sPHENIX EMCal discussion

[John Haggerty <haggerty AT bnl.gov>]

On Monday, with a lot of effort from GSU, ISU, WSU, CU, BNL, and the 
ever-helpful test beam folks, we got the EMCAL moved downstream into its 
final position in front of the HCAL.  There are many pictures at the end 
of the album:

> https://goo.gl/photos/wJzu9KgkwbJHcdsj9

The move took longer than I expected, because we had to do a substantial 
amount of rearrangement of cables, and we took our time to do it 
carefully and had our ORC re-review on Tuesday morning.  We passed that 
with no problems, and resumed operation with the beam Tuesday morning. 
We checked that things look pretty much the same downstream as they did 
upstream, so we decided to take the first slug of energy scan data of 
all three calorimeters in their final configuration.  Abhisek and the 
whole crew here took energy scan data last night from 12 to 40 GeV so if 
we're hit by a meteor we have data with the whole detector.

So the things on my list of things to do are:

- do a nose-down calibration of the emcal in this position (this will be 
somewhat more laborious, since it will require 8 accesses, but I think 
we should confirm that the EMCAL is stable (I'll need guidance from Sean 
and Craig to do this)

- take HCAL data with EMCAL out of the way

- do a first pass on the tilemapper (that's going on now)

- we'll want to do another EMCAL energy scan, presumably after the 
calibration run

After we've seen some analysis results from these data, we will probably 
have to decide how to iterate this.

In general, we're in good shape--we have the early data we wanted to 
get, and we have two weeks to complete iterations on the data taking and 
analysis.

If you have suggestions, please post to the list.

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