Jochen Hellmig

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The Cryogenic Dark Matter Search (CDMS) employs Ge and Si detectors to search for weakly interacting massive particles (WIMPs) via their elastic-scattering interactions with nuclei while discriminating against interactions of background particles. CDMS data, accounting for the neutron background, give limits on the spin-independent WIMP-nucleon(More)
There are many applications for non-contact measurement of the displacement and velocity of moving objects, especially when achieved at low cost. An optical displacement sensor has been developed that can be compared to expensive laserinterferometry sensors, however at a cost compatible with requirements for consumer products. This miniature LaserDoppler(More)
VCSEL based sensors can measure distance and velocity in three dimensional space and are already produced in high quantities for professional and consumer applications. Several physical principles are used: VCSELs are applied as infrared illumination for surveillance cameras. High power arrays combined with imaging optics provide a uniform illumination of(More)
D.S. Akerib, J. Alvaro-Dean, M.S. Armel, M.J. Attisha, L. Baudis, D.A. Bauer, A.I. Bolozdynya, P.L. Brink, R. Bunker, B. Cabrera, D.O. Caldwell, J.P. Castle, C.L. Chang, R.M. Clarke, M.B. Crisler, P. Cushman, A.K. Davies, R. Dixon, D.D. Driscoll, L. Duong, J. Emes, R. Ferril, R.J. Gaitskell, S.R. Golwala, M. Haldeman, J. Hellmig, M. Hennessey, D. Holmgren,(More)
Nuclear recoil measurements with high–purity Germanium detectors are very promising to directly detect dark matter candidates. The main background sources in such experiments are natural radioactivity and microphonic noise. Digital pulse shape analysis is an encouraging approach to reduce the background originating from the latter. To study the pulse shapes(More)
Neutrinoless double beta decay (0νββ) is one of the most sensitive approaches to test particle physics beyond the standard model. During the last years, besides the most restrictive limit on the effective Majorana neutrino mass, the analysis of new contributions by the Heidelberg group led to bounds on left-right-symmetric models, leptoquarks and R-parity(More)
Results from the 1998-1999 Runs of the Cryogenic Dark Matter Search R.W. Schnee , D. Abrams, D.S. Akerib, M.S. Armel-Funkhouser, L. Baudis, D.A. Bauer A. Bolozdynya, P.L. Brink, R. Bunker, B. Cabrera, D.O. Caldwell, J.P. Castle, C.L. Chang, R.M. Clarke, M.B. Crisler R. Dixon, D. Driscoll, S. Eichblatt, R.J. Gaitskell, S.R. Golwala, E.E. Haller J. Hellmig,(More)