Energy Spectra Between 10 and Several Hundred GeV/Nucleon for Elements from _(18)Ar to _(23)V: Results from HEAO-3

We report updates of recently published results on cosmic ray energy spectra of the sub-iron nuclei. This paper is based on the following analysis and improvements : a) a better analysis of the charge resolution of the instrument, b) availability of more recent charge-changing cross sections necessary to correct the abundances for interactions inside the detector, and c) a recent revision of the results from the French-Danish C2 experiment on HEA0-3 that were included in our analysis

Energy dependence of Ti/Fe ratio in the Galactic cosmic rays measured by the ATIC-2 experiment

Titanium is a rare, secondary nucleus among Galactic cosmic rays. Using the Silicon matrix in the ATIC experiment, Titanium has been separated. The energy dependence of the Ti to Fe flux ratio in the energy region from 5 GeV per nucleon to about 500 GeV per nucleon is presented.Comment: 8 pages, 4 figures, accepted for publication in Astronomy Letter

Response of Ionization Chambers and Cherenkov Counters to Relativistic Ultraheavy Nuclei

We have exposed a detector, similar to the one used on the HEAO Heavy Nuclei Experiment {Binns, et al., 1981) to beams of _(26)Fe, _(57)La, _(61)Ho and _(79)Au at the LBL Bevalac. We will report on the deviations from z2 scaling for the signals in the ion chambers and the Cherenkov counters as a function of energy and Z. These deviations are definitely small and imply an error of less than one charge unit in the charge determinations used in the Heavy Nuclei Experiment (Binns, et al., 1989)

The Next Linear Collider Test Accelerator

During the past several years, there has been tremendous progress on the development of the RF system and accelerating structures for a Next Linear Collider (NLC). Developments include high-power klystrons, RF pulse compression systems and damped/detuned accelerator structures to reduce wakefields. In order to integrate these separate development efforts into an actual X-band accelerator capable of accelerating the electron beams necessary for an NLC, we are building an NLC Test Accelerator (NLCTA). The goal of the NLCTA is to bring together all elements of the entire accelerating system by constructing and reliably operating an engineered model of a high-gradient linac suitable for the NLC. The NLCTA will serve as a testbed as the design of the NLC evolves. In addition to testing the RF acceleration system, the NLCTA is designed to address many questions related to the dynamics of the beam during acceleration. In this paper, we will report on the status of the design, component development, and construction of the NLC Test Accelerator

Radiation protection in the NLC Test Accelerator at SLAC

This report describes the ionizing radiation protection and safety issues in the design of the Next Linear Collider Test Accelerator (NLCTA), a high-gradient, 1-GeV, X-band linac at SLAC

STATUS AND RESULTS FROM THE NEXT LINEAR COLLIDER TEST ACCELERATOR *

The design for the Next Linear Collider (NLC) at SLAC is based on two 11.4 GHz linacs operating at an unloaded acceleration gradient of 50 MV/m increasing to 85 MV/m as the energy is increased from 1/2 TeV to 1 TeV in the center of mass[1]. During the past several years there has been tremendous progress on the development of 11.4 GHz (X-band) RF systems. These developments include klystrons which operate at the required power and pulse length, pulse compression systems that achieve a factor of four power multiplication and structures that are specially designed to reduce long-range wakefields. Together with these developments, we have constructed a 1/2 GeV test accelerator, the NLC Test Accelerator (NLCTA). The NLCTA will serve as a test bed as the design of the NLC is refined. In addition to testing the RF system, the NLCTA is designed to address many questions related to the dynamics of the beam during acceleration, in particular the study of multibunch beam loading compensation and transverse beam break-up. In this paper we present the status of the NLCTA and the results of initia