Mitglied der Helmholtz-Gemeinschaft
on the
LEAP conference
Modification
of the
Pumping System
of the Polarized Atomic Beam Source (ABS)
at the ANKE facility in COSY- Jülich
14.09.2011
by Viplav Gupta
IKP/Jülich, Jülich Center for Hadron Physics
FZ Jülich, Germany
COoler SYnchrotron ‘COSY’
Function: Accelerator as well as storage ring for
polarized and unpolarized protons
and deutrons
Circumference: 184 m
Momenta : 0.295 GeV/c up to
3.65 GeV/c
Currently running experiments :
Internal: ANKE, WASA, PAX
External: TOF
ANKE
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ABS at ANKE and mounted pumps
Turbopumps in chamber I & II
ABS
Cryopumps in chamber III, IV, V
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Specification of the pumps used at the ABS
Turbo Pumps (Pfeiffer Vacuum)
At chambers I and II
3*2200 ℓ/s, followed by
4*260 ℓ/s
and finally diaphragm pumps
Cryo Pumps (Leybold)
At chambers III, IV, and V
3000 ℓ/s, 1500 ℓ/s and 800 ℓ/s
Compressor Type: RW 4000
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Turbo pumps foreseen to replace the cryo pumps
(available from earlier installations)
1* 1000 l/s
2 * 1600 l/s
1 * 300 l/s
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ABS pump control unit
compressors
cryopumps
 Flow of molecular H or
D gas = 1mbar ℓ/s
 Turbomolecular Pumps
 Cryogenic Pumps
 Vacuum Gauges
 Power Supply
 rf Supply
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Motivation of Modifications
1. Avoid eventual damages to the installed turbopumps
2. Increase the time for experiments with polarized gas target
3. Achieve lower power consumption
4. Reduce the periodic maintenance expenses
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1. Eventual Damages
Space limitations
No gate valves installed to separate the cryopumps during
regeneration
Pressure bumps to the turbopumps in the earlier setup
Hence, to avoid damages, cryopumps will be replaced by
additional turbopumps.
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2. Increase the time for experiments with polarized gas target
Regeneration of cryopumps is done in a sequential, time
consuming process
Time needed for regeneration: 4-5 hours/week
To win over this time for the experiments, replacement is a
good feasible option
Beam time is valuable !!
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3) Lower power consumption
•
•
•
Heavy Compressors are used with
cryopumps
Compressor type: RW 4000
3 cryopumps are replaced,
each with a compressor
Rear view of a compressor
Front view of a compressor
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All 3 cryogenic pumps are to be replaced by 4 turbomolecular
pumps made available from previous experiments.
Cryogenic
Turbomolecular
1*3000 ℓ/s
≈ 5-6 kW
2*1600 ℓ/s
≈ 700 W
1* 1500 ℓ/s
≈ 4-5 kW
1* 1000 ℓ/s
≈ 250 W
1* 800 ℓ/s
≈ 3-4 kW
1* 300 ℓ/s
≈ 150 W
Total Power ≈ 12 kW
Total Power ≈ 1 kW
Thus, power consumption will be decreased by a factor of 12
as a result of the replacement.
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4) Reduction of periodic maintenance expenses
 The displacers in the cryopumps have to be replaced every
12-18 months.
 Price of a displacer: 1500 € for a small 1000 ℓ/s cryopump
3000 € for a big 3000 ℓ/s cryopump
 Turbomolecular pumps donʼt have displacers, they need an
oil change every year which costs ≈ €100.
Appreciable reduction of maintenance costs !!
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Control of the ABS Pumping System
Choosing the proper control system
On the basis of :
• Flexibility
• Reliability
• Long-term availability (choice of commercial system)
• Investment
• Life cycle costs
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Control of the Pumping System
Examples of hardwares components
1) Turbopump Controller: Electronic Drive Unit TCP 600.
Signals
Input to TCP
Shutdown Motor Current
Reset Acknowledge
Output from TCP
K1
K2
Speed OK
Self Test
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Control of the Pumping System
2) Siemens S7-300 Controller Module
Ad
B
D
C
Consists of:
A) Power Supply (input 230 V – output 24 V DC)
B) Central Processing Unit (CPU315-2DP)
C) Digital Input and Outputs modules (DI, DO)
D) Communication Processor (CP)
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Software Components
WinCC (Windows Control Center)
Siemens Simatic Step 7-300
•Man-machine interfacing in
automation design
•Offers system modules for
visualizing, reporting, acquiring and
archiving process data
•Thanks to the modularity and
flexibility new possibilities are open
for planning and implementing
automation tasks.
•Offers structured project design.
•Based on menu with drag and drop,
automatic address distribution by the
system
•On each level consistency check is
available, on-line test during the
design phase, strong debugging
support.
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ABS Control System Configuration
PLC programming PC:
• Program development
• On-line debugging
• Program download
PROCESS CONTROL COMPUTER:
• WinXP + WinCC
• PROFIBUS-DP Interface
• GPIB (IEEE 488.2) Interface
(Burn-IN)
GPIB (IEEE 488)
MPI
PROFIBUS (1)
GATEWAY
SIMATIC S7-300
HF Generator
HPT
HPT
PROFIBUS (2)
RS-232/RS-485 CHANNELS
DIGITAL / ANALOGUE I/O-s
HPT
Signal Distributor Box
Digital Scope
Temperature Regulator
DIFFERENT TYPES OF PUMPS
VACUUM GAUGE MEASUREMENTS
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Current Status
• Installation at a test chamber
• All components tested
successfully
• Pressure achieved in the
system ≈ 3*10-8 mbar
Control system has yet to be installed and checked.
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Dhanyawaad
Thank you
Dankeschön
спасибо
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