LHC Injector Synchrotrons 2012

LHC Injectors: SPS Q20 operational

Q20 Q26

• Operational since September 2012

• Remove or ease intensity limitations in the SPS

• No hardware change• Very smooth

transition, allowing brighter beams at LHC injection

• All LHC beams (proton and ions) delivered with Q20 optics

• Still some work to do in the LHC!!!

LHCH. Bartosik, Y. Papaphilippou

19/06/2013 ABP Group Meeting - LIS - G. Arduini 2

LHC injectors: BCMS becomes reality…

a) Double batch injection from PSB (4 + 4 bunches, 8 bunches for PS at h=9)b) Up to 5 batches of 48 bunches each transferred to the SPS (240 bunches)

3h = 9 h = 21

h = 9 10 1112 13 14 7 21

h =

21

42

84

+4 bunches4 bunches

BC

MS

“Bat

ch C

ompr

essi

on, M

ergi

ng a

nd S

plitt

ing

in P

S”

S. Gilardoni + RF teamNb

[1011 p/b]e*

[mm]

Bunches per batch

(@ PS ext.)25 ns 1.15 2.8 72

25 ns BCMS

1.15 1.4 48

50 ns 1.65 1.7 36

50 ns BCMS

1.6 1.2 24

@SPS extraction

19/06/2013 ABP Group Meeting - LIS - G. Arduini

LHC Injectors: Ions• Excellent quality ion beams for

the p-Pb run• Started systematic

measurements to:– Characterize the qualify the beams

coming from Linac3– Characterize the machine

parameters (e.g. chromaticity)• To understand low energy

losses and potential performance limitations

19/06/2013 ABP Group Meeting - LIS - G. Arduini 4

M. Bodendorfer, C. Carli, collaboration

with HSL

MTE-related activities

5

-15

-10

-5

0

5

10

0 100 200 300 400 500 600

Beta

-bea

ting

(%)

S-position (m)

H-beating V-beating

Measured PS beta-beating

Entry of SS15 Entry of SS16

• Validation of the dummy septum scheme

• Review of extraction 16 extraction spin-off: reduction of losses for other operational beams

• LHC tools and techniques successfully applied to the injectors’ chain!

Octupolar Resonance Driving Terms

M. Giovannozzi (LCU), S. Gilardoni, C.

Hernalsteens, A. Lachaize

19/06/2013 ABP Group Meeting - LIS - G. Arduini

PS-LIU studies: Space charge

V ert i

calt

une

Horizontaltune

dNN

3q

x

?

qy

=1

?qx+3qy =13qx

+

qy

=1

?qx +3qy =0

?

3q

x

+

qy

=0

3qx

+

qy

=1

qx+3qy =1

2qx+2qy=1

4qy =1

4qx

=1

qx+2qy =1

2qx

+

qy

=1

?2qx

+

qy

=0

?qx+2q

y =0

3qy =1

3qx

=1

?qx+qy

=0

6.05 6.10 6.15 6.20 6.25 6.30 6.35 6.40 6.45 6.50 ?0.03

?0.025

?0.02

?0.015

?0.01

?0.005

0

6.05

6.10

6.15

6.20

6.25

6.30

6.35

6.40

6.45

6.50

(e) Tunescanconducted fromleft to right without compensation.

V ert i

calt

une

Horizontaltune

dNN

3q

x

?

qy

=1

?qx+3qy =13qx

+

qy

=1

?qx+3qy =0

?

3q

x

+

qy

=0

3qx

+

qy

=1

qx+3qy =1

2qx+2

qy=1

4qy =1

4qx

=1

qx+2qy=1

2qx

+

qy

=1

?2qx

+

qy

=0

?qx+2q

y =0

3qy =1

3qx

=1

?qx+qy

=0

6.05 6.10 6.15 6.20 6.25 6.30 6.35 6.40 6.45 6.50 ?0.03

?0.025

?0.02

?0.015

?0.01

?0.005

0

6.05

6.10

6.15

6.20

6.25

6.30

6.35

6.40

6.45

6.50

(f) Basis of this plot is a scan in the same direction asin (e), but this time fourskew sextupoleswereindependently powered inorder toreducetheresonance3qy =1.Additionally, adecreaseinthestrengthof2qx+qy=1 isvisible.

Verti

calt

une

Horizontaltune

dNN

3q

x

?

qy

=1

?qx +3qy =13qx

+

qy

=1

?qx +3qy=0

?

3q

x

+

qy

=0

3qx

+

qy

=1

qx+3qy =1

2qx+2qy=1

4qy =1

4qx

=1

qx+2qy=1

2qx

+

qy

=1

?2qx

+

qy

=0

?qx+2q

y =0

3qy =1

3qx

=1

?qx+qy

=0

6.05 6.10 6.15 6.20 6.25 6.30 6.35 6.40 6.45 6.50 ?0.06

?0.05

?0.04

?0.03

?0.02

?0.01

0

6.05

6.10

6.15

6.20

6.25

6.30

6.35

6.40

6.45

6.50

(g)Tunescanconductedfromtoptobottomwithout compensation(thetwolinescloseto3qx =1 areinterpolationartifacts).

V ert

icalt

une

Horizontaltune

dNN

3q

x

?

qy

=1

?qx+3qy =13qx

+

qy

=1

?qx +3qy =0

?

