Transcript Document

Status of the project Nuclotron-M
(1st stage of the NICA/MPD)
JINR Scientific Council, Feb.21,2008
Grigory Trubnikov & NICA team
 Stages and milestones of the Nuclotron upgrade
 Results of the Nuclotron run (#37)
 Works on coming Nuclotron run (#38)
 Conclusion
NICA goals and physics problems
Study of in-medium properties of hadrons and
nuclear matter equation of state, including a search for
possible signs of deconfinement and/or chiral symmetry
restoration phase transitions and QCD critical endpoint in the
region of √s NN=4-9 GeV
by means of careful scanning in beam energy
and centrality of excitation functions for
the first stage
♣ Multiplicity and global characteristics of
identified hadrons including multi-strange
particles
♣ Fluctuations in multiplicity and transverse
momenta
♣ Directed and elliptic flows for various hadrons
♣ HBT and particle correlations
the second stage
♣ Electromagnetic probes (photons and dileptons)
Required mean luminosity is about 1027 cm-2s-1
NICA general layout
ESIS & Linac
Booster
MPD
Nuclotron
Collider
C = 225 m
The second
possible
detector
Nuclotron provides now performance of experiments on accelerated proton
and ion beams (up to Fe24+, A=56) with energies up to 5,7 and 2,2 GeV/n
correspondingly (project parameters for ions 6 GeV/n with Z/A = 0,5)
1 stage: Nuclotron-M
Leaders: A.D. Kovalenko, G.V. Trubnikov
Deputy leaders: V.I. Volkov, A.V. Butenko
Institute theme 02-00-1065-2008/2010
The Goal – to reach parameters of Nuclotron by 2010
required for realization of NICA project by:
 Development of new injection complex
 Modernization of RF system
 Upgrade of diagnostics and beam control systems
 Modernization of the vacuum system
 Modernization of the electric- and cryo- supply systems
 Development of the minimum required infrastructure
ACCELERATOR
10 stages-subprojects of the Nuclotron-M project
1. Modernization of ion source KRION to KRION 6T;
2. Improvement of the vacuum in the Nuclotron ring;
3. Development of the power supply system, quench detection and energy
evacuation system of dipoles and quadrupoles;
4. Modernization of the RF system (including trapping & bunching
systems, controls and diagnostics);
5. Modernization of the slow resonance extraction system for extraction of
accelerated heavy ions at maximal energies;
6. Modernization of automatic control system, diagnostics and beam
control system and other systems;
7. Transportation channel of the extracted beams and radiation safety;
8. Improvement of the economical efficiency of the cryogenics;
9. Continuous modernization of the injector complex (fore-injector and
linac) for acceleration of heavy ions;
10. Development and creation of high intensity polarized deutron source
Research and investigation of the beam dynamics, minimization of the
beam losses at all stages from injection to acceleration and to extraction of
the beams (not more then 15-20%, now we have about 70-80%).
Development of heavy ion source KRION
(team of Е.Е. Donets and Е.D.Donets)
The fist Au32+ ion beams have been obtained in October 2006. Ionization time was 100 ms. The
total intensity was of 1.2*109 ions/pulse. Developed and tested injection technology of Au atoms
to KRION-2. Obtained Au beams with charge up to including Au51+. Results achieved in last run
at KRION: intensity of the Au51+ is 108, at extraction duration 8 sec
The new important feature of the source is capability of operation at high pulse repetition rate in the
case of production heavy ions at intermediate charged states, was considered.
U30+ intensity of (4-8)1010 ions/sec can be reached in the case of the pulse repetition rate of 5-10 Hz.
Construction and test of the new ion source with 6 T solenoid within the
coming two years is the main goal of the project.
The fundamental parameter of a KRION-type source is a factor jτ - product of electron current
density and ionization time. The jτ, depends on the applied external magnetic field (now not >3T).
Ionization capability (left plot) and experimental results from the ion
source KRION-2 on generation of highly charged state gold ions.
- Design and construction of the new heavy ion source KRION-6T aimed at generation
of heavy ion beams with q/A up to 0.33 (for example Au65+  Au69+);
- Study of the electron string phenomenon at different conditions (B up to 6 T, Ee up to
25 keV). The further investigation of tubular electron-string ion source;
- Preparation of the existing source KRION-2 to the run at Nuclotron aimed at
acceleration of the ion beams at atomic mass range A ~ 100 (for example, I43+, A=127).
