The CLIC study of a high energy (0.5–5 TeV), high luminosity (1034–1035 cm−2 sec−1) e± linear collider is presented. Beam acceleration using high frequency (30 GHz) normal-conducting structures operating at high accelerating fields (150 MV/m) significantly reduces the length and, in consequence, the cost of the linac. Based on new beam and linac parameters derived from a recently developed set of general scaling laws for linear colliders, the beam stability is shown to be similar to lower frequency designs in spite of the strong wake-field dependency on frequency. The drive beam generation scheme for RF power production by the so-called “Two Beam Acceleration (TBA)” method is described. It uses a thermionic gun and a fully-loaded normal-conducting linac operating at low frequency (937 MHz) to generate and accelerate the drive beam bunches, and RF multiplication by funnelling in compressor rings to produce the desired bunch structure. Recent 30 GHz hardware developments and results from the CLIC Test Facil...
{"title":"A multi-TeV compact e+e− linear collider","authors":"I. Wilson, C. S. Team","doi":"10.1063/1.1394300","DOIUrl":"https://doi.org/10.1063/1.1394300","url":null,"abstract":"The CLIC study of a high energy (0.5–5 TeV), high luminosity (1034–1035 cm−2 sec−1) e± linear collider is presented. Beam acceleration using high frequency (30 GHz) normal-conducting structures operating at high accelerating fields (150 MV/m) significantly reduces the length and, in consequence, the cost of the linac. Based on new beam and linac parameters derived from a recently developed set of general scaling laws for linear colliders, the beam stability is shown to be similar to lower frequency designs in spite of the strong wake-field dependency on frequency. The drive beam generation scheme for RF power production by the so-called “Two Beam Acceleration (TBA)” method is described. It uses a thermionic gun and a fully-loaded normal-conducting linac operating at low frequency (937 MHz) to generate and accelerate the drive beam bunches, and RF multiplication by funnelling in compressor rings to produce the desired bunch structure. Recent 30 GHz hardware developments and results from the CLIC Test Facil...","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"54 17","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120819286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We present an investigation of the use of net charge and kaon identification to tag the flavor of neutral B mesons. The net charge of the neutral B meson decay products is zero if all charged particles are used and slightly non-zero if only undiscriminated hadronic final states are used. The net charge of the kaons alone correctly tags the identity of the neutral meson in at least a third of all decays. We have parametrized the particle identification capability of several techniques, such as dE/dx in time projection chambers, LEP/SLC ring-imaging chambers and an enhanced BaBar DIRC. Using these parametrisations we compare the relative tagging power of each technique to that of an ideal detector.
{"title":"Neutral B meson flavor tagging","authors":"R. Wilson","doi":"10.1063/1.1394447","DOIUrl":"https://doi.org/10.1063/1.1394447","url":null,"abstract":"We present an investigation of the use of net charge and kaon identification to tag the flavor of neutral B mesons. The net charge of the neutral B meson decay products is zero if all charged particles are used and slightly non-zero if only undiscriminated hadronic final states are used. The net charge of the kaons alone correctly tags the identity of the neutral meson in at least a third of all decays. We have parametrized the particle identification capability of several techniques, such as dE/dx in time projection chambers, LEP/SLC ring-imaging chambers and an enhanced BaBar DIRC. Using these parametrisations we compare the relative tagging power of each technique to that of an ideal detector.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122898886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The physics potential is summarized for e+e− linear colliders operating at center-of-mass energies up to s=1 TeV in the first phase, and at multi-TeV energies in the second phase. These machines will be ideal instruments to investigate the mechanisms for the breaking of the electroweak symmetries, the fundamental Higgs mechanism or dynamical alternatives. In supersymmetric theories, the spectrum of new particles and their interactions can be explored comprehensively and with high precision. The mechanism of supersymmetry breaking can be studied experimentally and the underlying fundamental theory can be reconstructed, eventually at scales near the Planck scale where particle physics and gravity are linked. The structure of space and time will be probed at distances down to 10−18 cm in scattering experiments. Precision studies of the electroweak gauge bosons, the top quark and QCD supplement the physics program of these machines.
