ALS top-off upgrade review, RF systems

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ALS Top-Off Upgrade Booster RF
Systems 11/22-23/2004
Ken Baptiste ALS RF Group
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RF System Modes
Energy Injection Rate Mode Cavity Power 1.5
GeV Ramped, 1 Hz Operation 15 kW peak 1.9
GeV Ramped, 0.5 Hz Operation 66 kW
peak N.A. Ramped/Continuous Test/Maint 70 kW CW
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RF System Parameters for 1.9GeV
Frequency (MHz) 499.64 Harmonic
number 125 Peak effective voltagea
(kV) 813 Beam current, multibunch mode
(mA) 4 Synchrotron radiation loss, dipoles
(kW) 5 Total effective shunt impedance, ZT2
(MW) 5 Fundamental-mode cavity dissipation
(kW) 66 Waveguide and other lossesb
(kW) 11 Total RF power (kW) 77 Total RF
power installed (kW) 80
a based on 66kW dissipation b estimated to be
0.3dB transmission loss 11 RL for b2
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Systems Effected by the Upgrade

• Final Amplifier/Transmitter
• HVPS
• Cavity Window
• RF Feeder/Transmission Line
• Controls Interlock System
• Utilities
• Spares

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Existing Final Amplifier/Transmitter

• UHF TV Xmtr manufactured by Townsend Broadcast
  (out of business)
• 15kW Aural, 30kW peak sync Vision
• EEV Klystron K3371BCD
• 15 years of service

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Proposed Final Amplifier/Transmitter

• UHF TV Xmtr manufactured by Thales Broadcast
  Multimedia
• 80kW CW
• Thales IOT TH-793, (Inductive Output Tube)
• Embedded PLC, System PLC for intrfce to control
  sys.
• Other Vendors Acrodyne Ind., Axcera,

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Final Amplifier/Transmitter
Parameter E2V K3773 Klystron Thales TH 793 IOT E2V D2130 IOT Thales IOX Series Xmtr
Output Power (kW) 75 80 85 80
Gain (dB) 34 - 42 22.7 20.5 23 22.7
Beam PS 25kV_at_5.8A 36kV_at_3.3A 35kV_at_3.1A 36kV_at_3.3A
Fil. PS Upgrade Yes Yes Yes Included
Focus PS Upgrade No Yes Yes Included
Grid PS Upgrade N.A. Yes Yes Included
Crowbar Upgrade N.A. Yes Yes Included
Drive Amp Upgrade N.A. Yes Yes Included
Fits in Current Cabinet Yes Yes Yes Fits in current site
Energy Costs Increase vs. Existing Xmtr (6720 Hr, 0.12/kWH) 108.2k 65.0k 55.8k 73.1k
Transmitter Retro-fit tube Retro-fit tube Retro-fit tube New
Includes transmitter control power not just HVPS
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HVPS Type
Amplifier Type Amplifier Type Location Location
HVPS Type Klystron IOT Inside B6 Outside B6
Oil Cooled- Cost/Del No bid requested Del. 4 6 mo No Yes,
Air cooled- Cost/Del Del. 3 - 4 mo Del. 3 4 mo Yes Yes,
Per Gary Piermattei, EHS-Fire Protection
HVPS Simplified Block Diagram
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HVPS Location
Existing HVPS Location
Temp Install new system to allow for acceptance
test, control system programming, and
commissioning.
New HVPS Location
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RF Cavity Power Coupler Window

• Current Design
• 2 in SRRF operating at 43kW CW
• 1 repaired fully tested spare
• Manufacture, TiN coating test to 66KW CW at
  LBNL
• Manufacture 2 more windows of this type for
  Booster RF

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Titanium Nitride Coating
TiN Coating System
Coating thickness determined by Rutherford Back
Scattering (RBS) performed on site at LBNL. This
sample measured 15 angstroms. Our target range is
10 20 angstroms.
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Power Test/Condition Window

• B27 Cavity Teststand, 66kW _at_ 500MHz
• Identical cavity to Booster and Storage Ring

• Power Conditioned in 24 Hrs over a 4 day period.
• 21 Rev Pwr Trips
• 5 Vac Trips
• Window Temp ran lt 80C

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RF Feeder/Transmission Line
New system

• All new components are catalog items.
• Existing system is comprised of 3 1/8 EIA coax
  line, 3 air dielectric flexible coax line, 6
  1/8 75kW circulator, and WR1800.

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Controls Interlock System

• PLCs to be rated Safety Integrity Level (SIL) 3
• Leverage existing ModBusTCP interfaces
• Replaces 60 of the installed BRF ILCs
• Re-use existing Low Level RF Controller until
  replaced with FPGA based controller
• System Controller and Embedded PLCs delivered
  programmed for xmtr control
• Plan to install transmitter temporarily on ALS
  floor for pre-shutdown commissioning and controls
  programming.

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Utilities
in series
Transmitter LCW Circuit Cavity LCW
Circuit Capacity exists for both the 480VAC and
LCW requirement increases
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Spares

• IOT Tube
• Class A,A/B Driver Amplifier
• Cavity Window
• Other miscellaneous parts

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Summary

• Final Amplifier/Transmitter Install IOT based
  xmtr, pre-shutdown commission and control system
  program, more efficient, less repair time.
• HVPS Install in new location, no impact to
  current operations. Air cooled (minimal fire
  protection issues).
• Cavity Window Manufacture 2 new windows based
  on existing design, Titanium Nitride coat and
  test in-house.
• RF Feeder/Transmission Line Replace coax line
  with 6 1/8, install higher power loads. All
  items are readily available commercial items.
• Controls Interlock System Replace 60 of
  existing BRF ILCs with SIL 3 rated PLC system,
  new Xmtr control system.
• Utilities There is ample capacity to cover
  both the 480 VAC and LCW requirement increases.
• Spares IOT, Drive Amp, Window to ensure
  operations after the upgrade.

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