Hi John, Item in RED below has
been modified. Since there was such a delay in receiving the BC600
from St-Gobain, we borrowed a kit of Epo-tek 301-1 from the EMCal
people.
I got that expedited through the export control system Monday. It is
in the hands of Interfreight and should leave the US ASAP! I
will provide tracking #'s for fibers and epoxy when I get them!
On 5/20/2015 1:12 PM, John Lajoie
wrote:
Dear HCAL'ers:
In the morning session today we had a walkthrough of the major
items discussed during the workfest and a summary of the action
items. I've attempted to summarize these discussions and
explicitly list out action items below.
Once again, I'd like to thank our GSU hosts for their
hospitality - they make coming to Atlanta for these workfests a
real pleasure!
Light Collection/Tile Testing
------------------------------------
- Achim – ray trace simulations coupled to SiPM holder design
(iterate)
- JH - Send additional parts to Colorado (4 SiPMs with latest
production preamp boards), should be able to see single-pixel
hits (establish gain)
- Need to understand L/R response of small reference tile.
Trigger?
JH/EK – Need to get Bicron glue to
Uniplast before we can get 10-20 1m tiles (unpatterned, dual
glue tiles).
Largest extrusion from Uniplast currently 21cm (!) so need
to test dual, glued tiles.
- First general awareness of this issue at this meeting
- When will we ask Uniplast to toolup for full tile width?
- EK will talk with them early next week. Will this be an
NRE on the next order? How does this affect prototype lead
time?
- 3 month lead time required when ordering for prototype
assumed
Need to visit FNAL in near future, revisit Elgin quote? Due
diligence!
- JH will contact FNAL management about future of
scintillator facility and open discussions.
Calibrations/Monitoring:
---------------------------------
- 5 groups of 12 LED’s fired at a time, controlled by
interface board
- Steve/Eric charged with further development, LED selection
We now have a strawman calibration strategy (from John H’s
notes):
- Absolute tile calibration (tile + SiPM/holder) with
cosmics
- Implications for assembly procedure, must all be kept
together!
Module calibration with cosmics
Cosmics in full detector (rates? small signals?)
Need cosmics trigger algorithm (EK/JL)
Requires simulations for geometry AND solid test beam data
for h/m, etc.
- Will need a beam test of a final design. Will this be
the modules as tested at FNAL test beam next year? Might
not be, need a contingency plan!
Cosmics calibration between runs.
Within a run:
- LED for short-term variations
- Match with tracked particles to check calibration
Don’t expect this is final, but it is a plan we can start
from and evolve as we investigate each piece in detail
MC and HCAL response
-------------------------------
- HCAL response studies are time-critical for prototype
design! (see calibrations – the prototype MUST be the final
design)
- Liang/Xiaochun – Check tile grading response in prototype
MC!
- Can be done quickly, begin to understand main effects
- Lots of discussion, will not be perfect but will allow us
to get a first look at the effect on fluctuations
(resolution and tails!)
Partial framework already in place, need to extend (JL +
Liang +??)
- Birk’s law in place for EMCal, copy over?
- Need tile response in G4step
- Need to extend tower container to keep track of multiple
pieces of information
Achim - more realistic field map in outer HCAL
- First order – field in plates, none in scintillator
Simulation goals:
- Tile tilt angle (underway as part of Simulations meeting)
- Verify/optimize tile patterning to even out HCAL response
vs. shower depth.
- Verify calibrations scheme:
- Perform a blind calibration with cosmics, study
systematics, estimate statistics and time required.
Work with EMCal to optimize inner HCAL
- Not a choice for practical reasons?
What if we have no inner HCAL (room for EIC PID?)
Regards,
John Lajoie
--
John Lajoie
PHENIX Deputy
Spokesperson
Professor of Physics
Iowa State University
(515) 294-6952
lajoie AT iastate.edu
Contact me: john.lajoie
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