1. Status and Plan of GDE Design Work (Including Road Map for RDR)
Feb
PAL
Eun-San Kim

2. ILC Meetings Snowmass, Colorado, 14-17 Aug. 2005 : Started BCD
European GDE meeting, Oxford, 25 Oct
Damping ring workshop, CERN, Nov. 2005
GDE meeting, Frascati, Italy 7-9 Dec
: Decided BCD
1st Area System meeting, KEK, Jan. 2006
: Discussed machine layout and boundary between area systems
Lattice design meeting, CERN, 6-8 Feb. 2006
2nd Area System meeting, FNAL, Feb
GDE meeting, Bangalore, March 2006
3rd Area system meeting, DESY, April 2006
GDE meeting, Vancouver, July 2006
GDE meeting, Valencia, Autumn 2006

3. Frascati GDE Meeting Discussed progress since Snowmass
Finally agreed BCD to be documented.
- includes baseline and alternative designs
Organized the GDE group for RDR in 2006
Final BCD becomes property of CCB in early 2006

4. Frascati GDE Meeting BCD layoutIP
Working Group for BCD
WG1 : LET beam dynamics WG2 : Main Linac
WG3a : Sources WG3b : Damping Rings
WG4 : Beam Delivery WG5 : SCRF Cavity IP

5. Frascati GDE Meeting Matrix group for RDR
C. Adolphsen
H. Hayano
L. Lilje
N. Solyak
J. Gao
S. Guiducci
A. Wolski
D. A-K
A. Seryi
H. Yamamoto
M. Kuriki
J. Sheppard
E.-S. Kim
P. Tenenbaum
A. Brachmann
Area system is geographical breakdown of
machine for design and cost estimation
A. Brachmann

6. 1st Area system meeting Baseline Layout (500 GeV)
1st stage
- 1st stage : 500 GeV
- 2nd stage : 1 TeV ; Moving of turn-around and BC
No moving of DR

7. Electron source in BCD laser 120 keV DC Gun 70-100 MeV
400 MeV SC Linac
Eacc = 17.8 MV/m NC
pre-accelerator
diagnostic section
NC SHB+solenoid
MeV

8. Positron source in BCD To IP Undulator ~100m e- Accelerating structure
To DR
Ti Alloy target
150 GeV e-
Ti Alloy
Target

9. Damping Ring in BCD Baseline e+ : two 6 km rings Alternative
e- : one 6 km ring
Alternative
e+ : 6 km, 17 km
OCS
Baseline

10. DR Tasks List for RDR Lattice design
- 6 km e-/e+ rings : L. Emery, A. Xiao, E-S Kim, Y. Sun
- 17 km e-/e+ rings : Y. Cai, Y. Yan
- Injection and extraction lines : A. Wolski
Acceptance : Y. Cai, Y. Yan, A.Wolski
Low-emittance tuning : J. Jones
Impedance : M. Venturini, K. Bane, S. Heifets, etc
Electron-cloud : M. Pivi, C. Celata, K. Ohmi etc.

11. DR Tasks List for RDR Ion-effects Other collective effects
: L. Wang, E-S Kim, K. Ohmi, M. Venturini, G. Xia
Other collective effects
: S. Mtingwa, M. Venturini, S. Santis, A. Wolski
Injection/extraction kickers : pulser
: J. Urakawa, T. Naito, M. Ross, A. Krasnykh, etc
Injection/extraction kickers : striplines
: A. Krasnykh, S. Santis, D. Alesini, F. Marcellini

12. Baseline Damping Ring Circumference 6.6 km Energy 5 GeV
RF frequency MHz
Harmonic number
Damping time < 25 ms (e+) < 50 ms (e-)
Emittance mm
Bunch length mm
Energy spread < 0.13 %
Momentum compaction x10-4
Damping wiggler peak field T
Damping wiggler period m
Energy acceptance < 0.5 %
Dynamic aperture Ax+Ay < 0.09 m-rad
Baseline configuration lattice Specifications

13. Baseline Damping Ring
Bunch filling patterns for e-

14. Fast-ion effects in Baseline Damping Ring
650 MHz, bunch
Beam size
Sqrt(Jy)
per 50 turns
50 turns

15. Lattice Design of Electron damping ring
One straight section
One Arc and Wiggler section
A lattice with low average beta-functions to reduce the effects of fast-ion.
Tele-conference for e- DR lattice will be at the beginning of March.

16. Ring to Main Linac (RTML) Status and Plans
Started works for shorter bunch compressor and turn-around optics
Contacted leaders of all technical and global systems
Milestone
- Review RTML design and place lattices and documentation under change control in April 2006

17. Ring to Main Linac (RTML)
RTML Layout
Turn around
eny = 0.02 mm, 3.2 nC, sz = 6mm
Total 2.5 km
Bunch compressor
sz = 0.15 mm SR
BC 1
BC 2

18. Ring to Main Linac (RTML)
Bunch compressor
Alternative
Baseline
Chicane
68.4 m
480 m
Matching
4 m
310 m
Number of RF cavity
452
488
Total length
680 m
1400 m
Alternative
Baseline
Required bunch length
achieved
System length
shorter
longer
Tolerence of emittance
acceptable
comparable
BCD
alternative
baseline
GDE
Requirement
correction of vertical dispersion
shorten
system length

19. Ring to Main Linac (RTML)
Bunch compressor
Each BC in baseline has 240 meters of bend magnets arranged in chicanes : Long !
Considering two approaches to reduce length
Enhancing R56 by forcing nonzero dispersion at Qs
Replacing wiggler with 4-bend chicane with optimized lattice functions for emittance preservation

20. Main Linac in BCD Baseline in 1st stage - TESLA cavity type
- Operation gradient = 31.5 MV/m, Qo=1010
Baseline in 2nd stage
- LL or RE cavity type
- Operation gradient = 36 MV/m, Qo=1010
- Total length = 41 km
Alternative in 1st stage
- LL or RE cavity type
- Operation gradient = 36 MV/m
Linac RF basic unit
- 1 modulator, 1 klystron, 3 cryomodules, 27 cavities

21. Beam Delivery System in BCD
Baseline :
- 2 IPs for 2 mrad and 20 mard
- 150 m longitudinal separation between 2 IPs
Alternative :
- 1 IP
2 Interaction Point

22. Summary Bangalore GDE meeting - starting for estimation of costs
RDR will be finished in Dec. 2006
- RDR is not complete technical design,
but is a design to estimate reliable cost.
TDR will be completed in Dec