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Your search keyword '"F. DeJongh"' showing total 3 results
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3 results on '"F. DeJongh"'

1. SuperCDMS Detector Readout Cryogenic Hardware

Author

C. N. Bailey, K. Clark, J. Hall, N. Mirabolfathi, Laura Baudis, Tarek Saab, L. Hsu, H. N. Nelson, R. Bunker, Jeffrey P. Filippini, P. L. Brink, R. W. Schnee, S. A. Hertel, Steven W. Leman, P. Cushman, Sunil Golwala, L. Duong, J. Cooley, D. S. Akerib, L. Novak, D. Homgren, Martin E. Huber, X. Qiu, E. J. Ramberg, M. Kos, D. N. Seitz, P. Wikus, Bernard Sadoulet, D. Balakishiyeva, David Moore, Z. Ahmed, Enectali Figueroa-Feliciano, O. Kamaev, M. Pyle, S. J. Yellin, R. Hennings-Yeomans, Darren Grant, G. Wang, T. Bruch, Bruno Serfass, Astrid Tomada, Blas Cabrera, Betty A. Young, J. Beaty, K. M. Sundqvist, A. Reisetter, J. Sander, D. A. Bauer, Matthew Fritts, Vuk Mandic, R. W. Ogburn, J. Yoo, R. Mahapatra, M. Kiveni, S. Arrenberg, Kevin A. McCarthy, F. DeJongh, W. Rau, M. R. Dragowsky, D. O. Caldwell, Cabrera, B., Miller, A., and Young, B. A.

Subjects
Cryostat, Physics, Physics::Instrumentation and Detectors, business.industry, Amplifier, Detector, Bolometer, law.invention, High impedance, Thermal conductivity, Parasitic capacitance, law, Microphonics, Optoelectronics, business
Abstract

SuperCDMS employs 1‐inch thick germanium crystals operated below 50mK in a dilution cryostat. Each detector produces ionization and phonon signals. Ionization signals are amplified by JFETs operating at 150K within an assembly mounted on the 4K cryostat stage. These high impedance signals are carried to the FETs by superconducting “vacuum coaxes” which minimize thermal conductivity, stray capacitance, and microphonics. Transition edge sensors produce low‐impedance phonon signals, amplified by SQUID arrays mounted on a 600mK stage. Detectors are mounted in a six‐sided wiring configuration called a “tower”, which carries signals from 40mK to 4K. A flex circuit 3 meters in length carries amplified signals for each detector from 4K to a vacuum bulkhead. We describe the methods used to support the detectors, wiring and amplifier elements at various thermal stages, minimizing electrical noise and thermal loads.

Published
2009

2. The Cryogenic Dark Matter Search (CDMS) : Present Status and Future

Author

P. L. Brink, Z. Ahmed, D. S. Akerib, C. N. Bailey, D. Balakishiyeva, D. A. Bauer, J. Beaty, R. Bunker, B. Cabrera, D. O. Caldwell, J. Cooley, E. do Couto e Silva, P. Cushman, F. DeJongh, M. R. Dragowsky, L. Duong, E. Figueroa-Feliciano, J. Filippini, M. Fritts, S. R. Golwala, D. R. Grant, J. Hall, R. Hennings-Yeomans, S. Hertel, A. Hojem, D. Holmgren, L. Hsu, M. E. Huber, O. Kamaev, M. Kos, M. Kiveni, S. W. Leman, R. Mahapatra, V. Mandic, K. A. McCarthy, D. Moore, N. Mirabolfathi, H. Nelson, L. Novak, R. W. Ogburn, M. Pyle, X. Qiu, E. Ramberg, W. Rau, A. Reisetter, T. Saab, B. Sadoulet, J. Sander, R. Schmitt, R. W. Schnee, D. N. Seitz, B. Serfass, K. M. Sundqvist, A. Tomada, G. Wang, P. Wikus, S. Yellin, J. Yoo, B. A. Young, Marvin L. Marshak, and Marshak, M. L.

Subjects
Physics, Particle physics, Upgrade, WIMP, Weakly interacting massive particles, Dark matter, Detector, Cryogenic Dark Matter Search
Abstract

The CDMS collaboration utilizes Ge detectors for their Weakly Interacting Massive Particle (WIMP) search at the Soudan mine, Minnesota. The final data run of CDMS II is complete and a detector upgrade for SuperCDMS has commenced. A SuperTower of five 1‐inch thick Ge crystals has been installed and undergoing commissioning. Its surface‐event rejection capability should allow SuperCDMS to continue to run background free for the next proposed phases: 15 kg Ge deployment at Soudan, and up to 150 kg Ge deployment at SNOLAB. Recent detector advances to allow a 1 tonne Ge experiment are also discussed.

Published
2009

3. Resonant substructure in K−π+π+π− and K̄0π+π+π− decays of charmed D mesons

Author

F. DeJongh

Subjects
Physics, Nuclear physics, Particle decay, Pion, Meson, Branching fraction, Hadron, Substructure, Elementary particle, Atomic physics, Boson
Abstract

We measure the resonant substructure of D0→K−π+π+π− and D+→K0π+π+π− decays using a five‐dimensional maximum likelihood technique to extract the relative fractions and phases of the amplitudes contributing to these final states. We obtain preliminary branching ratios of several decay modes including B(D0→K−a+1)=.080±.008±.019, B(D+→K0a+1)=.081±.020±.027, and B(D0→K*0ρ0)=.023±.003±.007. The branching ratio for D0→K*0ρ0 is smaller than theoretically expected and the K*0 and ρ0 are found to be polarized in the direction of their motion as seen from the D0 frame.

Published
1989

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