ALICE RF System Andy Moss & Alan Wheelhouse, ASTeC, Daresbury Laboratory

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

ALICE RF System Andy Moss & Alan Wheelhouse,ASTeC, Daresbury Laboratory

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

RF System

• Main Menu

• RF Operation– Switching on the IOTs– RF Control

• Monitoring Systems– IOTs– Linac & Booster Cavities– Buncher Cavity– Pressure Monitoring

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

Main MenuRF Drop Down Menu RF Buncher RF Booster 1 RF Booster 2 RF Linac 1 RF Linac 2 RF PSU Linac Module Booster Module RF Buncher Adhoc RF Gain Tuner Motor Test

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

RF Operation

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

RF PSU Control

• Analogue Monitoring

• Control Area• IOT Monitoring

Main Menu → RF → RF PSU

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

Switching On The IOTs

• Press (Hold down)– Aux ON– SB ON

• Filaments need 10 minutes

• Check ion current is <1µA

• HV ON– HV will slowly rise to

27kV, ~600mA• Check ion current is

<1µA• Allow 10 minutes for the

quiescent currents to stabilise

• Switch RF ON

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

RF On• Trace seen on

oscilloscope• RF raised on each IOT to

provide the required gradient for each of the Linac and Booster cavities

• Check ion current is <1µA• Ditto for the solid state

amplifier on the Buncher cavity

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

RF Control – Linac & Booster Cavities

• RF power adjusted using the gradient

• RF phase adjustment (station phase)

• All other controls are fixed

Main Menu → RF → RF Linac 1

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

RF Control – Buncher Cavity

• RF power adjusted using the gradient

• RF phase (station phase)

• All other controls are fixed

Main Menu → RF → RF Buncher

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

Operation

• Quench– RF should switch off– If not immediately switch off rf press HV ON

• Trips– Re-apply

• Constant trips seek assistance– IOT arc detector trips need to be reset at the PLC

• An additional screen will be added in the future

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

Monitoring Systems

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

IOT Readings

• All IOT limits are set within the PLC

• Power measurements– Drive – Output– Additional voltage

readings

Main Menu → RF → RF PSU → LC IOT5

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

Booster & Linac Readings

• Power Measurements– Waveguide power– Cavity probe power

Main Menu → RF → RF PSU → Linac

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

Buncher Readings

Main Menu → RF → RF PSU → Buncher

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

Calibration Readings

• Calibration readings for all the power measurements

• DO NOT TOUCH

Main Menu → RF → Adhoc RF Gain

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

SC Module Monitoring

• Monitoring for Booster and Linac Cavities– Cavity power and

gradient– Waveguide powers– Cavity pressure– Cold & warm

window temperatures

Main Menu → RF → Linac Module

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

Machine Vacuum MonitoringMain Menu → Machine → Vacuum

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

Injector Vacuum MonitoringMain Menu → Injector → Vacuum

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

Monitoring

• Radiation monitoring• Pressure monitoring

Main Menu → General → Monitoring

22nd July 2008 ALICE RF System Andy Moss/Alan Wheelhouse

Monitoring - GraphsMain Menu → Injector → Injector Vacuum → Log Pressure 1hr