the light ion guide cb- ecris project at texas a&m university
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The Light Ion Guide CB-ECRIS Project at Texas A&MUniversity Cyclotron Institute
The Light Ion Guide CB-ECRIS Project at Texas A&MUniversity Cyclotron Institute
G. Tabacaru (TAMU), J. Arje (Jyvaskyla), D.P. May (TAMU)G. Tabacaru (TAMU), J. Arje (Jyvaskyla), D.P. May (TAMU)
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Project overviewProject overview
Cyclotron Institute Texas A&M:• 88” Cyclotron (decommissioned1986)• K500 Superconducting Cyclotron
Upgrade started 2004 → full speed 2005
Re-activation of 88” Cyclotron – deliverhigh intensity light particle and heavy ionbeams.
Production of rare isotopes for accelerationin K500 Superconducting Cyclotron andhigher intensity stripping and fragmentationbeams.
G. Tabacaru, ECRIS 08, Chicago
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Scientific programScientific program
1. Nuclear Astrophysics:a. Radioactive beams from K500: Asymptotic Normalization
Coefficients methodb. Stable beams from 88”: (3He,d) reactions and MDM
spectrometer2. Nuclear Structure:
a. Giant Monopole Resonance and Compressibility: GMR asa nuclear structure effect and compressibility in nucleiwith much higher asymmetry
b. Cluster Structure: radioactive beams and thick targetinverse kinematics technique
3. Fundamental Interactions: superallowed β-decaymeasurements
4. Nuclear Dynamics and Nuclear Thermodynamics
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RF-only hexapole
Target ChamberHe ~ 300 – 500 mbar
~ 1mbar
~10-2mbar
~10-6mbar
Faraday Cup
Glaser lens
The Light Ion GuideThe Light Ion Guide
to CBECR
In collaboration with Dr. J. Arje - Jyvaskyla
proton beam
G. Tabacaru, ECRIS 08, Chicago
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4×10526110In (4.9h)
2×10528108In (58.0m)
4×10528106In (6.20m)
2×1053592Tc (4.25m)
2×1054564Ga (2.63m)
4×1044554Co (0.19s)
1×1054550Mn (0.28s)
4×1045727Si (4.16s)
particles/sMeV/AProduct (T1/2)
IntensityMax Energy(p,n)
Projected beam intensities from LIGafter K500
Projected beam intensities from LIGafter K500
G. Tabacaru, ECRIS 08, Chicago
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The RF-only hexapoleThe RF-only hexapole
SIMION calculations ~ 80% efficiency for 250 cm long sextupole
G. Tabacaru, ECRIS 08, Chicago
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Details – Light Ion GuideDetails – Light Ion Guide
Parameters: exit hole diameter (1 mm and 2 mm), pressure, DC-fields,distance between the exit hole and the sextupole, etc …
Pumping system (Pfeiffer):• ROOTS blower 1: 2000 m3/h (+ 6000 m3/h – online condition)• ROOTS blower 2: 1000 m3/h• Turbo pumps: 520 l/s + 2× 520 l/s (CB-ECRIS)
Initial developments:• spark chamber (ionization of impurities, He) → current• 228Th open source (daughters) → alpha particles from 216Po
G. Tabacaru, ECRIS 08, Chicago
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Details – CB-ECRISDetails – CB-ECRIS
Design and built by Scientific Solutionsof San Diego, California Operate at 14.5 GHz Two large coils: max ~ 1T Hexapole Nd-Fe-B: ~1.1T
hexapole
axial coil
Electrodesforinjection
WORK IN PROGRESS !!!0
0.5
