in Novosibirsk E. Levichev CREMLIN WP7 SCTF Workshop 26-27 May - - PowerPoint PPT Presentation

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in Novosibirsk E. Levichev CREMLIN WP7 SCTF Workshop 26-27 May - - PowerPoint PPT Presentation

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A project of Super charm- tau factory in Novosibirsk E. Levichev CREMLIN WP7 SCTF Workshop 26-27 May 2018, BINP, Novosibirsk, Outline History Technical aspects Status Perspectives Conclusion Long time ago First

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SLIDE 1

A project of Super charm- tau factory in Novosibirsk

  • E. Levichev

CREMLIN WP7 “SCTF Workshop” 26-27 May 2018, BINP, Novosibirsk,

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Outline

  • History
  • Technical aspects
  • Status
  • Perspectives
  • Conclusion
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SLIDE 3

Long time ago…

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First Novosibirsk project

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Second Novosibirsk project (SCTF)

Kick-off meeting held on 7 November 2006. Main specs:

  • 2Е = 34.5 GeV
  • Crab Waist collision
  • Peak luminosity at 2 GeV of 1035 cm-2s-1
  • Longitudinal polarization of electron beam
  • No transverse polarization. Energy calibration

by Compton backscattering (~310-5)

  • Symmetric beam energy at collision
  • No collision monochromatization
  • Positron production rate  11011 е+/с
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Layout (not in scale)

RF RF RF DR e- pol e-/e+ e- e- SS SS SS SS SS W W W W

Legend: W – damping wiggler SS – Siberian Snake RF – accelerating cavity DR – damping ring (1-1.5 GeV) e- – electron source e- pol – polarized e source e-/e+ – conversion system

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SLIDE 7

SCTF location

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Basic parameters

IP: y=0.8 mm, x=40 mm

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Construction

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Status

  • SCTF was approved by Russian Government as one of the six mega-sciences projects.
  • The Government requested final documents by the end of 2019 for the project financing (we

hope).

  • Preliminary Design Report, Conceptual Design Report, Civil Construction Design Report and

Road Map are ready.

  • SCTF officially supported by ECFA.
  • European Commission Expert Group has supported SCTF (Russian Mega Science projects –

evaluation of the potential for cooperation with Europe Experts meeting in Brussels 19 June 2013).

  • MoUs with CERN, KEK, INFN, JINR, John Adams Institute, etc. are signed.
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Documents I

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Documents II

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Ten years after/Tempura mutantur

  • At BES III and LHCb experiments are in progress.
  • Super KEKB has commissioned.
  • Chinese project HIEPA is under consideration.
  • Extremely low emittance light sources are in construction.
  • New Crab Waist projects (FCC-ee, CEPC) are under way.

Super KEKB experience, new projects (FCC-ee, CEPC, HIEPA) with well developed light source technology give a basis for improvement of Novosibirsk SCTF performance.

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Motivations for modernization

  • Beam energy increase at least up to 3 GeV according to

request from experimentalists. (HIEPA promises 3.5 GeV)

  • Realistic design of the FF/MDI area L*= 0.6 m  0.9 m.
  • Short chromatic correction section (designed by Katsunobu

Oide for FCC-ee).

  • Damping wigglers removing (or reduction of their number).
  • Slightly strengthen parameters and additionally increase

luminosity.

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SCTF configuration I

Super Charm Tau Factory Е = 1-3 GeV х  23 nm (w/o IBS)  = 0.5% s10 mm C  800 m 6 straights of ~5 м long Diamond Light Source (UK) Е = 3 GeV х = 2.7 nm  = 0.3% s10 mm C =562 m 18 straights of 5 м long 5 straights of 8 m long By configuration each ring of SCTF is a synchrotron light source with a long straight section for collision. For the last decades many useful accelerator technologies were developed for synchrotron light sources (low emittance, chromaticity correction, DA

  • ptimization, effective injection, coupling correction, etc.) and all of them can be

applied to SCTF.

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SCTF configuration II

w/u – wiggler/undulator ss – Siberian Snake

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Be-tube 150 mm, 30 mm, cooled

Machine-detector interface

IP e+ e-

BPMs Y-chamber, cooled BPMs Compensating solenoid QD0, 200 mm –100 Т/m

  • Corr. coils

QF1, 200 mm 70 Т/m Screening solenoid

L* =

Gradients for 3 GeV FF vacuum chamber Cryostate with FF magnets

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SLIDE 18

Short FF chromatic correction section

Regular scheme K.Oide for FCC-ee Sy Sy Sy Sx Sx Scr Scr 75 м 45 м

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New config/first attempt

C = 634 m instead of baseline 813 м IP Injection and RF

6 HMBA cells (Raimondi proposed for ESRF)

Sy (– I) Sy (– I) Sx (– I)

ss ss ss ss ss

Six-fold ring instead of race-track

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Lattice and parameters

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Conclusion

  • The Novosibirsk Super Charm Tau Factory project is rather

mature.

  • We hope that funding of the project will start in 2020.
  • Internationalization of the project is essential requirement

from Russian Government.

  • Modernization of the collider which promise higher

performance is ongoing.