[Clas12_first_exp] No RC meeting Today

[Francois-Xavier Girod]

Dear all

During today's meeting I mentioned that we are currently running at 75%
tracking efficiency and that increasing the luminosity by 10% will actually
decrease the efficiency by 5% absolute and 7% relative. The problem I
personally see with this now is that 7% is a large number compared to
target systematics for cross sections. I was told that we already have
demonstrated that we can recover those 25% lost tracks.

Can someone please point me out to the evidence that shows that we are able
to recover the 25% of lost tracks at 50 nA?

Best regards
FX

On Thu, Nov 1, 2018 at 12:44 PM Latifa Elouadrhiri <latifa at jlab.org> wrote:

> Dear all,
>
> We are running smoothly since yesterday this morning we increased the
> current from 45 nA to 50 nA. The operator yesterday worked on the
> optimization of our beam-line reducing the rates on both our upstream
> and downstream halo counters therefore the  number of trips. Also this
> morning, working with the PD to address the issue of beam current
> spikes,  a trim card power supply was changed for the vertical wein,
> this should help clear up those current spikes we were seeing. We will
> keep monitoring, the beam stability.
>
> The plan for the next 24 hours is to continue production at 50 nA with
> no changes.
>
> Tomorrow we will have our joined RC/TCB meeting. We will send an agenda
> shortly.
>
> Best regards,
>
> Latifa
>
>
>
>
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