1. Latest Results from Digital Tune Monitor Vsevolod Kamerdzhiev (APD) Alexei Semenov (Instrumentation) Tevatron Dept. meeting, March 16, 2007

2. V. Kamerdzhiev, A. SemenovAPD meeting, April 4, 20072 Latest results ( store #5301) vertical spectra for all 36 proton bunches linear scale gaussian fit T:STRDUR=20min The tune distribution is computed in the assumption that there is only one (vertical) peak in the spectrum

3. V. Kamerdzhiev, A. SemenovAPD meeting, April 4, 20073 Beam excitation 6dB Hor 9dB Vert

4. V. Kamerdzhiev, A. SemenovAPD meeting, April 4, 20074 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

5. V. Kamerdzhiev, A. SemenovAPD meeting, April 4, 20075 Sharing TEV BPMs and Kickers in progress

6. V. Kamerdzhiev, A. SemenovAPD meeting, April 4, 20076 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