Mitglied der HelmholtzGemeinschaft on the LEAP conference Modification

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 Ge. V/c up to 3. 65 Ge. V/c Currently running experiments : Internal: ANKE, WASA, PAX External: TOF ANKE 2

ABS at ANKE and mounted pumps Turbopumps in chamber I & II ABS Cryopumps in chamber III, IV, V 3

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 4

Turbo pumps foreseen to replace the cryo pumps (available from earlier installations) 1* 1000 l/s 2 * 1600 l/s 1 * 300 l/s 5

ABS pump control unit compressors cryopumps § Flow of molecular H or D gas = 1 mbar ℓ/s § Turbomolecular Pumps § Cryogenic Pumps § Vacuum Gauges § Power Supply § rf Supply 6

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 7

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. 8

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 !! 9

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 10

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 k. W 2*1600 ℓ/s ≈ 700 W 1* 1500 ℓ/s ≈ 4 -5 k. W 1* 1000 ℓ/s ≈ 250 W 1* 800 ℓ/s ≈ 3 -4 k. W 1* 300 ℓ/s ≈ 150 W Total Power ≈ 12 k. W Total Power ≈ 1 k. W Thus, power consumption will be decreased by a factor of 12 as a result of the replacement. 11

4) Reduction of periodic maintenance expenses Ø The displacers in the cryopumps have to be replaced every 12 -18 months. Ø Price of a displacer: 1500 € for a small 1000 ℓ/s cryopump 3000 € for a big 3000 ℓ/s cryopump Ø Turbomolecular pumps donʼt have displacers, they need an oil change every year which costs ≈ € 100. Appreciable reduction of maintenance costs !! 12

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 13

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 K 1 K 2 Speed OK Self Test 14

Control of the Pumping System 2) Siemens S 7 -300 Controller Module Ad B D C Consists of: A) Power Supply (input 230 V – output 24 V DC) B) Central Processing Unit (CPU 315 -2 DP) C) Digital Input and Outputs modules (DI, DO) D) Communication Processor (CP) 15

Software Components Win. CC (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. 16

ABS Control System Configuration PLC programming PC: • Program development • On-line debugging • Program download (Burn-IN) PROCESS CONTROL COMPUTER: • Win. XP + Win. CC • PROFIBUS-DP Interface • GPIB (IEEE 488. 2) Interface GPIB (IEEE 488) PROFIBUS (1) MPI GATEWAY SIMATIC S 7 -300 HF Generator 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 17

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. 18

Dhanyawaad Thank you Dankeschön спасибо 19