PARTICIPATION IN THE DESIGN AND R&D ACTIVITIES FOR A FUTURE LINEAR COLLIDER:

A. Faus-GolfeIFIC - Valencia

Accelerator and Detector aspects

FPA2005-02935

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Outline

• Scientific project Main goals

Accelerator Physics Machine Detector Interface Detectors

• Personnel & Task

See Carlos Lacasta’s Talk

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Scientific project: Main Goals

Our project pretends to initiate/consolidate the participation of the IFIC to the ILC effort in both aspects:

Machine Detector Interface

Machine Detector

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The IFIC participation has already started with:

• A feasibility study of a non-linear collimation system for CLIC in 2002 in collaboration with CERN. A doctoral thesis started in the beginning of 2004: ”Design and Performance Evaluation of a Nonlinear Collimation System for CLIC and LHC” (CERN doctoral students program)

• Participation in the European Project CARE-ELAN in the beginning of 2004

• Participation in the specific design study EUROTeV, approved in late 2004

Scientific Project: Main Goals Accelerator aspects

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Scientific Project: Main Goals Accelerator aspects Feasibility of a non-linear collimation system for

– Design Optics

– Non-linear impact on the BDS

– Cleaning efficiency

– Spoiler survival

– Application to other collimation systems (LHC, ILC)

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Ongoing work:

Scientific Project: Main Goals Accelerator aspects

•Design Optics–Optics with bends between the skews shows better performance from the collimation efficiency point of view but there is no complete cancellation of the geometric aberration and the luminosity is very poor–New optics with no bends between the skews to avoid the luminosity degradation keeping good collimation efficiency[T.Asaka, A.Faus-Golfe, J.Resta López, D. Schulte and F. Zimmermann “Alternatives Design for Collimation system” To be published ]

See A. Faus-Golfe talk

in Nanobeam 05 and CLIC BDS Day

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1st optics solution:SkSk Sp

No bends between the skews

Scientific Project: Main Goals Accelerator aspects

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2nd optics solution: Sk SkSp

Bends between the skews

Scientific Project: Main Goals Accelerator aspects

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Ongoing work: • Collimation survival

– install perfect spoiler & perform simulations with MAD and PLACET

[T.Asaka, J. Resta López “Characterization and Performance of the CLIC BDS with MAD, SAD and PLACET” ELAN (2005)]

– consider real spoiler with scattering, install absorbers, optimize absorber locations, run BDSIM or SIXTRACK or MARS simulations (linear system already contains spoilers and absorbers)

[Drozhdin et al, “Comparison of the TESLA, NLC and Beam Collimation system performance” CLIC Note 555 (2003)]

• Chromatic properties & Luminosity performance & Beam size at the spoiler vs sextupole strength & average momentun off-set

See J. Resta López talk in

CLIC BDS Day

Scientific Project: Main Goals Accelerator aspects

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Optics lattice

MADPlacetSAD

…

Entrance:IP:

Multiparticle tracking

Beam-beaminteraction

Guinea-Pig

performancetransport

Lie

Importance of the benchmarking of codes

Scientific Project: Main Goals Accelerator aspects

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Scientific Project: Main Goals Accelerator aspects

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Scientific Project: Main Goals Accelerator aspects

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Scientific Project: Main Goals Accelerator aspects

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Scientific Project: Main Goals Accelerator aspects

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Scientific Project: Main Goals Accelerator aspects

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Scientific Project: Main Goals Accelerator aspects

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Scientific Project: Main Goals Accelerator aspects

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Scientific Project: Main Goals Accelerator aspects

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Scientific Project: Main Goals Accelerator aspects

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Scientific Project: Main Goals Machine Detector InterfaceDesign study of the disrupted and energy degraded beam after the IP. Impact in the tracking performance. Simulations based on realistic beam conditions including the halo:

• identify and estimate losses in the spent beam transport line

• study of installation of relevant post-IP beam diagnostic (luminosity, energy and energy spread and polarisation monitors)

Collaboration: A doctoral thesis started in the beginning of 2005: ”Design and Performance Evaluation of the MDI system for the ILC” (EU doctoral students program)

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Ongoing work:

•Beam parameters for e-e- mode operation at the ILC–e-e- shows sharper deflection curves (feedback slower) and faster luminosity drop with offset (more stringent constraints on residual offset) that makes feedback very difficult

–Alternative beam parameters: increase of y (steepness can

be reduced at the expense of a factor 2 in L) and decrease x (smoother deflection curve and partly recovered L at the expense of a factor 2 in b)

[C.Alabau, P.Bambade and A.Faus-Golfe, “Beam-Beam parameters for e-e- mode operation at ILC” To be published ]

See C. A

labau talk in

ECFA S

tudy on P

hysics and

detectors

for I

LC

Scientific Project: Main Goals Machine Detector Interface

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-300

-200

-100

0

100

200

300

-75 -25 25 75

y-offset (nm)

Bea

m 1

ou

tgo

ing

y-a

ng

le (

m rad

)

σy=σyo

σy=2σyo

σy=3σyo

σy=5σyo

0

1E+33

2E+33

3E+33

4E+33

5E+33

-75 -25 25 75

y-offset (nm)

Lu

min

osi

ty (

cm-2s

-1)

σy=σyo

σy=2σyo

σy=3σyo

σy=5σyo

e-e- Deflection Angles (σx=σxo)

Increasing y

Scientific Project: Main Goals Machine Detector Interface

e-e- Luminosity (σx=σxo)

1.5

2

2.5

3

3.5

4

-75 -25 25 75

y-offset (nm)

B (

%)

σy=σyo

σy=2σyo

σy=3σyo

σy=5σyo

e-e- Beamstrahlung Loss (σx=σxo)

- better deflection curve

- similar beamstrahlung energy loss

- lower luminosity (factor 2)

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-500

-300

-100

100

300

500

-30 -20 -10 0 10 20 30

y-offset (nm)

Bea

m 1

ou

tgo

ing

y-a

ng

le (

m rad

)

e-e-nominalσy=5σyo

σy=7σyo

σy=10σyo

σy=12σyo

e+e-(beam2)

0

1E+33

2E+33

3E+33

4E+33

-30 -20 -10 0 10 20 30

y-offset (nm)

Lu

min

osi

ty (

cm-2

s-1) e-e- nominal

σy=5σyo

σy=7σyo

σy=10σyo

σy=12σyo

e-e- Deflection Angles (σx=0.5σxo) e-e- Luminosity (σx=0.5σxo)

- better deflection curve / luminosity

- greater beamstrahlung energy loss

2

3

4

5

6

7

8

-30 -20 -10 0 10 20 30

y-offset (nm)

B (

%)

e-e- nominal

σy=5σyo

σy=7σyo

σy=10σyo

σy=12σyo

e-e- Beamstrahlung Loss (σx=0.5σxo)

problems for physics?

problems for beam extraction

(maximum ~5-6%)

Scientific Project: Main Goals Machine Detector Interface

Decreasing x

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Personnel & Tasks

TASK PERSONNEL

Feasibility of a non-linear collimation system A. Faus-GolfeParticle tracking along BDS J. Resta Lopez

Machine Detector Interface A. Faus-Golfe J. Fuster Verdú C. Alabau Pons

R&D on Si Detectors C. Lacasta LlacerParticipation on the design of tracking system J. Fuster Verdú Post-doc I. Carbonell Mechanical Eng.

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Other related Project: Accelerator aspects

Further work:

Beam Instrumentation for TBL at CTF3/CLEX:

– Mechanics

See F.Toral and Y. Kubyshin talks