J. W. Kooi, V. Ossenkopf,
"HIFI Differential Instrument Stability, as measured during Check Out Phase",
11 September 2009.

J. W. Kooi, V. Ossenkopf,
"HIFI System Stability Performance Check Out Phase",
10 September 2009.

J. W. Kooi, V. Ossenkopf,
"HIFI Frequency Switch Performance Check Out Phase",
09 September 2009.

J. W. Kooi, V. Ossenkopf, M. Olberg, R. Shipman, R. Schieder,
"HIFI Instrument Stability, as measured during the ITL phase",
29 November 2007.

J. W. Kooi, V. Ossenkopf, M. Olberg, R. Shipman, R. Schieder,
"HIFI System Stability at Selected Line Frequencies, as measured during the ILT-3 phase",
01 November 2007.

Journal Articles

J. W. Kooi, R. A. Chamberlin, R. Monje, A. Kovacs, F. Rice, H. Yoshida, B. Force, K. Cooper, D. Miller, M. Gould, D. Lis, B. Bumble, R. LeDuc, J. A. Stern, and T. G. Phillips,
"Performance of the Caltech Submillimeter Observatory Dual-Color 180-720~GHz Balanced SIS Receivers",
IEEE Terahertz Science and Technology, Vol. xx, Issue xx, pp.xx-xx, xx., 2014.

J. W. Kooi, R. A. Chamberlin, R. Monje, B. Force, D. Miller, and T. G. Phillips,
"Balanced Receiver Technology Development for the Caltech Submillimeter Observatory",
IEEE Terahertz Science and Technology, Vol. 2, Issue 1, pp.71-82, Jan., 2012.

F. P. Mena, J. W. Kooi, A. M. Baryshev, C. F. J. Lodewijk, T. Zijlstra, R. Hesper, G. Gerlofsma, T. M. Klapwijk, and W. Wild,
"Design and Performance of a 600-720 GHz Sideband-Separating Receiver using AlOx and AlN SIS Junctions.",
IEEE Transactions on Microwave Theory and Techniques, Vol. 59, Issue: 1, pp. 166-177, Jan., 2011.

Th. de Graauw, F. P. Helmich, T. G. Phillips, J. Stutzki, E. Caux, N. D. Whyborn, P. Dieleman, P. R. Roelfsema, H. Aarts, R. Assendorp, R. Bachiller, W. Baechtold, A. Barcia, D. A. Beintema, V. Belitsky, A. O. Benz, R. Bieber, A. Boogert, C. Borys, B. Bumble, P. Caďs, M. Caris, P. Cerulli-Irelli1, G. Chattopadhyay, S. Cherednichenko , M. Ciechanowicz, O. Coeur-Joly, C. Comito, A. Cros, A. de Jonge, G. de Lange, B. Delforges, Y. Delorme, T. den Boggende, J.-M. Desbat, C. Diez-González, A. M. Di Giorgio, L. Dubbeldam, K. Edwards, M. Eggens, N. Erickson, J. Evers1, M. Fich, T. Finn, B. Franke5, T. Gaier, C. Gal, J. R. Gao, J.-D. Gallego, S. Gauffre, J. J. Gill, S. Glenz, H. Golstein, H. Goulooze, T. Gunsing, R. Güsten, P. Hartogh,W. A. Hatch, R. Higgins, E. C. Honingh, R. Huisman, B. D. Jackson, H. Jacobs, K. Jacobs, C. Jarchow, H. Javadi, W. Jellema, M. Justen, A. Karpov, C. Kasemann, J. Kawamura, G. Keizer, D. Kester, T. M. Klapwijk, Th. Klein, E. Kollberg, J. W. Kooi, P.-P. Kooiman, B. Kopf, M. Krause, J.-M. Krieg, C.Kramer, B. Kruizenga, T. Kuhn, W. Laauwen, R. Lai, B. Larsson, H. G. Leduc, C. Leinz, R. H. Lin, R. Liseau, G. S. Liu, A. Loose, I. López-Fernandez , S. Lord, W. Luinge, A. Marston, J. Martín-Pintado30, A. Maestrini12, F. W.Maiwald, C. McCoey, I. Mehdi, A. Megej, M. Melchior, L. Meinsma, H.Merkel, M. Michalska, C. Monstein, D. Moratschke, P. Morris, H. Muller, J. A. Murphy, A. Naber, E. Natale, W. Nowosielski, F. Nuzzolo, M. Olberg, M. Olbrich, R. Orfei1, P. Orleanski, V. Ossenkopf, T. Peacock, J. C. Pearson, I. Peron, S. Phillip-May, L. Piazzo, P. Planesas, M. Rataj, L. Ravera, C. Risacher, M. Salez, L. A. Samoska, P. Saraceno, R. Schieder, E. Schlecht, F. Schlöder, F. Schmülling, M. Schultz, K. Schuster, O. Siebertz, H. Smit, R. Szczerba, R. Shipman, E. Steinmetz, J. A. Stern1, M. Stokroos, R. Teipen, D. Teyssier, T. Tils, N. Trappe, C. van Baaren, B.-J. van Leeuwen, H. van de Stadt, H. Visser, K. J.Wildeman, C. K. Wafelbakker, J. S. Ward, P.Wesselius, W. Wild, S.Wulff, H.-J.Wunsch, X. Tielens, P. Zaal, H. Zirath, J. Zmuidzinas, and F. Zwart,
"The Herschel-Heterodyne Instrument for the Far-Infrared (HIFI)",
A&A, Vol. 518, L6, 2010.

