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The CEBAF Frequency Distribution System

Description: The RF system for the CEBAF accelerator requires that two frequencies, 70.000 and 499.000 MHz, be distributed throughout the accelerator site. Proper operation of the multipass beam requires an energy spread of less than 2.5 {times} 10{sup {minus}5}. This imposes stringent constraints on the allowed slow phase error, in turn implying that there must be active regulation of the phase of the distributed reference frequencies. There are several methods already in use that regulate the phase of a d… more
Date: May 1, 1991
Creator: Krycuk, Anton; Mahoney, Kelly & Simrock, Stefan
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Partner: UNT Libraries Government Documents Department
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Calibration and Operation Schemes for CEBAF RF Control

Description: The RF control system for the CEBAF accelerator uses calibration tables to calibrate and linearize critical components in the RF control modules. This includes compensation for temperature drifts. Calibration data are stored in nonvolatile RAM on the CPU board in the control module. Algorithms for calibration of components like the vector modulator for the phase reference and the gradient detector are described. The calibration will be performed in a dedicated test stand which will be completel… more
Date: September 1, 1990
Creator: Ashkenazi, I.; Hovater, J.; Fugitt, Jock; Mahoney, Kelly & Simrock, Stefan
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Helium Sensitivity in Oxygen Deficiency Measurement Equipment

Description: Most accelerators in operation today use liquid helium based superconducting technology in some capacity. Many of these facilities also use fixed and portable oxygen monitors to detect an oxygen deficient atmosphere were the helium to be accidentally released. When released, helium can expand 800 times its liquid volume. Recent helium spill tests at the Thomas Jefferson National Accelerator Facility (Jefferson Lab) uncovered a fundamental flaw in certain types of oxygen deficiency monitoring eq… more
Date: June 1, 2001
Creator: Mahoney, Kelly; Hutton, Andrew; Robertson, H.; Arenius, D. & Curry, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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