PS2 meeting 16 April 09

Updates on TT11

Christoph Hessler, Brennan Goddard, Malika Meddahi

PS2 meeting 16 April 09 800 900 1000 1100 1200 1300 1400

2100

2200

2300

2400

2500

2600

2700 PS2, new lattice,moved by 2 cell lengths

TI 2

33 m

SPS

TT10PS2, fodo lattice, original position

PS2, new lattice,moved by 3 cell lengths

2 more cells added in TT11 @ PS2 extraction location (+ 2x21m)

New TT11 layout

PS2 LSS for inj. / extr.

MTEBK ExtKESMS1MS2DuKInjK InjS

BD+1st sec

Prim2nd secMTEBKT

Courtesy W. Bartmann

H- injection

p injection (TT10)

To SPS

Additional 2 cells

EE insertion –version 2

PS2 to SPS

PS2 TT10 TT11

Skew quads

Additional 2 cells

SPS

PS2 to SPSE. ExchangeVersion 2

PS2 to SPSE. ExchangeVersion 2

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For CNGS beam at 50 GeV, with 0.1% dp/p, this dispersion mismatch causes n blowup of 0.5 m in V plane (0.0 m in H plane).

Already looks reasonable – and further optimisation certainly still possible

Performance with emittance exchange version 2

xn [m] yn [m]

PS2 before extraction 15 8

TL after MTE extraction ~4 8

TL after emittance exchange 8 ~4

SPS after filamentation v1 9.3* ~6.6*

SPS after filamentation v2 9.0* ~4.5*

SPS “now” (with MTE) ~8.5* ~4.5*

Normalised emittances from PS2 to SPS for CNGS beam

*assuming 0.5 m n increase from other mismatch sources

Source: Brennan Goddard for PS2 review May 08

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EE insertions: version 3

PS2 to SPS

PS2 TT10TT11

Skew quads

Additional 2.5 cells

SPS

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PS2 to SPSE. ExchangeVersion 3

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PS2 to SPSE. ExchangeVersion 3

No dispersion mismatch

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No dispersion mismatch, no corresponding emittance blow-up!

Performance with emittance exchange version 3

xn [m] yn [m]

PS2 before extraction 15 8

TL after MTE extraction ~4 8

TL after emittance exchange 8 ~4

SPS after filamentation v1 9.3* ~6.6*

SPS after filamentation v2 9.0* ~4.5*

SPS after filamentation v3 8.5* ~4.5*

SPS “now” (with MTE) ~8.5* ~4.5*

Normalised emittances from PS2 to SPS for CNGS beam

*assuming 0.5 m n increase from other mismatch sources

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What’s next?

- Check / correct new geometry- Check optics for other beam types- Aperture- Trajectory correction- Magnet specs