Renovation of the 200 mhz rf system
Download
1 / 15

renovation of the 200 MHz RF system - PowerPoint PPT Presentation


  • 116 Views
  • Uploaded on

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'renovation of the 200 MHz RF system' - tyra


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
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