{"title":"e+e−linear colliders: Theoretical basis and perspectives","authors":"P. Zerwas","doi":"10.1063/1.1394296","DOIUrl":"https://doi.org/10.1063/1.1394296","url":null,"abstract":"The physics potential is summarized for e+e− linear colliders operating at center-of-mass energies up to s=1 TeV in the first phase, and at multi-TeV energies in the second phase. These machines will be ideal instruments to investigate the mechanisms for the breaking of the electroweak symmetries, the fundamental Higgs mechanism or dynamical alternatives. In supersymmetric theories, the spectrum of new particles and their interactions can be explored comprehensively and with high precision. The mechanism of supersymmetry breaking can be studied experimentally and the underlying fundamental theory can be reconstructed, eventually at scales near the Planck scale where particle physics and gravity are linked. The structure of space and time will be probed at distances down to 10−18 cm in scattering experiments. Precision studies of the electroweak gauge bosons, the top quark and QCD supplement the physics program of these machines.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"578 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130456178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Progress is reported on research and development into the technologies and techniques for the construction of a beam profile monitor for a linear collider interaction region. Based upon measuring in detail the copious production of electron-positron pairs through beam-beam interaction, such a pair monitor has been proposed previously. Studies and simulation results are based on the JLC parameter set, but it is believed that this method can be exploited for other linear colliders.
{"title":"Pair monitor for linear collider","authors":"G. Alimonti","doi":"10.1063/1.1394419","DOIUrl":"https://doi.org/10.1063/1.1394419","url":null,"abstract":"Progress is reported on research and development into the technologies and techniques for the construction of a beam profile monitor for a linear collider interaction region. Based upon measuring in detail the copious production of electron-positron pairs through beam-beam interaction, such a pair monitor has been proposed previously. Studies and simulation results are based on the JLC parameter set, but it is believed that this method can be exploited for other linear colliders.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125697628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The next Linear Collider should provide the capability to measure with precision the Higgs branching ratios, constraining the models of electroweak symmetry breaking. The precision of a proposed CCD vertex detector is studied for 120 GeV/c2 and 140 GeV/c2 Higgs production at s=500 GeV.
{"title":"Higgs branching ratio measurements at a future Linear Collider","authors":"J. Brau, C. Potter, M. Iwasaki","doi":"10.1063/1.1394322","DOIUrl":"https://doi.org/10.1063/1.1394322","url":null,"abstract":"The next Linear Collider should provide the capability to measure with precision the Higgs branching ratios, constraining the models of electroweak symmetry breaking. The precision of a proposed CCD vertex detector is studied for 120 GeV/c2 and 140 GeV/c2 Higgs production at s=500 GeV.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128198738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Free electron lasers are now being designed which will operate at wavelengths down to about 1. [1] The physics of the high-gain, single pass FEL process requires extremely bright electron pulses in the 10–20 GeV range. This electron brightness should be achievable using an RF-photocathode source and a linear accelerator, such as the initial acceleration stage of a TeV-range linear electron-positron collider. The x-ray FEL radiation produced will have unique properties. In particular: • The FEL peak intensity and peak brightness will be many orders of magnitude higher than can be produced by any other source. • The pulse length will be less than 1 picosecond, orders of magnitude shorter than can be achieved with any other bright source such as a synchrotron. • The FEL radiation will have full transverse coherence and a degeneracy parameter (photons/coherence volume) equal to 109 or more. No other source can produce hard x-radiation with a degeneracy parameter significantly greater than 1. These properties ...
