1. SiD Collaboration Meeting
Issues concerning the HCAL
Are we ready to optimize the SiD00 design?
What to do about the electronic readout of the HCAL prototype section?
José Repond
Argonne National Laboratory
SiD Collaboration Meeting
FNAL
16 – 17 December, 2005

2. Status of PFA Development
Best resolutions obtained with SiD baseline detector so far
Tests with Z0 → qq(uds) at the pole
Perfect PFA
→ no confusion assigning hits to tracks or neutrals
True PFA
→ minimal cheating (no tracking, only barrel events)
2 Gaussian fit
2 Gaussian fit
σ1 = 2.2 GeV
Fraction ~ 66 %
σ1 = 3.7 GeV
Fraction ~ 64 %
σ2 = 5.5 GeV
Fraction ~ 34 %
σ2 = 9.4 GeV
Fraction ~ 36 % W±
S Magill et al.

3. L Xia Perfect PFA True PFA
σ2 = 5.3 GeV
Fraction ~ 21 %
σ1 = 2.3 GeV
Fraction ~ 79 %
2 Gaussian fit
Perfect PFA
→ no confusion assigning hits to tracks or neutrals W±
True PFA
→ minimal cheating (no tracking, no γ ID)
2 Gaussian fit
σ1 = 3.1 GeV
Fraction ~ 57 %
σ2 = 8.9 GeV
Fraction ~ 43 %
L Xia

4. Further improvements to the algorithms
Magill
Implement NN for neutral ID
Compare performance of cluster algorithms → choose best
Apply to more complicated events (WW, ttbar…) and retune
Xia
Identify γ clusters within charged clusters
Implement γ ID
Implement jet algorithm
Further explore E/p cuts
Time scales between 1 – 3 months

5. So, are we ready to optimize the design?
Not quite
Hopefully will be much further in 1 – 3 months
Should we do detector design comparisons now?
Yes, but maybe not with high priority

6. Electronic Readout of the HCAL
Reminder: readout of test beam prototype
no ambition to design system for ILC (>2018)
DCAL chip
KPix chip
Number of channels 64
1024
Cost of chip
$150k + $50k
($150k) + $95k
Status of chip
First tests ongoing
2nd iteration needed (no major changes)
First version with 64 channels in hand
At least one more iteration before design of full chip
Challenges of chip
None
Complexity, power pulsing
Ready for production
6 – 8 months ?
Cost of multiplexer
$131k + contingency
$15k + contingency
Readout board: transfer lines
Cross-talk suppression
Some
Multiple hit measurements
(rare occurrence in had showers) No
Possible?