Transcript Status-report of the IHEP-Protvino group activity in the PANDA PWO

PANDA electromagnetic calorimeter session
IHEP activity in barrel
Alexander Vasiliev (IHEP-Protvino)
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
Content
Decree of Russian Government on participation of Russia in
FAIR and Rosatom ‘Scientific and Technical Council’ meeting
Rosatom Order on founding the Russian FAIR Scientific and
Technical Committee.
Status of the Bogoroditsk plant.
PWO radiation study facility at IHEP (Vasily Mochalov)
Mechanical design work (Andrei Levin)
Neutron irradiation of the PWO crystals and PWO induced
activity
Progress in carbon fiber technology at IHEP
Conclusions
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
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Anticipated Russian participation in FAIR
Decree of Russian Government on FAIR is signed by
V.V.Putin and officially published
(Number 245-р dated by February 27, 2010)
• Participation of Russia in FAIR in the frame of the
strategic partnership with Germany 
15% of the FAIR full cost,
which is 178 M Euro in 2005 costs
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
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Rosatom ‘Scientific and Technical Council’ meeting
Took place on February 10, 2010  “Role and
Participation of the Russian Institutes in FAIR”.
The FAIR Scientific Director Boris Sharkov made a
report on FAIR status at the meeting.
Decisions of the meeting important for PANDA were
taken:
STC recommended Rosatom to continue a financial support of
IHEP in the PANDA calorimetry R&D studies
STC recommended Rosatom to set up Scientific and
Technical Committee (STC) to coordinate the Russian
institutes
participation
in
FAIR
(accelerators
and
PANDA/CBM/NuSTAR/APPA)
Rosatom Order # 274 dated by April 9, 2010 – STC is
founded (15 members).
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
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Status of the Bogoroditsk plant
• The plant is in the process of bankruptcy.
• May – platinum will be taken to “Gochran”.
• June – the court will announce the plant as a bankrupt.
• “After that the plant will immediately start to be sell off by
pieces” – Director Alexei Baberdin.
• To save the plant – show the Protocol of Intent in May and
at the court in June. A specific date of a Contract signature
will have to be pointed out in the Protocol (Contract to
produce up to ~9,500 of last PWO crystals).
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
PWO radiation study facility at IHEP
Goal – long term (months!) continuous irradiation of
PWO crystals at negative temperatures
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
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Main parts of the irradiation experimental setup
Gamma source Co60(7x1012)
Crystal container
A.Vasiliev, IHEP-Protvino
neutron source (4 Pu-α Be)
Lauda cryothermostat
2-nd PANDA meeting in Russia, April 26-28, 2010
The neutron irradiation study
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Four Pu-α-Be sources were used for
irradiation study
Sources were placed in special
polyethylene collimator
Integral Nominal Intensity 1.9∙108
neutrons in 4π.
Measured fluence at crystal place (20 cm
from sources)
is ~3∙104
n/(cm2∙sec).
Calculated fluence (MCNP) ~4.2∙104
n/(sm2∙sec).
Dose rate of convoyed gammairradiation was ~70 mrad/h.
Neutron source
• Spectrophotometer will have to
be incorporated into setup
(instead of 450 nm and 640 nm 
330 nm – 1000 nm)
Crystal box
A.Vasiliev, IHEP-Protvino
LAUDA
2-nd PANDA meeting in Russia, April 26-28, 2010
Comparison of gamma and neutron irradiations
Luminiscence signal change
A.Vasiliev, IHEP-Protvino
Blue LED signal change
2-nd PANDA meeting in Russia, April 26-28, 2010
Comparison 2
• Plateau was not achieved after 300 hours of irradiation
Luminiscence signal change
A.Vasiliev, IHEP-Protvino
Blue LED signal change
2-nd PANDA meeting in Russia, April 26-28, 2010
Two papers are under preparation
• “Neutron irradiation”
• “Induced activity” – specific experiment was carried out
• Some PWO crystals (2.7x2.7x22 cm3) were irradiated near the
internal target of 70-GeV IHEP accelerator. Beam duration was
1 sec. Full cycle was 9 sec. Intensity was 5x1011 at the target.
• Time of irradiation was 200 sec and 150 hours to extract shortlived and long-lived isotopes.
• The mean energy of the secondary particles from the target was
several GeV. Wide set of the secondary particles.
• ~25 long-lived and ~30 short-lived radionuclides were identified.
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
PWO mechanical support carbon fiber technology at IHEP
Mould to produce carbon fiber prototype
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
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PWO mechanical support carbon fiber technology at IHEP
“Crystal” sizes are 27x27x250 mm3, an
accuracy of the mould production is 20 mkm.
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
4
PWO mechanical support carbon fiber technology at IHEP
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
4
PWO mechanical support carbon fiber technology at IHEP
Mandrel is to be wrapped by
carbon fiber raw material
(prepreg, 120 mkm), installed
into the mould and baked in
the furnace
A hole is for the temperature
monitor
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
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Unidirectional(UD)
Carbon fibers 3K
Thick-100 µm
Wide -300 mm,
CJSC "Prepreg",
Moscow, Russia
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
Cutting the strips 10 mm wide.
Winding around the mandrel butting the edges,
2 layers at an angle of 120° .
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
While assembling the mould, a gap of 200 µm is
provided between the mandrel and each of the
sides.
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
Curing (2 hours, 180°C)
Temperature monitoring of
mould at 2 points
Temperature
monitors
Temperature
sensor
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
Conclusions – the nearest plans
Try to solve the Bogoroditsk problem.
Incorporate spectrophotometer in the IHEP
irradiation facility and start up a long term
irradiation (~100 days) of several PWO crystals
with a PANDA dose rate at ~-200C.
A production of the first carbon fiber
prototype for PWO mechanical support has
started. Quality?
Make
mechanical
drawings
and
strength
calculations – two engineers (Andrei Levin and
Alexander Ryabov)
Finish up writing and submit two papers –
‘neutron irradiation’ and ‘induced activity’
A.Vasiliev, IHEP-Protvino
2-nd PANDA meeting in Russia, April 26-28, 2010
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