[Halld-cal] Draft level 5 CR for Bcal and Fcal activities

[Elton Smith]

HI Christina,

Sorry for the confusion. The units of the schedule are weeks, and it is
assumed that 44 working weeks is a year (takes account of holidays, sick
leave, etc).

Float is the amount of time that an activity has before any further delays
start impacting the overall schedule. For example, if there is an activity
that takes 2 weeks and it must completed before other activities that
start in 5 weeks, then the first activity has 3 weeks of "float". It also
means that if that activity is delayed by 3 weeks it will not impact the
start of the successor, but if it is delayed by 4 weeks, the successor
will be pushed back by 1 week.

For the Fcal monitoring system, specifically, it currently has 83 weeks of
float (i.e. it is currently scheduled 1.9 years before it begins to impact
successor activities). The proposal is to delay its start by 48 weeks (a
little over one year) till FY 2011 (fall of 2010). With this change, the
activity wil still have 35 weeks of float left, which is some insurance
that even if it takes a little longer to complete than projected, we can
still be confident that it will be completed in time.

Let me know if you still have questions about how we propose to change the
schedule.

Thanks, Elton.



Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave
Suite # 16
Newport News, VA 23606
elton at jlab.org
(757) 269-7625
(757) 269-6331 fax

On Tue, 6 Oct 2009, Christina Kourkoumeli wrote:

> Dear Elton and Matt,
> sorry for not answering before but I  simply do not understand enough to
> give a resonable answer.What "float" does it mean?Does "delay+24" mean
> that it will take 24 moths for completion?Anyway if it looks reasonable to
> others,I agree too.
>                               Cheers,
>                               Chrisine
> >
> > Hi Matt and Christina,
> >
> > Below are the proposed schedule changes to the Fcal and Bcal activities to
> > implemented in a change request this month. Please comment.
> >
> > -------------------------------------------------------------------------
> > We would like to adjust the schedule for some activities (no change in
> > cost), which are indicated below. I briefly spoke to Pat and he quickly
> > checked that there would be no obvious impact on successor activities with
> > the proposed changes. This of course should be verified with a "what if"
> > schedule. We would like to implement the CR this month to avoid starting
> > the Fcal monitoring activity (15222080), which is currently scheduled to
> > start in October 2009.
> >
> > Activity    Name              Float    Change
> > 15221155    Winston Cones     39       delay +24
> > 15221170    Signal Cables     47       delay +24
> > 15221171    HV SiPM Cables    49       delay +24
> > 15221172    HV PMT Cables     49       delay +24
> > 15221173    Light Guides      80       delay +24
> >
> > Justification: Will require time to finalize adjustments to Bcal readout
> > once final decision is made.
> >
> > Activity    Name              Float    Change
> > 15222080    Fcal Monitoring   83       delay +48
> >
> > Justification: Will require feedback from Fcal module fabrication contract
> > to define interfaces for monitoring of the lead glass.
> > ---------------------------------------------------------------------------
> >
> > Elton Smith
> > Jefferson Lab MS 12H5
> > 12000 Jefferson Ave
> > Suite # 16
> > Newport News, VA 23606
> > elton at jlab.org
> > (757) 269-7625
> > (757) 269-6331 fax
> >
> >
>
>
>