Linac Operation

Linac operation – Turn on Procedure – May 6, 2003

- Turn on monitors and oscilloscopes.

- Start up computers and login in.

- Open the GUI controller “atf” and distribute four sliders “Gun Phase”, “Gun Attenuator”, “Linac Phase” and “Linac Attenuator” at the bottom of monitor.

- According to the check list:

· RF Levels At Zero - On GUI controller, make sure no power is fed to cavities. –

· Reset Radiation Alarm Panel – All indicators should be green. –

· Linac WaterTemp. – Measure the temp. of linac body –

· L.E.B.T. Gate Secured - Steel-mesh type gate –

 H.E.B.T. Plug Door Secured – Big wall under the mezzanine –

· Gun Temp. Setting Point - Pre-set temp. of chiller - & increase temp. 1 deg.

· Laser Secured – Indicator of laser secured should be on –

· Vacuum at Mezzanine

· Open three gate valves “Gun Valve”, “HEBT Valve” and “Experimental Hall Valve” after making sure the pressure is OK.

· AC Power On: Modulators – Feed HV to modulator of rf –

 

- Turn on flame grabber boards and run with “Continuous”

- Feed RF powers to RF gun and Linac, observing the oscillo-
scope.
Forward to RF gun should be within the dotted line.
Input to linac should be within a display of oscilloscope.
Wait 10 minutes until the reflection of RF becomes minimum.

- Adjust the temperature of chiller.
Reflection from RF gun should be flat near zero.

- Restore the data and drive linac

- On the GUI controller, tune the injector as follows;

· Click “Front End Laser Optics”
· Open UV shutter and laser shutter
· Insert the screen LPOP-UP1
· Tune the gun phase so that the charge is at maximum.
Oscilloscope range is set to be 5 V/div.
· At the next computer, start up “Beam diagnostic.mad” and choose “Math” -> “Calculate Worksheet”
                -e.g., charge v.s. injection phase is automatically measured.
                -Print out the result (only 2nd page).

Linac operation – Sending e-beam to experimental hall –

- Pick up four keys, #25 to #28 from the key box.

- Fill out the log.

- Insert the key #25 (permit #1) to the position #1 and turn to the right.

- Insert the key #26 (permit #2) to the position #2.

- Insert the key #27 to the position “Right”.

- Insert the key #28 to the position “Left”.

At Entrance of Experimental hall

- Enter the experimental hall and make sure nobody is there.

- Make an announcement, “Attention, experimental hall will be interlocked now.”

- Push the button #5, #4, #3, and #2.

experimental hall

- Turn off the light of experimental hall

- Push the small black button at the right of the entrance and open the door.

- Close the door and push the button #1 until the indicator on.

At the entrance of experimental hall

- Turn the key #26 to the right and push green button. -> open the gate.

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Last Modified: December 3, 2007
Please forward all questions about this site to: Christina Swinson