Latest results from digital tune monitor
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Latest Results from Digital Tune Monitor. Vsevolod Kamerdzhiev (APD) Alexei Semenov (Instrumentation). Tevatron Dept. meeting, March 16, 2007. Latest results ( store #5301). vertical spectra for all 36 proton bunches. linear scale gaussian fit T:STRDUR=20min.

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Latest Results from Digital Tune Monitor

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Latest results from digital tune monitor

Latest Results from Digital Tune Monitor

Vsevolod Kamerdzhiev (APD)Alexei Semenov (Instrumentation)

Tevatron Dept. meeting, March 16, 2007


Latest results store 5301

Latest results ( store #5301)

vertical spectra for all 36 proton bunches

linear scale

gaussian fitT:STRDUR=20min

The tune distribution is computed in the assumption that there is only one (vertical) peak in the spectrum

APD meeting, April 4, 2007


Beam excitation

Beam excitation

6dB

Hor

9dB

Vert

APD meeting, April 4, 2007


Experience

Experience

  • The sensitivity is high enough to reliably measure spectra for every single proton bunch

  • Dynamic range problem has been solved/mitigated by implementing an algorithm which automatically adjusts offset for each bunch

  • Beam motion is a crucial factor for routine operation of the DTM. Only VBPMB11 (and presumably other high-beta BPMs around IPs) appears to be suitable.

  • To get the best possible S/N ratio the DTM has to “take over” the pickup plates

APD meeting, April 4, 2007


Sharing tev bpms and kickers

Sharing TEV BPMs and Kickers

in progress

APD meeting, April 4, 2007


Summary

Summary

  • The DTM is installed in B1 service building sharing the pickup with the TEV BPM system by means of an RF splitter

  • As soon as the ordered coax relays arrive we’ll install them to be able to “take over” the pickup

  • Next steps:

    • to commission DTM’s own “tickler” (noise source + audio amplifier)

    • are there two peaks in the spectra?, study TEL Q, effect of pbars, etc...

    • Build the second DTM unit for the horizontal plane

APD meeting, April 4, 2007


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