[Solid_ec] SoLID EC/DAQ meeting June 25th 2013 10:30 AM

[Alexandre Camsonne]

We will have the SoLID EC/DAQ meeting on June 25th 2013 10:30 AM.

I booked room F226 for people on site.

The ready talk number for US is : 1866 740 1260

Pass code is : 1186942

Send me a copy of your files if you want me to display them.

To see the share log at : www.readytalk.com

A summary of previous meeting ( all files can be found at :
http://hallaweb.jlab.org/12GeV/SoLID/download/ec/meeting/2013-06-18/
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Mike Paolone, Yuxian, JP, Alex, Rakitha,Rich Holmes, Paul Reimer, Zhiwen,
Jin, Paul Souder ( arrived at the end )

Mike ( Cerenkov update )
Still working on simulation
- most event have 2 PMT, peaks around 3 to 4
- check efficiency on sum of 9
- still need to evaluation of background :
contacted Maurizio for improving physics list ( Maurizio out of town )
--optical processes
--only old background processes which work with optical
- still need to check base design ( if active might add electronics noise )
still need to be defined
-checking background from GEMC at Cerenkov window is consistant with Zhiwen
and Seamus
( still discrepancies )
-will discuss with Zhiwen
Light Gas Cerenkov : talk DNP


Zhiwen ( Simulation check )
-He is back !
-baffles geometry : need to use new baffles, needs to crosscheck with
Seamus
-in contact with Seamus and Mike
-back July 11th
-response

Yuxiao
-got map calorimeter from Zhiwen and Paul

Paul Reimer
-Question from Zhiwen : drawing of calorimeter,
rails outer calorimeter not filled but they are
-12 sections : no fewer because of weight,more possible but increase cost

Richard Holmes :slides at
http://hallaweb.jlab.org/12GeV/SoLID/download/ec/meeting/2013-06-18/rsholmes_separation_update-June-18th-2013.pdf
Slide 4
Plots of photons origins hitting the GEM
Slide 5
iron of inner solenoid shields most of beamline background, most background
from target
baffles used are baffles 3.9 , latest from svn. Need to get the latest one
from Zhiwen
0 width vertex, odd source of electron, all electrons going in 4th gem and
in GEM, all momenta
space filled with air
Slide 8
electron background produced in GEM
Odd source in last baffle to be investigated
Paul find informative to generate r vs vz plots and 2D plot
though one needs to turn on storage of vertex information
Zhiwen will send last version of baffles
Conlusion :
As before, photons and electrons are localized at
well separated positions in 4th GEM
•Much poorer separation at 2nd GEM
• Isotropic photon background is small, and can
probably be reduced further

GEM : photon conversion discrepancy with SBS Zhiwen is looking into that


Alexandre
http://hallaweb.jlab.org/12GeV/SoLID/download/ec/meeting/2013-06-18/SolID-EC-DAQ-June18th-2013.pdf
http://hallaweb.jlab.org/12GeV/SoLID/download/ec/meeting/2013-06-18/SolID-EC-DAQ-June18th-2013.pptx

-Discussed with electronics group for selective FADC readout
-Upgrade event type to send FADC to be read out, need to develop FADC
readout
-Assuming 2 clusters per event this drops data rate to around 60 MB/s per
sector : only need one crate
-Cost down to around 3.5 M$ including spares
-Need to evaluate cost of L3
--assuming one sector is twice faster than Hall D gives a price of 1.8 M$
with tracking and 0.61 M$ without tracking for 20 KHz trigger rate. Cost
scales with rates so up to 5.4 M$ for 60 KHz with tracking. Most likely go
without tracking and rates with Cerenkov will be reduced
--need to evaluate strategy and speed of algorithm

Jin
-Question to Zhiwen : when new background simulation will be available ?
wait to resolve issues with Seamus
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