liu-abt systems: sps b.balhan, j.borburgh, h.day 20 th november 2015

ZS improvements

LIU-ABT systems: SPS

B.Balhan, J.Borburgh, H.Day

20th November 2015

SPS ZS improvement LIU SPS 3

Outline

20/11/2015

• ZSTF • 1st upgraded ZS • Impedance Measurement results• Design and construction strategy• New Itrap Box dedicated talk G.Raffaele• Design• Budget• Planning • Conclusion

ZSTF Solenoid for e-cloud suppression

Promising, need more tests to confirm before propose to use as a base line for LSS2 extraction line.

420/11/2015 SPS ZS improvement LIU SPS

MD note : https://edms.cern.ch/document/1519435/1

The ZS solenoid appear effective at the ZSTF, with the scrubbing beam in the SPS. Effects can be observed with currents up to 25 A, corresponding to a solenoidal field of approx. 0.65 mT. The vacuum activity wasn’t fully suppressed, and the need to maintain a field in the main gap to see the effect still isn’t understood.

https://edms5.cern.ch/document/1519435/1

1st upgraded ZS


ready to be installed in LSS2 to replace ZS 4 during YETSSince we have to install it between existing MPs, extra cables are required if we like to profit from the additional pumping. DIC in preparation by VSC.Need to decide strategy with RF screen and solenoid.

Hybrid solution, need no move BLM as well !!!

6

ZS and Pumping Module (actual, no screen)


7

ZS and Pumping Module with screen


ZS with new interconnect


Remaining Cavities

ZS with new interconnect and updated screen


ZS Impedance Measurements


Beam Impedance Measurement done by Hugo using wire installed on a spare ZS with simplified elliptical beam pipes (both ends).

Insert and new elliptical beam pipe effectively suppress any longitudinal modes below 1.2GHz. Much better impedance performance longitudinally

Need some feedback from Beam Impedance Team to validate the concept and use it as a base line.


Design and construction strategy

• EN/MME Job created to start August, postponed for LIU priorities (started in November).

• Weekly meeting planned to monitor follow up

• BI part for interconnect still to organise• Tank modifications being finalised at

main workshop still this year (all 10 tanks modified)• VSC qualification of first tank done.• Construction of interconnects to be

subcontracted via EN/MME• Updated RF screen design still to be

validated by impedance team.

EVM

Description ZS improvement activities

Budget codes

99249


Year 2013 2014 2015 2016 2017 2018 2019

PV 80 38 192 403 210 100 77EV 80 38 171AC 80 38 158

Metrics per year in kCHF Cumulative metrics per year in kCHF

Year 2013 2014 2015 2016 2017 2018 2019

PV 80 118 310 713 923 1023 1100EV 80 118 189AC 80 118 277

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Planning• 1/yr tank to be assembled; by LS2 5 tanks ready• 1st tank may already be installed during this YETS• Interconnects to be designed 2016, built in 2017• Purchase of vacuum equipment during continues

for 2 tanks/yr (spares)• Resources available:

• 0.5 FTE cp B (2015 – 2017)• 0.25 FTE cp C (2015 – 2019)• 0.25 FTE cp D (2015 – 2018)• Missing: cp B/C 0.5 (2018 – 2019)


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Conclusions• Concept design finished.• Impedance approach validated with lab

tests. To be endorsed by SPS study group.• First upgraded tank successfully tested

(HV as well as vacuum). • Budget looks reasonable so far.• Lacking technician from 2018 onwards.


THANK YOU FOR YOUR ATTENTION!

liu-abt systems: sps b.balhan, j.borburgh, h.day 20 th november 2015

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