cern.ch/record/736926/files/ab-2004-011.pdf Access to fulltext document http://cds.cern.ch/record/736926/files/ab-2004-011.ps.gz Access to fulltext document juliette.thomashausen@cern.ch CERN n 200312 11 20100608 1158 CER01 20040524 609928 stanford20031013 PUBLIC 002449151CER PREPRINT ConferencePaper 728895 SzGeCERN 20241025034304.0 CLINOT ARTICLE ConferencePaper Braun, Hans Heinrich CERN Korostelev, M S CERN CERN-AB-2004-017-ABP CLIC Not applicable CERN ARTICLE 002441646CER juliette.thomashausen@cern.ch We estimate the potential of various non-standard schemes for producing low-emittance electron/positron beams in a linear collider and compare their projected performance with that achieved by the present design of the CLIC damping ring. The options considered include the use of rf-wigglers and the integration of radiation damping into the linac CC-BY publication JACoW CERN EDS CLIC-Note OA SIS APAC04-2006 SIS:2006 PR/LKR added CERN-AB CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings n 200415 a2006 revised version submitted on 2004-06-03 16:55:34 CLIC-Note-594 Zimmermann, Frank CERN AUTHOR|(CDS)2067941 #BEARD# Geneva CERN 30 Mar 2004 4 p paper Potential of non-standard emittance damping schemes for linear colliders oai:cds.cern.ch:728895 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 5852986 Inspire 648557 2004 AB CERN Depot 4, bldg. 500-S-023 (DE4) CERN-AB-2004-017-ABP https://accelconf.web.cern.ch/a04/PAPERS/TUP11012.PDF Published version from JACoW 9431 276584 http://cds.cern.ch/record/728895/files/ab-2004-017.pdf Access to fulltext document eng CERN Library CLIC-Note-0594 CERN Library AB-2004-017 0001 13 20100901 1606 CER01 20040406 964383 306 gyeongju20040322 PUBLIC 720354 SzGeCERN 20160629003332.0 oai:cds.cern.ch:720354 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 5635705 CERN-AB-2004-015-ABP eng CERN Library AB-2004-015 Zimmermann, Frank CERN AUTHOR|(CDS)2067941 #BEARD# Resistive-wall wake and impedance for non-ultrarelativistic beams 2004 Geneva CERN 18 Feb 2004 14 p paper revised version number 1 submitted on 2004-03-04 11:00:17 The usual formulae for the resistive-wall wake field are derived considering ultra-relativistic beams, travelling at the speed of light. This simplifies the calculation, and it leads to a cancellation between electric and magnetic fields. However, for proton beams below 10 GeV and for many heavy ion beams, the velocities may significantly differ from the speed of light. In this paper, we compute the longitudinal and transverse wake fields for velocities smaller than c, and examine under which conditions non-relativistic effects become important. We illustrate our results by a few examples. CC-BY-3.0 Publication CERN EDS CERN-AB UNCL SzGeCERN Accelerators and Storage Rings ARTICLE CERN Oide, K AB 044201 Phys. Rev. Spec. Top. Accel. Beams 7 2004 CERN Depot 4, bldg. 500-S-023 (DE4) CERN-AB-2004-015-ABP http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2004-015 Access to fulltext document http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=aps&id=PhysRevSTAB.7.044201 APS Published version, local copy http://cds.cern.ch/record/720354/files/PhysRevSTAB.7.044201.pdf APS Published version, local copy http://cds.cern.ch/record/720354/files/ab-2004-015.pdf Access to fulltext document http://cds.cern.ch/record/720354/files/ab-2004-015.ps.gz Access to fulltext document juliette.thomashausen@cern.ch KEK, Japan n 200410 a2005 13 20100901 1606 CER01 20040226 PUBLIC 002433578CER ARTICLE 0001 732073 SzGeCERN 20160704111813.0 oai:cds.cern.ch:732073 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2004-018-ABP eng CERN Library AB-2004-018 FERMILAB-BEAMS-DOC-1111 Zimmermann, Frank CERN AUTHOR|(CDS)2067941 #BEARD# Study of Long-range Collisions and Wire Compensation for Tevatron Run-II 2004 Geneva CERN 15 Mar 2004 14 p paper revised version submitted on 2004-05-06 15:38:25 This report summarizes studies of long-range collisions and their compensation by current carrying wires for the Tevatron Run-II, which were performed during a two-week stay at Fermilab, February 22 to March 8, 2004. The weak-strong code WSDIFF was significantly extended to simulate the actual long-range encounters at the Tevatron for different antiproton bunches in the train at injection and in collision. Tune footprints and diffusive apertures simulated by this code are presented for various cases, differing in the bunch position, the energy, the number of long-range and head-on collisions, the presence of additional compensating wires and the momentum deviation. It is confirmed that the solution of 4 wires for injection, previously found by B. Erdelyi, raises the dynamic aperture, by about 1.0-1.5sigma. For both injection and collision an ideal compensation of the 6 or 3 closest long-range encounters was modeled, by removing these collisions altogether. At collision, an improvement in the dynamic aperture of the order of 0.5-1.0sigma is found. The much more copious residual long-range collisions are shown to also strongly affect the diffusive aperture, however, which highlights a lack of correlation between dynamic aperture and tune footprints. The dynamic aperture widely varies with the bunch number, ranging from 5 to 8sigma; along the train, in collision for on-momentum particles. Analytical calculations of tune shift, coupling, chromaticity and chromatic coupling similarly reveal a large variation from bunch to bunch, amounting to 16 units in chromaticity and 4 or 5 units in chromatic coupling. Achieving compensation for all bunches in the train appears a nontrivial challenge for dc wires, in particular if off-energy is also to be corrected. In a machine study on March 1, the Tevatron electron lens was used to simulate a wire and the dependences of beam lifetime, tune, emittances and bunch length on the beam-TEL distance were explored. The results of this experiment are reported elsewhere [1]. CERN EDS CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN PREPRINT XX XX Sen, T Erdelyi, B Boocha, V AB CERN Depot 4, bldg. 500-S-023 (DE4) CERN-AB-2004-018-ABP http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2004-018 Access to fulltext document http://cds.cern.ch/record/732073/files/ab-2004-018.pdf Access to fulltext document juliette.thomashausen@cern.ch Fermilab n 200420 11 20100608 1158 CER01 20040428 PUBLIC 002444831CER PREPRINT 0001