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![Page 1: Study of Electromagnetic Interactions of Light Ions in the Framework of the IHEP Ion Program at U70 Serguei Sadovsky, IHEP, Protvino EMIN-2009, Moscow,](https://reader035.fdocuments.net/reader035/viewer/2022081603/5697bfa91a28abf838c9a102/html5/thumbnails/1.jpg)
Study of Electromagnetic Interactions of Light Ions in the Framework of the
IHEP Ion Program at U70
Serguei Sadovsky, IHEP, Protvino
EMIN-2009, Moscow, 19 September 2009
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Outlook
IHEP accelerators Positroniy channel Possible physics domains Conception of experimental setup Conclusion
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23 декабря 2008 Сессия-конф. СЯФ ОФН РАН 3
IHEP accelerators
U70 accelerator
Linac U30
Buster U1.5
Linac I100
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Linac for light ion acceleration: I100
p, d ion source
3 м
TOF:ЦФ
HV generatorUp to +750 кV
p N+, O+ N2+,O2
+
2008
N2+,O2
+
p d
100 ns
50 mА p
15 mА d 5 mks 16.7 MeV/n
2008
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Light ion source: I100 (laser source of 12C)
IHEP laser (CO2, 2.7 J, 10 m, 0.25 Hz) IGP of RAS laser (…, 10 Hz)
C+5
C+4
C+3
C+2
Рисунок 3
Beam of C5+
40 mA @ entry toI100
1.6 mA @ exit from I100
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Light ions: channel from I100 to U1.5
17.11.06: p 72.7 MeV 01.12.06: d 16.7 MeV/n
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Light ions: December 2008
d in U70 after 4 magnets
10–12.12.08; d; 16.7–> 455 MeV/n
April 2009: d-beam circulation in U70
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Ion beam extraction from U70
5 mm
5mm
Si crystal station
1.71013proton p (U30)
3109carbon 12C6+
11011 deuteron d
2-91011 proton p ( I100 )
NB0Ions in U70
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Proposal to study the ion beam extractions in «Positroniy» channel
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Experimental area of «Positroniy» channel: two beam magnets and one of two secondary targets are proposed to install, the available Z distance is 15 m
tg1tg2
M1M2
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Up to 106 12С/cicle in «Positroniy» channel is expected due to beam extraction with Si Crystal
Extraction efficiency is 0.1%
Crystal bended angle ~ 60 mrad
1.71013proton p
3109carbon 12C6+
11011 deuteron d
2-91011 proton p
NB0Ions in U70
Extraction efficiency vs banded angle
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Intensities of secondary radioactive beams in 12С fragmentation
The secondary beam optics allows to have beams of different radioactive nuclei
At the intensity of 12C
primary beam I=3·109
/cycle the fragment intensities variate from I=106 /cycle for 8Li and to I=104 /cycle for 8He
1,9E+069999512,3 y3H
1,9E+069949,55stable3He
1,9E+071326650stable4He
7,4E+05198992807 ms6He
1,3E+042641320,035119 ms8He
1,5E+06198664stable6Li
2,6E+06231777stable7Li
8,9E+05264882,4840 ms8Li
1,9E+05297990,5178 ms9Li
4,4E+0623157,751253 d7Be
3,7E+0629774,2510stable9Be
2,2E+0633082,561,6 106 y10Be
5,2E+0526452,81,4770 ms8B
1,4E+073306638stable10B
2,6E+0736372,670stable11B
7,4E+0429749,50,2126 ms9C
7,4E+0533055219,3 s10C
2,0E+0736360,55320,3 m11C
Ionsper cycle
Momen-tum(GeV/c)
Rigidity
GeV/c)
σ (12C + 12C) → fragment (mb)
Life- timefragment
Important: the fragments have different rigidity =>fragments identification with Spectroscopic magnet is possible
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Physics case 1: study of light nuclei at the limit of neutron stability
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Light nuclei beyond the neutron stability
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PHYSICS case 2: Nuclear Clastering of the 12С fragments, including short-leaved and exotics nuclei
9Li 178 ms 8Li 838 ms 6He 807 ms8He 119 ms
can be studied at U70
P.Zarubin, JINRLINC-2008
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Nuclear ClusteringNuclear Clustering P.Zarubin, JINRLINC-2008
can be studied at U70
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Angular distribution of fragments without spectroscopic magnet
16O + p -> 4He + X at 3.25 AGeV/c
V.V.Glagolev at al. 2001
Θ(25AGeV) ~ Θ(3.25AGeV)*3.25/25 => RFr > 1.7 cm at Z = 15 m
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Excitation energy per nucleon, MeV
T109
K Liquid
Gas
PHYSICS case 3: phase transition in a cold nuclear matter ?
