NDLI: Low Dispersion Notch Filter for Multi-GHz Frequencies Using Fiber Optics Delays

Content Provider	IEEE Xplore Digital Library
Author	Simpson, J. D. Konecny, R.
Copyright Year	1963
Abstract	Although their designs appear simple and straightforward, notch filters for application in stochastic cooling systems are frequently difficult to construct with acceptable characteristics. Problems arise because the components are less than perfect, coaxial cables have loss plus dispersion and other necessary hardware has limitations. Usually it is the delay line, typically a high quality coaxial line, which is the source of most problems. Filter configurations have been produced in many styles. Their purpose is to provide a transmission coefficient with (nearly) zeroes at harmonically related frequencies over a large bandwidth. Specifics of the notch shape (and thus the phase) depend upon the particular filter design. Low dispersion of the notch distribution, that is, the deviation of notch frequencies from ideal, is often difficult to achieve. This is especially true as the operating bandwidths of cooling systems expand. The stochastic cooling systemns used in FNAL's TEV-I operate in the 12 and 2-4 GHz bands, but future systems at CERN'S ACOL or even an upgraded TEV-I will extend to 8 GHz. A filter developed at FNAL1 solves the dispersion problem by using a small superconducting coaxial cable as the long delay element. Laboratory measurements of its characteristics indicate it to have excellent parameters. Nevertheless it requires substantial support in the way of cryogenic and control equipment for its operation. This f ilter is the one chosen for use in the initial operation of the TeV-I pbar accumulation system.
Sponsorship	IEEE Nuclear and Plasma Sciences Society Computer Applications in Nuclear and Plasma Sciences (CANPS) Lawrence Berkeley Lab. Lawrence Livermore Nat. Lab. APS College of William and Mary Continuous Electron Beam Accelerator Facility NASA Defence Nuclear Agency Sandia National Laboratories Jet Propulsion Laboratory Brookhaven Nat. Lab. Lawrence Livermore Nat. Lab IEEE/NPPS Radiat. Effects Committee Defence Nuclear Agency/DoD Sandia National Laboratories/DOE Jet Propulsion Laboratory/NASA Phillips Lab./DoD
Starting Page	2129
Ending Page	2131
Page Count	3
File Size	1109548
File Format	PDF
ISSN	00189499
Volume Number	32
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1985-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical fiber filters Frequency Optical fibers Delay Cooling Stochastic systems Coaxial cables Bandwidth Superconducting filters Optical losses
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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