Re: [BLAST_TOF] CC update

From: Tancredi Botto (tancredi@mitlns.mit.edu)
Date: Tue Oct 08 2002 - 12:27:05 EDT


Hi tavi,
those cards with the HV info have a serial number. I need you to trace the
serial numbers of each tube in each box, and write next to it the recommended
voltage.

About using the PM amplifiers: it defintely helped. So I blame the low
C efficiency on the longer signal cables (possible ?). At the standard
voltages, I have 90-95 % efficiency on cosmic when requiring the OR and
55-60 % with the AND of the two sections of pmt from a C box
We know from yesterday that increasing voltage increases the efficiency

So, I will not change the C-input to the trigger (it will still be the
sum) but I'll feed the coinc to additional scaler channels

-- tancredi
________________________________________________________________________________
Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124
research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

On Tue, 8 Oct 2002, Octavian F Filoti wrote:

>
> Hi Tancredi,
>
> I have not found those references! That was all I could get (just for one
> box), since there were all in that logbook. I remembered there was a box
> with something else inside, and it might have the other references (though
> I am not sure), but there is nothing else in DTF. We should ask those who
> used that area after us (if they found something).
> But you can check that box and see if it is necessary to go on with this
> info! The logbook is in DTF on the table were other CC stuff is.
> Regards
>
> -----------------------
> Octavian F Filoti
> Nuclear Physics Group
> Univ. of New Hampshire
> 9 Library Way
> Durham, NH 03824
> phone: (603)862-1691
> FAX: (603)862-2998
> email: ofiloti@unh.edu
>
> On Tue, 8 Oct 2002, Tancredi Botto wrote:
>
> >
> > Hi tavi, as we were discussing with john yesterday we will install new
> > attenuators at some time. First I want to find an efficient setting
> > then characterize pulse height with cosmics. Then we will install
> > attenuators to match the flasher light.
> >
> > Have you found the reference cards for each pmt ? can make a list on
> > a piece of paper ? thanks
> >
> > -- tancredi
> > ________________________________________________________________________________
> > Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124
> > research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> >
> > On Tue, 8 Oct 2002, Octavian F Filoti wrote:
> >
> > >
> > > Hi Tancredi,
> > >
> > > The new attenuators for CC are done and I am planning to install them on
> > > Wednesday! They are 1.5 inch bigger and much better threads than the ones
> > > we have been using so far!
> > > I have been working at the gain-matching program tonight and is already
> > > done (though is more time consuming than the one I used before, since I
> > > have had to replace the part that uses libMyRC.so & libHV.SO,
> > > momentarily).
> > > I am also planning on Wednesday to take some flasher data for further
> > > analysis!
> > >
> > > -----------------------
> > > Octavian F Filoti
> > > Nuclear Physics Group
> > > Univ. of New Hampshire
> > > 9 Library Way
> > > Durham, NH 03824
> > > phone: (603)862-1691
> > > FAX: (603)862-2998
> > > email: ofiloti@unh.edu
> > >
> > >
> >
>



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