Modernization of the power supply system , quench detection and energy
evacuation system (team of V.Karpinsky, E.Ivanov)
Goal: Provide stable, safe and long operation of Nuclotron magnetic system at B = 2 T
and B field ramp not less then 1 T/s
Scheme of the Nuclotron structural magnets power
supply (thyristor switches marked with yellow)
The new improved unit for energy damp
from the magnets in the case of quench
(so-called “thyristor switch”) was
designed, constructed and tested.
Produce and put into operation six such units for both the dipoles and the
quadrupoles power supply circuits.
The other works on improvement of the power supplies for bending magnets of injection
channel, beam extraction line from the Nuclotron to experimental area, building 205 are
also included into the project.
Upgrade of the Nuclotron ring vacuum system
(team of H. Khodzhibagiyan)
At the present time there is no possibility to pump out gaseous He defusing into the beam pipe
through non-hermetic connection near the beam extraction pipe inside the cryostat.
The averaged presure in the Nuclotron beam pipe is estimated to about ~ 2-3∙10-8 Torr
(nitrogen equivalent at 300 K). This value was measured during the last run in Nov. 2007
Two stages of the system improvement are proposed:
Stage 1: necessary development within the “Nuclotron-M”
Stage 2: will be considered within the NICA TDR
Development of the accelerator RF system, upgrade of
the electronics and the particle capture scheme
(department of O.Brovko, A.Eliseev)
Construction and put into operation the third RF station that will allow to provide
acceleration of the particles at the magnetic field ramp up to 2 T/s.
Increase of the Nuclotron longitudinal acceptance by means of design and put
into operation adiabatic scheme of the particle trapping and adequate increase of
the particle trapping efficiency (by a factor of two).
Modernization of the system of the frequency/ field control electronics. This
system is especially important because of the planned operation of the
accelerator with different ion species within the same run.
Preparation of the project for relativistic heavy ion bunch compression system
with the parameters suitable for the NICA.
Heavy ion beam extraction at maximum beam energy
( leaders V.Volkov, A.Butenko,A.Taratin, A.Sidorov)
- Modernization of electrostatic septum
(ESS) aimed at increase of operation voltage
up to 200 kV to provide necessary deflection
of the extracted particles up to the magnetic
rigidity of the Nuclotron correspond to the
NICA specification (B >1.8 T )
- Put into operation additional correcting
power supply for the Lambertson magnet of
the beam extraction system
- Design and realization of heavy ion
extraction scheme with the use of a crystal
septum.
- Design of a scheme for fast extraction of
compressed heavy ion bunch.
The most problematic is the first problem. Maximum ESS voltage is limited at the present
time to about 125 kV by the electrical discharges. It is proposed to modify the ESS unit. The
use of a crystal septum is considered as additional possibility to provide additional deflection
of the extracted ions to the ESS. It could be possible to provide the extraction at maximum
accelerator rigidity without replacement of the ESS.
Modernization of the Nuclotron control system,
beam diagnostics and the accelerator complex parameters
(V.Volkov, B.Vasilishin, V.Andreev)
Basic goals:
− Development of the Nuclotron control and local network systems for higher
reliability, extended possibilities of the existing system, put into operation the
advanced industrial PC farm;
− Upgrade of the sub-system for the accelerator magnetic field control;
− Modernization of the sub-system for beam extraction control;
− Improvement of operation parameters of the equipment for extracted beam
diagnostics (extended dynamic range of the measured beam intensities, better
accuracy, less materials along a beam path are suppose after the planned
modernization);
Beam dynamics study and minimization of the particle
losses at all the stages of accelerator cycle
The losses can be reduced by factor 5-6
due to improvement of RF trapping scheme
and precise beam dynamics study during
first 100-200 s after injection
Beam-time of 800 hours is requested in 2007-09 for the studies
Beam transfer lines and radiation shield
(sector of P.Rukojatkin)
- Modernization of the main beam extraction and transport line from the
Nuclotron beam output window to the building 205;
- Minimization of the material along the beam path;
- Design and mounting of automatic system of the power supply control for
optic elements;
- Minimization of energy consumption at transport lines for extracted beams.
