Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory
Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center LCLS Beamline Vacuum Hardware Leif Eriksson, Carl Rago, LCLS January 27, 2005 · · · Introduction Valves Gauges Pumps Misc. global vacuum documents in the works LCLS Beamline Vacuum Hardware Eriksson, Rago, LCLS eriksson@slac. stanford. edu
Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center Introduction Mark Reichanadter asked me to “look in to” beamline vacuum hardware to select components based on experiences at SLAC This will simply the integration of the beamline vacuum hardware with the LCLS and SLAC control systems Provide economy of scale for procurement To accomplish this task I have talked to: Dan Wright – SLAC Accelerator Department Carl Rago – LCLS Bob Dalesio – LCLS Chris Stone, Martin Semmler – MKS Bob Willis – Helix Technology Corp. Reviewed vacuum hardware choices for SPEAR-3 and SNS Goal for this meeting – Attempt to establish a consensus to use specific beamline vacuum hardware LCLS Beamline Vacuum Hardware Eriksson, Rago, LCLS eriksson@slac. stanford. edu
Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center Vacuum Valves Beamline Valves All-metal Leak tight to 2 E-10 torr liters s-1 Bakeable to >200°C Recommended Hardware VAT Series 48 for non-RF applications VAT, series 47 for RF applications Reliable All-metal Right Angle Valves All-metal Leak tight to 2 E-10 torr liters s-1 VAT Series 54, low cost all-metal angle valve VARIAN UHV All-metal valve: Bakeable to >200°C Part number 951 5014 – Mini CF Reliable Part number 951 5027 – 2 ¾” CF Part number 951 5032 – 4 ½” CF LCLS Beamline Vacuum Hardware Eriksson, Rago, LCLS eriksson@slac. stanford. edu
Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center Vacuum Gauges, common requirements Measurement range: Atmosphere to < 1 x 10 -10 Torr Convection Enhanced Pirani (MKS) or Convectron (Granville-Phillips) for atmosphere to 10 -3 Torr Ionization gauge for UHV measurement, Cold Cathode (MKS) or Hot Filament (Granville-Phillips) Need for set point relays to control valve operation, MPS, etc Survive significant radiation levels Sensors must be bakeable Communications with SLAC/LCLS control system required LCLS Beamline Vacuum Hardware Eriksson, Rago, LCLS eriksson@slac. stanford. edu
Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center MKS 317 Convection Enhanced Pirani Measures pressure from atmosphere to 1 E-3 torr Factory calibrated Gauges and controllers are interchangeable Radiation resistant Bakeable to 250°C with electronics removed Quick and easy to remove electronics, two screws CE Compliant Used at: Daresbury Labs – UK Soleil – France MPV – Australia Hardware suggested by MKS, not tested at SLAC – Suggest further testing before buying LCLS Beamline Vacuum Hardware Eriksson, Rago, LCLS eriksson@slac. stanford. edu
Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center MKS 422 Cold Cathode Ionization Gauge Enhanced version of the existing 421 sensor (used at SLAC) Sensor can operate during bake-out (250°C ) Measures pressure from 1 E-3 torr to 5 E 11 torr Uses LEMO radiation-resistant connectors Separate ion current and high voltage connector (increases accuracy of pressure measurement, no need for Triax connectors/ cables) Bakeable and radiation-resistant cables available CE Compliant Hardware suggested by MKS, not tested at SLAC – Suggest further testing before buying LCLS Beamline Vacuum Hardware Eriksson, Rago, LCLS eriksson@slac. stanford. edu
Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center MKS Gauge Controller Display up to 5 sensors simultaneously (most common: 2 x Pirani, 2 x cold cathode) Easy to operate 5 set points standard, 2 additional set points optional Fast response (15 msec analog output CE Compliant Used at SLAC LCLS Beamline Vacuum Hardware Eriksson, Rago, LCLS eriksson@slac. stanford. edu
Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center Granville-Phillips Convectron Gauge (Helix Technology Corp. ) Measures pressure from atmosphere to 1 E-3 torr Factory calibrated Gauges and controllers are interchangeable Bakeable Radiation resistant Good experiences from PEP-2 LCLS Beamline Vacuum Hardware Eriksson, Rago, LCLS eriksson@slac. stanford. edu
Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center Granville-Phillips Hot Filament Gauge (Helix Technology Corp. ) Measures pressure from 1 E-3 torr to 5 E-11 torr Bakeable Radiation resistant Hardware suggested by Helix, not tested at SLAC – Suggest further testing before buying LCLS Beamline Vacuum Hardware Eriksson, Rago, LCLS eriksson@slac. stanford. edu
Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center Granville-Phillips Gauge Controller (Helix Technology Corp. ) DC operated = Long cable lengths, no step-up transformer Can control 2 hot filament gauges + 2 convectron gauges Process control w. 6 set points RS-232 or IEEE-488 available Hardware suggested by Helix, not tested at SLAC – Suggest further testing before buying LCLS Beamline Vacuum Hardware Eriksson, Rago, LCLS eriksson@slac. stanford. edu
Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center Ion Pumps Gamma Vacuum (formerly Physical Electronics, formerly Perkin-Elmer) and Varian are the preferred vendors for ion pumps. Both Varian and Gamma Vacuum have a complete line of ion pumps that perform satisfactorily for Accelerator Systems. Diode or Noble diode type are preferred (positive HV input) Varian Star. Cell Connector on mini CF preferred on pump Good experiences at PEP-2 LCLS Beamline Vacuum Hardware eriksson@slac. stanford. edu
Linac Coherent Light Source Stanford Synchrotron Radiation Laboratory Stanford Linear Accelerator Center Misc. global LCLS vacuum documents in the works Engineering Specification Document - ESD, LCLS Mechanical - Vacuum Coming very soon! Interface Control Document - ICD, Mechanical – Vacuum vs. Controls Vacuum Coming very soon! LCLS Beamline Vacuum Hardware Eriksson, Rago, LCLS eriksson@slac. stanford. edu
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