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on the LEAP conferenceModification of the Pumping System

of the Polarized Atomic Beam Source (ABS)

at the ANKE facility in COSY- Jülich

by Viplav Gupta IKP/Jülich, Jülich Center for Hadron Physics

FZ Jülich, Germany

14.09.2011

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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

ABS Cryopumps in chamber III, IV, V

Turbopumps in chamber I & II

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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)

2 * 1600 l/s

1 * 300 l/s

1* 1000 l/s

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ABS pump control unit

Flow of molecular H or D gas = 1mbar ℓ/sTurbomolecular PumpsCryogenic PumpsVacuum GaugesPower Supply rf Supplycryopumps

compressors

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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 Rear view of a compressor

• 3 cryopumps are replaced,

each with 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.

Thus, power consumption will be decreased by a factor of 12 as a result of the replacement.

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

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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 CurrentReset Acknowledge

Output from TCP

K1 Speed OKK2 Self Test

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Control of the Pumping System

2) Siemens S7-300 Controller Module

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)

B

Ad

D

C

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Software Components

WinCC (Windows Control Center)

•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.

Siemens Simatic Step 7-300

•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

PROFIBUS (1)

SIMATIC S7-300

PROCESS CONTROL COMPUTER:

• PROFIBUS-DP Interface• GPIB (IEEE 488.2) Interface

GPIB (IEEE 488)

GATEWAY

Digital Scope

HF Generator

Temperature Regulator

RS-232/RS-485 CHANNELS

DIFFERENT TYPES OF PUMPS

VACUUM GAUGE MEASUREMENTS

DIGITAL / ANALOGUE I/O-s

• WinXP + WinCC

PLC programming PC:

• Program development• On-line debugging• Program download

(Burn-IN)

MPI

HPTSignal Distributor Box

HPT HPT

PROFIBUS (2)

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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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DhanyawaadThank you

Dankeschönспасибо