The authors report on the first full scale implementation of a VME based Data Acquisition (DAQ) system at the Stanford Linear Accelerator Center (SLAC). This system was designed for use in the End Station A (ESA) fixed target program. It was designed to handle interrupts at rates up to 120 Hz and event sizes up to 10,000 bytes per interrupt. One of the driving considerations behind the design of this system was to make use of existing CAMAC based electronics and yet deliver a high performance DAQ system. This was achieved by basing the DAQ system in a VME backplane allowing parallel control and readout of CAMAC branches and VME DAQ modules. This system was successfully used in the Spin Physics research program at SLAC (E154 and E155).

Using VME to leverage legacy CAMAC electronics into a high speed data acquisition system

The Spin Muon Collaboration (SMC) has measured for the first time the spin-dependent structure function g: of the deuteron in the deep inelastic scattering of polarized muons on polarized deuterons in the kinematic range Q2 > 1 GeV2, 0.006 < I < 0.6. The first moment If = rsi g$z = 0.023 f 0.020 (stat.) f 0.015 (syst.) is smaller than the prediction of the Ellis-Jaffe sum rules. We find that the fraction of the nucleon spin carried by strange quarks As is appreciable and negative. Using earlier measurements of 6, we infer the first moment of the spindependent neutron structure function gy. Our combined analysis of all the available data on the spin-dependent structure functions of the nucleon shows an excellent agreement among the data sets. We do not find significant deviations from the prediction of the Bjorken sum rule.

/pdf/the-spin-structure-of-the-deuteron-26q2mlrxo2.pdf

The Spin structure of the deuteron

An introduction is given to the physics of deep inelastic scattering with polarized muon beams on polarized nuclear targets. Earlier results on this subject are reviewed and an outlook is given on current and future experiments in this field.

/pdf/deep-inelastic-scattering-of-polarized-muons-4rbo2vg3r0.pdf

Deep inelastic scattering of polarized muons

A review is given of recent results from the deep inelastic muon scattering program at CERN, focusing on high statistics measurements of scaling violations and tests of QCD, and on past and future experiments to measure the spin structure functions of the nucleon.

/pdf/highlights-from-muon-scattering-at-cern-kz09uh5jv8.pdf

Highlights from muon scattering at CERN

Measurements of the nucleon spin structure at SLAC in end station A.

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Measurements of the nucleon spin structure at SLAC in end station A.