J. W. Kooi, A. Kovacs, M. C. Sumner, G. Chattopadhyay, R. Ceria, D. Miller, B. Bumble, R. LeDuc, J. A. Stern, and T. G. Phillips,
"A 275-425 GHz Tunerless Waveguide Receiver Based on AlN SIS Technology",
IEEE Transactions on Microwave Theory and Techniques, Vol. 55, No. 10, pp. 2086-2096, October 2007.

J. W. Kooi, J. J. A. Baselmans, J. R. Gao, T. M. Klapwijk, M. Hajenius, P. Dieleman, A. Baryshev, and G. de Lange,
"IF Impedance and Mixer Gain of NbN Hot-Electron Bolometers",
Journal of Applied Physics, Vol. 101, 044511, Feb. 2007.

J.W. Kooi, J.J.A. Baselmans, A. Baryshev, R. Schieder, M. Hajenius, J.R. Gao, T.M. Klapwijk, B. Voronov, and G. Gol'tsman,
"Stabilty of Heterodyne Terahertz Receivers",
Journal of Applied Physics, Vol. 100, 064904, Sept. 2006.

B.D. Jackson, G. de Lange, T. Zijlstra, M. Kroug, J. W. Kooi, J. A. Stern, and T. M. Klapwijk
"Low-Noise 0.8-0.96 and 0.96-1.12 THz Superconductor-Insulator-Superconductor Mixers for the Herschel Space Observatory",
IEEE Transactions on Microwave Theory and Techniques, Vol. 54, No. 2, pp. 547-558, February, 2006.

J.W. Kooi, G. Chattopadhyay, S. Withington, F. Rice, J. Zmuidzinas, C. K. Walker, and G. Yassin
"A Full-Height Waveguide to Thin-Film Microstrip Transition with Exceptional RF Bandwidth and Coupling Efficiency",
Int J. IR and MM Waves,, Vol. 24, No. 3, Sept, 2003.

J. R. Pardo, J. Cernicharo, F. Herpin, J. Kawamura, J. W. Kooi, and T. G. Phillips
"Deuterium Enhancement in Water toward Orion IRc2 Deduced from HDO Lines above 800 GHz",
Astrophyscial Journal, 562:799-803, Dec., 2001.

Stark, A. A., Bally, J., Balm, S. P., Bania, T. M., Bolatto, A. D., Chamberlin, R. A., Engargiola, G., Huang, M., Ingalls, J. G., Jacobs, K.,
Jackson, J. M., Kooi, J. W., Lane, A. P., Lo, K.-Y., Marks, R. D., Martin, C. L., Mumma, D.,
Ojha, R., Staguhn, J., Stutzki, J., Walker, C. K., Wilson, R. W., Wright, G. A., Zhang, X., Zimmermann, P., and Zimmermann,
"The Antarctic Submillimeter Telescope and Remote Observatory (AST/RO)",
Publications of the Astronomical Society of the Pacific, 113, p. 567-585, 2001.

J.W. Kooi, J. Kawamura, J. Chen, G. Chattopadhyay, J. R. Pardo, J. Zmuidzinas, T.G. Phillips, B. Bumble, J. Stern, and H.G. LeDuc,
"A Low Noise NbTiN-based 850 GHz SIS Receiver for the Caltech Submillimeter Observatory",
Int J. IR and MM Waves,, Vol. 21, No. 9, Sept, 2000.