{"title":"X-ray free-electron lasers: Scientific goals and machine implications","authors":"J. Arthur","doi":"10.1063/1.1394304","DOIUrl":"https://doi.org/10.1063/1.1394304","url":null,"abstract":"Free electron lasers are now being designed which will operate at wavelengths down to about 1. [1] The physics of the high-gain, single pass FEL process requires extremely bright electron pulses in the 10–20 GeV range. This electron brightness should be achievable using an RF-photocathode source and a linear accelerator, such as the initial acceleration stage of a TeV-range linear electron-positron collider. The x-ray FEL radiation produced will have unique properties. In particular: • The FEL peak intensity and peak brightness will be many orders of magnitude higher than can be produced by any other source. • The pulse length will be less than 1 picosecond, orders of magnitude shorter than can be achieved with any other bright source such as a synchrotron. • The FEL radiation will have full transverse coherence and a degeneracy parameter (photons/coherence volume) equal to 109 or more. No other source can produce hard x-radiation with a degeneracy parameter significantly greater than 1. These properties ...","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129199219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. X. Hansen, D. Jackson, R. Hawkings, C. Damerell
The ability to distinguish the flavor of jets formed in an event is a very important parameter to evaluate, when designing a high performance vertex detector to use in a future e+e− linear collider. In this work we concentrate on a CCD (Charged Coupled Device) pixel vertex detector. We first evaluate the basic tracking performance. We then estimate the flavor tagging performance of the present detector layout, using a neural network approach. We conclude by studying the energy dependence of the performance.
{"title":"Flavor tagging studies for a high performance vertex detector","authors":"S. X. Hansen, D. Jackson, R. Hawkings, C. Damerell","doi":"10.1063/1.1394429","DOIUrl":"https://doi.org/10.1063/1.1394429","url":null,"abstract":"The ability to distinguish the flavor of jets formed in an event is a very important parameter to evaluate, when designing a high performance vertex detector to use in a future e+e− linear collider. In this work we concentrate on a CCD (Charged Coupled Device) pixel vertex detector. We first evaluate the basic tracking performance. We then estimate the flavor tagging performance of the present detector layout, using a neural network approach. We conclude by studying the energy dependence of the performance.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133304022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
For some choices of soft SUSY–breaking parameters, the LSP is a stable neutralino χ10, the NLSP is a chargino χ1± almost degenerate in mass with the LSP (Δmχ1≡mχ1±−mχ10∼mπ–few GeV), and all other sparticles are relatively heavy. We discuss the potential of the NLC for studying such models.
{"title":"The degenerate Wino-like chargino-neutralino scenario at a linear collider","authors":"S. Mrenna, J. Gunion","doi":"10.1063/1.1394364","DOIUrl":"https://doi.org/10.1063/1.1394364","url":null,"abstract":"For some choices of soft SUSY–breaking parameters, the LSP is a stable neutralino χ10, the NLSP is a chargino χ1± almost degenerate in mass with the LSP (Δmχ1≡mχ1±−mχ10∼mπ–few GeV), and all other sparticles are relatively heavy. We discuss the potential of the NLC for studying such models.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123237781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Prospects for the study of B physics with a sample of 109 hadronic Z0 decays, produced with a highly polarized electron beam, are discussed. The discussion is based on extrapolations made from current experience at LEP and the SLC, and includes both electroweak coupling measurements as well as the study of CKM parameters via exclusively reconstructed B hadron decays.
{"title":"B Physics with a Giga-Z sample","authors":"B. Schumm","doi":"10.1063/1.1394372","DOIUrl":"https://doi.org/10.1063/1.1394372","url":null,"abstract":"Prospects for the study of B physics with a sample of 109 hadronic Z0 decays, produced with a highly polarized electron beam, are discussed. The discussion is based on extrapolations made from current experience at LEP and the SLC, and includes both electroweak coupling measurements as well as the study of CKM parameters via exclusively reconstructed B hadron decays.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124979310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, we summarize the status of the JLC X-band linac development and ATF (Accelerator Test Facility) activity. The report on the C-band RF system development can be found in Ref. 1.
{"title":"Status of JLC accelerators development","authors":"Y. Chin, T. Higo, J. Urakawa","doi":"10.1063/1.1394299","DOIUrl":"https://doi.org/10.1063/1.1394299","url":null,"abstract":"In this paper, we summarize the status of the JLC X-band linac development and ATF (Accelerator Test Facility) activity. The report on the C-band RF system development can be found in Ref. 1.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121572110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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