Differences

This shows you the differences between two versions of the page.

--- playground:shutdown [2009/04/15 15:30] – Change to wiki numbering format; added line about not letting the corona points go negative. odonnell
+++ playground:shutdown [2026/06/25 16:12] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-==== Machine Shutdown ====
+==== Accelerator Shutdown ====
-** Machine Shutdown **
+.	Switch OVERVOLTAGE PROTECTION to DISABLE.
-   - Log Machine settings, log radiation monitor tape if necessary.
+.	Switch the control mode to GVM.
-   - Switch stabilizer to "AUTO"
-   - Put cup in -- when putting in L.E.  cup at high terminal voltage be prepared to run belt charge down as terminal voltage will increase when the beam loading is removed.
+.	Slowly turn the CONTROL GAIN to zero while watching the grid voltage.  If the grid voltage rises above -5 volts, reduce the CHARGING VOLTAGE to keep the grid voltage less than -5 volts, then continue reducing the CONTROL GAIN to zero.
-   - Switch stabilizer to "STANDBY".
-   - Turn "GRIDDED VOLTAGE TUBE LENS" down.
+.	Turn the CHARGING VOLTAGE dial down to 0.10
-   - Monitor corona current while changing belt charge; do not run in (extend) the corona points when the terminal charge may become negative (i.e. with the plastic belt).  Reverse current will damage the stabilizer circuit.
-   - Run belt charge down.
+.	Switch CHAIN MOTORS to OFF.
-   - Turn belt charge "OFF".
-   - Turn drive motor "OFF".
+.	Switch POWER SUPPLIES to OFF.
-   - Start Source shut down (all control room operations).
-   - Set steerers to zero and then to "OFF".
+.	Turn the TERMINAL VOLTAGE dial to zero.
-   - Run magnets and quadrupole lenses down (coarse to zero, fine to 500), then turn off (push the "power" button).
-   - Turn the beam profile monitor (BPM) to "OFF"
-   - Turn buncher and chopper power to "OFF".
-   - Complete control room source shutdown and run low energy extension einzel lenses down.
-   - //(Only for maintenance shutdown)// Switch stabilizer to "OFF".
-   - //(Only for maintenance shutdown)// Turn key switch "OFF".
-   - Complete source shut down in vault.