J.W. Kooi, G. Chattopadhyay, M. Thielman, T.G. Phillips, and R. Schieder,
"Noise Stability of SIS Receivers",
Int J. IR and MM Waves,, Vol. 21, No. 5, May, 2000.

Kawamura, J., Chen, J., Miller, D., Kooi, J. , Zmuidzinas, J., Bumble, B., LeDuc, H. G., and Stern, J.A.,
"Low-noise Submillimeter-wave NbTiN Superconducting Tunnel Junction Mixers,",
Applied Physics Letters, 75, 4013-4015, 1999.

J.W. Kooi, J.A. Stern, G. Chattopadhyay, H.G. LeDuc, B.Bumble, and J. Zuidzinas,
"Low Loss NbTiN Films for THz SIS Mixer Tuning Circuits" ,
Int J. IR and MM Waves,, Vol. 19, No. 3, March, 1998.

J.W. Kooi, J. Pety, B. Bumble, C.K. Walker, H.G. LeDuc P.L. Schaffer, and T.G. Phillips,
"A 850 GHz Waveguide Receiver Employing a Niobium SIS Junction Fabricated on a 1µm Si3N4 Membrane",
IEEE Transactions on Microwave Theory and Techniques, Vol. 46, No. 2, pp151-161, February 1998

Jocelyn Keene, Peter Schilke, J.W. Kooi, D. C. Lis, David M. Mehringer, and T. G. Phillips.
"Detection of the ^3P_2 - ^3P_1 Submillimeter Transition of 13CI in the Interstellar Medium: Implication for Chemical Fractionation",
Astrophysics, astro-ph/9712071. 4 Dec. 1997.

J.W. Kooi, M.S. Chan, M. Bin, B. Bumble, H.G. Leduc, C.K. Walker, and T.G. Phillips,
"The Development of an 850 GHz Waveguide Receiver using Tuned SIS Junctions on 1µm Si3N4 Membranes,"
Int. J. IR and MM Waves, Vol. 16, No.2, pp 349-362, Feb. 1995

J. W. Kooi, M. Chan, B. Bumble, H. G. Leduc, P.L. Schaffer, and T. G. Phillips,
"230 and 492 GHz Low-Noise SIS Waveguide Receivers Employing Tuned Nb/AlOx/Nb Tunnel Junctions," ,
Int. J. IR and MM Waves, Vol. 16, No. 12, pp. 2049-2068, Dec. 1995.

J.W. Kooi, C.K. Walker, H.G. LeDuc, T.R. Hunter, D.J. Benford, and T.G. Phillips,
"A Low Noise 665 GHz SIS Quasi-Particle Waveguide Receiver," ,
Int J. IR and MM Waves, Vol. 15, No. 3, 477-492, 1994.

J. W. Kooi , M. Chan, B. Bumble, and T. G. Phillips,
"A Low Noise 345 GHz Waveguide Receiver Employing a tuned 0.50 µm² Nb/AlOx/Nb Tunnel Junction" ,
Int. J. IR and MM Waves, Vol. 15, No. 5, May 1994.

C. K. Walker, J. W. Kooi, M. Chan, H. G. Leduc, P.L. Schaffer, J.E. Carlstrom, and T.G. Phillips,
"A Low-noise 500 GHz SIS Waveguide Receiver",
Int. J. IR and MM Waves, Vol. 13, pp. 785-798, June 1992.

J.W. Kooi, M. Chan, T.G. Phillips, B. Bumble, and H.G. Leduc,
"A Low Noise 230 GHz Heterodyne Receiver Employing a 0.25 µm² Area Nb/AlOx/Nb Tunnel Junction" ,
IEEE trans. Microwaves Theory and Techniques, Vol. 40, No. 5, pp. 812-815, May 1992.

Conferences Proceedings Top

A. Khudchenko, R. Hesper, A. Baryshev, G. Gerlofma, P. Mena, T. Zijlstra, T. Klapwijk, M. Spaans, J. W. Kooi,
"Sideband Separating Mixer for 600-720 GHz",
Proc. of SPIE Vol. 7854-98, 2010.

R. D. Higgens, J. W. Kooi,
"Electrical standing waves in the HIFI HEB mixer amplifier chain",
Proc. of SPIE Vol. 7215 72150L-10, Terahertz Technology and Applications II, edited by Kurt J. Linden, Laurence P. Sadwick, Créidhe M. M. O'Sullivan, 2009.

