SuperB - ts.infn.it · SuperB design " The design requires state-of-the-art technology for emittance and coupling minimization, vibrations and misalignment control, e-cloud suppression,

SuperB

Daniele Pedrini Consiglio di Sezione INFN Milano-Bicocca

23 Giugno 2011

Sommario •  Fisica •  L’acceleratore •  Stato del progetto e scelta del sito •  SuperKEKB tutte le informazioni riportate sono rintracciabili nel sito del ”XVII SuperB Workshop and Kick Off Meeting”: http://agenda.infn.it/conferenceDisplay.py?confId=3352

23 Giu 2011 2 CdS Gruppo 1

Physics programme in a nutshell

6/23/11

•  Versa&le flavour physics experiment –  Probe new physics observables in wide range of decays.

•  Pa=ern of devia&on from Standard Model can be used to iden&fy structure of new physics.

•  Clean experimental environment means clean signals in many modes.

•  Polarized e− beam benefit for τ LFV searches.

–  Best capability for precision CKM constraints of any exis&ng/proposed experiment.

•  Measure angles and sides of the Unitarity triangle •  Measure other CKM matrix elements at threshold and using τ data.

3 M.A.Giorgi

4

Charm@ : goals

‣  Run at ϒ(4S):

‣  Run at ψ(3770):

✓  Large improvement in D0 mixing and CPV: factor 12 improvement in statistical error wrt BaBar (0.5 ab-1); ✓  time-dependent measurements will benefit also of an improved (2x) D0 proper-time resolution.

✓  coherent production with 100x BESIII data and CM boost up to βγ=0.9; ✓  almost zero background environment; ✓  possibility of time-dependent measurements exploiting quantum coherence.

Unique feature of SuperB

βγ=0.238

βγ up to 0.9

__cc[≈1KHz of ]

6

10

B physics @ Y(4S)

Possible also at LHCbSimilar precision at LHCb

Example of « SuperB specifics » inclusive in addition to exclusive analyses channels with π0, !’s, ", many Ks…

Variety of measurements for any observable

7

τ physics (polarized beams)

Bs at Y(5S)

Charm at Y(4S) and threshold

To be evaluated at LHCb

Bs : Definitively better at LHCb

Benefit from polarised e− beam

very precise with improved detector

Sta&s&cally limited: Ang. analysis with >75ab-‐1

Right handed currents

SuperB measures many more modes

systema&c error is main challenge

control systema&c error with data SuperB measures e mode well, LHCb does μ

Clean NP search Theore&cally clean b fragmenta&on limits interpreta&on

Many unique quality measurements Experiment: No Result Moderate Precision Precise Very Precise Theory: Moderately clean Clean Need labce Clean

8

SuperB Accelerator "   SuperB is a 2 rings, asymmetric energies (e- @ 4.18, e+ @

6.7 GeV) collider with: Ø  large Piwinski angle and “crab waist” (LPA & CW) collision scheme Ø  ultra low emittance lattices Ø  longitudinally polarized electron beam Ø target luminosity of 1036 cm-2 s-1 at the Υ(4S) Ø  possibility to run at τ/charm threshold with L = 1035 cm-2 s-1

"   Design criterias : Ø Minimize building costs Ø Minimize running costs (wall-plug power and water consumption) Ø Reuse of some PEP-II B-Factory hardware (magnets, RF)

"   SuperB can also be a good “light source”: work is in progress to design Sinchrotron Radiation beamlines (collaboration with Italian Institute of Technology)

10

World e+e- colliders luminosity

B-Factories Φ-Factories Future Colliders

1027

1029

1031

1033

1035

0.1 1 10 100 1000

Lum

inos

ity (c

m-2

s-1

)

c.m. Energy (GeV)

ADONE

DCI

ADONE

VEPP-2M

VEPP2000

DAΦNE

BEPC

SPEAR2

VEPP-4M PETRAPETRA

PEPDORIS2

BEPCII CESR

PEP-II

KEKB

LEP

LEP

LEP

LEP

ILC

CLIC

SUPERKEKBSuperB

BINP c-τ

CESR -c

Super Factories

Factories

Linear colliders SuperB

SuperB: highest world luminosity collider ever

SuperB design "   The design requires state-of-the-art technology for

emittance and coupling minimization, vibrations and misalignment control, e-cloud suppression, etc...

