Transcript Booster NICA

NICA/MPD project
Booster conception
A.Butenko
V. Mikhaylov
VII International scientific workshop to the memory of
Prof. V.P.Sarantsev
Alushta (Crimea, Ukraine), September 02-07, 2007
NICA/MPD project
Ion source, LINAC
BOOSTER
NUCLOTRON ring
Superconducting collider rings
circumference 251m
maximum dipole field 3.5 T
maximum energy 3.5 GeV/u
averaged luminosity 1027 cm-2s-1
Alushta (Crimea, Ukraine), September 02-07, 2007
There are 3 possibilities of stripper position
1st
Stripper
position
2nd
BOOSTER Stripper
position
NUCLOTRON ring
3rd
Stripper
position
COLLIDER rings
Source, LINAC
Stripper position
After
linac
After
booster
Alushta (Crimea, Ukraine), September 02-07, 2007
After
Nuclotron
Equilibrium charge states and energy
charge
states
After
linac
Stripper position
Charge states
before/after stripping
After
booster
After
Nuclotron
30  64 30  82 30(90-92) 30  92
Kinetic equilibrium energy MeV/u
15(5)
60
400
Alushta (Crimea, Ukraine), September 02-07, 2007
>400
Booster magnetic rigidity
rigidity
Stripper position
After
linac
After
booster
After
Nuclotron
Charge states
30  64 30  82 30(90-92) 30  92
before/after stripping
Kinetic equilibrium energy MeV/u 15(5)
60
400
>400
Booster rigidity for U+30
Tm
–
9.0
25.2
–
Booster circumference
m
–
100
200
–
Alushta (Crimea, Ukraine), September 02-07, 2007
Equilibrium charge state
fraction
Charge state fraction of
Uranium ions
437MeV/u & 962MeV/u
for different stripper
materials
(measured on Bevatron)
Stripper position
After
linac
After
booster
After
Nuclotron
Charge states
30  64 30  82 30(90-92) 30  92
before/after stripping
Kinetic equilibrium energy MeV/u 15(5)
60
400
>400
+30
Booster rigidity
for U
Tm
–
9.0
25.2
–
Equilibrium
charge
state
0.2
~0.25
0.4
~0.9
Boosterfraction
circumference
m
–
100
200
–
Alushta (Crimea, Ukraine), September 02-07, 2007
Maximum energy at Nuclotron for different
charge states (at B = 45 T·m)
After
linac
Stripper position
Charge states
before/after stripping
After
booster
After
Nuclotron
30  64 30  82 30(90-92) 30  92
Kinetic equilibrium energy MeV/u
15(5)
60
400
>400
Booster rigidity for U+30
Tm
–
9.0
25.2
–
Booster circumference
m
–
100
200
–
Equilibrium charge state
fraction
0.2
~0.25
0.4
~0.9
Max. Energy at Nuclotron GeV/u
2.81
3.80
4.36
1.01
Alushta (Crimea, Ukraine), September 02-07, 2007
Vacuum requirements
Charge exchange
ion losses
during
acceleration cycle
in Nuclotron
Stripper position
After
linac
After
booster
After
Nuclotron
Charge states
30  64 30  82 30(90-92) 30  92
before/after stripping
Kinetic equilibrium energy MeV/u 15(5)
60
400
>400
Ion losses per cycle for He
concentration of 108 in
0.11
0.07
0.03
0.57
Nuclotron
Alushta (Crimea, Ukraine), September 02-07, 2007
Bunch length & space charge limit
Tune shift
Q
Normalized
emittance
0,2
1
·mm·mrad
+30 particles
number
6x109
+90 particles
number
3x109
Alushta (Crimea, Ukraine), September 02-07, 2007
After
linac
Stripper position
Charge states
before/after stripping
30  64 30  82 30(90-92)
Kinetic equilibrium energy MeV/u 15(5)
Booster rigidity at q=30
Tm
Booster circumference
m
Equilibrium charge state
fraction
Max. Energy at Nuclotron GeV/u
Ion losses for He
concentration of 108 in
Nuclotron
Comments
After
booster
After
Nuclotron
30  92
60
400
>400
–
9.0
25.2
–
–
100
200
–
0.2
~0.25
0.4
~0.9
2.81
3.80
4.36
1.01
0.11
0.07
0.03
0.57
Low
energy
Losses
level
Energy &
Preferable losses
level
Alushta (Crimea, Ukraine), September 02-07, 2007
Booster layout
(proposal)
hard SFT magnet is good strong base
for the new booster ring
Main Booster
parameters
Circumference
214 m
Injection
energy U30+
5 MeV/u
Maximum
energy U30+
450
MeV/u
Maximum
dipole field
1,8 T
Vacuum
10-11
Torr
Alushta (Crimea, Ukraine), September 02-07, 2007
Booster lattice proposal
DF doublet lattice for more effective
collimation of U31+ in booster
Booster lattice parameters
Circumference
Maximum B
Lattice type
214 m
27 T·m
DOFO
Superperiods
4
“DF” Periods
20
Strait sections
4 x 8,6 m
Dipol magnets
48 x 2 m
Quadrupole
magnets
Working point
40 x 0.4 m
4,5< w.p.<6,5
Booster superperiod lattice functions
Alushta (Crimea, Ukraine), September 02-07, 2007
Conclusion

Booster is needed for achieve the project energy
of 3,5 GeV/u after Nuclotron
•
•
•
stripping after booster
the booster energy > 350 MeV/u for minimization of
stripping losses and losses on residual gas in Nuclotron
booster circumference is large enough for minimization of
space charge influence.
Alushta (Crimea, Ukraine), September 02-07, 2007
Спасибо за внимание
Alushta (Crimea, Ukraine), September 02-07, 2007