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This document provides details on the requirements, design, interfaces, schedule, and current status of the LCLS wire scanners. The requirements include performance specifications, mechanical assembly distance measurement, motor beam limit switches, and more. The design involves a revised plan for wire position determination and various interfaces for synchronization, beam centroid normalization, beam current normalization, user interface, and programmatic interface. The deployment schedule outlines the timeline for electrical equipment evaluation, mechanical assembly, software development, user interaction, calibration process testing, and operational testing. The current status includes the availability of motors, motor controllers, ADC and carrier card for a prototype, LVDT and electronics, HV power supplies, PMTs, and lab space for assembly and testing. Mock-up screens for user interaction, cable plant specification, and software interface design have been completed, while software development is still ongoing. It is expected to have seven wire scanners and one collimation system in place by December.
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1 LCLS Wire Scanners • Requirements • Design • Interfaces • Schedule • Status
Requirements • Performance Requirements • 5 µm step in X or Y axis • 2 µm RMS position precision over 500 µm • ±10 µm absolute position reproducibility • 63,500 µm travel range • 50 - 15,000 µm per second velocity range • 0.2 - 1.0 nC range of Charge
Mechanical Assembly Distance Measurement (LVDT or similar) Motor Beam Limit Switches
Design Change • Original Plan involved measuring wire position directly using high resolution linear measurement of Wire Frame • Revised Plan involves counting steps of stepping Motor Motion to determine position
Interfaces • Timing System for Synchronization • BPMs for Pulse-to-pulseBeam Centroid Normalization • Toroids for Pulse-to-pulseBeam Current Normalization • User Interface via XAL Java-based Client • Programmatic Interface based on ChannelAccess to roughly 50 EPICS Records per Scanner • Network for Channel Access, to provide BPM, Toroid and API Interface
Schedule • Electrical Equipment for Evaluation Dec 2005 • Motion Controllers, Motors, QDC, LVDT, High Voltage, PMTs, Gas-Ion Chamber, CPU, VME Chassis • First Mechanical Assembly expected May/June 2006 • Prototype based on existing wire scanner by Feb 1, 2006 • IOC Software (including drivers) Feb 2006 • First Prototype by March 2006 • User Interaction Software by May 2006 • Screen mock ups for user review by January 2006 • Maintenance, Commissioning Screens April 2006 • Other Functional Requirements Met by May/June 2006 • Calibration Process Tested and Documented by July 2006 • Seven Units Operational and Tested by November 2006
Current Status • We currently have Motors and Motor Controllers, ADC and Carrier Card for a Prototype • VME Chassis and CPU are available and working for the prototype • We have access to LVDT and Electronics • We also have access to HV Power Supplies,PMTs and bases • We have Lab space available forPrototype Assembly and Testing
Current Status • First pass of mock-up screens for user interaction are complete and informally reviewed by Users; have positive feedback and suggestions • Cable Plant has been specified, and ElectricalInterconnect Diagrams are nearing completion • First pass of Software Interface (API) for High-level Applications is complete, and first design iteration has started • Software is still needed; device drivers, IOC configuration and software • We expect to have 7 wire scanners and1 collimation system in place by December
