Transcript Document

JRA1
WP2
Development of a standard
library of background
simulation codes
Special Cross-links
JRA1-WP2
Development of a standard
library of background
simulation codes
JRA2(IDEA)
WP3-B1
N3-BSNS
Background
Simulation,
Neutron-Shield
and Muon-Vetos
18/07/2015
Study on
Cosmogenic
Induced Activity
Modane_Jan05
Gloria Luzón (LSC)
Milestones
and
deliverables
Tasks
Planning for the first year
18/07/2015
• Existing codes compared and discussed.
• Platform, language and structure of the library
fixed.
• First set of MC codes for relevant background
components and instrumentation ready.
• First “test” version of MC libraries
implemented.
• Technical report prepared.
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Progress of the work
 Task A: Existing codes compared and
discussed.
 Task B: Platform, language and structure of the
library fixed.
 Task C: First set of MC codes for relevant
background components and instrumentation
ready.
Task C: First set of MC codes for
relevant background components
and instrumentation
Alpha, beta and gamma.
Muons and neutrons.
Other codes.
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Alpha, beta and gamma
background
Widely used
GEANT4
Advanced example for
underground physics
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Neutron background
rock
activity
Rate and
spectrum
for 238U
fission and
(a,n)
Theory
Calculation
SOURCES
18/07/2015
Measurement
n at lab
n flux and
spectrum
at lab
FLUKA
MCNP
GEANT4
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counting
rates at
detector
FLUKA
MCNP
GEANT4
Muon induced neutron background
muons
Flux and
spectrum
for muons
underground
Calculation
MUSIC,
MUSUN,
SIAM,
FLUKA
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Measurement
muons at lab
Flux and
spectrum
of induced
neutrons
FLUKA
modified GEANT3
GEANT4
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counting
rates at
detector
MCNP
GEANT4
GEANT3
FLUKA
Other codes
• Cosmogenic induced activity
IDEA web- page
http://idea.dipscfm.uninsubria.it/
18/07/2015
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Gloria Luzón (LSC)
Task A: comparison of codes
Comparison experimental results.
Comparison of codes.
Modifications to codes.
18/07/2015
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Comparison experimental results
• Published neutron flux measurements at Gran Sasso,
Modane, Canfranc, CPL (Korea) and others.
• Measurements of muon-induced neutrons at various
depths underground: neutron yields, energy spectra,
lateral distributions etc.: LVD, KARMEN, LSD etc.
• Measurements of muon-induced neutrons using
active vetoes for dark matter detectors (existing and
planned): Canfranc, Modane, Boulby, Gran Sasso.
• Planned background flux measurements at Gran
Sasso, Modane, Canfranc, Boulby as proposed in
JRA1 (ILIAS).
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Gloria Luzón (LSC)
Comparison of codes
• MCNP and GEANT4
– Neutrons from rock, propagation and detection.
– Need of a comparison using the same geometry and incident
spectrum.
• Modified GEANT3 and FLUKA
– Muon-induced neutrons  good agreement.
• GEANT4 and FLUKA
– Muon-induced neutrons: yield, spectrum, lateral
distribution, and dependence with material.
– Comparison of different models of the codes.
– Higher production with FLUKA in most materials.
• GEANT4 and FLUKA
– Sea-level neutrons.
– GEANT4 shows an underproduction.
• MUSIC, MUSUN, SIAM and FLUKA ?
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Modifications to codes
• SOURCES
– Removal of the 6.5 MeV upper limit for
alphas.
– New cross-section added and some cross
sections updated according to data.
• GEANT3
– Correction for photonuclear cross-section.
– Good agreement with FLUKA results.
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Task B: Platform, language and
structure of the library
Structure of the library.
Web page and ftp-site.
Further discussion.
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Structure of the library
• General information about codes and
links to code web-site.
• Modifications to codes.
• Library of examples utilized by
Underground groups.
Under password
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Web page and ftp site
• The web page for the working group is
located at the main JRA1 site
http://www.unizar.es/ilias
• It contains
– information about the code comparison and
“evaluated” results.
– A code ftp repository containing modified
programs and examples.
– Links to WP1, WP3-4 for data.
– List of publications.
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Further discussion
• Today is a good opportunity to talk
about this subject.
• Any comment/suggestion will be
welcome.
• We should dynamize the distribution list
devoted to simulations.
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Gloria Luzón (LSC)
Milestones and deliverables
of the first year
First “test” of MC libraries.
ftp repository.
Technical Report.
Publications
First “test” of MC library
• We have identified the tasks for which each
code is suitable.
• We have compared simulations results of
different codes .
• We have reported on problems, bugs and
open questions.
• Important meeting held in Edinburgh last
September.
• A Mid-term report was sent to JRA1
coordinator.
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FTP repository
• We accept any suggestion about this
site.
• Please send a message asking for the
password to [email protected]
18/07/2015
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Technical report
• A technical report is under preparation.
• We have examined
– Physic models (specially for neutrons and
muons): processes, data libraries, energy
ranges, …
– Geometry capabilities.
– Biasing options (to save CPU time)
– Energy detection capabilities: nuclear recoil?
– Support, availability of code source
– Comparison to experiments
–…
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Publications