J. W. Kooi,
"Heterodyne Receiver Development at the Caltech Submillimeter Observatory",
Submillimeter Astrophysics and Technology: A Symposium Honoring Thomas G. Phillips,
Editors: D. C. Lis, J. E. Vaillancourt, P. F. Goldsmith, T. A. Bell, N. Z. Scoville, and J. Zmuidzinas, ASP Conference Series, Vol. CS-417, Pasadena, Ca., 2010.

B. Billade, V. Belitsky, A. Pavolotsky, I. Lapkin, J. W. Kooi,
"ALMA Band 5 (163-211 GHz) Sideband Separation Mixer",
Twentieth International Symposium on Space Terahertz Technology, Charlottesville, 20-22 April, 2009.

C. Groppi, C. Walker, C. Kulesa, D. Golish, J. Kloosterman, S. Weinreb, G. Jones, J. Barden, H. Mani, T. Kuiper, J. W. Kooi, A. Lichtenberger, T. Cecil, G. Narayanan, P. Pütz, Abby Hedden,
"SuperCam: A 64 pixel heterodyne array receiver for the 350 GHz Atmospheric Window",
Twentieth International Symposium on Space Terahertz Technology, Charlottesville, 20-22 April, 2009.

J. W. Kooi, V. Ossenkopf, M. Olberg, R. Shipman, R. Schieder, and D. Teyssier,
"HIFI Stability as Measured During ILT Phase",
Nineteenth International Symposium on Space Terahertz Technology, Groningen, 28-30 April, 2008.

C. Groppi, C. Walker, C. Kulesa, D. Golish, J. Kloosterman, P. Pütz, S. Weinreb, T. Kuiper, J. W. Kooi, G. Jones, J. Bardin, H. Mani, A. Lichtenberger, T. Cecil, A. Hedden, and G. Narayanan,
"Large Format Heterodyne Arrays for Terahertz Astronomy",
Nineteenth International Symposium on Space Terahertz Technology, Groningen, 28-30 April, 2008.

A. M. Datesman, J. C. Schultz, A. W. Lichtenberger, D. Golish, C. K. Walker, and J. W. Kooi,
"Fabrication and Characterization of Niobium Diffusion-Cooled Hot-Electron Bolometers on Silicon Nitride Membranes",
Applied Superconductivity Conference Jacksonville, FL, October, 2004

J. W. Kooi, A. Kovacs, B. Bumble, G. Chattopadhyay, M. L. Edgar, S. Kaye, R. LeDuc, J. Zmuidzinas, and T. G. Phillips
"Heterodyne Instrumentation Upgrade at the Caltech Submillimeter Observatory II",
Proceedings International Society of Optical Engineers, 21-25 June, 2004 Glasgow, Scotland United Kingdom.

T. Berg, S. Cherednichenko, V. Drakinskiy, P. Khosropanah, H. Merkel, E. Kollberg, and J. W. Kooi,
"Stability of HEB receivers at THz frequencies",
Proceedings International Society of Optical Engineers, 21-25 June, 2004 Glasgow, Scotland United Kingdom.

J. W. Kooi, R. Schieder, J. Baselmans, M. Hajenius, A. Baryshev, R. Hesper
"Regarding Atmospheric and Mechanical Stability Requirements of (LO-Pumped) Mixers",
Fifteenth International Symposium on Space Terahertz Technology, April 27-29, Massachusetts 2004.

R.B. Bass, A.W. Lichtenberger, R. Weikle, J.W. Kooi, C.K. Walker, S.-K. Pan,
"“Ultra-Thin SOI Beam Lead Chips forSuperconducting Terahertz Circuit",
Proceedings of the 6th European Conference on Applied Superconductivity, Sorento, Italy, September 14, 2003

Groppi, C., Walker, C., Kulesa, C., Narayanan, G., Jacobs, K., Graf, U., Schieder, R., and Kooi, J. W. ,
``Heterodyne Array Development at the University of Arizona'',
Proceedings of the 14th International Symposium on Space Terahertz Technology, eds. C. Walker and J. Payne, pp. 189-203, 2003.

R.B. Bass, J.C. Schultz, A.W. Lichtenberger, C. Walker, and J.W. Kooi,
"“Beam Lead Fabrication Using Vacuu Planarization",
Proceedings Fourteenth International Symposium on Space THz Technology, Tucson, AZ, April 2003.

