Stephen Schuh Vacuum Controls Hardware 27 February 2006 LCLS Vacuum Controls Hardware Meeting 27 February 2006

Stephen Schuh Vacuum Controls Hardware 27 February 2006 Outline Gamma Ion Pump Power Supply Configuration of supply MKS Cold Cathode / Pirani Gauge Controller Configuration of controller Granville-Philips Hot Filament / Pirani Gauge Controller Which controller should we use? New or old?

Stephen Schuh Vacuum Controls Hardware 27 February 2006 Ion Pump Power Supply: Gamma MPC

Stephen Schuh Vacuum Controls Hardware 27 February 2006 Gamma MPC Configuration – page 1 Two independent high voltage channels Each channel has two King’s connectors; total of four 5.6 kV output Positive polarity Positive polarity for noble diode type pumps (Note: StarCell pumps would require negative polarity) Medium HV module Starting capacity of 200W, 100mA Full operation of 10 l/s to 200 l/s Larger pumps if well roughed or under high vacuum

Stephen Schuh Vacuum Controls Hardware 27 February 2006 Gamma MPC Configuration – page 2 Power source: US 110V No TSP or NEG option Remote control and status: Relay input for HV on/off (High Voltage Enable connector) Analog outputs for pump voltage and current (analog connector) Relay outputs for four process control set points RS232 commands for all other settings: view or modify set point configuration, view power supply status, etc.

Stephen Schuh Vacuum Controls Hardware 27 February 2006 Cold Cathode / Pirani Gauge Controller: MKS 937A

Stephen Schuh Vacuum Controls Hardware 27 February 2006 MKS 937A Configuration – page 1 Power source: 120VAC, 60Hz Measurement unit: Torr Gauge configuration: Four gauges Base: Cold cathode, fast response (15 msec) Slot 1: Cold cathode, fast response (15 msec) Slot 2: Dual convection-enhanced Pirani

Stephen Schuh Vacuum Controls Hardware 27 February 2006 MKS 937A Configuration – page 2 Remote control and status: Turn cold cathode gauges on/off Relay outputs for four process control set points (1 per gauge) Each gauge has 2 analog outputs for pressure, buffered and logarithmic Each cold cathode / Pirani pair has 1 combined analog output for pressure

Stephen Schuh Vacuum Controls Hardware 27 February 2006 Hot filament gauge controller Two hot filament gauges located near gun More hot filament gauges may be installed in x-ray end stations; nobody knows how many Question: Buy two more of the standard SLAC controllers, or buy a newer model?

Stephen Schuh Vacuum Controls Hardware 27 February 2006 Hot filament gauge controller: Two options Granville-Philips 307: SLAC standardGranville-Philips 370: newer controller $2550~$3500 Special SLAC configuration for gauge on/off: Two inputs for gauge on and gauge off, rather than one toggle input Can be ordered with or without SLAC gauge on/off modifications No gauge-specific calibration Accuracy ~10% Gauge-specific calibration Accuracy ~5% Switch filaments by rotating plug in tunnel Switch filaments from controller Spares exist at SLACNo spares at SLAC