Superconducting delay line for stochastic cooling filters

Conference · Mon Aug 01 00:00:00 EDT 1983 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:7059240

Kuchnir, M; McCarthy, J D; Pasquinelli, R J

The stochastic cooling system of the antiproton source at Fermilab uses notch filters for reducing the feedback power at frequencies corresponding to particles in the core. At the same time these filters assist in shaping the gain vs. momentum in the stack tail. These filters, therefore, must attenuate all the harmonics of the revolution frequency (629 kHz) in the operating frequency band (1-2 GHz). They require components providing delays of 1.59 microseconds with a minimum of attenuation and undesirable distortion in this passband. Transmission lines providing such delays are typically 328 m long, have a rather large diameter, and are fabricated from a high conductivity material to keep the attenuation sufficiently low. The use of superconductors allows a dramatic reduction in the diameter, total size, and cost of this component in spite of the added cryogenic requirements. The authors measured the performance of two such cables in order to demonstrate the feasibility of the superconducting cable-notch filter concept. The first cable is an 84 m long superconducting coax consisting of a solid Niobium inner conductor inside a teflon dielectric, a lead outer conductor, and an outer jacket of mylar tape. The second cable is a 1.0 km long coaxial line with an inner conductor of lead-plated copper wire, a FEP teflon dielectric, and an outer conductor of leadplated copper tape wrapped with mylar. This paper discusses the results of performance testing of both cables and assesses their compatibilities with notch filters.

• Research Organization: Fermi Nat.'l Accelerator Lab., P.O. Box 500, Batavia, IL 60510
• OSTI ID: 7059240
• Report Number(s): CONF-830311-
• Journal Information: IEEE Trans. Nucl. Sci.; (United States), Vol. NS-30:4; Conference: Particle accelerator conference, Santa Fe, NM, USA, 21 Mar 1983
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
FERMILAB ACCELERATOR
COOLING SYSTEMS
SUPERCONDUCTING CABLES
DESIGN
TIMING PROPERTIES
ANTIPROTON BEAMS
COAXIAL CABLES
COMPATIBILITY
COPPER
DATA TRANSMISSION SYSTEMS
DIELECTRIC MATERIALS
FEEDBACK
FILTERS
LEAD
MYLAR
NIOBIUM
PARTICLE SOURCES
STOCHASTIC COOLING
SUPERCONDUCTORS
TEFLON
ACCELERATORS
ANTINUCLEON BEAMS
ANTIPARTICLE BEAMS
BEAM COOLING
BEAMS
CABLES
CONDUCTOR DEVICES
CYCLIC ACCELERATORS
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
ELEMENTS
ENERGY SYSTEMS
EQUIPMENT
ESTERS
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
MATERIALS
METALS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYESTERS
POLYETHYLENES
POLYMERS
POLYOLEFINS
POLYTETRAFLUOROETHYLENE
RADIATION SOURCES
SYNCHROTRONS
SYNTHETIC MATERIALS
TRANSITION ELEMENTS
430303* - Particle Accelerators- Experimental Facilities & Equipment
420201 - Engineering- Cryogenic Equipment & Devices