Advancements in Micromegas Detector Research Project

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Research and development
Research and development
of Micromegas detector and
of Micromegas detector and
related devices
related devices
(Project N° 4304-1)
(Project N° 4304-1)
Updated progress report and extension request
P. Colas, S. Mukhopadhyay
CEFIPRA Scientific Council,  Dinard, France, May 21, 2014
Updated report
What is a Micromegas Time Projection
Chamber?
Studies with small prototypes
The Large Prototype
Software studies, analysis of distortions
The PhD student Deb Sankar
Bhattacharya
Recent achievements
Plans
History of the project 4304-1
First meeting in Saclay in December 2008,
discussing possible collaborations
First travel from France to India in January
2010. Application to CEFIPRA.
Started April 1, 2011, due to end on March
31, 2014, extension to January 31, 2016.
Documents written : detailed project  March
2009, annual report from April 2011 to March
2012, mid-term report presented on Nov. 17,
2012 at the CEFFIPRA S.C. in Aurangabad,
the extension proposal in October 2013, this
updated progress report and extension
request.
Micromegas: How does it work?
Micromegas: How does it work?
Y. Giomataris, Ph. Rebourgeard,
JP Robert and G. Charpak,
NIM A 376 (1996) 29
Micromesh Gaseous Chamber: a micromesh
supported by 50-100 
m insulating pillars,
and held at V
anode
 – 400 V
Multiplication (up to 10
5
 or more) takes place
between the anode and the mesh and the
charge is collected on the anode (
one
one
stage
stage
)
Funnel field lines: electron 
transparency
transparency
very close to 1 for thin meshes
Small gap: 
fast
fast
 collection of ions
S2/S1 = E
drift
/E
amplif
 ~ 200/60000=
1/300
undefined
5
6
TPC: Time Projection Chamber
TPC: Time Projection Chamber
E
 
 
I
o
n
i
z
i
n
g
 
P
a
r
t
i
c
l
e
 
electrons are separated from ions
 
electrons diffuse and
drift due to the E-field
 
 
L
o
c
a
l
i
z
a
t
i
o
n
 
i
n
 
t
i
m
e
 
a
n
d
 
x
-
y
 
B
 
t
 
x
 
y
 
A magnetic field 
reduces
electron diffusion
Micromegas TPC : the amplification
is made by a Micromegas
Work with small prototypes
Full equipment of the
SINP lab for small
detector studies, and
procuration of
Micromegas detectors
by the Saclay team
Study of various gaps
and geometry and
comparison with
simulation
2 publications (NIM and
JINST)
Work with small prototypes
Ion backflow measurements in Saclay
with the Indian team.
New small TPC built at SINP
The student Deb Sankar
Bhattacharya
Joined SINP in January 2013
Registered in PhD at Jadavpur
University, with advisors S.
Mukhopadhyay, A. Bhattacharya
and P. Colas.
PhD to be defended in Kolkata, in
January 2016.
Fully payed on CEFIPRA funds
2013
2014
2015
SINP
SINP
SINP
Saclay
Saclay
The Large prototype
Built by LCTPC
collaboration
Magnet and
cooling plant by
KEK, Tsukuba
Equipped by
Saclay with
resistive anode
Micromegas.
Cooling tested in
February 2014
at DESY
Events in the Large Prototype
 
Analysis and software
‘Software week’ in
Saclay, where we
work on the track
reconstruction and
analysis.
Distortions from the Large
Prototype
Distortions from the Large
Prototype
Inhomogeneity of the
Electric field near the
edges of the modules
induces distortions (even
at B=0)
Also induces ExB effects
Changes in E also
changes the drift velocity
Add up to mechanical
misalignment
Detailed module edge layout
Distortions from the Large
Prototype
Inhomogeneity of the
Electric field near the
edges of the modules
induces distortions (even
at B=0)
Also induces ExB effects
Changes in E also
changes the drift velocity
Add up to mechanical
misalignment
Calculations by S. Mukhopadhyay
Conclusion
Lots of achievements after 3 years.
French funds not yet spent, but just
enough remains to pay salary and
expenses of D.S. Bhattacharya through
2015, mainly to study distortions in the
Large Prototype TPC
2 weeks in Kolkata for the French team,
end of October 2014: MPGD workshop
and teaching.
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Advancements in the research and development of Micromegas detectors and related devices are highlighted in this progress report and extension request. The project, initiated in April 2011, involves studies with small prototypes, software analysis, and significant achievements by the PhD student Deb Sankar Bhattacharya. Collaboration between France and India, along with equipment procurement and publications, have contributed to the project's success. Micromegas Time Projection Chambers, project history, and operational principles are discussed, showcasing the project's evolution and future plans for continued innovation.