Modernization of the cryogenic system
(leaders N.Agapov, V.Batin)
Design and construction of the
system for diagnostic and computer
control of the existing helium
refrigerators KGU-1600/4.5 and
all helium circuit;
Design, construction and put into
operation the system for recondensation of a cold gaseous
nitrogen evaporated after cooling
heat screens of the Nuclotron ring
cryogenic modules; - factor 2-3 of
economical efficiency
Reparation and partial replacement
of the cryogenic equipment that
have exceeded tolerable operation
period.
Design of the new fore-injector with injection and extraction lines
(leaders V.Monchinsky, A.Sidorin, V.Kobets, A.Govorov)
The new heavy ion injector is necessary for realization of NICA project. The approved
basic concept of the NICA injector is based on the new ion source KRION-6T and linear
accelerator (with fore-injector) to provide acceleration of heavy ion beams (q/A 0.12) up
to 6 MeV/u. Construction of the new linac with fore-injector will be performed within the
frames of a separate project “INJECTOR NICA”
- Modernization of the existing linac LU-20: improvement of vacuum pumping
system including beam transport line to the nuclotron, development of the linac
control system…
Design and construction of high intensity polarized light ion source.
(leaders V.Fimushkin, A.Kovalenko)
The main direction of work aimed at increase of polarized beam intensity at the Nuclotron is
connected with the design and construction of the new high current polarized ion source
(IPSN) based on the equipment of CIPIOS polarized proton and deuteron ion source from
Bloomington. The work is carried out in collaboration with INR (Troitsk). The ion source
equipment (not completed) was transported to Dubna from IUCF (Indiana University,
Bloomington, USA). Some parts of a suitable equipment for the new source were presented
from DAPHNIA (Saclay).
Design of the new pre-accelerator with injection and extraction lines
(leaders A.Sidorin, V.Kobets, V.Monchinsky, A.Govorov)
The existing complex will
be used for protons,
deuterons, polarized
deuterons and light ions
(Z/A > 0.3).
The new heavy ion source
KRION-6T, upgrade of
pre-accelerators and
improvement of vacuum in
LU-20 and injection line is
supposed in the frames of
project “Nuclotron-M”.
The limiting charge-to-mass ratio of ion accelerated in the LU-20 is q/A 0.3. The
possibility of the KRION-type ion source with the magnetic field of 3 T and energy of the
electron beam up to 6 keV (existing version of the source) can provide ion beam of 127I43+ ,
i.e. ions with q/A ≈ 0.34. Thus, it is possible to perform a test acceleration of heavy ion
beam with atomic mass of 130 at the Nuclotron after completion of the work on
improvement of vacuum in the accelerator chamber. Acceleration of gold ions will be
performed after construction of KRION-6T ion source.
A.D. Kovalenko, Section of APT BF JINR, Dec.07
2007
Nuclotron runs: period,
# / hours
beams
2008
Oct.-Nov.
37 / 600
d, 6Li
Accel.
R&D
Nuclotron-M
Flavor
NIS+GIBS
x
TPD
x
x
«CIPIOS»  SPD
Polarization
Extracted beams:
STRELA, , 2,
ALPOM (T4.5, GeV/n)
FAZA
Physics & R&D for NICA:
Applied & innovation works
o
Nov
39 / 600
p, A130
x
put
Internal target: LNS
MPPT
RNP
x
May-June
38 / 600
d, 6Li
2009
x
Feb.-Mar.
40 / 600
d, p, A
4 GeV/N
x
2010
Oct.-Nov.
41 / 600
p, A200
x
x
in o p e r a t i on
x
Feb.-Mar.
42 / 600
d, p, A
ready
x
x
x
o
x
x
o
x
x
p r e p a r a t i o n (transverse polarization)
x
x
x
x
x
ready
x
x
x
x
x
x
x
x
x
x
x
x
x
Well focused tasks of Nuclotron-M program, 100-300 h. Pre-requisit for NICA & physics.
Physics – ready to start
Work with POLARIS (conditional): requires successful Nuclotron-M stages (high intensity, energy)
RUN # 37
29.10.07 – 16.11.07
(450 hours)
• Ions of 6Li had been accelerated up to 25 MeV/u;
• Measured value of circulated beam lifetime using comparison of deuterons
and Н2+ (τ >3ms) corresponds to the pressure ~2·10-8 Torr ( for N2 equivalent)
• First experiments were successfully started with pseudoadiabatic trapping at
magnetic field plateau. It was shown that the beam intensity can be increased
by factor 2;
• Experiments on series connection of magnets and lenses – allowed to
decrease amplitude of magnetic field ripple up to 15 times;
• Methodical shifts aimed on investigation of particle losses on the first turns
were performed.
