PXIE 50 Ohm Fast Kicker: Measurement and Power Test...
Transcript of PXIE 50 Ohm Fast Kicker: Measurement and Power Test...
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PXIE 50 Ohm Fast Kicker: Measurement and Power Test Results of First Half Prototype
Ding Sun, Valeri Lebedev, Ralph Pasquinelli, Alexander Shemyakin, Alex Chen, David PetersonPIP-II MeetingJune 09, 2015
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50 Ohm fast kicker prototype (first half)
6/9/2015Ding Sun | PIP-II meeting2
First half was assembled and power tested (2014, 2015)Second half bas been soldered, measured rf property is identical to the first half
Feature:50 Ohm: use available commercial amplifierShielded delay lines: reduce coupling/dispersion/rise time.
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Specification
Specification:
Voltage: 250 V (flat top: 10%) Power: 625 WRise time: < 1nsSignal travelling time along beam direction should match beam traveling time:998.65 ps +/-10 ps (per kicking unit) Vacuum: 2E-7torr
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RF measurement
Network analyzer measurement (22 units):return loss/insertion loss/phase/dispersion etc.
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Delay Time Measurement (Network Analyzer)
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Delay time of each unit was controlled to 998.65ps +/- ~ 2 ps (Spec. : +/- 10 ps)
Delay time of 22 units should be (ideally) 21.970 nsDelay time of 22 units measured with NWA: 21.952 ns
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Delay Time Measurement (Oscilloscope/Arbitrary Waveform Generator)
Delay time of 22 units(ideally) 21.970 nsDelay time measured with scope 21.983 ns
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Rise time and delay time (oscilloscope)
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Rise time (average):Input: ~616-695 psOutput: ~768-842 psKicker: ~459-475 ps
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Rise time and delay time (oscilloscope)
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Pulse shape (kicker)
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Yellow trace: input signalCyan trace: output signal
Shows minimum distortion
Asked AWG (arbitrary waveform generator) to generate pulse: 1 ns rise time, 4 ns flat top…
The AWG is really “arbitrary” now...
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Pulse shape (accessories)
6/9/2015Ding Sun | PIP-II meeting10
Pulse shape distortion caused by accessories (all coax line components)
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Power test setup (August, 2014)
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Directional coupler, load and cables were retested after the kicker test
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Power test setup (May, 2015)
6/9/2015Ding Sun | PIP-II meeting12
Comark amplifier (3kW 162.5MHz)
15 kW load (water cooed)
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Power test of accessories (May, 2015)
6/9/2015Ding Sun | PIP-II meeting13
Directional couplers, adapters, load and cables were tested at 840 W for 8 hours before kicker test. Return loss/insertion loss at the end of test were the same as at beginning.
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Power test results
August, 2014 (250 MHz, CW)Final 4 hours at:Forward Power ~593 W, Transmitted Power ~524 W, Reflected Power 9 W (caused by accessories --- confirmed by a separate test without kicker)
May, 2015 (162.5 MHz, CW)7 days, most time at:Forward Power ~730-760 W, Transmitted Power 673-698 W, Reflected Power ~ <1 WFinal 8 hours at:Forward Power ~800 W, Transmitted Power ~739 W, Reflected Power ~ 1.2 W
Vacuum and temperature were monitored. Final vacuum: ~7-8E-8 torr at ~ 800 W
RF property measured before and after power test --- no change.
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Power test (August, 2014)
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Forward
Reflected
Transmitted
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Vacuum during power test (August, 2014)
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Fast time plot (180 second)
Ion pump was turned on
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Temperature during power test (August, 2014)
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At max. power level and power loss ~ 60 W (250MHz) for 4 hours, max. temperature increase of cable was ~ 6.5 F
Cooling water temperature:In (93.5 – 93.8F) Out (93.3 – 93.6)Flow rate 1 GPM
Ion pump was turned on
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Power test (May, 2015)
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Forward
Transmitted
ReflectedReflected (from load)
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Vacuum during power test (May, 2015)
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This spike is due to RGA measurement
Ion pump was turned on
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RGA measurement (May, 2015)
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~ 765 W into the kicker
0 power
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Temperature during power test (May, 2015)
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Cooling water temperatureIn 81.5 F, Out 80.6 FFlow rate: 1.4 GPM
At ~800W, power loss (~60W), the max. temperature of the cable was 89F.
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Calibration - IR measurement before power test
6/9/2015Ding Sun | PIP-II meeting22
Leftover of shredded fiber of woven insulation material of thermocouple after stripping
Cu electrode
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Electrode temperature during power test (IR measurement)(2014)
At max. power level and power loss ~ 60 W (250 MHz) for 4 hours (cable high temp. spot was ~ 98F). Viewport: ~8.75” away from electrode. High temp. spot (screw head, not slot edge):~111F(ε=0.55) ~146F(ε=0.25) -> “weighted average” ~135F (~57C)Low temp. spot (electrode): ~107F(ε=0.55) ~136 F(ε=0.25) -> “weighted average”~120F (~49C)Not accurate at all --- but may be used as a temp. range estimate
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RF measurement before and after power test (May, 2015)
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S21 (phase, delay time) Data: after power testMemory: before power test They are identical -> the structure did not change
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RF measurement before and after power test (May, 2015)
6/9/2015Ding Sun | PIP-II meeting25
S21 (magnitude) Data: after power testMemory: before power test They are identical -> the structure did not change
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RF measurement before power test (July, 2014)
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Insertion loss of full half structure before power test, July 2014
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Summary
The first half of the kicker prototype has met and exceeded all specifications.
The rf property of second half has been measured and is identical to the first half…
6/9/2015Ding Sun | PIP-II meeting27
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Thanks
Thank you for all your support (in addition to the people listed on the front page):
Jim Steimel, Bruce Hanna, David Franck, Ronald Kellett, Jerry Leibfritz, Jerzy Czajkowski and water group, Charles Briegel.
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