Author
M.J. Lamm
Bio: M.J. Lamm is an academic researcher from Fermilab. The author has contributed to research in topics: Superconducting magnet & Magnet. The author has an hindex of 23, co-authored 221 publications receiving 2415 citations.
Papers published on a yearly basis
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TL;DR: The 2011 Workshop on Fundamental Physics at the Intensity Frontier as discussed by the authors identified and described opportunities at the intensity frontier in the areas of heavy quarks, charged leptons, neutrinos, proton decay, new light weakly-coupled particles, and nucleons, nuclei, and atoms.
Abstract: The Proceedings of the 2011 workshop on Fundamental Physics at the Intensity Frontier. Science opportunities at the intensity frontier are identified and described in the areas of heavy quarks, charged leptons, neutrinos, proton decay, new light weakly-coupled particles, and nucleons, nuclei, and atoms.
157 citations
Posted Content•
TL;DR: The Mu2e experiment at Fermilab will search for charged lepton flavor violation via the coherent conversion process with a sensitivity approximately four orders of magnitude better than the current world's best limits for this process.
Abstract: Author(s): Project, The Mu2e; Collaboration; Abrams, RJ; Alezander, D; Ambrosio, G; Andreev, N; Ankenbrandt, CM; Asner, DM; Arnold, D; Artikov, A; Barnes, E; Bartoszek, L; Bernstein, RH; Biery, K; Biliyar, V; Bonicalzi, R; Bossert, R; Bowden, M; Brandt, J; Brown, DN; Budagov, J; Buehler, M; Burov, A; Carcagno, R; Carey, RM; Carosi, R; Cascella, M; Cauz, D; Cervelli, F; Chandra, A; Chang, JK; Cheng, C; Ciambrone, P; Coleman, RN; Cooper, M; Corcoran, MC; Cordelli, M; Davydov, Y; Gouvea, AL de; Lorenzis, L De; Debevec, PT; DeJongh, F; Densham, C; Deuerling, G; Dey, J; Falco, S Di; Dixon, S; Djilkibaev, R; Drendel, B; Dukes, EC; Dychkant, A; Echenard, B; Ehrlich, R; Evans, N; Evbota, D; Fang, I; Fast, JE; Feher, S; Fischler, M; Frank, M; Frlez, E; Fung, SS; Gallo, G; Galucci, G; Gaponenko, A; Genser, K; Giovannella, S; Glagolev, V; Glenzinski, D; Gnani, D; Goadhouse, S; Gollin, GD; Grace, C; Grancagnolo, F; Group, C; Hanson, J; Hanson, S; Happacher, F; Heckmaier, E; Hedin, D; Hertzog, DW; Hirosky, R; Hitlin, DG; Ho, E; Huang, X | Abstract: Mu2e at Fermilab will search for charged lepton flavor violation via the coherent conversion process mu- N --g e- N with a sensitivity approximately four orders of magnitude better than the current world's best limits for this process. The experiment's sensitivity offers discovery potential over a wide array of new physics models and probes mass scales well beyond the reach of the LHC. We describe herein the conceptual design of the proposed Mu2e experiment. This document was created in partial fulfillment of the requirements necessary to obtain DOE CD-1 approval, which was granted July 11, 2012.
114 citations
TL;DR: Fermilab developed and investigated different high-field magnets (HFM) for present and future accelerators as discussed by the authors, including a series of 1-m long cos-theta dipole models based on the wind-and-react technique was fabricated and tested.
Abstract: Fermilab is developing and investigating different high-field magnets (HFM) for present and future accelerators. The HFM R&D program focused on the 10-12 T magnets based on Nb/sub 3/Sn superconductor and explored both basic magnet technologies for brittle superconductors-wind-and-react and react-and-wind. Magnet design studies in support of LHC upgrades and VLHC were conducted. A series of 1-m long cos-theta dipole models based on the wind-and-react technique was fabricated and tested. Three 1-m long flat racetracks and the common coil dipole model, based on a single-layer coil and react-and-wind technique, were also fabricated and tested. Extensive theoretical and experimental studies of electro-magnetic instabilities in Nb/sub 3/Sn strands, cables and magnets were performed and led to a successful 10 T dipole model. This paper presents the details of Fermilab's HFM program, reports its status and major results, and formulates the next steps for the program.
52 citations
TL;DR: In this article, the alignment of high-gradient superconducting quadrupole magnets is performed using a single stretched wire system with very long wire lengths, up to 20 m.
Abstract: High-gradient superconducting quadrupole magnets are being developed by the US LHC Accelerator Project for the Interaction Regions of the Large Hadron Collider. Determination of the magnetic axis for alignment of these magnets will be performed using a single stretched wire system. These measurements will be done both at room and cryogenic temperatures with very long wire lengths, up to 20 m. This paper reports on the stretched wire alignment methodology to be employed: and the results of recent room-temperature measurements on a 2 m model magnet with long wire lengths.
51 citations
TL;DR: In this article, a shell-based key and bladder technology (TQS) was used to test six Nb3Sn superconducting quadrupole magnets for the Large Hadron Collider luminosity upgrade.