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  1. Research and development of Micromegas detector and related devices (Project N 4304-1) Updated progress report and extension request P. Colas, S. Mukhopadhyay CEFIPRA Scientific Council, Dinard, France, May 21, 2014

  2. What is a Micromegas Time Projection Chamber? Studies with small prototypes The Large Prototype Software studies, analysis of distortions The PhD student Deb Sankar Bhattacharya Recent achievements Plans Updated report

  3. First meeting in Saclay in December 2008, discussing possible collaborations First travel from France to India in January 2010. Application to CEFIPRA. Started April 1, 2011, due to end on March 31, 2014, extension to January 31, 2016. Documents written : detailed project March 2009, annual report from April 2011 to March 2012, mid-term report presented on Nov. 17, 2012 at the CEFFIPRA S.C. in Aurangabad, the extension proposal in October 2013, this updated progress report and extension request. History of the project 4304-1

  4. Y. Giomataris, Ph. Rebourgeard, JP Robert and G. Charpak, S1 NIM A 376 (1996) 29 Micromesh Gaseous Chamber: a micromesh supported by 50-100 m insulating pillars, and held at Vanode 400 V Multiplication (up to 105 or more) takes place between the anode and the mesh and the charge is collected on the anode (one stage) Funnel field lines: electron transparency very close to 1 for thin meshes S2 S2/S1 = Edrift/Eamplif~ 200/60000= 1/300 Small gap: fast collection of ions Micromegas: How does it work?

  5. 5

  6. t electrons diffuse and Ionizing Particle drift due to the E-field electrons are separated from ions E B A magnetic field reduces electron diffusion y x Micromegas TPC : the amplification is made by a Micromegas Localization in time and x-y 6 TPC: Time Projection Chamber

  7. Full equipment of the SINP lab for small detector studies, and procuration of Micromegas detectors by the Saclay team Study of various gaps and geometry and comparison with simulation 2 publications (NIM and JINST) Work with small prototypes

  8. Ion backflow measurements in Saclay with the Indian team. Work with small prototypes

  9. New small TPC built at SINP

  10. Joined SINP in January 2013 Registered in PhD at Jadavpur University, with advisors S. Mukhopadhyay, A. Bhattacharya and P. Colas. PhD to be defended in Kolkata, in January 2016. Fully payed on CEFIPRA funds SINP Saclay SINP SINP Saclay 2014 2015 2013 The student Deb Sankar Bhattacharya

  11. Built by LCTPC collaboration Magnet and cooling plant by KEK, Tsukuba Equipped by Saclay with resistive anode Micromegas. Cooling tested in February 2014 at DESY The Large prototype

  12. Events in the Large Prototype

  13. Software week in Saclay, where we work on the track reconstruction and analysis. Analysis and software

  14. Distortions from the Large Prototype

  15. Inhomogeneity of the Electric field near the edges of the modules induces distortions (even at B=0) Also induces ExB effects Changes in E also changes the drift velocity Add up to mechanical misalignment Detailed module edge layout Distortions from the Large Prototype

  16. Inhomogeneity of the Electric field near the edges of the modules induces distortions (even at B=0) Also induces ExB effects Changes in E also changes the drift velocity Add up to mechanical misalignment Calculations by S. Mukhopadhyay Distortions from the Large Prototype

  17. Lots of achievements after 3 years. French funds not yet spent, but just enough remains to pay salary and expenses of D.S. Bhattacharya through 2015, mainly to study distortions in the Large Prototype TPC 2 weeks in Kolkata for the French team, end of October 2014: MPGD workshop and teaching. Conclusion

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