Some other technical experiments and methodical studies were done and
some new diagnostic equipment were installed and successfully tested.
Next run (№ 38)
• May 2008 (~ from 17 May to 15 June)
• Program:
– Systems preparation, cooling – 140-150 hours;
– Physical shifts – 290-310 hours:
DELTA-2 (50), Energy-Transmutation (12), NIS-GIBS
(134), TPD (58), FAZA (46)
– Methodical shifts – 140-160 hours:
vacuum improvement, vacuum measurements and
spectrometry, adiabatic trapping, new prototype of BTF,
new prototype of transition sensors, test of prototype of
evacuation system, RF system upgrade and diagnostics,
new prototype line of power supply for correctors,
injection matching, corrected beam-bump, power supply
system upgrade, existing Linac modernization, …
Total revision
Specially developed plan of revision and modernization
(started mid. Jan’08)
position
Responsible pers
Geodesy in the tunnel, alignment of optic elements
Butenko
Revision and repairing of LU-20 vacuum systems, cryopumping
Monchinsky
Revision of pick-up station, new BTF prototype
Brovko
Slepnev
RF system – upgrade, shielding, diagnostics
Brovko
Water supply point upgrade
Semin
Revision of beam-bump (correctors 4К3, 4К4, 5К2, 5К3)
Volkov
Power supply system modernization
Karpinsky
…………………..
Development of new protection and safety system
 ~ 140 positions…
Butenko
Alfeev
Status on Nuclotron-M
1 stage of the NICA project




New injection complex:
New ion source prototype (KRION-6T) – in progress
Modernization of RF system – work had been started
new Linac – Contract with IHEP is under signing
Vacuum system -equipment is partially installed on delivery
Power supply system and control of magnetic system
- 1st block is under testing
Upgrade of beam diagnostics
- in good continuous progress
Required R&D – priority task for Nuclotron runs
This stage has to be completed by 2010 providing:
- Accelerated heavy ions with A ~ 100 ÷ 200
- Beam intensity ~ 107 A/pulse
- Beam energy > 3,5 GeV/n
- Required infrastructure
The New Parametric Current Transformer (in flange)
for non-destructive measurement of average beam current...
Contract with Bergoz Instrumentation.
NPCT is ordered – has to be installed by May’08
Very fruitful collaboration with Vacuum Praha
- Modernization of the Nuclotron vacuum system:
step-by-step
Several new pumps
– Feb 08, April 08
Mass spectrometer Prisma+
QMS 200 F – Feb 08
Vacuum measurement unit
TPG 300 – Feb 08
Pumping stations, valves, sensors – Feb 08, Apr’08
Work with modernization of
energy evacuation system
is in good progress …
Upgrade of RF
system and
diagnostics:
Modernization of
cryogenic systems:
Control room,
beam diagnostics
Infrastructure !
Modernization at LU-20 complex
Scheme of Unified Accelerator Division works !
Groups and sectors of high-professional specialists joined from LPP
actively instill into Nuclotron-M (beam diagnostics, thermo- and magneto- metry,
RF and HV technique, LINAC, …) and NICA (injection, extraction, beam dampers,
transportation channels, cryogenics, beam cooling, …) projects.
Conclusion
 Strategic plan of the JINR accelerator
complex is development in the High Energy
physics + adequate scientific program.
Priority task – project NICA/MPD
 Realisation of the 1st stage in 2008-2010
has principal importance for critical
decision on the proposed strategy of JINR
accelerator complex development
 Program of physics research at Nuclotron is directly
coordinated to strategy development of accelerator complex
at the 1st stage (Nuclotron-M)
 Organization of the Russian and Foreign cooperation,
attraction of the external resources – one of the necessary
conditions for successful completion of the project
 Active work for collaboration is in progress with Helmholz
association, GSI, CERN, and other centers on the joint
operations on creation accelerator complexes NICA and
FAIR for further joint execution of the actual physics
research
 Good start is under way with IHEP (Protvino) – realization of
the task of injector creation, joint workshop 13-14 Feb’08
Thank you for your attention !