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PHYSICS case 4: neutral meson photoproduction in AA-collisions
b) photoproduction
Coherence condition in the inverse kinematics:
-q2 < 1/Rtarget, i.e.
Eγ < γ/Rtarget = γ/1.2A1/3
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Inverse kinematics of neutral meson photoproduction in the AA-collisions
Eγ (max) = γ/1.2A1/3 for 12C + 56Fe -> meson+X = and 25 AGeV/c 12C beam Ethr ~ Eγ (max) ~ mmeson γ = 26.6 Eγ(max) = 1140 MeV
Thus π0, η, ω , φ photoproduction is possible in the reaction 12C + 56Fe -> meson+X at 25 AGeV/c
The meson energy in the Lab frame is as follows:Emeson > γ mmeson, i.e.
E(π) > 3.6 GeVE(η) > 14.6 GeVE(ω) > 20.8 GeVE(φ) > 27.1 GeV
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TrigBm = S1*S2*EPB(E<Ethr1)*EPSD(E<Ethr2)
PSD
LGD2 Magnet
Plastic Ball
target S2
S1
MWPC6
MWPC4
MWPC3 MWPC2 MWPC1
MWPC5
UrQMD simulation:C+C at 25A GeV/c,Total pz of beam fragments in lab
TrigTg = S1*S2*EPB(E>Ethr1)*EPSD(E>Ethr2)
Setup conception for the light ion fragmentation studies in ion-ion EM-interaction
Beam
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WA98 plastic ball: fragment detection in the target reference frame
ξ=log1.95ΔE 0.95E0.5ΔE −11.226
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Projectile Spectator Detector (PSD@CBM) for detection of the beam fragmentation
Spectator spots at Z=15m, EAu=15 AGeV,
simulation
Beam hole
XZ
Transverse sizes ~1x1 m2;
Distance from target - 15 m;
Number of modules – 107;
Module dimensions – 10x10x160 cm3
A.P.Ivashkin 2008, INR RAN
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PSD for CBM, design, construction and beam test results:
• Modular Lead/Scintillator sandwich compensating calorimeter
• Sampling ratio Pb:Scint=4:1
• Expectation: For thickness δPb=16 mm and δScint=4 mm σE/E ~ 50%/√E
• 60 lead/scintillator sandwiches.
• 10 longitudinal sections
• 6 WLS-fiber/MAPD
MAPDs and amplifiers
A.P.Ivashkin 2008, INR RAN
measurements
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Spectroscopic magnet in the experimental aria of the “Positroniy” channel (JINR) and DC
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Lead Glass Detector LGD2 (IHEP, Hyperon setup)
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Conclusion
• Ion beams at U70 accelerator are expected for users in 2010-2011
• The expected intensity of 12C beam in “Positroniy” channel is up to 106/cycle
• Different radioactive light ion beams can be created on the base of carbon beam with momentum of 25-30 AGeV/c
• An essential part of experimental equipment exists and could be used in the future experimental setup for 12C+A interaction studies
• This opens several quite interesting physics domains for experimental studies, including light nuclei at the limit on neutron stability, EM fragmentation of light radioactive nuclei, phase transition in a cold nuclear matter and neutral meson photoproduction
• Welcome to participate in the experiment