3q

x

+

qy

=0

3qx

+

qy

=1

qx +3qy =1

2qx+2qy=1

4qy =1

4qx

=1

qx+2qy=1

2qx

+

qy

=1

?2qx

+

qy

=0

?qx+2q

y =0

3qy =1

3qx

=1

?qx+qy

=0

6.05 6.10 6.15 6.20 6.25 6.30 6.35 6.40 6.45 6.50 ?0.06

?0.05

?0.04

?0.03

?0.02

?0.01

0

6.05

6.10

6.15

6.20

6.25

6.30

6.35

6.40

6.45

6.50

(h) Basisofthisplot isa scanin thesamedirectionasin (g), again with activeskewsextupolesforcompensation. Theresonance3qy=1 seemstobecompletely suppressedandthebene?cial in?uenceon2qx+qy =1 isalsovisible.

Scan direction

Scan d ire ct io n

A. Huschauer

• Pushing the space charge limit..

• Resonance compensation (3QV=19) successfully applied with 4 skew sextupoles.

• Open possibility to optimize injection working point towards higher Qv.

• In parallel: optics modelling at 1.4 and 2 GeV and space charge simulations (ORBIT-PTC, MICROMAP)S. Gilardoni, A.

Huschauer, R. Wasef, collaboration with GSI,

ICE, LCU

No resonance compensation

Resonance compensation

19/06/2013 ABP Group Meeting - LIS - G. Arduini 6

PS-LIU studies: PS TFB

• The PS TFB could damp the PS H-T instability with an uncoupled machine for all tested working points (tunes and chromaticities).

G. Sterbini + BE/RF

The PS TFB can delay the onset of an instability observed on the 25 ns LHC by 10 ms providing a significant margin during operation.

19/06/2013 ABP Group Meeting - LIS - G. Arduini 7

Comparison with external excitation

measurements

simulations

Mod

e am

plitu

de [r

ad]

Comparison with 10 MHz RF system mode

ω/ω0

Rs [

Ω]

Quality factor 2

Shunt impedance (Ω) 1.5x103

Total beam intensity (ppb) 9x1012

Measurement resultsMode

Number1 2 3

Rise time 400ms

333ms

1s

ωr = 5ω0 … 9ω0rise time ≈ 340 ÷ 500 ms

simulations:

PS-LIU: Longitudinal stability

L. Ventura, M. Migliorati (ICE) in collaboration with BE-RF

19/06/2013 ABP Group Meeting - LIS - G. Arduini 8

PSB-LIU studies: Space Charge• Understanding of the

features of the space charge simulation codes (ORBIT-PTC)

• Detailed simulations of the injection process in the presence of space charge. HL-LHC type beams

19/06/2013 ABP Group Meeting - LIS - G. Arduini 9

• Experiments to benchmark codes

E. Benedetto, V. Forte, M. Martini,

collaboration with ICE

PSB-LIU studies: Optics Model• Detailed optics

measurements to build the PSB magnetic model:

– To provide realistic simulations of space charge effects

– to provide deterministic resonance compensation schemes

• Preliminary tests with turn-by-turn orbit acquisition systems

• Orbit response analysis providing useful input concerning linear optics errors and misalignments

19/06/2013 ABP Group Meeting - LIS - G. Arduini 10

C. Carli, M. McAteer (oPAC), R. Tomàs(LCU), collaboration with

SU

Extra Low ENergy Antiproton ring ELENA

• Aim: Improve capture efficiency of experiments (traps)– Decelerate antiprotons coming from the AD at 5.3 MeV down to

100 keV– Electron Cooler to increase phase space density of beams

delivered• In full swing for the Technical Design Report preparation (end of this

month) and Review (September)19/06/2013 ABP Group Meeting - LIS - G. Arduini 11

Injection with magnetic septum (≈340 mrad)and kicker (84 mrad)

High sensitivity magnetic Pick-up forSchottky diagnostic (for intensity) and LLRF

Extraction towardsexisting experiments(with fast electrostatic deflector) Wideband RF cavities

(similar to new PSB ones)

Scraper for destructive emittance measurements

Electron Coolerand compensation solenoids

Extraction towardsnew exp. zone

C. Carli (PL), S. Maury (DPL), T. Rijoff,

collaboration with ICE (A. Burov)

HP-PS design• Study of a High-Power PS with a

2MW proton beam for neutrinos (LAGUNA-LBNO)

• Based on superferric magnets for reaching energy of 50 (or 75) GeV

• 3-fold symmetric with NMC arcs and doublet straights (adapted from PS2)

• Optics design and single particle dynamics almost completed

• Collimation studies in progressJ. Alabau, A. Alekou, F.

Antoniou, Y. PapaphilippouLAGUNA – LBNO EU activity

19/06/2013 ABP Group Meeting - LIS - G. Arduini 12

BIO-LEIRKTT funded• Options for low energy front-end

(2nd Linac3 source or other solution) under study (HSL)

• Study of a slow extraction in LEIR well advanced

• Sextupole+Septa and bumper scheme devised

• Conceptual Design Report in preparation.

C. Carli, A. Garonna, (collaboration with

HSL)

19/06/2013 ABP Group Meeting - LIS - G. Arduini 13

Challenges ahead• 2012 has still been dominated by the effort for

operation but as you see effort on Projects has grown significantly thanks to (new) staff, external collaborators, fellows and students

• In 2013 projects will take the main emphasis while preparing for the start-up in 2014-15

• I believe that we (all) can only benefit of the partnership between projects (even more if they have tight links with the group…) and group/sections (=expertise). Let’s profit of that!!

19/06/2013 ABP Group Meeting - LIS - G. Arduini 14

19/06/2013 ABP Group Meeting - LIS - G. Arduini 15

Many thanks for the sustained effort and

congratulations for all the achievements