1.0
1.5
2.0
-15 -10 -5 0 5 10 15
AMPERESData
Axial Displacement(inches)
Mag
netic
Fie
ld(k
Gau
ss)
Charge-Breeder Solenoid QAFinal Magnet Configuration @50 Amps
5-JAN-07
-20
-10
0
10
20
0 90 180 270 360
y = a*sin(b*x+c) max dev:2.1903, r2=0.99384a=11.533, b=3.0093, c=-0.67063
Rotation Angle
Rad
ialM
agne
ticF
ield
(kG
auss
)
TAMU SextupoleInitial QA Checkout
5-JAN-07
G. Tabacaru, ECRIS 08, Chicago
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Tests – spark chamberTests – spark chamber
Ifc, Isp vs Ptc
0
2
4
6
8
10
12
14
0 100 200 300 400 500
Ptc [mbar]
Ifc
[nA
]
Ifc [nA]Isp [x0.33mA]
LIG-SP100cm9-Oct-07
Øe = 1.0mmXes ≈ 3.5mmØelectrode =4mmXrods ≈ 29mmIsp = (1.07-1.23)*3.3mAf = 3.485MHzVrf = 6.0V (gen.)Velectrode=floatingVtc = Vrf,dc togetherVsp = 227 VI-Glazer = 0
Ifc vs. +Vfc vs. Ve
0
5
10
15
20
25
30
0 50 100 150 200Vfc [V]
Ifc
[nA
]
Ifc [nA], Ve=+202VIfc [nA], Ve floatsSIMION normalized
LIG27-Jun-07Øe =2.0mmØelectrode =4mmXes ˜ 3.5mmIsp =0.15*3.3mAVsp =238VIfc =ave/100samplesf =5.630MHzVrf =10.0V (gen.)Vtc =-Vrf,dc =8.5VPtc =170mbar
SSmesh 0.8x0.8mm2inside sp-chamber
-->no effect
G. Tabacaru, ECRIS 08, Chicago
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Plasma chamber
Microwave 14.5 GHz
Sextupole
Tests – 228Th open sourceTests – 228Th open source
Si det
Aluminized mylar 1.5 µmAluminized mylar 1.5 µm
Ra, Rn, Po
G. Tabacaru, ECRIS 08, Chicago
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Tests – 228Th open sourceTests – 228Th open source
• Partially simulate the online conditions• Lower final velocity at the injection in the CB-ECRIS• Alpha particle detection necessary – difficult to fine tune
228Th and daughters alpha spectra
228Th
216Po
212Po
216Po approx 100 α/sec216Po approx 100 α/sec
backgroundbackground
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Velocity of the ionsVelocity of the ions
0
5
10
15
20
25
30
35
40
45
50
-40 -20 0 20 40 60 80
Retarding bias [V]
Yie
ld[a
lph
as/s
ec]
approx 20-25 eV
Q: Is this velocity appropriate for an efficient injection in the CB-ECRIS?Q: Is this velocity appropriate for an efficient injection in the CB-ECRIS?
G. Tabacaru, ECRIS 08, Chicago
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Future plansFuture plans
CB-ECRIS to be turned on in the next weeks TWT – max 400 W coils at 250 A plasma?!
Inject Ra, Rn, Po Detect alphas at the extraction
IF success GOTO Improve_EfficiencyELSE
Find Stable Conditions for CB-ECRIS
Measure the overall efficiency of the device
CB-ECRIS to be turned on in the next weeks TWT – max 400 W coils at 250 A plasma?!
Inject Ra, Rn, Po Detect alphas at the extraction
IF success GOTO Improve_EfficiencyELSE
Find Stable Conditions for CB-ECRIS
Measure the overall efficiency of the device
G. Tabacaru, ECRIS 08, Chicago
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Upgrade TeamUpgrade TeamDr. R.E. Tribble - director
Dr. H. Clark – Project Manager
F. Abegglen – Operation ChiefH. Peeler – Research
Instrumentation
K150 – Re-commission Light Ion Guide &Heavy Ion Guide
Managers
Dr. G. TabacaruDr. G. ChubaryanDr. G. Souliotis
CBECR &New beam lines
Dr. D. MayDr. G. Kim
Radiation issues &Beam dump
Dr. G. TabacaruThank you!
G. Tabacaru, ECRIS 08, Chicago