[esa-t474] bpm freq vs run

[Mark Slater]

Oops. Yes, I was assuming external clock (119). Can I just check, running 
with internal clock, we're OK provided we have a reference cavity in each 
SIS. If so, is that what we had?

Thanks,

Mark

On Thu, 7 Feb 2008, Bino Maiheu wrote:

> 	Hi all,
> 
> I've added 3 entries for the BPM frequencies versus runnumber
> ( currently only the last part of the run, so 2725 - 2850 ), again, I'll
> update plots as soon as the cluster spits the fits out.
> 
> https://www.hep.ucl.ac.uk/elog//T-474/97
> https://www.hep.ucl.ac.uk/elog//T-474/96
> https://www.hep.ucl.ac.uk/elog//T-474/95
> 
> I did notice the frequency for BPM 5 takes a rather big jump around
> 2760, found the following log entry from the run database.
> 
> Shift Crew : Alex, Johnny
> Active DAQ Subprocesses : SAM HV MAG MCC CV cas hall nmr Nfs
> DAQ Comments : Magnets to +150A, stability 
> User Comments : 40k stability run while Alex measured 3BPM7 with scope,
> Decided to have an access to install the scope as the beam is not very
> useful, finally finished the access, installed the TDS scope back to
> look at 3BPM7 signals and put a diode probe onto Q10 -> SIS 4(?):7
> 
> I'm a bit suspicious some channel might have been swapped there. Will
> investigate by looking at the fitted waveforms...
> 
> I'll have a look to some decay constants and t0's next...
> 
> Mark, I did notice your plots seem to have slightly higher frequencies
> for BPM7. This is probably due to the fact that you assume external
> clock. A quick calculation shows they are compatible with what i find
> ( / 119. * 100. ). Just to make sure we are certain that during the july
> run we ran with internal clock the entire time ?? 
> 
> 
> Bino
> 
> -- 
>                                                   !!!!!
>                                                  ( o o )
>           @ -- Bino Maiheu, Dr. ;) ---------oOO----(_)----OOo------- @
>          /  :: WORK                .::  /  :: HOME             .::  /
>         /  University College London   /                           /
>        /  Physics and Astronomy       /  31 Kilgour Road          /
>       /  Gower Street                /  Forest Hill              /
>      /  London WC1E 6BT             /  London SE23 1PG          /
>     /  [tel] +44 20 7679 3454      /  United Kingdom           /
>    /  [fax] +44 20 7679 7145      /  [mob] +44 7747 75 58 78  /
>   @ -------------------------------------------------------- @
> 
> 
> _______________________________________________
> esa-t474 mailing list
> esa-t474 at hep.ucl.ac.uk
> https://mail.hep.ucl.ac.uk/mailman/listinfo/esa-t474
>