Tsukuba-hall webcam

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Beam Pipe and Vertex Detector extraction: on Nov. 10, 2010Belle Detector Roll-out: Dec. 9, 2010End-caps, CDC, B-ACC, TOF extraction: in Jan. 2011

2/21/2011

Machine Design Parameters

parametersKEKB SuperKEKB

unitsLER HER LER HER

Beam energy Eb 3.5 8 4 7.007 GeV

Half crossing angle φ 11 41.5 mrad

# of Bunches N 1584 2500Horizontal emittance εx 18 24 3.2 5.3 nm

Emittance ratio κ 0.88 0.66 0.27 0.24 %

Beta functions at IP βx*/βy

* 1200/5.9 32/0.2725/0.3

0mm

Beam currents Ib 1.64 1.19 3.6 2.6 Abeam-beam

param. ξy 0.129 0.090 0.0886 0.081

Bunch Length z6.0 6.0 6.0 5.0 mm

Horizontal Beam Size x

150 150 10 11 um

Vertical Beam Size y 0.94 0.048 0.062 um

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

1

2/21/2011 2

e- 7GeV 2.6 A

e+ 4GeV 3.6 A

Target: L = 8x1035/cm2/s

SuperKEKB

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)

SuperKEKB and Belle II

32/21/2011

Luminosity prospect

Shutdownfor upgrade

Inte

gra

ted L

um

inosi

ty(a

b-1)

Peak

Lum

inosi

ty(c

m-2s-

1)

Milestone of SuperKEKB

9 month/year20 days/month

Commissioning startsin 2nd half of FY2014

We will reach 50 ab-1

in 2020~2021.

42/21/2011

longer lever armimprove resolution of momentum and dE/dx

Belle Belle IIinner most sense

wirer=88mm r=168mm

outer most sense wire

r=863mm r=1111.4mm

Number of layers 50 56

Total sense wires 8400 14336

Gas He:C2H6 He:C2H6

sense wire W(Φ30μm) W(Φ30μm)

field wire Al(Φ120μm) Al(Φ120μm)

Belle II CDC

normal cell

10~20 mm

18 mm10 mm

6~8 mm

small cell

Belle

Belle II

52/21/2011

Aerogel radiatorHamamatsu HAPD + readout

Barrel PID: Time of Propagation Counter (TOP)

Aerogel radiator

Hamamatsu HAPD+ new ASIC

Cherenkov photon200mm

n~1.05

Endcap PID: Aerogel RICH (ARICH)

200

Ring-imaging Cherenkov detectors

Quartz radiatorFocusing mirror

Small expansion blockHamamatsu MCP-PMT (measure t, x and y)

62/21/2011 Target: 4/K separation @ 4GeV

Belle II Construction Schedule

72/21/2011

Injector upgradeJFY2011 JFY2012 JFY2013 JFY2014 JFY2015

CommissioningCommissioning

AMDAMDCommissioningCommissioning

Study of cathode, cavity and laserStudy of cathode, cavity and laser

System at A1 used for studySystem at A1 used for study

Large aperture accLarge aperture accSystem integrationSystem integration

PF, AR injection 3-1 gunPF, AR injection 3-1 gun

Construction of HER, LER, DR Construction of HER, LER, DR

2011/2/7 8Linac Upgrade for SuperKEKB (Higo)

BPM resolution and BBABPM resolution and BBA

Total systemTotal system

ImprovementsImprovements

Emittance studyEmittance study

Conventional alignment Conventional alignment

3-2 gun 3-2 gun A-1 gunA-1 gun

Improvements in stability & intensity Improvements in stability & intensity

Higher intensityHigher intensity

Main Ring construction schedule

FY2010(H22)

FY2011(H23)

FY2012(H24)

FY2013(H25)

FY2014(H26)

MR commissioning

DR commissioning

Linac commissioning

Remove shields

Set shields

MR TunnelDisassemble KEKB

Beam Pipe

Magnet

QCS

Monitor

Floor

Survey & base plate

Installation, system check, cabling etc.Baking & TiN coating

R&D

Fabrication

alignmentInstallation, cabling

Field measurement

RF

Infrastructure

Fabrication

R&D,design Fabrication Installation, alignment

etc.Field measurement

R&DFabrication, installation

Fabrication, rearrangement etc. R&D,Prototype,test

Design Building ConstructionCooling system2/21/2011 9

Belle II Collaboration

10

13 countries/regions, 57 institutes, 384 collaborators (Jan. 2011)2/21/2011

Mechanical mockup of pixel detector

Zdeněk Doležal

Prototype DEPFET pixel sensor and readout

DEPFET matrix

DCDB

R/O chip

Switcher

control chip

A prototype ladder using the first 6 inch DSSD from Hamamatsu has been assembled and tested.

Full-length (540x570x2200) test chamber has also been made

PXD5 DEPFET matrix

DCDB readout chip, Bump bonded on interface board

Switcher control chip

TB 2009

120GeV

Array of 6 DEPFET modules

TOP Photon detector (MCP-PMT Hamamatsu 16ch MCP-PMT)

Aerogel

Hamamatsu HAPDQ.E. ~33% (recent good ones)

Test Beam setup