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Article
Title	Absolute Current Calibrations of 1$\mu$A CW Electron Beam
Author(s)	Freyberger, A ; Bevins, M E ; Day, A R ; Degtiarenko, P ; Saha, A ; Slachtouski, S
Affiliation	(Jefferson Lab, Newport News, Virginia Rutgers University, The State University of New Jersey, Piscataway, New Jersey)
Publication	2005
In:	7th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators, Lyons, France, 6 - 8 Jun 2005, pp.36
Subject category	Accelerators and Storage Rings
Abstract	The future experimental program at Jefferson Lab requires an absolute current calibration of a 1$\mu\A CW electron beam to better than 1% accuracy. This paper presents the mechanical and electrical design of a Tungsten calorimeter that is being constructed to provide an accurate measurement of the deposited energy. The energy is determined by measuring the change in temperature after beam exposure. Knowledge of the beam energy then yields number of electrons stopped by the calorimeter during the exposure. Simulations show that the energy losses due to electromagnetic and hadronic losses are the dominant uncertainty. Details of the precision thermometry and calibration, mechanical design, thermal simulations and GEANT simulations will be presented.