1 / 12

ESRF VACUUM SYSTEM

ESRF VACUUM SYSTEM. R. Kersevan, Vacuum Group, Tech.Serv.Division, ESRF, Grenoble. ALBA-MaxLab Workshop on Vacuum Systems for Synchrotron Radiation Light Sources, Barcelona, 12-13 Sept 2005. ESRF Machine Parameters:. Energy, GeV 6

lauraburns
Download Presentation

ESRF VACUUM SYSTEM

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ESRF VACUUM SYSTEM R. Kersevan, Vacuum Group, Tech.Serv.Division, ESRF, Grenoble ALBA-MaxLab Workshop on Vacuum Systems for Synchrotron Radiation Light Sources, Barcelona, 12-13 Sept 2005

  2. ESRF Machine Parameters: • Energy, GeV 6 • Filling modes uniform, 2x1/3, hybrid, single, 16-bunch, 4-bunch • Beam currents, mA 200 (multi-bunch); 90 (16-bunch); 15 (single-bunch) • Filling cycles per day 2 (multi-bunch), 4 (single, 16-bunch) • Circumference, m 844 • Symmetry 2x16 (hi-low/beta sections, 32 cells, 64 dipoles) • Dipole Field, T / bending radius, m 0.857 / 23.366 • Dipole radiation critical energy, keV 20.5 • Synchrotron radiation power, KW 982 (dipoles only) • RF frequency, MHz / RF stations / type 352 / 3 / normal-conducting, LEP-type cells • Number of straight sections and cells 32 • Length of straight section, m 5 (effective length available for ID segments) • Emittances: horizontal, vertical, nm 4.2, 0.190 (typical value, multi-bunch filling) Machine Operation: • Days of operation per year 287 (2005) • Scheduled hours in user mode (USM) 5472 (2004) • Number of shutdowns per year 5 (2x4week (Dec, Aug) + 3x10days (Mar, May, Oct)) • Number of machine-dedicated days (MDT) 1/week during operation, 4/machine re-start • Typical beam dose accumulated/run, A*hour 150-200 (depending on scheduled filling modes) • Beam availability 97.2% (2004) • Dead time for refills 0.75% (2004) • Dead time for failures, % / MTBF, hours 2.05% / 49.1 (2004)

  3. Vacuum System Specifications and Data: • Vacuum chamber materials 316L(N), 6060 T6 extruded Alu, OFHC Cu, GlidCop, bi-metal explosion-bonding transitions • Flange types modified ConFlat (reduced flange-to-flange gap); Wheeler (on in-vac IDs) ; bi-metal (Atlas) • Pumping system ion-pumps (StarCell), NEG pumps (GP-series), Ti-sublimators, NEG-coatings • Number of ID sections available / used 28 / 28 (unavail. to IDs: cell 4  injection ; cell 5, 7, 25  RF) • Gate valves 46 manual w/RF ; 22 pneumatic w/RF ; 59+3 manual w/o RF (FE, IR-beamline) (VAT) • Number of in-air ID chambers 27 (some sections have >1 chamber) • Number of pumps per in-air ID 2 (120 l/s SIPs) • Number of in-vacuum IDs 8 (7x2000mm + 1x1600mm proto) • Number of pumps per in-vac 2000 SIPs: 8x60 l/s, 1x400 l/s ; NEG: 1xGP500 ; Ti-sublimator: 2x • Beam lifetimes, hours 80 (uniform), 60 (2x1/3), 6-7 (single, hybrid), 10 (16-bunch) • Number of pumps per standard cell 11 SIP: 2x400 l/s, 4x120 l/s, 2x60 l/s, 3x45 l/s (Varian StarCell) 11 NEG: 2xGP500, 9xGP200 (SAES) • Averaged pressure at t = 60 hours, mbar 1.4E-9 (2x1/3 filling mode) • Typical no. of machine vacuum interventions, y-1vented cells: 10; in-air IDs: 12; in-vacuum IDs: 2; other (leak- detections, cabling, injector accelerators vacuum): 25-30 • Support to beamlines at least one technician is assigned to each BL (machine work has priority) • Vacuum group staff 1x physicist, 2x engineers, 13x technicians, 1x secretary

