Dr. Jens Knobloch

Educational background Work experience Computer skills Language skills Invited Presentations Scholarships and awards Selected publications

Education 

Cornell University, Laboratory of Nuclear Studies, Ithaca, NY
Doctor of Philosophy Degree in Physics: August, 1997. (Dissertation)
Master of Science Degree in Physics: January, 1993.

Imperial College of Science, Technology and Medicine, London, England
Bachelor of Science Degree in Physics: August, 1990, with First Class Honors.
Associateship of the Royal College of Science: August, 1990, with First Class Honors.

• Specialized Coursework included Communication Physics, Semiconductor Devices, Modern Optics, Astrophysics, Plasma Physics, Solid State Physics and Maching.

Work Experience 

Cornell University, Laboratory of Nuclear Studies, Ithaca, NY
Senior Research Associate: July, 1997 - present
• Assist with the Phase III upgrade of the Cornell Electron Storage Ring (CESR).
• Supervise graduate students and undergraduate co-op students.
• Field emission studies.
Graduate Research Assistant: June, 1991 - July, 1997
Thesis research. Topic: Advanced Thermometry Studies of Superconducting RF Cavities
Demonstrated a proficiency in a wide variety of disciplines, including accelerator physics, superconductivity, cryogenics, microwave engineering, computational physics, vacuum technology, electron microscopy, surface analysis, clean room practices, furnace purification, and chemical polishing.
• Designed and built an experimental apparatus for thermometric studies of 1.5 GHz superconducting microwave cavities during operation in superfluid helium. This system has been adopted by the DESY laboratory (Germany) for similar studies.
• Coordinated related construction work by in-house staff and outside manufacturers.
• Studied electron field emitters and other defects in superconducting microwave cavities. Located field emitters by thermometry and examined these using SEM and EDX analyses.
• Wrote software in LabVIEW for extensive data acquisition, reduction and analysis.
• Theoretical studies included computer simulations of field emitters in cavities using a specially modified version of the particle-in-cell code "MASK" in collaboration with SAIC.
• Support work for the phase III upgrade of CESR.
• Cryotested a scale model of the CESR superconducting microwave cavity for feasibility studies.
• Participated in the first CESR beam test of the full scale 500 MHz superconducting cavity.
• Supervised and advised undergraduate interns and co-op students in the research group.
Cornell University, Department of Physics, Ithaca, NY
Laboratory Teaching Assistant: Spring, 1994 and Fall, 1994
• Instructed physics laboratory classes for 20 honor students.
• Evaluated and graded laboratory reports.
Graduate Teaching Assistant: August, 1990 - May, 1991
• Taught physics recitation and laboratory classes to sophomore and junior level students.
• Tutored students one-on-one and graded homework assignments and exams.
Siemens A.G., Research Department, Erlangen, Germany
Research Assistant: Summer, 1990
• Participated in setting up an experiment on infrared laser amplification.
University of Delaware, Department of Physics and Astronomy, Newark, DE
Undergraduate Research Assistant: Summer, 1989
• Assisted with sapphire anvil cell high pressure experiments.
• Performed pressure calibrations in sapphire anvil cells using ruby fluorescence.
Shores of St. Andrew Camp, New London, MN
Camp Counselor: Summer, 1987
• Supervised 15 campers (ages 6 to 18 and mentally retarded adults) for a week at a time.
• Led discussion groups on ethics, social issues, etc.
• Taught classes on water safety and outdoor activities.
AEG, Finance Department, Frankfurt, Germany
Computer Programmer: Summer, 1986
• Wrote programs for sales data manipulation/reduction and presentation.
• Evaluation of sales data using spreadsheet software.

Computer Skills 

Languages: FORTRAN, C, BASIC, LabVIEW.
OS: UNIX, Macintosh, Windows.
Hardware: GPIB, National Instruments SCXI & NB-MIO.
Software: MASK, MathCAD, ClarisCAD, Excel, Kaleidagraph, LaTeX, MS Word.

Language Skills 

Bicultural American and German (hold both citizenships). Resided in the U.S., Germany and England and attended American, German and British schools. Proficient in French.

Invited Presentations 

9th Workshop on RF Superconductivity: Santa Fe, NM, November, 1999
Presentation on the anomalous Q slope in superconducting microwave cavities.

1998 Applied Superconductivity Conference: Palm Desert, CA, September, 1998
Presentation on high-field limits of superconducting microwave cavities.

8th Workshop on RF Superconductivity: Padova, Italy, October, 1997
Presentation on explosive rf processing and discharge in field emission loaded microwave cavities.

7th Workshop on RF Superconductivity: Gif-sur-Yvette, France, October, 1995
Presentation on thermometric field emission studies in superconducting microwave cavities.

US-CERN-Japan Accelerator School: Maui, Hawaii, November, 1994
Co-taught a course on superconducting microwave cavities.

Scholarships and Awards 

Siemens A.G., Erlangen, Germany, 1990
Scholarship from the Siemens "Auslandsstudentenkreis" (foreign students association).

Royal College of Science (Imperial College), London, England, 1990
Tyndall Prize for laboratory physics.

Publications 

High-field Q slope in superconducting cavities due to magnetic field enhancement at grain boundaries, Proc. of the 9th Workshop on RF Superconductivity, Santa Fe, NM (1999).

Field Emission and Thermal Breakdown in Superconducting Niobium Cavities for Accelerators, IEEE Transactions on Applied Superconductivity 9 (2), 1016 (1999). (PDF file, Postscript file)

The nature of field emission from microparticles and the ensuing voltage breakdown, H. Padamsee and J. Knobloch, High Energy Density Microwaves, edited by R. M. Phillips, AIP Conference Proceedings 474, 212 (American Institute of Physics, Woodbury, NY, 1999). (PDF file, Postscript file)

RF Superconductivity for Accelerators, with H. Padamsee and T. Hays, (Wiley & Sons, New York, 1998).

Explosive Field Emitter Processing in Superconducting RF Cavities, with H. Padamsee, Part. Accel. 61, 169 (1998). Also published in the Proc. of the 8th Workshop on RF Superconductivity, Padova, Italy (1997). (PDF file, Postscript file)

Advanced Thermometry Studies of Superconducting RF Cavities, Jens Knobloch, Ph.D. thesis, Cornell University, August 1997. CLNS thesis 97-3.

Microscopic Investigation of Field Emitters Located by Thermometry in 1.5 GHz Superconducting Niobium Cavities, with H. Padamsee, Part. Accel. 53, 53 (1996). Also published in the Proc. of the 7th Workshop on RF Superconductivity, Gif-sur-Yvette, France, 95 (1995). (PDF file, Postscript file)

Microscopic Examination of Field Emitters Located by Thermometry in 1.5 GHz Superconducting Cavities, with R. Durand, H. Muller and H. Padamsee, Proc. of the 1995 Particle Accelerator Conference, Dallas, TX, 1623 (1995). (PDF file, Postscript file)

Issues in Superconducting RF Technology, with H. Padamsee, Frontiers of Accelerator Technology: Proc. of the US-CERN-Japan Accelerator School, (World Scientific Publishing, Singapore, 1996).

Design of a High Speed, High Resolution Thermometry System for 1.5 GHz Superconducting Radio Frequency Cavities, with H. Muller and H. Padamsee, Rev. Sci. Inst. 65 (11), 3521 (1994). (PDF file, Postscript file)