"   SuperB has many similarities with the Damping Rings of ILC and CLIC, and with latest generation SL sources, and can profit from the collaboration among these communities

"   For details see the new Conceptual Design Report

(Dec. 2010) on:

http://arxiv.org/abs/1009.6178

Crab-waist scheme Crab sextupoles OFF: Waist line is orthogonal to the axis of other beam

Crab sextupoles ON: Waist aligned with path of other beam Ø  particles at higher ß do not see full field of other beam Ø  no excessive beam-beam parameter due to hourglass effect

Raimondi, Shatilov, Zobov http://arxiv.org/abs/physics/0702033

Plots by E. Paoloni

Parameter Table

Baseline + other 2 options: • Lower y-emittance • Higher currents (twice bunches)

Tau/charm threshold running at 1035

Baseline: • Higher emittance due to IBS • Asymmetric beam currents

RF power includes SR and HOM

•  SuperB has been approved as the first in a list of 14 “flagship” projects within the new national research plan.

•  The national research plan has been endorsed by “CIPE” ( the institution responsible for infrastructure long term plans)

•  A financial allocation of 250 Million Euros in about five years has been approved for the “superb flavour factory”

Approved

money starts to flow

•  At the end of 2010 an initial sum of 19 MEuros has been allocated

•  A sum of the order of 50 is expected for 2011 budget

•  An early allocation of part of the 2011 budget is foreseable before summer

priorities

•  A financial program agreement •  The site choice •  The governance model •  The WBS •  The transition from TDR to construction

phase

first expenses

•  Integrating the team: enrolment of new people

•  Civil engineering projects •  Preliminary site related works

site

•  Requirements: – Extension – Electric power supply – Cooling – Vibrations

•  preferred: at Frascati or nearby

Frascati Site

Need cross-overs

Why not AT frascati

•  Need to go deep underground •  Surface space strongly constrained •  Half below the “Enea” lab •  Strong limitations on possible light

source beamlines •  More difficult evolution into an

international structure

the Tor Vergata option

•  Autonomous interest from a wide community of the University ( not only physicists)

•  First contacts for a feasibility evaluation – Space – Electricity – Water – permits

Site requirements ok in a first approximation

– Extension of the order of 300000 square

meters – 2X150 Kilovolt electric supplies nearby – Water supply adequate and the possibility

of additional supply from a number of pits – Vibration measurements: the good surprise – Site archaeology free

Site under study

LNF

About 4.5 Km

Tor Vergata University campus

Possible layout

Official steps

•  On may 24 a presentation to the academic community

•  A letter from the Dean on May 28 making the site available

•  The decision to move with this solution was taken by the may 29 infn board of directors

•  The site has been decided

Added values

•  Strong role in the civil engineering works

•  University expertise available •  A door to the academic non particle

physics community

governance

•  Three phases –  INFN: the past and present starting phase – Consortium: as soon as possible (less than

a year) as an independent legal entity •  Following main European infrastructures •  More flexibility in the organisation •  Can directly associate foreign partners (EGO

like) •  An “intermediate solution”

– European consortium (ERIC): the final structure

governance

•  A Cern like organisation – A director general and a directorate

•  Departments under director’s supervision – A scientific evaluation committee

•  Science •  Machine

– A finance evaluation committee •  A known and working scheme

the name

•  We are proposing a name for the Consortium – Cabibbo Lab

team

•  Preliminary WBS •  Top responsibilities first •  The team recruitment

–  INFN – Foreign partners – University – New contracts ( about 40 starting within

less than a year period)

SuperB as a light source

•  Soon a workshop for the community at

large •  Within the high energy physics mode a

limited number of beam lines can be accomodated

Source of technological innovation

•  More synergy with CLIC/ILC damping ring studies

•  An occasion to innovate –  Vacuum technologies –  Thermodynamics –  Cryogenics –  Remote controls –  Computing ( grid and high performance )

The computing grid network

•  Size similar to one of the main LHC experiments •  Three-four main centres •  Available also for community oriented services •  Money for the computing centres will come from

a separate source ( estimated a few tens Meuro)

Peter Križan, Ljubljana

Machine design parameters

parameters KEKB SuperKEKB

units LER HER LER HER

Beam energy Eb 3.5 8 4 7 GeV Half crossing angle φ 11 41.5 mrad

Horizontal emittance εx 18 24 3.2 4.3-4.6 nm Emittance ratio κ 0.88 0.66 0.27 0.25 %

Beta functions at IP βx*/

βy* 1200/5.9 32/0.27 25/0.31 mm

Beam currents Ib 1.64 1.19 3.60 2.60 A beam-beam parameter ξy 0.129 0.090 0.0886 0.0830

Luminosity L 2.1 x 1034 8 x 1035 cm-2s-1

•  Small beam size & high current to increase luminosity •  Large crossing angle •  Change beam energies to solve the problem of LER short lifetime


e- 2.6 A

e+ 3.6 A

To get x40 higher luminosity

Colliding bunches

Damping ring

Low emittance gun

Positron source

New beam pipe & bellows

Belle II

New IR

TiN-coated beam pipe with antechambers

Redesign the lattices of HER & LER to squeeze the emittance

Add / modify RF systems for higher beam current

New positron target / capture section

New superconducting /permanent final focusing quads near the IP

Low emittance electrons to inject

Low emittance positrons to inject

Replace short dipoles with longer ones (LER)

