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ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System ALBA VACUUM SYSTEM E. Al-Dmour On behalf of the design team 12 th -13 th Sep. 2005 Barcelona Slide 2 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System Talk Outline 1.General layout of the machine. 2.The vacuum system layout. 3.Deformation calculations. 4. Power calculations. 5.Absorbers design. 6.Pumping speed and pressure profile. 7.Instrumentations. Slide 3 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System General Layout of the machine. Slide 4 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System General Layout of the machine. * 4 fold symmetry. * 8 unit cells * 8 (Matching+ inv. Matching cells). * Straights: 4 LSS (8m): one for injection straight+ 3 for ID. 12 MSS (4.2m): All for ID. 8 SSS (2.6m): 3 for RF cavities, 2 for Diagnostics, the 3 rd harmonic cavity, 2 IDs. Slide 5 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System Main parameters Unit Cell Matching Cell Inverse Matching Cell General Layout of the machine. Slide 6 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System The Vacuum system layout Unit Cell 1.Stainless steel chamber. Copper/Glidcop absorbers. 2.Antechamber. 3.Lumped absorbers, no distributed absorbers except for the dipole vacuum chamber. Slide 7 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System Matching Cell Inverse Matching Cell The Vacuum system layout Slide 8 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System The vacuum system layout Dipole vacuum chamber 1. Standard dipole vacuum chamber. 2.Cooling coils/ cooling channels.. 3. Two absorbers. 4. Tapering to follow the Dipole magnet profile. 300l/s 150l/s Slide 9 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System The Vacuum system layout Post-Dipole vacuum chamber 1.Two absorbers, two pumps (500l/s, 300l/s) 2.Two pipes for the ID and BM beam line. ID beam line BM beam line 500l/s 300l/s Block 2b Slide 10 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System The Vacuum system layout Pre-Dipole vacuum chamber 150l/s NEG pumps Block 1b Minimum clearance between the magnets and the vacuum chamber is 2.0mm. Slide 11 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System 150l/s 1. Generic vacuum chamber for the straights which are not going to use in day one for IDs and for commissioning. 2. one absorber by the end of the straight. The Vacuum system layout The straights vacuum chamber MSS Slide 12 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System Deformation calculations Deformation for the critical vacuum chamber (largest width, longest distance between BPM). Max. deformation under vacuum=0.52mm Slide 13 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System Power calculations Total power from bending magnets = 407.0 kW Maximum Linear power density = 64.4 W/mm. Maximum Angular Power Density = 249.5 W/mrad 2. Maximum Surface power density = 246.2 W/mm 2. Maximum total power on the absorbers = 6.7 W Minimum distance from source point to the absorbers = 1.0 m The Surface power density and the foot print of the power in the absorber. normal incidence Surface power densities with respect to the angle of incidence. The effective vertical angle is 0.25 mrad, Slide 14 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System Absorbers design. The absorber of Soleil has similar load conditions like ALBA. Slide 15 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System Absorbers design. *Most of the radiation is absorbed by row A and B. *Row C is for the reflected photons and from the rest of SR which pass after row A and B. Slide 16 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System Input power values were with normal incidence and the effective vertical angle of the footprint was considered on the inclined teeth. Absorbers design. The max. cooling channel temp.=71C and unifrom for the 5 pin-holes. Slide 17 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System MSS LSS SSS * Nominal pumping for a vacuum cell= 3250 l/s * Nominal pumping speed for the storage ring= 57,400 l/s (from SIP) * Effective pumping speed for the storage ring=35,850 Pumping Speed Slide 18 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System Pressure Profile First injection: 3GeV, 10mA PSD = 2.010 -3 molec/ph. Total Pressure= 5.2310 -8 mbar Thermal desorption = 110 -11 mbar.l/sec.cm 2 Base Pressure= 7.210 -10 mbar Monte-Carlo simulations by Molflow, for 50m of the storage ring Slide 19 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System Pressure Profile First injection: 3 GeV, 500 Ah, nominal current=250mA Total Pressure= 2.010 -9 mbar Slide 20 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System Pressure Profile Fully conditioned vacuum chamber: 3 GeV, 1000 Ah, maximum current=400mA Total Pressure= 1.7710 -9 mbar Slide 21 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System Pressure Profile The effect of an in situ bake out on the average pressure . and the pressure on the beam lifetime PSD yield * * The report of the design specifications of Diamond synchrotron light source. June 2002. Slide 22 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System Instrumentation Slide 23 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System Comparison of the pumping speed with other machines Slide 24 ALBA Vacuum System, E. Al-Dmour Vacuum Systems for Synchrotron Light Sources 12 th -13 th Sep. 2005 ALBA Vacuum System Acknowledgements L. Schulz, R. Kersevan, E. Huttel and C. Herbeaux. Engineering Division members who contributed to this work: M. Quispe, B. Calcagno, L. Rib, and R. Martin