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Semi-Digital Hadronic Calorimeter


One of the innovative concept to be fully tested by the CALICE collaboration is the one of a semi-digital hadronic calorimetry where the deposits from the hadronic showers are recorded with a fine (1×1 cm² cells, 40-50 layers) granularity with only a coarse energy information (2 - 3 thresholds). Based on gaseous sensor (GRPC or MICROMEGAS chambers) the proposed detector also includes, for the first time memory capable and power pulsed embedded readout chips.

This page present the effort of the groups toward the construction and beam test of a full 1 m³ prototype, including most of the dependancies implied by the running at the ILC, totalling 400000 channels.



One possibility for a gaseous HCAL active medium is the Micro Mesh gaseous structure (MICROMEGAS), a detector based on the micro-pattern detector technology, today widely used by many experiments: COMPASS, CAST, NA48, n-TOF, T2K and the ILC TPC project. First prototypes consist of a commercially available fine mesh which separates the drift gap (3 mm) from the amplification gap (128 μm). This simple structure allows full efficiency for MIPs and thanks to thin pillars, provides a good uniformity over the whole surface. The rate obtained with Micromegas chamber is not constrained, as it is the case for the Glass RPC. Moreover the tiny size of the amplification avalanche, results in fast signals without physical cross talk and leads to low multiplicities. The chosen bulk technology based on industrial PCB processes, offers a robust detector with no working voltages higher than 500 V. MICROMEGAS are therefore a very appealing possibility to equip a DHCAL optimized for the PFA. Reference Paper : MICROMEGAS chambers for hadronic calorimetry at a future linear collider C Adloff et al 2009 JINST 4 P11023



Very Front-end Electronics

The readout will be done with embedded HARDROC or DIRAC able to store the hits above 3 thresholds for 64 channels with very low consumption (using power pulsing techniques)

Digital Interface Electronics

  • DIF: Digital InterFace board
  • DCC: Digital Concentrated Card
  • LDA: Link-Data aggregator

Data Acquisition

  • ODR: Off-Detector Receiver
The presentation of the SdHCal can be found here;

The DIF Geometry file (May & August ) : Slot1_39_Geom.txt

The Trivent Documetation : Trivent_user_manuel.pdf

Presentation in conference.

ILC dependancies

  • low consumption
  • Zero suppression
  • Differed readout
  • Excellent geometric resolution, suitable for the PFA techniques adopted by the ILD and SiD concepts.

Implied Groups

Group People
IPNL - Lyon Christophe Combaret
Gérald Grenier
Robert Kieffer
Imad Laktineh
Nick Lumb
Laurent Mirabito
Muriel Vander Donct
Florent Schirra
CIEMAT - Madrid Mary-Cruz Fouz Iglesias
Enrique Calvo Alamillo
Jesus Puerta-Pelayo
Jorge Berenguer Antequera
IHEP - Protvino  
LAL - Orsay  
LAPP - Annecy Catherine Adloff
Jan Blaha
Sébastien Cap
Maximilien Chefdeville
Alexandre Dalmaz
Cyril Drancourt
Ambroise Espagilière
Renaud Gaglione
Nicolas Geffroy
Claude Girard
Jean Jacquemier
Yannis Karyotakis
Fabrice Peltier
Julie Prast
Jean Tassan
Guillaume Vouters
LLR - Palaiseau Vincent Boudry
Khaled Belkadhi
Rémi Cornat
David Decotigny
Franck Gastaldi
Manqi Ruan
Yacine Haddad


Hadronic RPC Detector ReadOut Chip, a very front-end readout chip
DIRAC: DIgital Readout Asic for hadronic Calorimeter, a very front-end readOut chip

-- VincentBoudry - 12 Sep 2008

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PDFpdf Trivent_user_manuel.pdf r1 manage 475.5 K 2012-09-16 - 00:39 HaddadYacine  
Texttxt Slot1_39_Geom.txt r1 manage 3.8 K 2012-09-13 - 10:49 HaddadYacine  
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Topic revision: r15 - 2012-09-16 - HaddadYacine
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