1 FONT IP FB Philip Burrows Robert Apsimon, Doug Bett, Neven Blaskovic, Glenn Christian, Michael Davis, Colin Perry John Adams Institute Oxford University.

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Presentation transcript:

1 FONT IP FB Philip Burrows Robert Apsimon, Doug Bett, Neven Blaskovic, Glenn Christian, Michael Davis, Colin Perry John Adams Institute Oxford University

2 IP kickerIPBPMs Digital feedback IPBPM electronics Drive amplifier e- Eventual IP FB loop scheme

3 Hardware assignments IPBPMs and chamber: KNU, LAL IPBPM electronics: KNU Digital FB board: JAI Oxford Drive amplifier: JAI Oxford IP kicker: KEK

FONT5 digital FB board Xilinx Virtex5 FPGA 9 ADC input channels (TI ADS5474) 4 DAC output channels (AD9744) Clocked at 357 MHz phase-locked to beam

5 FONT5 amplifier, built by TMD Technologies Specifications: +- 15A (kicker terminated with 50 Ohm) +- 30A (kicker shorted at far end) 35ns risetime (to 90%) pulse length 10 us repetition rate 10 Hz Drive amplifier

6 IP kicker: modify stripline BPM Colin Perry

7 New IP kicker

8 New IP kicker installed Installed late May

9 Priorities for June 2012 run Test new IP kicker: ensure functionality measure dynamic range of kick Digitise existing IPBPM signals gain experience with cavity BPM signals exercise FONT5 board in this mode, at IP

10 Thanks to Terunuma-san and ATF colleagues: IP kicker fabrication, installation + beam tests Young Im: will join JAI Oxford in July Honda-san: use of BPM electronics Stewart: setup + calibration of current IPBPMs

11 Experimental setup IPBPM A+B signals split: 1) SLAC electronics  ATF controls 2) Honda-san electronics  FONT5 board allows cross-check of standard electronics and FONT digitised readout Monitoring of current + voltage in IP kicker Ad hoc cabling and setup required for tests

12 Experimental setup

13 IP kicker setup + tests Trigger signal (‘pre-beam’) Controllable delay for kicker output Kicker drive signal  amplifier Vary DAC on drive signal Observe kicked beam on IPBPMs, with standard EPICS readout Jitter minimisation

14 Jitter minimisation at IPBPM A EPICS readout of IPBPM Scan of QD0FF current

15 IP kicker delay scan EPICS readout of IPBPMs

16 IP kicker drive scan EPICS readout of IPBPMs

17 IP kicker conclusions Kicker is working well FONT amplifier is able to drive kicker Dynamic kick range almost um at IPBPMs Linear kick range > um  plenty of drive for beam IP

18 Digital IPBPM readout Lot of basic setup + learning on our part! Lot of IPBPM waveforms digitised + recorded, in 1- and 2-bunch modes Recorded I and Q Summary of highlights: Digitised waveforms QD0FF mover scans

19 Examples of digitised waveforms 1-bunch mode Digitised I and Q WARNING: LO not phase- locked; saturation

20 Examples of digitised waveforms 2-bunch mode WARNING: LO power low – not usual operating mode

21 QD0FF mover scan Digitised signals

22 QD0FF mover scan Comparison of SLAC + EPICS readout vs. Honda + FONT readout Detailed analysis in progress!

23 Summary First experimental tests for ATF2 goal 2: New IP kicker exercised with FONT digital drive and FONT amplifier beam kick successfully observed dynamic range larger than needed IPBPMs instrumented with Honda-san electronics, and read out digitally via FONT5 board digitisation works fine cross-checked with SLAC + EPICS lots of data to analyse!

24 Plans First