1. Stephen Schuh Vacuum Controls Hardware Meetingschuhs@slac.stanford.edu 27 February 2006 LCLS Vacuum Controls Hardware Meeting 27 February 2006

2. Stephen Schuh Vacuum Controls Hardware Meetingschuhs@slac.stanford.edu 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?

3. Stephen Schuh Vacuum Controls Hardware Meetingschuhs@slac.stanford.edu 27 February 2006 Ion Pump Power Supply: Gamma MPC

4. Stephen Schuh Vacuum Controls Hardware Meetingschuhs@slac.stanford.edu 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

5. Stephen Schuh Vacuum Controls Hardware Meetingschuhs@slac.stanford.edu 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.

6. Stephen Schuh Vacuum Controls Hardware Meetingschuhs@slac.stanford.edu 27 February 2006 Cold Cathode / Pirani Gauge Controller: MKS 937A

7. Stephen Schuh Vacuum Controls Hardware Meetingschuhs@slac.stanford.edu 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

8. Stephen Schuh Vacuum Controls Hardware Meetingschuhs@slac.stanford.edu 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

9. Stephen Schuh Vacuum Controls Hardware Meetingschuhs@slac.stanford.edu 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?

10. Stephen Schuh Vacuum Controls Hardware Meetingschuhs@slac.stanford.edu 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