Walker, C. K., Groppi, C., Drouet d'Aubigny, C., Kulesa, C., Hedden, A., Prober, D., Siddiqi, I., Kooi, J. W. , Chen, G., and Lichtenberger, A. W.
"Integrated Heterodyne Array Receivers for Submillimeter Astronomy",
Proceedings of SPIE, Astronomical Telescopes and Instrumentation, v. 4855, 2002

J.W. Kooi, A. Kovac, S. Kaye, J. Dama, J. Zmuidzinas, and T.G. Phillips
"Heterodyne Instrumentation Upgrade at the Caltech Submmillimeter Observatory",
Proceedings International Society of Optical Engineers, Kona, Hawaii, August 2002.

Stark, A. A., Lane, A. P., Martin, C. L., Chamberlin, R. A., Kooi, J. W., and Walker, C. K.
"Terahertz Initiatives at the Antarctic Submillimeter Telescope and Remote Observatory (AST/RO)",
Proceedings of the Thirteenth Intern. Symp. on Space THz Technology, eds. R. Blundell and E. Tong, (Harvard Univ., Cambridge, MA), 26-28 Mar. 2002, pp. 133-142.

J.W. Kooi, C.K. Walker, and J. Hesler
"A Broad Bandwidth Suspended Membrane Waveguide to Thinfilm Microstrip Transition",
9th Int. Conference on Teraherz Electronics, 15th - 16th October 2001.

Walker, C. K., Groppi, C., Golish, D., Kulesa, C., Hungerford, A., Drouet d'Aubigny, C., Jacobs, K., Graf, U., Martin, C., and Kooi, J. W.,
"PoleSTAR: An 810 GHz Array Receiver for AST/RO",
Proceedings of the Twelfth Intern. Symp. on Space THz Technology, ed. I. Medhi, (San Diego, CA), pp. 540-552.

J.W. Kooi, F. Rice, G. Chattopadhyay, S. Sundarum, S. Weinreb and T.G Phillips,
"Regarding the IF Output Conductance of SIS Tunnel Junctions and the Integration with Cryogenic InP MMIC Amplifiers",
10th International Symposium on Space Terahertz Technology, University of Virginia, Virginia, March, 1999.

D. J. benford, M.C. Gaidis, J.W. Kooi,
"Transmission Properties of ZITEX in IR-Submm",
Proc. 10th International Symposium on Space Terahertz Technology, 402, 1999

J. A. Stern, B. Bumble, H.G. Leduc, J. W. Kooi, and J. Zmuidzinas,
"Fabrication and DC-Characterization of NbTiN Based SIS Mixers for Use between 600 and 1200 GHz"
Proc. 10th Int. Symp. on Space Terahertz Tech. pp 305-313, 1999

J.W. Kooi, P.L. Schaffer, B. Bumble, R. LeDuc, and T.G. Phillips
"Heterodyne Instrumentation at the CSO",
Proceedings International Society of Optical Engineers, Kona, Hawaii, March 1998.

J. Zmuidzinas, J. W. Kooi, , J. Kawamura, G. Chattopadhyay, B. Bumble, H. G. LeDuc, and J. A. Stern,
"Development of SIS mixers for 1 THz",
Proc. SPIE, vol. 3357, pp. 53-61, 1998

D. J. benford,J.W. Kooi, and E. Serabyn,
"Spectroscopic Measurements of Optical Components around 1 THz",
9th International Symposium on Space Terahertz Technology, Pasadena, California, March, 1998.

J.A. Stern, B. Bumble, H.G. LeDuc, J.W. Kooi, J. Zmuidzinas,
"Fabrication and DC-Characterization of NbTiN Based SIS Mixers for the Use between 600 and 1200 GHz".
Ninth International Symposium on Space Terahertz Technology, Pasadena, California, March 1998.

J.W. Kooi,
"Cryogenic Low Noise Balanced IF Amplifiers",
(Memo) July 1998.

J.W. Kooi,
"CSO Sidecab Optics, Problems and Solutions",
(Memo) July 1998.

J. A. Stern, B. Bumble, H.G. Leduc, J.W. Kooi, and J. Zmuidzinas,
"Fabrication and DC-Characterization of NbTiN Based SIS Mixers for Use between 600 and 1200 GHz,"
Proc. 10th Int. Symp. on Space Terahertz Tech. pp 305-313, 1999

J.W. Kooi, M.S. Chan, H.G. Leduc, and T.G. Phillips,
"A 665 GHz Waveguide Receiver Using a Tuned 0.5µm² Nb/AlOx/Nb Tunnel Junction",
Seventh International Symposium on Space Terahertz Technology, Charlottesville, Virginia, March 1996.

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