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Author Hsiao, F.Z.; Lin, M.C.; Wang, C.; Lee, D.S.; Chen, J.R.; Hilbert, B.; Praud, A.
Title The liquid helium cryogenic system for the superconducting cavity in SRRC Type Conference Article
Year 2001 Publication Proc. Particle Accelerator Conference Abbreviated Journal
Volume 2 Issue Pages (up) 1604-1606
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Abstract A 500 MHz superconducting cavity will replace the current copper cavity and begin to operate in the beginning of the year 2003. A liquid helium cryogenic system provides the cavity at 4.5 K a cooling capacity of 255 W without LN2 pre-cooling and a liquefaction rate of 110 liter/hour with LN2 pre-cooling. A safety factor of 1.5 is used to estimate the heat load from the superconducting cavity and the heat loss from the transfer lines. With the LN2 pre-cooling, this cooling system provides a cooling capacity of up to 450 W to cool down the additional superconducting Landau cavity. The capacity of the system can be tuned using a frequency driver installed at the compressor station. The pressure fluctuations of the dewar and of the suction line are kept to the same stability requirement that of the cavity cryostat to minimize the influence in cavity operation. A shutdown period for maintenance of more than 8000 hours for the cryogenic system is expected without interfering with the continuous operation of the superconducting cavity.
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Call Number RPLAB @ s @ Serial 426
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Author Kasparek, W; Fernandez, A.; Hollmann, F; Wacker, R.
Title Measurements of ohmic losses of metallic reflectors at 140 GHz using a 3-mirror resonator technique Type Journal Article
Year 2001 Publication Int. J. Infrared and Millimeter Waves Abbreviated Journal
Volume 22 Issue 11 Pages (up) 1695-1707
Keywords mirror, reflection index, emissivity, Fabry-Perot interferometer, subterahertz, subTHz
Abstract The reflectivity of metallic mirrors in the millimeter wave region does not only depend on the material, but also on the structure and roughness of the surface. We have performed measurements of the reflectivity of various plane and grooved metallic and graphite samples at 140 GHz. The technique is based on the comparison of the quality factor of a 2-mirror reference resonator with the quality factor of a 3-mirror resonator which has identical dimensions and includes the mirror to be tested. After a brief presentation of the theory, the set-up is described and the reflection loss for various aluminium and copper mirrors as well as vacuum compatible materials for applications in thermonuclear fusion experiments are presented and discussed.
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Call Number Serial 581
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Author Gershenson, M. E.; Gong, D.; Sato, T.; Karasik, B. S.; Sergeev, A. V.
Title Millisecond electron-phonon relaxation in ultrathin disordered metal films at millikelvin temperatures Type Journal Article
Year 2001 Publication Appl. Phys. Lett. Abbreviated Journal
Volume 79 Issue Pages (up) 2049-2051
Keywords HEB detector, FIR, far infrared
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Call Number RPLAB @ s @ heb_eph_interaction_Gershenzon Serial 315
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Author Zwiller, Vale<cc><81>ry; Blom, Hans; Jonsson, Per; Panev, Nikolay; Jeppesen, Sören; Tsegaye, Tedros; Goobar, Edgard; Pistol, Mats-Erik; Samuelson, Lars; Björk, Gunnar
Title Single quantum dots emit single photons at a time: Antibunching experiments Type Journal Article
Year 2001 Publication Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.
Volume 78 Issue 17 Pages (up) 2476
Keywords antibunching, quantum dot
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ISSN 0003-6951 ISBN Medium
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Call Number Serial 502
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Author Ganzevles, W. F. M.; Gao, J. R.; de Korte, P. A. J.; Klapwijk, T. M.
Title Direct response of microstrip line coupled Nb THz hot-electron bolometer mixers Type Journal Article
Year 2001 Publication Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.
Volume 79 Issue 15 Pages (up) 2483-2485
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ISSN 0003-6951 ISBN Medium
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Notes Approved no
Call Number Serial 311
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