Latest Results on Beam Loaded Experiments at FLASH/TTF Shilun Pei October 27,

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Presentation transcript:

Latest Results on Beam Loaded Experiments at FLASH/TTF Shilun Pei October 27,

Introduction Experiments with heavy beam loading were done in September 17-20, Adaptive feed-forward and orbit feedback were not adopted, only feedback was used. And, all of the experiments were tuned manually with manual beam loading compensation. Beam loaded data with piezo on and off was collected. 3mA (1MHz/3nC) pulse currents for longer bunch trains of 800 bunches (800µs) can be ran successfully. 9mA (3MHz/3nC) pulse currents for shorter bunch trains of bunches ( µs) can be ran stably but with few bunch train cuts. 9mA (3MHz/3nC) pulse currents with bunch-trains of close to 2400 bunches (800µs) can be ran but with too many bunch train cuts.

1 st Forward Flat Top Statistics (Measurement Noise Error Subtracted) Red: 1MHz/3nC beam with piezo off; Blue: 3MHz/3nC beam with piezo off; Green: 3MHz/3nC beam with piezo on. With beam (feedback on)Without beam (open loop) September 2009 Measurement January 2009 Measurement Blue: nominal + 100Hz Initial detuning with piezo off; Red: nominal initial detuning with piezo off; Green: nominal – 100Hz initial detuning with piezo off.

2 nd Forward Flat Top Statistics (1) (Measurement Noise Error Subtracted) With beam (feedback on)Without beam (open loop) September 2009 Measurement January 2009 Measurement Red: 1MHz/3nC beam with piezo off; Blue: 3MHz/3nC beam with piezo off; Green: 3MHz/3nC beam with piezo on. Blue: nominal + 100Hz Initial detuning with piezo off; Red: nominal initial detuning with piezo off; Green: nominal – 100Hz initial detuning with piezo off.

2 nd Forward Flat Top Statistics (2) (Measurement Noise Error Subtracted) With beam (feedback on)Without beam (open loop) September 2009 Measurement January 2009 Measurement Red: 1MHz/3nC beam with piezo off; Blue: 3MHz/3nC beam with piezo off; Green: 3MHz/3nC beam with piezo on. Blue: nominal + 100Hz Initial detuning with piezo off; Red: nominal initial detuning with piezo off; Green: nominal – 100Hz initial detuning with piezo off; Black: nominal initial detuning with piezo on.

Probe Flat Top Statistics (1) (Measurement Noise Error Included) With beam (feedback on)Without beam (open loop) September 2009 Measurement January 2009 Measurement Red: 1MHz/3nC beam with piezo off; Blue: 3MHz/3nC beam with piezo off; Green: 3MHz/3nC beam with piezo on. Blue: nominal + 100Hz Initial detuning with piezo off; Red: nominal initial detuning with piezo off; Green: nominal – 100Hz initial detuning with piezo off.

Probe Flat Top Statistics (2) (Measurement Noise Error Included) Red: nominal initial detuning with piezo off (see slide 8 for the corresponding reflection ratio). Black: nominal initial detuning with piezo on (see slide 8 for the corresponding reflection ratio). With beam (feedback on) Without beam (open loop) September 2009 Measurement January 2009 Measurement Red: 1MHz/3nC beam with piezo off; Blue: 3MHz/3nC beam with piezo off (see slide 7 for the corresponding reflection ratio); Green: 3MHz/3nC beam with piezo on (see slide 7 for the corresponding reflection ratio).

Reflected Signal for Beam on Case September 2009 Measurement Cavities in ACC6 with piezo off 3MHz/3nC beam with 1600 bunches Cavities in ACC6 with Piezo on 3MHz/3nC beam with 1500 bunches

Piezo Off with Nominal Initial Detuning Reflected Ratio for Beam off Case Piezo On with Nominal Initial Detuning Piezo works well to reduce the reflection ratio for open loop beam off case as expected. t A January 2009 Measurement

RF Power Overhead Issue September 2009 Measurement Cavities in ACC6 with piezo off 3MHz/3nC beam with 1600 bunches Cavities in ACC6 with Piezo on 3MHz/3nC beam with 1500 bunches

2nd Forward Flat Top Jitter vs Charge Jitter September 2009 Measurement Red: 1MHz/3nC beam with piezo off; Blue: 3MHz/3nC beam with piezo off; Green: 3MHz/3nC beam with piezo on.

Summary With beam on and piezo on/off, the 1st forward flat top jitter stay at the same level as the no beam open loop case, but the 2nd forward flat top jitter will go to much higher value, especially for the piezo on case. Piezo will increase the 2nd forward flat top rf jitter. No matter the beam and the piezo on or off, the probe signal jitter will stay lower than 1%. In addition, with beam on, the jitter for the piezo on case may be lower than that for the piezo off case, which is different from the no beam open loop case and might be caused by the inappropriate initial detuning and the bigger reflection ratio (>30%). For both beam on and off case, the piezo works well to reduce the reflection ratio. Particularly for the beam on case, the piezo reduces the RF power overhead clearly. For the same beam current, the forward flat top jitter is roughly proportional to the bunch charge jitter.