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.

List of Run used for the CALICE note CAN-037.

Beam Energy (GeV) Runs
7.5 715695
10 715692 , 715693
15 715699
20 714565 ,715675
25 715700 ,715703
30 714562, 715671 ,715747
40 714561, 715651 ,715748
50 715751, 715551, 715612, 715596, 715595, 715594, 715593 ,714556
60 715511, 715531 ,715753
70 714547, 715493 ,715754
80 14470, 715480, 715491 ,715756

low consumptionILC dependancies

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

Implied Groups

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


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

Topic attachments
I Attachment History Action Size Date Who Comment
Texttxt Slot1_39_Geom.txt r1 manage 3.8 K 2012-09-13 - 10:49 HaddadYacine  
PDFpdf Trivent_user_manuel.pdf r1 manage 475.5 K 2012-09-16 - 00:39 HaddadYacine  

This topic: CALICE > WebHome > CaliceDetectors > SdHCal
Topic revision: r17 - 2014-04-30 - MichaelTytgat
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