1. Summary of Washington DOE Review
J. Seeman
SLAC
SuperB Frascati Meeting
September 28, 2010

2. US SuperB Team for the Detector and Accelerator Proposals
J. Corlett
D. Hitlin
H. Jawahery
D. Leith
D. MacFarlane
B. Ratcliff
J. Seeman
M. Sullivan
W. Wisniewski

3. US Team Planning for Washington SuperB Talks in July

4. Process of the Washington DOE Review
1) Review three US proposed projects related to flavor physics by a single committee:
g-2 experiment at FNAL in the US
SuperB in Italy
KEKB Upgrade in Japan
2) Each group submitted a “proposal” by July 1, 2010.
3) The group presentations were made in closed sessions on August 10 and 11. Committee deliberated on August 12.
4) The committee consisted of prominent particle physics members around the US. About 10 members plus a half a dozen DOE staff people.
5) Each committee member then provided written comments to the DOE Office of High Energy Physics (OHEP).
6) DOE will combine the results and produce a summary and conclusions in “October 2010”.

5. First Day

6. Second Day

7. Seeman: US SuperB Accelerator Outline
Accelerator consortium
Overview of SuperB technical design
SuperB CDR, INFN/AE-07/2, SLAC-R-856, LAL07-15, March 2007.
SuperB CDR2 (White Paper), June 2010, SLAC-R-953.
Main accelerator physics features of SuperB
Reusing PEP-II components
US accelerator proposal:
Accelerator physics
Interaction region
RF and Longitudinal feedback
Spin Diagnostics
Extended scope possibilities
Conclusions

8. SuperB Accelerator Consortium

9. History of SuperB Accelerator
2001: Early designs emerge for SuperB with high currents
2005: High current design prove difficult to build and afford the power.
2007: Italian scheme (Raimondi et.al.) show that very small by* with crab waist will work.
2007: CDR-1 completed.
SuperB accelerator workshops held every 3 to 5 months.
2008: First accelerator Mini-MAC meeting reviews SuperB design
2009: Second accelerator Mini-MAC endorses SuperB concept.
2010: SuperB CDR-2 completed.

10. SuperB Layout on the INFN Frascati Site

11. SuperB at 1036 with Different and Flexible Parameters
Baseline
1258 m
17 MW
Low emittance
13 MW
High Current
31 MW
Energy (GeV) (LER/HER)
4.2/6.7
by* (mm)
0.20/0.25
0.15/0.18
0.24/0.29
ex (nm)
2.5/2.0
0.9/1.0
sy(mm)
0.036
0.021
0.054 xy
0.095
0.089
0.068
sz (mm) 5
Ibeam (A)
2.4/1.9
1.9/1.5
4.0/3.1
Nbunches
978
1956
Luminosity (1034 cm-2 s-1)
100

14. Reusable PEP-II Components

15. SuperB Magnet List Most from PEP-II
HER
SuperB
LER
Notes
Dipoles (L =5.4 m)
194 80 -
+114
Dipoles (L =4. m) 22
-44
Dipoles (L =2.8 m) 10 6
-16
Dipoles (L =0.45 m)
202
328
-126 (-63)*
Quads (L =0.56 m)
107 81
+14
Quads (L =0.73 m) 54
+27
Quads (L =0.215 m)
Quads (L =0.43 m)
106
353
200
+47
Sexts (L =0.25 m) 2 76 86
-12
Sexts (L =0.30 m)
104 84
+20
Sexts (L =0.35 m) 8 -8
Sexts (L =0.4 m) 4
Need to build 135 magnets out of 1256 needed.

16. US Accelerator Physics Proposal (base research program)
Lattice design
Instability calculation and remediation
Beam-beam calculations
Vibration calculations and suppression
Machine Detector Interface
High Order Mode calculations and mitigation

17. US Accelerator Proposal: IR Magnets
Design and build IR magnets within +/-2 m from IP
Two permanent quadrupole magnets
Ten superconducting quadrupole magnets
Four solenoid compensation magnets
Build IR polarization measurement
Build luminosity monitor
Matches US expertise in magnet design and manufacturing
Match US IR design capabilities
Enhanced program: Build cryostat for these magnets (allows US testing) and beam vacuum chambers (allowing final product delivery).

18. US Accelerator : RF System
Provide guidance to send PEP-II RF system to Italy.
Design new coupler box for RF cavities to provide better power usage.
Design new longitudinal feedback system for SuperB
Enhanced proposal: Build longitudinal feedback system for the SuperB-project.

19. US SuperB Polarization Proposal
LER beam lifetime is 5 to 10 minutes which is too short to polarize naturally.
Inject vertically polarized electrons into the LER ring
Polarized gun (longitudinal) similar to that at SLC.
Transport and manipulate spin to the vertical for ring injection
IR spin manipulation studies
Ring depolarization studies
Polarimeter design and construction

20. US Contributions to SuperB: Conclusions
Overall SuperB project:
Accelerator design is converging with aspects looking feasible.
Lattice, beam parameters, and beam dynamics optimization work is continuing for better performance and with added flexibility.
Component and lattice tolerances with corrections are being studied.
Polarization is progressing studying beam-beam depolarization, polarized gun, and spin measurements.
US contributions were selected to match US desires and strengths:
1) Optimized reused PEP-II components (magnets, supports, RF, vacuum)
2) Design and build new IR PM and SC magnets
3) New Compton polarized beam monitor
4) RF and low level control system design
5) Longitudinal feedback system design
6) If possible, enhanced project to include constructing IR cryogenic system, IR vacuum chambers, and longitudinal feedback electronics: natural extensions.