Erhard Huttel ISS/ANKA 1 CLIC damping wiggler CERN 03.12..2010 Vacuum Requirements etc. for ANKA General Requirements for UHV Vacuum: Pressure without.

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Presentation transcript:

Erhard Huttel ISS/ANKA 1 CLIC damping wiggler CERN Vacuum Requirements etc. for ANKA General Requirements for UHV Vacuum: Pressure without beam: < mbar Pressure with beam (200 mA): < mbar Leak rate: < mbar l / s Desorption rate: < mbar l / (cm 2 s) RMS (mass >2 without 28,44) / (mass 2):< 0.01 General Requirements for HV Vacuum: Pressure without beam: < mbar Leak rate: < mbar l / s Desorption rate: < mbar l / (cm 2 s) RMS (mass >28 without 44) / (mass <28):< 0.01

Erhard Huttel ISS/ANKA 2 CLIC damping wiggler CERN Materials Appropriate for UHV application (e-beam pipe) Steal:316 LN, 316L, 304L Copper:OFHC, CLIDCOP Aluminum:AlMg, ALCu, ALSi Ceramic:AlO Glas:Quartz, Sapphire, Pyrex

Erhard Huttel ISS/ANKA 3 CLIC damping wiggler CERN Pumping UHV:Pumps: Diode Ion-Ion-Pumps (Varian) Pump-Controller: (MIDIVAC, DUAL (Varian)) Connectors: (DESY) NEG V:Diaphragm Pumps (Vacuubrand) Scroll Pumps (Leybold) oil free!! HV: Turbo-Pumps (Pfeiffer) (Ionpumps)

Erhard Huttel ISS/ANKA 4 CLIC damping wiggler CERN Gauges / Valves Cold Cathode:Pfeiffer (IKR070, PKR251(full range)) Monitor:TPG300/TPG265analog output+RS422 Relay for interlock RMS:Pfeiffer QMG220 Faraday cup RF-All Metal.(Cetec) Gate, VAT All-Metal Gate:VAT All-Metal Right-Angle:(CETEC, VAT, Caburn)

Erhard Huttel ISS/ANKA 5 CLIC damping wiggler CERN Lifetime Limits at ANKA: Low energy Injection (0.5 MeV) No Low vertical beta at injection Present bottle neck: SUL-Wiggler-Al-Vacuum chamber:11 mm Preference to increase the gap at cryo temperature:13 mm Lifetime (180 mA):0.5 GeV, 11 mm gap: 2 h 2.5 GeV, 11 mm gap:18 h 2.5 GeV, 8? Mm gap:12 h Inelastic scattering: ~E ε acc Elastic scattering ~ gap 2 /(E 2 p β v ) Touschek

Erhard Huttel ISS/ANKA 6 CLIC damping wiggler CERN Special Issus SC Liner: 316LN, Copper-plated No Pumping UHV test before final assembling Isolation Vacuum: Pumping? Mechanical strength: Isolation Vacuum and e-beam-Vacuum to be vented independent Safety: Quench Burst-disk Corrector coils for 1st, 2nd field integral v (h?)

Erhard Huttel ISS/ANKA 7 CLIC damping wiggler CERN Limits (1st, 2d Harmonics) Maintain dynamic aperture Higher Harmonics: int. quadrupole component:0.005 T int. sextupole component:0.1 T/m int. octupole component:100 T/m 2 Roll +/- 10 mm:<0.5% Limit Orbit distortion < 50 µm in horizontal 5 µm in Vertical 1.Field integral v(h): ( ) Tm 2.Field integral v(h): ( ) Tm 2 Maximum Field Variation? Suppress Undulator spectrum?

Erhard Huttel ISS/ANKA 8 CLIC damping wiggler CERN SR Protection Radiated SR Power from bends (total):120 kW Power at wiggler ( m from bend):125 W Entrance/Exit:0.9 / 0.23 W/cm Protection by vertical scraper SCU14: 0.5 GeV (Injection) / 2.5 GeV scraper 32/13 mm from beam centre Further devices: 20 mm from beam centre

Erhard Huttel ISS/ANKA 9 CLIC damping wiggler CERN Liner-Cross section Ante chamber e-beam Chamber center not coincident with e-beam centre

Erhard Huttel ISS/ANKA 10 CLIC damping wiggler CERN He-Refrigerator ANKA: Zero-boil off:He refrigerator (Sumutomi) CLIC:He-plant:LINDE, ALCATEL, Size? Here we are

Erhard Huttel ISS/ANKA 11 CLIC damping wiggler CERN Control system PLC: S7 controller (…) Local visualization Visualization: PVSS Control parameter:Temperature He level / pressure Vacuum pressure Compressor / Liquifier