1. Mini-Workshop on BEPCII Background Study
Closing Remarks
Mini-Workshop on BEPCII Background Study
C.Zhang
IHEP, Beijing
March 12, 2008

2. Mini-Workshop on BEPCII Background March 10-12, 2008, IHEP, Beijing

3. Agenda of the Mini-Workshop on BEPCII Background (March 10-12, 2008, IHEP, Beijing)

4. Agenda of the Mini-Workshop on BEPCII Background (March 10-12, 2008, IHEP, Beijing)

14. Electron-Positron Colliders10 29 30 31 32 33 34 35 36 37 1
100
1000
ILC
ADONE
VEPP2000
KEK B and PEP II
KEK B
PEP II
CESR
DAFNE
DAFNE2
BEPCII
CESRc E cm
(GeV)
L (cm -2
sec -1 )
VEPP2M
LEP
TRISTAN
PETRA
VEPP4M
DORIS
SPEAR
BEPC
L (cm-2 s-1)
SUPER
FACTORIES
FACTORIES
COLLIDERS
E (GeV)
C. Biscari, Workshop on e+e- in 1-2 GeV Range, September 10-13, 2003, Italy

15. Peak Luminosity: 1.2069  1034 cm-2 s-1
Design of 135 pb-1

16. Peak Luminosity: 1.7118  1034 cm-2 s-1

17. Crab waist

18. The road to high beam current
Optics optimization：Twiss parameter corrected to design velues, orbit correction, etc.
High beam current: Beam dose cleaning vacuum, RF conditioning, bunch-by-bunch feedback, cooling in beam dusts, etc.
High luminosity：tune scan, collision optimization, single bunch current, more bunches，etc.
As the result, the beam current in collision get higher than 530mA.
Beam current in BER  550mA
Oct 24, 2007 – Jan 31, 2008
We have come a long way
Beam current in BPR  550mA
Oct 24, 2007 – Jan 31, 2008

19. Ninety are only half of a hundred-miles journey
行百里而半九十
Ninety are only half of a hundred-miles journey

20. Phase 3 Commissioning SR Collission: e- ring (BER) + e+ ring (BPR)
SR Operation: Outer ring (BSR)
Phase 1：IR with Conventional magnets
Phase 2：IR With SCQ’s
Phsse 3：BEPCII + BESIII e e+

21. Issues discussed Injection loss and efficiency;
Linac stability and diagnosis;
Masks in the transport line;
Synchrotron radiation in the IR;
Central beam pipe and its shielding;
Particle loss background and its shielding;
Background interlock and beam abort system;
Background simulation;
Masks upstream vs. downstream of the IR;
Continues injection 

22. We learn ...
Physics
Method
Experiment
Experiences
Attitude
Patient

23. BEPC & BESIII Work together
Work to do ...
Accelerator
High current, high luminosity, low loss rate, low background
Optics optimization, lattice correction; injection optimization; to suppress instabilities, CBI, ECI, Ions, etc. 
Beam dose cleaning vacuum, RF conditioning, bunch-by-bunch feedback
Collision optimization, beam-beam effects, single bunch current, luminosity feedback 
Detector
High accuracy, high resolution, more tolerable, low background
Move to IR into IP and shielding after cosmic ray test;
Make the detector work and test with beams;
Study background with low beam current;
Study background with high beam current;
Joint study
BEPC & BESIII
Work together

24. The road to glory is rugged
光荣之路必艰辛
The road to glory is rugged

25. Thank You ...
Guest experts
Speakers
All participants
BEPCII/BESIII teams
Background task force
Foreign Affair & Project Offices 

27. Welcome-to-Beijing Commemorative Medallion

28. Faster Higher Stronger
Mutual Understanding Friendship Unity & Fair Play
New Beijing New Olympic
One World One Dream

29. Welcome to Beijing