Renovation of the 200 mhz rf system
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renovation of the 200 MHz RF system. LLRF issues. Cavities redistribution. 2011 : 4 cavities 2 x 4 sections 2 x 5 sections + 3 spare sections. 2018 : 6 cavities 4 x 3 sections 2 x 4 sections + 1 spare section. Courtesy of Elena Shaposhnikova.

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Renovation of the 200 mhz rf system

renovation of the200 MHz RF system

LLRF issues


Cavities redistribution

Cavities redistribution

  • 2011 : 4 cavities

    2 x 4 sections

    2 x 5 sections

    + 3 spare sections

  • 2018 : 6 cavities

    4 x 3 sections

    2 x 4 sections

    + 1 spare section

Courtesy of Elena Shaposhnikova

14th LIU-SPS Coordination Meeting


1 7 mw amplifier i e 1 4 mw cavity

1.7 MW amplifier, i.e 1.4 MW cavity

  • To have 1.4 MW available at the cavity input, 1.7 MW at the Final output are needed

  • A major improvement to present systems would be to have individual SSA drivers per PA

  • Taking advantage of the long experience we have with tetrodes and combiners, the solution will be 16 x PAs combined through 3 dB combiners

  • Four contracts :

    • Drivers (SSA)

    • Finals (SSA or Tetrodes)

    • Combiners (3 dB above 100 kW)

    • Transmission lines (coaxial, 345 mm outer)

From Beam Control

1/16 splitter

Drivers

16 SSA

Final

16 PAs

1.7 MW

-0.6 dB total

3 dB

combiners

and power loads

1.5 MW

120 m and 180 m

Coaxial lines

-0.2 dB

1.4 MW

To cavity input 120 m away

14th LIU-SPS Coordination Meeting


16 tetrodes vs 2048 ssa

16 Tetrodesvs 2048 SSA

  • Tetrodes tube costs over 20 years will be added :

    • 20 years * 3/4 * 335 * 24 * 16 * 2 =

      3’859’200 total hours

    • With 20’000 hours per tube = ~ 200 tubes

  • SSA :

    • + 20% to 25% additional transistors (not module)

    • Individual circulators are mandatory

  • Wall plug efficiency will be part of the adjudication

    • HVPS included (Tetrodes)

    • Losses in all SSA combiners, circulators and loads included

16 x

106 kW Tetrodes

16 x

128 x 830 W

SSA

1.7 MW

14th LIU-SPS Coordination Meeting


First upgrade present amplifiers

First upgrade: Present amplifiers

14th LIU-SPS Coordination Meeting


More power with present amplifiers

More Power with Present amplifiers

  • Increase filament voltages :

  • Very expensive (562’000 CHF -> 1’111’000 CHF per year)

  • Effective efficiency not tested !

  • Additional down time

14th LIU-SPS Coordination Meeting


More power with present amplifiers1

More Power with Present amplifiers

  • HVPS Siemens improvements :

    • Full re-cabling

    • Air cooling modification

  • Philips amplifiers improvement :

    • Air cooling modification

  • ‘pre-modifications’ during next 2011-2012 Xmas stop to test new configuration during a MD in 2012 :

    • TX3 Siemens HVPS

    • TX5 Air cooling

Siemens HVPS need a full re-cabling with new cable spacers

Siemens HVPS need an air cooling improvement

14th LIU-SPS Coordination Meeting


More power with present amplifiers2

More Power with Present amplifiers

  • Driver over coupled trick already used nowadays on all TXs

  • Maximum Power strongly proportional to BW

  • Driver over coupled trick already used nowadays on all TXs

Pout [kW]

BW -3dB [MHz]

14th LIU-SPS Coordination Meeting


Present amplifiers bw

Present amplifiers BW

  • The effective BW of the 1-Turn feedback is limited by

    • The TX gain BW: When the TX gain drops by ~ 20 dB, the overall loop has no more gain

    • The TX phase non-linearity: When the phase shift exceeds +-50 degree the overall loop gain must have dropped by more than 20 dB to keep the system stable

  • Conclusion: Good correction only in the band limited by +-30 deg phase non-linearity, and with an effectiveness that drops as the TX gain BW

14th LIU-SPS Coordination Meeting


Bw specifications

BW specifications ?

  • New plan :

    • Present amplifiers connected to 3 sections cavities with higher bandwidth than 4 and 5 sections as per nowadays

    • New amplifiers connected to 5 sections cavities

  • What is the acceptable BW limit ? :

    • For ‘Siemens’ and ‘Philips’

    • For new amplifiers

  • 2018 : 6 cavities

    4 x 3 sections

    2 x 4 sections

    + 1 spare section

14th LIU-SPS Coordination Meeting


Operation modes on a match power load

Operation modes (on a match power load)

14th LIU-SPS Coordination Meeting


Operation modes on a match power load1

Operation modes (on a match power load)

14th LIU-SPS Coordination Meeting


New rf building

New RF building

  • No more ‘Power’ in BB3 Faraday Cage

  • Specific ‘Power’ control room in new RF building, Cavity controllers, Conditioning systems, amplifiers monitoring

  • BB3-FC large enough for 6 systems ?

14th LIU-SPS Coordination Meeting


Draft schedule

Draft schedule

Year 1

Year 2

Year 3

Year 4

Year 5

Year 6

Year 7

2011

2012

2013

2018

2014

2015

2016

2017

Cavities re-arrangement within a LS ( > 6 months)

RF :

Studies (amplifiers, couplers, cavities, LLRF)

Tendering (s)

Build new hardware

Install

Commissioning

Tunnel :

Studies

Build New hardware

Installation phase 1

(pickups + dampers + EL + coax lines …)

Installation phase 2

(cavities + pickups + CV + EL + vacuum)

Building:

Studies

Authorizations

Building

Services

Services

14th LIU-SPS Coordination Meeting


Llrf beam control open issues

LLRF/Beam Control open issues ?

  • What is the acceptable lower BW limit ? :

    • For ‘Siemens’ and ‘Philips’

    • For new amplifiers

  • Technical Specifications ?

  • BB3-FC large enough for 6 systems ?

  • Is a 3 sections cavity available in new RF building earlier useful ?

  • Is the draft schedule still correct ?

    • Time table

    • Resources

    • Money

  • How many time for commissioning without/with beam ?

  • What if LS2 earlier ? (later ?)

  • What else ?

14th LIU-SPS Coordination Meeting


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