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L1S Jitter with AIP Modulator

L1S Jitter with AIP Modulator. Franz-Josef Decker 25-Sep-2014. L1S Phase Jitter History. 0.04 deg  0.07-0.12 deg it is bad now TDLY: Modulator pulse cuts into RF pulse HV higher and then better jitter is new!. Sep. 2014. July 2014. TDLY: -5.7  -4.2 us. HV: 300  320 kV.

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L1S Jitter with AIP Modulator

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  1. L1S Jitter with AIP Modulator Franz-Josef Decker 25-Sep-2014

  2. L1S Phase Jitter History • 0.04 deg 0.07-0.12 deg it is bad now • TDLY: Modulator pulse cuts into RF pulse • HV higher and then better jitter is new! Sep. 2014 July 2014 TDLY: -5.7  -4.2 us HV: 300  320 kV

  3. L1S HV Scan • AIP modulator “allows” it 300 kV 340 kV Phase Jitter [deg]

  4. AIP SCR Modulator Upgrade(before and after) • L1X shows similar behavior to L1S • Looks like timing jitter July 2014 Sep 2014

  5. L1S • Lost July  Sep.  Best for Sep

  6. More L1S • Reminder: 100 ppm  0.05 deg Lowest timing jitter Maybe thyratron worse

  7. Thyratron back swing jitter • It shouldn’t have this two state

  8. L1S is Main Source of DL2 E-Jitter • L1S phase is nearly 75% of energy jitter power, (DE/E = 0.025  0.057 %) • And phase is 86 % correlated to HV Phase deg 86 % HV counts

  9. Summary • New L1S modulator and Klystron setup is 2-3 times worse • It “seems” to point to SCR switched AIP upgraded modulator • Many more variations happened: new thyratron, 30120 Hz, -50  -75 V thyratron bias change, filter in trigger bypassed, LC for DQ-ing, Ross devider, … • To do: Secondary power supply, …

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