sPHENIX HCal discussion

[John Haggerty <haggerty AT bnl.gov>]

Edward,

We should discuss this in the HCAL meeting, I agree.

But a couple of points people made to me:

- Megan points out that we could spin around a group of tiles without 
the steel more easily than the HCAL prototype.  You might want to do 
that with the CAEN 5702, even.

- I would point out that we need some simulation to compare to in any 
case; it's not so complicated, but we need to account for the angular 
distribution of cosmics.

- Richie points out that you can buy an IHCAL spinner at Home Depot:

> http://www.homedepot.com/p/Big-Red-1-250-lb-Engine-Stand-T25671/100595181


On 6/12/17 12:23 PM, Edward Kistenev wrote:
> Hi, John,
> I talked to Richie in the corridor, he claims that design of the  table which 
> allows rotating HInner for 360 deg’s is made by Chris and is ready to go to 
> the shop this week. If I missed it - still great but if it was never 
> discussed in the group - why don’t we do it this week in the HCal meeting.
>                         Edward
>
>
> On Jun 12, 2017, at 11:09 AM, Edouard Kistenev <kistenev AT bnl.gov> wrote:
>
> John, this is great but the novelty of this setup is limited to new 
> electronics not to calorimeter itself.
> For two years I am wandering around begging to design and build a very simple 
> support stand which will allow for rotating the prototype around horizontal 
> axis (estimates converge around 2 months time to design/order and assemble) - 
> at some time it almost started but … no enthusiasm from project management 
> was always able to kill the idea. Maybe the move to HCal lab will help to 
> revive it - it is something really important. At this moment we have little 
> or no idea of how the calibration will change when towers are repositioned to 
> their final destination and will calorimeter modules in some peculiar 
> orientation (vertical axis) be able to produce enough of measurable signals 
> for triggering or trigger must be correlated between Outer/Inner and emcal.
>                         Edward
>
>
> > On Jun 12, 2017, at 9:14 AM, John Haggerty <haggerty AT bnl.gov> wrote:
> >
> > Anthony and I set up the Inner HCAL (which is now in the HCAL lab) to take 
> > cosmics on Friday and we took a few runs over the weekend.
> >
> > Some other notes and remarks:
> >
> > - Taking cosmic data pointed out to me that I didn't stretch the trigger 
> > input to the GTM when I set it up, and since the trigger input is re-clocked 
> > to the 10 MHz clock in the GTM, it misses trigger inputs in where there is no 
> > overlap between the input and the clock; the effect of that is that the 
> > triggers are still random, but you don't get as many as you could.  I 
> > stretched the signal so it's 120 ns long.
> >
> > - We were running out of room in
> > /sphenix/data/data01/caladc
> > at RCF where we stash the data, so Chris gave us space in
> > /sphenix/data/data03/phnxreco/
> > and I moved all the stuff that used to be on data01 to there.  Probably I 
> > could just delete it, but I thought we'd keep it around for a while.
> >
> > - There are two files of cosmics (about 3500 events) in
> >
> > > /sphenix/data/data01/caladc/hcallab
> >
> > with 14 bit goodness; we tried to keep the channel ordering the same as 
> > before (64-95), but the high and low gain channels are switched around (for 
> > the afficionados, we needed to reverse the polarity of the signal relative to 
> > what we had in the HBD electronics, so we flipped the slice on the preamps, 
> > which switches even and odd).  The good stuff is here:
> >
> > > cosmic_2017_06_09_17_14.prdf
> > > cosmic_2017_06_11_16_32.prdf
> >
> > triggered by paddles under "column 0" of the Inner HCAL.
> >
> > --
> > John Haggerty
> > email: haggerty AT bnl.gov
> > cell: 631 741 3358
> > _______________________________________________
> > sPHENIX-HCal-l mailing list
> > sPHENIX-HCal-l AT lists.bnl.gov
> > https://lists.bnl.gov/mailman/listinfo/sphenix-hcal-l


--
John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358