KEKB to SuperKEKB


•  5.8 oku yen (~MUSD) for Damping Ring (FY2010) •  100 oku yen for machine -- Very Advanced Research Support

Program (FY2010-2012) •  Full approval by the Japanese government by December 2010;

the project is in the JFY2011 budget as approved by the Japanese Diet end of March 2011

SuperKEKB/Belle II funding StatusKEKB upgrade has been approved

Several non-Japanese funding agencies have also already allocated sizable funds for the upgrade.

àconstruction started!


Facilities

Facilities

Components

Installation

FY2009 FY2010 FY2011 FY2012 FY2013 FY2014

Tunnel construction Building

construction

MR commissioning

RF-gun & laser system

e+ new matching & L-band acc.

R&D Construction

Design studyCommissioning at test stand

e- beam commissioning

move to A1

e+ beam commissioning

Damping Ring

Linac

Main Ring

DR commissioning

A1 gallery extension

Belle II Detector

Components

Installation (KLM) Installation (E-cap)Installation

(Barrel)

Cosmic Ray Test

Ready to Roll-in

R&D Mass Production

BEAST II

Ad-hoc detector for MR commissioning

Construction

Mass FabricationInstallation

Building construction

Mass FabricationR&D, Design

R&D, Design

Construction Schedule of SuperKEKB/Belle II

39

Belle roll-out in Dec. 2010


KEKB/Belle status: official statement

„As is now well known, Japan suffered a terrible earthquake and tsunami on March 11, which has caused tremendous damage, especially in the Tohoku area. Fortunately, all KEK personnel and users are safe and accounted for. The injection linac did suffer significant but manageable damage, and repairs are underway. The damage to the KEKB main rings appears to be less serious, though non-negligible. No serious damage has been reported so far at Belle. Further investigation is necessary. We would like to convey our deep appreciation to everyone for your generous expressions of concern and encouragement.“


KEKB/Belle status Fortunately enough: • KEKB stopped operation in July 2010, and the low energy ring was to a large extent disassembled • Belle was rolled out to the parking position in December. The 1400 tons of Belle moved by ~6cm (most probably by 20cm in one direction, and 14cm back)... We are checking the functionality of the Belle spectrometer (in particular the CsI calorimeter), so far all OK in LED and cosmic ray tests! The lab (Tsukuba campus) has to a large extent recovered from the earthquake, back to normal operation – including the power supply for the computing center for Belle data analysis for summer conferences...


Luminosity upgrade projection

Shutdown for upgrade

Inte

gra

ted L

um

inos

ity

(ab

-1)

Pea

k Lu

min

osit

y (c

m-2s-

1)

Milestone of SuperKEKB

Year

9 month/year 20 days/month

Commissioning starts mid of 2014

Plan: reach 50 ab-1

in 2020~2021

5 ab-1 in 2016

Conclusioni

Il progetto SuperB e` partito.

23 Giu 2011 43 CdS Gruppo 1

backup

"   An overall vibration control design is being developed for the FF magnets. The added measurements of the Frascati site are very encouraging and the fact that the beams tend to move together with QD0 motion has significantly loosened the tolerance requirements on cryostat motion

FF vibrations budget K. Bertsche

Vibrations summary "   Must keep quad motion below 1 µm

Ø Cantilevered cryostat should be designed for low vibration

•  Damp resonances and push > 10 Hz •  Support cryostat on both sides of detector door

"   Must keep cryostat rotation below 2 µrad Ø Avoid building torques into magnet supports

"   Beam feedback should extend to > 100Hz, provide > 10x vibration reduction at LF Ø But we may not even need beam feedback during

quiet parts of day "   Vibration should not be a problem for SuperB at

LNF and Tor Vergata, even at rush hour

SuperB at τ/charm threshold "   It is foreseen that SuperB can also operate at the τ/charm

threshold with a somewhat reduced luminosity: beam energies will be scaled, maintaining the nominal energy asymmetry ratio used for operation at the cm energy of the Υ(4S). All magnet currents will be rescaled accordingly

"   In order to provide the necessary damping at low current wigglers will be installed. Permanent magnets in the IR will be replaced with weaker versions

"   Given all factors, we expect that operations at lower energy will require a decrease of the beam current and an increase of the beam emittance

"   It is thus reasonable to expect a luminosity about 10 times lower than at Υ(4S)

Documents

SuperB - ts.infn.it · SuperB design " The design requires state-of-the-art technology for emittance and coupling minimization, vibrations and misalignment control, e-cloud suppression,