general information about controls, daq and online processing/storage for xes
G. Haller (based on docs by several people)
SLAC-R-XXX
14-May-2007
Prepared for the Department of Energy
Under Contract Number DE-AC02-76SF0015
Published by
Stanford Linear Accelerator Center
LCLS Controls
2575 Sand Hill Road
Menlo Park, CA 94025
This document and the material and data contained herein was developed under the sponsorship of the United States Government. Neither the United States nor the Department of Energy, nor the Leland Stanford Junior University, nor their employees, makes any warranty, express or implied, or assumes any liability or responsibility for accuracy, completeness or usefulness of any information, apparatus, product or process disclosed, or represents that its use will not infringe privately owned rights. Mention of any product, its manufacturer, or suppliers shall not, nor it is intended to, imply approval, disapproval, or fitness for any particular use. A royalty-free, non-exclusive right to use and disseminate same for any purpose whatsoever, is expressly reserved to the United States and the University.
Contents
Purpose
The purpose of this document is to provide information for controls, daq, online processing, archival, and analysis needed for the AMOS experiment. First the bigger picture is described before focusing on the AMOS part.
Introduction
The LCLS will deliver X-ray laser pulses in the approximate energy range of 800eV - 8000eV which corresponds to wavelengths of 15 Å - 1.5 Å. The pulse repetition rate will be up to 120Hz, the duration of each pulse will range from 10fs – 200fs and have intensities up to 1018 W/cm2. The photon beam pulses will be delivered at a specified rate, energy and duration for a given set of experiments. These unprecedented characteristics will make possible a range of experiments whose full capability is still being explored. http://www-ssrl.slac.stanford.edu/lcls/.
The duration of individual experiments can vary widely. Under ideal conditions and as experience is gained, some experiments may collect all of the data needed in a few days while others may require weeks to months, collecting data for many different samples. As is the case with current synchrotron facilities, the users that design, construct, operate and analyze the data from these experiments may come from a wide variety of backgrounds, both academia and industry. Each experiment is complex with its own set of subsystems that require detailed engineering design and testing and thus involves Engineers, Biologists, Physicists and technicians.
BTH
UNDULATOR HALL
ELECTRON BEAM DUMP & FEE
NEAR EXPERIMENTAL HALL AND CENTRAL LABS & OFFICE
X-RAY TRANSPORT & DIAGNOSTICS TUNNEL
FAR EXPERIMENTAL HALL
At grade in RSY
Cut & Cover
Location of
Pep Ring Rd
LCLS Sections
Undulator: Essentially generates Xrays by “wiggeling” the electronic beam.
Front-End Enclosure (FEE):
Contains mirrors to steer the beam to the respective hutch.
Contains the majority of the Xray Transport Optics and Diagnostics package, XTOD (discussed elsewhere)
Beam-intensity to the experiments is controlled through limit request to the gas attenuator and the solid attenuator. These are not critical for safety and are made over channel access protocol (EPICS).
XTOD Diagnostics Package in FEE
Slit
Gas Detector
Gas
Detector
Gas Attenuator
Solid
Attenuators
Direct Imager
(Scintillator)
Total Energy
FEL Offset Mirror System
Collimator 1
Spectrometer
Package
Fixed
Mask
Beam Direction
Six eXperiment End Station Systems (XES) have been identified for initial use by LCLS experiments. These stations are physically staged in a self-contained and enclosed experiment “hutch”. These six hutches are arranged along the LCLS beam line. Three hutches are in the Near Experiment Hall (NEH) and three hutches are further downstream, in the Far Experiment Hall (FEH). All six hutches are capable of simultaneous operation. There is one XES in each hutch and those two terms are occasionally transposed.
Near-Experi
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