FoCal

 

The forward electromagnetic and hadronic calorimeter (FoCal) is an upgrade to the ALICE experiment, to be installed during LS3 for data-taking in 2027–2029 at the LHC. The FoCal is a highly granular Si+W electromagnetic calorimeter combined with a conventional sampling hadronic calorimeter covering pseudorapidities of 3.4<η<5.8. The FoCal provides unique capabilities to measure small-x gluon distributions via prompt photon production and will significantly enhance the scope of ALICE for inclusive and correlation measurements with mesons, photons, and jets to explore the dynamics of hadronic matter at small x down to about 10-6.

The FoCal-E detector will consist of a Si+W sampling calorimeter hybrid design using two different Si readout technologies:

  • Pad layers, with transverse cell sizes of ≈ 1cm2 
  • Pixel layers, with digital readout and a cell size of ≈ 30×30μm2.

All layers will consist of W sheets of ≈ 1X0 followed by silicon sensors. The figure schematically shows the FoCal-E structure with 18 pad layers and two pixel layers, positioned at the 5th and 10th layer.

The electromagnetic calorimeter of FoCal will be complemented with a hadronic calorimeter (FoCal-H), which is needed for photon isolation and jet measurements.

 

FOCAL in the News

Documents

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Coordinators:

Participating institutes

Representatives

University of Bergen, Bergen, Norway

D. Röhrich

Lawrence Berkeley National Laboratory, Berkeley, USA

P. M. Jacobs

Institute of Physics, Bhubaneswar, India

P.K. Sahu

Bose Institute, Kolkata, India

S.K. Prasad

National Research and Innovation Agency, Jakarta, Indonesia

S. Sumowidagdo

Chicago State University, Chicago, USA

E. Garcia-Solis

China Institute of Atomic Energy, Beijing, China

X. Li

Creighton University, Omaha, USA

J. Seger

Kolkata University, Kolkata, India

A. Chakrabarti

Gauhati University, India

B. Bhattacharjee

Helsinki Institute of Physics, Helsinki, Finland

S.S. Räsänen

Hiroshima University, Hiroshima, Japan

K. Shigaki

University of Houston, Houston, USA

R. Bellwied

Western Norway University of Applied Sciences, Bergen, Norway

H. Helstrup

Indian Institute of Technology Bombay, Mumbai, India

B.K. Nandi

Indian Institute of Technology Indore, Indore, India

R. Sahoo

Jammu University, Jammu, India

A. Bhasin

Jadavpur University, Kolkata, India

M. Mondal

University of Jyväskylä, Jyväskylä , Finland

S.S. Räsänen

University of Kansas, Lawrence, USA

J.D. Tapia Takaki

Inst. of Nucl. Physics, Polish Academy of Sciences, Krakow, Poland

J. Otwinowski

Kumamoto University, Kumamoto, Japan

Y. Osana

Nagasaki Inst. of Applied Science, Nagasaki, Japan

K. Oyama

Nara Women’s University, Nara, Japan

M. Shimomura

Niels Bohr Institute, Copenhagen, Denmark

I. Bearden

Nat. Inst. of Science Education and Research, Bhubaneswar, India

B. Mohanty

Oak Ridge National Laboratory, Oak Ridge, USA

C. Loizides

University of Oslo, Oslo, Norway

T. Tveter

Panjab University, Chandigarh, India

L. Kumar

Institute of Physical and Chemical Research, Wako, Japan

Y. Goto

Saga University, Saga, Japan

T. Fusayasu

Universidade de Sao Paulo (USP), Sao Paulo, Brazil

M. Munhoz

epartment of Physics, Sejong University, Korea

S. Oh

Faculty of Physics, Sofia University, Sofia, Bulgaria

V. Kozhuharov

Center of Nuclear Study (CNS), Tokyo, Japan

T. Gunji

University of Tsukuba, Tsukuba, Japan

T. Chujo

Tsukuba University of Technology, Tsukuba, Japan

M. Inaba

Universidade Federal do ABC, Santo André, Brazil

M. Cosentino

Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil

M.B. Gay Ducati

University of South-Eastern Norway, Konsberg, Norway

J. Lien

Variable Energy Cyclotron Centre, Kolkata, India

Z. Ahammed

Warsaw University of Technology, Warshow, Poland

L. Graczykowski

Wigner Research Centre for Physics, Budapest, Hungary

G. Barnaföldi

Central China Normal University (CCNU), Wuhan, China

Z. Yin

Yonsei University, Seoul, Korea

Y. Kwon

 

FOCAL Testbeam setup

FOCAL detector setup in 2023 testbeam!

 

FOCAL 2

Sketch of FoCal-E, showing 20 layers of W (each 3.5 mm thick) and Si sensors. There are 18 layers consisting of pad sensors with 1 cm2 area (low granularity cells, denoted as LG) and two layers, at positions 5 and 10, consisting of pixel sensors with much finer granularity (high granularity cells, denoted as HG). Each layer can be read out individually.

 

FOCAL 3

Sketch of FoCal-E and FoCal-H. The rectangular opening in the middle (84×84 mm2) accommodates the beam pipe. The horizontal space visible between the FoCal-E modules is due to the cooling plates. The readout for FoCal-E is on the detector sides, while for FoCal-H it is at the back of the detector. Dimensions are given in mm.

 

FOCAL 5

The final prototype of FoCal-E and FoCal-H tested at the SPS in the fall of 2022 and May of 2023.