1. AIMS 1- Build SDHCAL prototype of 1m3 as close as possible to the one
we propose in ILD LOI
- Detectors : High efficiency and homogeneity
low cost, negligible dead zones
-Mechanical structure : Self-supporting
-Electronics readout : semi-digital, low consumption
Establish a realistic calibration procedure before and after
construction :
charge injection, cosmics
3 Test the power pulsing
Perform simulation study :
- Realistic detector
-optimize PFA with
1cm2 granularity, semi-digital readout
-study relevant physics processes

2. Groups
France : IPNL, LAL, LLR, LPC
Russia : IHEP-Protvino
Spain : CIEMAT
Belgium : Louvain-La-Neuve, Ghent
China : Tsinghua
Tunisia : Tunis
Collaboration with: CERN-Bologna (MGRPC)
LAPP(DIF)

3. scintillator
Single particle
Jet
KEK(Matsunaga et al)
Gas(GRPC)
dE/dX
Single particle
charge

4. GRPC for the SDHCAL
Thickness of few millimeters to reduce the coil cost
Efficient, Homogenous, cheap and easy to build
Cathode coating
Glass plate (1.1mm)
Chamber wall (1.2mm)
Spacer (fishing lines)
Glass plate (0.7mm)
Anode coating
Insulation (Mylar)
Pads (copper, 1 cm2)
PCB
ASIC
Gas

5. 1m2 Project Spacers: Replacing fishing lines with ceramics mini balls
to reduce dead zone
Deformation<40µ

6. 1m2 Project
Gas distribution : using channeling to distribute gas evenly
 More efficient gas renewal  less gas consumption
Max Velocity 1 mm/s

7. 1m2 Project
Resistive coatings: select the most appropriate painting which provides the
lowest pad multiplicity and the highest efficiency
Silk-Screen printing: Provides homogenous and well controlled coating

8. Aging, environment studies going on at GIF@CERN

9. Electronics for GRPC-SDHCAL
4.7 mm
4.3mm
Electronics for GRPC-SDHCAL
ASICs : HARDROC1(2)
64 channels
2(3) thresholds
Range: 10 fC-10pC
Gain correction  uniformity
Power-pulsed consumption< 10µW/ch
(0.5% duty cycle), X-talk < 2%
30 fC
10 fC
Piedestal
DAC output (Vth)
Trigger
25 µs

10. DAQ Schematic view LDA ODR PC DAQ for m3 HDMI USB USB Web browser USB
DIF supervisor
Event builder
Storage
DHCAL slab
DIF
USB
DIF supervisor
DHCAL slab
DIF
UI manager
USB
Web browser
DIF supervisor
DHCAL slab
DIF
Online monitor
USB
Main FSM
DAQ software (Xdaq framework)
CMSILC 10

12. The 1m2 project 12

13. Efficiency in two different zones of the detector13

14. The 1m3 project Self-supporting mechanical structure Beam
gas
DIF
H.V
Beam
DIF
DIF
gas
Services: DIF,HV,Gas

16. The 1m3 project
Robot to test the 8000 ASIC’s
(CMSILC transfer)

17. Thin (0,8mm) Semiconductive glass
Do we need high rate for ILC?
Float glass : 1013 Ω.cm  GRPC rate detection < 100 Hz/cm2
Semi-conductive glass 1010 Ω.cm 
GRPC rate detection > 10 KHz/cm2 (high efficiency)
Thin (0,8mm) Semiconductive glass
Thick(1,1 mm)
Semiconductive
Glass

18. Hadronic showers Beam Comparison data/simulation of
GRPC 1
GRPC 2
GRPC3
GRPC4
Beam
GRPCs
Comparison data/simulation of
shower development, and
energy deposition in the mini DHCAL
Muon contamination area 18 18