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Weekly meeting on Xboxes
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18/3-008 - CLIC Meeting room (CERN)
Description
https://cern.zoom.us/j/6910405761
Weekly meeting on Xboxes
Zoom Meeting ID
64847033219
Host
Nuria Catalan Lasheras
Alternative host
Marçà Boronat
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(MV)Attending: Paz Alonso Arias (PAA), Mareike Wendelmuth (MW), Nuria Catalan Las Heras (NClH), Anisullah Baig (AB), Igor Syratchev (IS), Lee Millar (LM), Marca Boronat (MB), Carmelo Barbagallo (CB), Matteo Volpi
CERN Xboxes news. Xbox2.Xbox2 running during night, no problems so far. Achieved power is 35MW but SSA is saturating. PAA asks about klystron and if she could go to higher voltage in modulator.
IS wonders about the tail of the short pulse, asks if we have breakdown. PAA and MW comment they are not seeing many breakdowns, but PAA set slow ramp because after calibration at higher powers, we were seeing a lot of vacuum activity. IS says we could change BDR to fasten the ramp or even manually go up.
NClHL asks to do a gain curve of the klystron. MB says that last time, when both structures went upt at 36MW, (long pulses), klystron was set at 390 kV (1200V). MB will send gains curves, but remembers calibration was a bit off, around 20MW at 270kV. PAA comments Scandinova people fixed calibration of beam current and voltage. LM says he will search the CPI datasheet to compare.
PAA explains about idea to measure breakdown current with extra attenuation (to avoid saturation). The attenuator is giving hugh reflection, resulting in it triggering the DC down breakdown flag. LM says maybe should be better to put a pure resistor. NClH says to go to Veronicas's lab to check if we have available resistors.
MW summarises her work on heating losses. Solved problem of power and heating in structures. (low PRF). Summary of CST simulations and breakdown current analysis.
News from Melbox. VNA is back and working, Paul working also. Start to pull cables to start conditioning the line. In January they will start conditioning of the line and then installation of the structure. Pulse compressor they wont open it, maybe change when it starts to breakdown.
News from Valencia. Pulsing, tests to see how it performs (problem in one of the klystrons, like breakdown inside klystron, recondition slowly, now its ok). Start conditioning structure next year (to max power, 12MW).
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