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Chevron^TM Start-up Procedure - Electrical Test Procedure

Getting Started

NOTE:

• Read the entire start-up procedure before applying any voltages.
• Refer to Diagram 1 - Typical Wiring Diagrams - for each detection mode.
• The suggested bias voltage for a Resistive Anode Encoder (RAE) is 300 volts.     

CAUTION:

• Do not exceed 1000V per Microchannel Plate (MCP) for 40:1 
  aspect ratio MCPS. 1200V/MCP for 60:1 aspect ratio MCPS.
• When installing flange mounted detectors gradually tighten the bolts in a star pattern (DO NOT exceed 20 foot-pounds per bolt). Failure to do so could cause the fiberoptic to crack.

RECOMMENDATION:

• For optimal lifetime, operate the detector at the minimum voltage necessary to obtain a useable signal.
• Do not operate the phosphor screen at a higher than recommended potential.

 

Procedure

Make all connections to the assembly. Check all electrical connections for possible shorted or open circuits.

Pump down to 2x10^-6 torr and hold for at least 15 hours.

 

Voltage Application:

Electron/Negative Ion/UV Photon Detection: (for a metal anode or Resistive Anode Encoder, skip to next section)

Phosphor Screen

Ground the input of the assembly (V_i). Apply voltage to the phosphor screen (V_a) in +250V, 1 minute increments. Stop at +1.0 kV.

Apply voltage to the output of the assembly (V_o) in +100V, 2 minute increments. Stop at +1.0 kV.

Increase the voltage to Va in +100V, 5 minute increments to +3.0 kV. Wait 5 minutes.

Increase the voltage to Va in +100V, 10 minute increments to +4.0 kV. Wait 5 minutes.      

Simultaneously increase the voltage to V_a and V_o in +100V, 10 minute increments to +4.5 kV at V_a and +1.5 kV at V_o.

For screens requiring a 5.0 kV potential - Increase the voltage to V_a in +100V, 10 minute increments to +5.5 kV. Wait 10 minutes.

For screens requiring a 5.0 kV potential - Increase the voltage to V_a in +50V, 10 minute increments to +6.5 kV. Wait 10 minutes.

Simultaneously increase the voltage to V_a and V_o in +50V, 10 minute increments to +2.0 kV at V_o.

When through using the detector, turn off the voltage to V_a. When the voltage drops below +2.0 kV, turn off the voltage to V_o. 

Metal Anode/Resistive Anode Encoder

Ground the input of the assembly (V_i). Apply the specified anode bias to V_a.

Increase the voltage to both V_a and V_o in +100V, 2 minute increments by +1.0 kV at V_a and to +1.0 kV at V_o. Wait 5 minutes.

Increase the voltage at V_o and V_a in +100V, 5 minute increments to +1.5 kV at V_o. Wait 10 minutes.

Increase the voltage at V_o and V_a in +50V, 5 minute increments to +2.0 kV at V_o.

When through using the detector, turn off the voltages to V_o and V_a.      

Positive Ion/UV Photon Detection (for a metal anode or Resistive Anode Encoder, skip to next section).

Phosphor Screen

Ground the output of the assembly (V_o). Apply voltage to the phosphor sheen (V_a) in +250V, 1 minute increments. Stop at +1.0 kV.

Apply voltage to the input of the assembly (V_i) in -100V, 2 minute increments. Stop at -1.0 kV.

Increase the voltage to V_a in +100V, 5 minute increments to +2.0 kV. Wait 5 minutes.

Increase the voltage to V_a in +100V, 10 minute increments to +3.0 kV. Wait 5 minutes.

Adjust the voltage to V_i in -100V, 10 minute increments to -1.5 kV.      

For screens requiring a 5.0 kV potential - Increase the voltage to V_a in +100V, 10 minute increments to +4.0 kV. Wait 10 minutes.

For screens requiring a 5.0 kV potential - Increase the voltage to V_a in +50V, 10 minute increments to +5.0 kV. Wait 10 minutes.

Adjust the voltage to V_i in -50V, 10 minute increments to -2.0 kV.

When through using the detector, turn off the voltages to the V_i and V_a.      

Metal Anode/Resistive Anode Encoder

Ground the output of the assembly (V_o). Apply the specified anode bias to V_a.

Apply voltage to V_i in -100V, 2 minute increments. Stop at -1.0 kV. Wait 2 minutes.

Adjust the voltage at V_i in -100V, 5 minute increments to -1.5 kV. Wait 5 minutes.

Adjust the voltage at V_i in -50V, 10 minute increments to -2.0 kV.

When through using the detector, turn off the voltages to V_i and V_a.      

 

Diagrams:

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