Strathclyde gun bead-pull results

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Presentation transcript:

Strathclyde gun bead-pull results

Cathode construction

Cathode frequencies Cathode 0 is the old cathode that was used for the most recent VELA run Cathode 1 is the first of the new cathodes All frequencies are converted to operating conditions

Cathode frequencies (2) I measured all of the new cathodes’ frequencies. The frequency of the gun with each cathode varies. All measurements were taken under the same conditions and with the same torque. This is consistent with reports of frequency varying when the cathode was changed before.

Bead-pull results with cathode 1 The field flatness is 0.59 with a standard deviation of 0.027 Simulation shows the hole in the cathode gives a negligible change in frequency and field flatness This would give an beam momentum of ~5 MeV/c at 7.5 MW compared to a flat cavity giving ~5.7 MeV/c. If this were the flatness of the cavity it would explain the missing momentum However…

Flatness error caused by frequency variation I modelled the frequency change from cathode 0 to cathode 1 as due to the full cathode face penetrating less into the cavity. The frequency change of 220 kHz can be caused by 77 μm movement of the cathode face – very sensitive! This corresponded to a field flatness of 0.62

Flatness error caused by frequency variation (2) This could explain almost the full field flatness deviation to within the error on the measurement. The question is now what is causing the frequency difference between the cathodes and can it be modelled as I have done here? Top choices so far are Thicker cathodes bow out more due to flange gap – Mechanical modelling to estimate magnitude Cathode flatness is poor – metrology to determine

Metrology- step height Cathode Nominal Manufacturer On site with touch probe 7.3 - 1 7.8 7.704? 7.644 2 7.802? 3 7.746 7.724 Based on the frequencies would expect 1 to be longest and 3 to be shortest – not the case.

Metrology- surface flatness Cathode 0

Metrology- surface flatness Cathode 1 Mark was unable to do interferometer measurement as there appears to be a high slope bump in the middle third – due to drilling?

Metrology- surface flatness Cathode 2

Metrology- surface flatness Cathode 3

Design with larger gap and 4.5mm thick copper VELA Cathode FEA Design with larger gap and 4.5mm thick copper 2500N applied to each screw location Current design 16.7µm in Z Deformation of copper 15.1µm in Z Deformation of copper Outer 3mm of copper fixed to represent face to face contact with gun.

Further work CMM/ stylus probe measurements at RAL to confirm measurements and answer concave/convex question Consider options for hole-less bead-pull? Design apparatus to deform cathode known amounts and re-measure frequency.