Outline Injection septum SMH42 Injection bumper Resources Conclusion LIU-ABT review 20/11/2015...

Status PS injection septa 2

Outline• Injection septum SMH42 • Injection bumper• Resources• Conclusion

LIU-ABT review 20/11/2015


PS injection septum• Conventional eddy current device


LIU PresentNominal beam energy [GeV] 2.0 1.4Magnetic length [mm] 913 567Septum thickness at the downstream extremity (including magnetic screen) [mm] 5.8 5

Septum thickness at the upstream extremity (including magnetic screen and bumper septum thickness) [mm] 11 n.a.

Magnet gap height [mm] 70 60.4Magnet gap width between conductors [mm] 95 102Nominal deflection angle [mrad] 55 54.7Bgap [T] 0.56 0.689Integrated field strength [T.m] 0.510 0.390Peak current for nominal deflection [kA] 31.2 33.5Field homogeneity in gap (ʃBy.dl on straight line wr.t. centre) [%] ± 1.2 unknown

Pulse length [ms] 2 (full wave) 3.2 (half sine)Max. induced voltage on magnet terminals when injection bumper is pulsed [mV] 30 n.a.

Average duty cycle [s] 1.2 1.2ppm possible yes no


Conventional eddy current septum



Injection septum features


SMH42 ∫Bydl homogeneity

Uses flattened full sine excitation current→ less sensitive to timing jitter.

Uses soft steel end plates to reduce leak field and improve field homogeneity.

Will use copper coated mu-metal beam screen to reduce leak field.


Defined SMH42

• Position in lattice• Magnet aperture• Range of displacement system• Current precision and stability• Field homogeneity• Beam emittance blow up, losses at injection• Beam impedance measures: copper coated

mu-metal beam screen adjacent to septum• Space Reservation Request



Outstanding SMH42


• Engineering specification• ECR• Prototype would be useful to benchmark

simulations with high precision.


Injection bumper septum BSW42

2 GeV system Present 1.4 GeV

Physical length [mm] 350 220Magnetic length [mm] 322 192Septum thickness [mm] 5 >6Magnet gap height between poles [mm] 70 90Magnet gap width between conductors [mm] 145 218Nominal deflection angle [mrad] 13 Bgap [T] 0.375 Integrated nominal field strength [T.m] 0.121 0.127Field homogeneity in gap w.r.t angular deflection in H [%] ± 0.8 Peak current for nominal deflection [kA] 20.9 4.5Pulse width, half sine [ms] 1.0 1.6Max. induced voltage on magnet terminals when injection septum is pulsed [mV] 230 n.a.

Average duty cycle [s] 1.2 1.2ppm possible yes


‘Direct drive like’ eddy current device proposed, using soft steel endplates to improve field homogeneity significantly


Field Quality Injection bumper septum• Magnet very short w.r.t. aperture: poor field

homogeneity due to end fields.• Field homogeneity improved by introducing

‘direct drive like’ geometry and additional soft steel field clamps.



‘Direct drive like’ eddy current septum



Magnetic undershoot of fieldWith half sine pulse, magnetic field shows in simulations post pulse ripple (undershoot).

Presently not confirmed as yet by measurements on prototype.

Mitigation to be found.


0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

-20

0

20

40

60

80

100

120

140

t [ms]∫B

.dl [

mT.

m]


Defined Injection bumper BSW42

• Current tracking precision and stability.• Based on MD measurements with timing variations

between -+20 us. • Based on jitter measurements on existing

equipment.• Field homogeneity.

• Effect of higher harmonics of bumper simulated, but negligible contribution to emittance blow up.

• No beam screen insert in magnet gap.



Outstanding BSW42

• Cross talk between magnets.• First values appear counter intuitive: 30 mV

induced on septum, 230 mV on bumper.• Magnetic post pulse ripple mitigation.• Power convertor characteristics to be

finalised.• Engineering specification (combined with

injection septum).



Mechanical concept design


Coil fixation and copper box insulation defined.

Remote displacement system planned to be recovered from existing system.

EN/MME ‘bureau d’etude’ started. Space Reservation Request submitted. Vacuum equipment still tbd.


Planning Injection septa

• Functional spec frozen by Christmas 2015• ECR Q2 2016• Mechanical concept finalised 2015 • Mechanical design finished Q1 2016• Bumper prototype to be built Q1 2016• Part procurement as from Q3 2016• Assembly and testing 2017


Year 2015 2016 2017 2018 2019

PV 188 485 183 0 30EV 0 0 0 0 0AC 19 0 0 0 0

Metrics per year in kCHF

Cumulative metrics per year in kCHF

PI.SMH42 & PI.BSW42 magnets

Year 2015 2016 2017 2018 2019

PV 188 673 856 856 886EV 0 AC 19


Human resources• Zsolt leaving 31/1/2015, will depend on Miro

and Bruno for calculations.• Mike and Jan available to follow up start of

project in 2016.• No technicians available in 2016 once part

procurement is to start. • EN/MME started in November on mechanical

design based on Mike’s conceptual design• APT data obsolete.



Conclusion• Requirements quasi defined. • Concept design well under way.• Need for prototype bumper magnet

demonstrated by Bruno measuring existing eddy current device.

• Human resources to be clarified.


Status injection equipment 22

DocumentationPS Injection Septa and Bumper Functional spec: (edms 1477011), In work SRR: sent for approval ((edms 1551627) Engineering spec: to be done ECR: to be done

PS Ring MU41 and MU42 Vacuum Chambers Functional specification: (edms 1504265), released ECR (TE/VSC): (edms 1525018) engineering check

LIU-PS meeting 20/10/2015

https://edms.cern.ch/document/1477011/0.1


https://edms.cern.ch/document/1551627/








Outline Injection septum SMH42 Injection bumper Resources Conclusion LIU-ABT review 20/11/2015...

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