Abstract: Amongst the magnet development program of a large-aperture Nb3Sn superconducting quadrupole for the Large Hadron Collider luminosity upgrade, six quadrupole magnets were built and tested using a shell based key and bladder technology (TQS). The 1 m long 90 mm aperture magnets are part of the US LHC Accelerator Research Program (LARP) aimed at demonstrating Nb3Sn technology by the year 2009, of a 3.6 m long magnet capable of achieving 200 T/m. In support of the LARP program the TQS magnets were tested at three different laboratories, LBNL, FNAL and CERN and while at CERN a technology-transfer and a four days magnet disassembly and reassembly were included. This paper summarizes the fabrication, assembly, cool-down and test results of the six magnets and compares measurements with design expectations.
50 citations
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TL;DR: In this article, a comprehensive review of physics effects generated by leptoquarks (LQs), i.e., hypothetical particles that can turn quarks into leptons and vice versa, of either scalar or vector nature, is presented.
464 citations
TL;DR: In this article, the authors review recent progress in the phenomenology of RH neutrinos and discuss the mass ranges suggested by hints for neutrino oscillation anomalies and DR (eV), sterile NE DM scenarios (keV) and experimentally testable theories of baryogenesis (GeV to TeV).
Abstract: Neutrinos are the only particles in the Standard Model (SM) of particle physics that have only been observed with left handed chirality to date. If right handed (RH) neutrinos exist, they could be responsible for several phenomena that have no explanation within the SM, including neutrino oscillations, the baryon asymmetry of the universe, dark matter (DM) and dark radiation (DR). After a pedagogical introduction, we review recent progress in the phenomenology of RH neutrinos. We in particular discuss the mass ranges suggested by hints for neutrino oscillation anomalies and DR (eV), sterile neutrino DM scenarios (keV) and experimentally testable theories of baryogenesis (GeV to TeV). We summarize constraints from theoretical considerations, laboratory experiments, astrophysics and cosmology for each of these.
365 citations
TL;DR: In this paper, the authors calculate the production of a massive vector boson by quantum fluctuations during inflation and show that the vector inherits the usual adiabatic, nearly scale-invariant perturbations of the inflaton, allowing it to be a good dark matter candidate.
Abstract: We calculate the production of a massive vector boson by quantum fluctuations during inflation. This gives a novel dark-matter production mechanism quite distinct from misalignment or thermal production. While scalars and tensors are typically produced with a nearly scale-invariant spectrum, surprisingly the vector is produced with a power spectrum peaked at intermediate wavelengths. Thus dangerous, long-wavelength, isocurvature perturbations are suppressed. Further, at long wavelengths the vector inherits the usual adiabatic, nearly scale-invariant perturbations of the inflaton, allowing it to be a good dark-matter candidate. The final abundance can be calculated precisely from the mass and the Hubble scale of inflation, ${H}_{I}$. Saturating the dark-matter abundance we find a prediction for the mass $m\ensuremath{\approx}{10}^{\ensuremath{-}5}\text{ }\text{ }\mathrm{eV}\ifmmode\times\else\texttimes\fi{}\phantom{\rule{0ex}{0ex}}({10}^{14}\text{ }\text{ }\mathrm{GeV}/{H}_{I}{)}^{4}$. High-scale inflation, potentially observable in the cosmic microwave background, motivates an exciting mass range for recently proposed direct-detection experiments for hidden photon dark matter. Such experiments may be able to reconstruct the distinctive, peaked power spectrum, verifying that the dark matter was produced by quantum fluctuations during inflation and providing a direct measurement of the scale of inflation. Thus a detection would not only be the discovery of dark matter, it would also provide an unexpected probe of inflation itself.
357 citations
TL;DR: In this article, the authors overview the current status of τ physics, highlighting the most recent developments, and discuss the prospects for future improvements, as well as discuss the potential of future improvements.
307 citations
TL;DR: In this article, a global fit of the Minimal Unitarity Violation (MUV) scheme parameters to the present experimental data is performed, which yields the up-to-date constraints on leptonic non-unitarity.
Abstract: The non-unitarity of the effective leptonic mixing matrix at low energies is a generic signal of extensions of the Standard Model (SM) with extra fermionic singlet particles, i.e. “sterile” or “right-handed” neutrinos, to account for the observed neutrino masses. The low energy effects of such extensions can be described in a model-independent way by the Minimal Unitarity Violation (MUV) scheme, an effective field theory extension of the SM. We perform a global fit of the MUV scheme parameters to the present experimental data, which yields the up-to-date constraints on leptonic non-unitarity. Furthermore, we investigate the sensitivities and discovery prospects of future experiments. In particular, FCC-ee/TLEP would be a powerful probe of flavour-conserving non-unitarity for singlet masses up to ∼60 TeV. Regarding flavour-violating non-unitarity, future experiments on muon-to-electron conversion in nuclei could even probe extensions with singlet masses up to ∼0.3 PeV.
299 citations