  4. ESRF: STANDARD CELL IP/NEG DISTRIBUTIONAND LOCATION OF VACUUM GAUGES: PEN6 PEN3RGA PEN4 PEN1 PEN5 PEN7 RGA CELL LENGTH: 844 / 32 = 26.4 m ~5000 mm Ion pumps (Varian): ID:120 l/s ; CV4/CV11: 120 l/s; CV3/CV10/CV15: 45 l/s; dipoles: 60 l/s ; crotches: 400 l/s NEG pumps (SAES): crotches: GP500 ; elsewhere: GP200

  5. Machine Status for RUN 05-4 (18/8 – 17/10/2005): NEG-COATED CHAMBERS: 10 mm ALU CV5073: 11x 15 mm ALU CV5073: 2x 15 mm ALU CV2093: 4x 10 mm SS CV5175: 1x Total NEG-coated length, m: 79.5 NO ADVERSE EFFECT ON RESISTIVE-WALL IMPEDANCE* - 0 - UN-COATED CHAMBERS: 15 mm SS CV5073: 6x 19 mm SS CV5073: 1x OTHER SS: 2x (3T-chamber + CV2000 AMPW @ C-15) - 0 - IN-VACUUM UNDULATORS: CV2000: 7x CV1600: 1x Minimum delivery gap, mm: 6 *T. Perron, “Single Bunch-Related Impedance Measurements on the ESRF Storage Ring", PhD thesis, November 2005, Université Joseph Fourier, Grenoble

  6. Vacuum System Monitoring and Control 1: • Main software application: • SRVAC • control of all equipment: pumps, gauges, remote GVs • visualization of pressures, temperatures, and vacuum interlocks status

  7. Vacuum System Monitoring and Control 2: Other applications have been developed during the years (Computing Service, Machine Diagnostic Group)… • VACUUM_SURVEY: • reference pressures are taken at end of MDT, and used to spot trouble points • detected many leaks ( mainly slow corrosion) at a very early stage • Beamloss “Cartography” MatLab application: • Useful for making links between beam losses and pressures around the ring during operation and MDT

  8. Machine and BL Databases and Web Pages: Vacuum web page: Vacuum conditioning plots: Synopsis of machine sections:

  9. Vacuum Conditioning of ID Chambers, RUN 05-4: Stored current • C-3: 15mm SS vented and re-baked • C-6: partially conditioned NEG/Alu 10mm from D15 • C-12: NEG/Alu 10mm from ID6 • C-19: Re-activation (no venting) of NEG/Alu 10mm • C-28: NEG/SS 10mm untouched lifetime

  10. Recent Projects and Developments (some still underway…): • Commissioning of second NEG-coating tower (now) • Cryogenic in-vacuum undulator (in-house program, ID group) (2006) • SC in-vacuum undulator (collab. other labs, industry) (2006) • “ESRF-2” NEG-Coated vacuum chambers (already tested on Cell 6) RUN05-3 • NEG-coating and/or testing for other labs: SLS, Soleil, … (now) • Upgrade of 15 and 19 mm SS ID chambers with 10mm NEG-coated ones • New PLC, new system for monitoring of temperatures • More…

  11. Bremsstrahlung Measurements of NEG-Coated Vacuum Chambers on ID6: • Each new NEG-coated CV5000 is pre-installed and pre-conditioned on ID6, where its bremsstrahlung level can be measured precisely (dedicated hutch). Very effective way of characterizing vacuum inside the ID chamber • Some chambers are pre-conditioned on dedicated vacuum group beamline (D15). Not yet clear whether it is effective or not Source: P.Berkvens, P.Colomp, ESRF Safety Group, “Radsynch2 Workshop”, ESRF 17-18/10/02

  12. Presentation made thanks to contributions and work from all members of the vacuum group, machine and operation groups, safety group, mechanical engineering group.THANK YOU FOR YOUR ATTENTION!

More Related