H. Wulandari et al. Proceedings of IDM2002.

G. Chardin and G. Gerbier. Proceedings of IDM2002.

V. Kudryavtsev et al. Proceedings of IDM2002 (York, UK, 2-6 September 2002),
p. 476.

V. A. Kudryavtsev et al. NIM in Phys. Res. A, 505 (2003) 688.

G. Gerbier et al, Nucl. Phys. B (Proc. Suppl.) 138 (2005) 59-64.

S. Cebrian et al, Nucl. Phys. B (Proc. Suppl.) 138 (2005) 65-67.

H. Wulandari. PhD thesis – TUM (2003).

H. Wulandari et al, hep-ex/0401032

J. M. Carmona et al. Astr Phys. 21 (2004) 523..

M. J. Carson et al. Astr. Phys. 21 (2004) 667.

H. Wulandari et al, Astrop. Phys 22 (2004) 313.

P. F. Smith et al, Astrop.Phys. 22 (2004) 409.
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H. M. Araujo et al, submitted to Nucl. Instrum. Meth.
A, hep-ex/0411026
G.Luzón. Talk at IDM-2004; see IDM-2004 web-site.
H. Mengetti. Talk at IDM-2004; see IDM-2004 web-site.
C. Cozzini. Talk at IDM-2004; see IDM-2004 web-site.
J. McMillan. Talk at IDM-2004; see IDM-2004 web-site.
H. Wulandari . Talk at IDM-2004; see IDM-2004 website.
S. Scholl. Talk at IDM-2004; see IDM-2004 web-site.
M. Bauer. Talk at IDM-2004; see IDM-2004 web-site.
M. Carson. Talk at IDM-2004; see IDM-2004 web-site.
J. Davies. Talk at IDM-2004; see IDM-2004 web-site.
H. Araújo and V. Kudriavtsev. Talk at IDM-2004; see
IDM-2004 web-site.
V. Kudriavtsev. Talk at LBT (SNO).
18/07/2015
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Plan of work for the next months
Comparison to experimental data.
Benchmarks.
Next simulation meeting JRA1(WP2)N3(BSNS).
Comparison experimental data
• To compare, if possible, simulation
results of each code with available
experimental data.
• To use the JRA1-WP1, WP3-4 data on
background contributions to compare
with codes simulations.
18/07/2015
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Gloria Luzón (LSC)
Inputs for the simulations: from JRA1/N2
rock
activity
Rate and
spectrum
for 238U
fission and
(a,n)
Theory
Calculation
SOURCES
18/07/2015
Measurement
n at lab
n flux and
spectrum
at lab
MCNP
GEANT4
Modane_Jan05
Gloria Luzón (LSC)
counting
rates at
detector
MCNP
GEANT4
Outputs from the simulations: to check
rock
activity
Rate and
spectrum
for 238U
fission and
(a,n)
Theory
Calculation
SOURCES
18/07/2015
n flux
and spectrum
Measurement
before
n atdetector
lab
n flux and
spectrum
at lab
MCNP
GEANT4
Modane_Jan05
Gloria Luzón (LSC)
counting
rates at
detector
MCNP
GEANT4
Outputs from the simulations: to check
muons
Flux and
spectrum
for muons
underground
Calculation
MUSIC,
MUSUN,
SIAM,
FLUKA
18/07/2015
nMeasurement
yields
n flux and spectrum
muons at lab before detector
Flux and
spectrum
of induced
neutrons
FLUKA
modified GEANT3
GEANT4
Modane_Jan05
Gloria Luzón (LSC)
counting
rates at
detector
MCNP
GEANT4
GEANT3
FLUKA
Benchmark
• Could we fix a few benchmarks?
• The distribution list can be used with
this goal.
Group
LSC
…
18/07/2015
Process
(n, 2n) in
shielding
materials
…
codes
FLUKA,
GEANT
…
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Exp.
CAST
(TPC
chamber)
…
Next meeting on simulation
activities.
• To be held in Valencia (SPAIN) in
March.
• Fixed date?
18/07/2015
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Gloria Luzón (LSC)