Post on 20-Jan-2016
description
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ILC e+ Source
Annual DoE SLAC HEP Program Review
Y. Batygin, V. Bharadwaj, R. Miller, Y. Nosochkov, J. Sheppard, J. Wang, and M. Woodley; SLAC
J. Gronberg, T. Piggot, W. Stein, S. Walston; LLNL
J. C. Sheppard, SLAC
June 7, 2006
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ILC Baseline e+ Source Parameters
Note: The SLC e+ source beam power was ~1 kW vs. ~350 kW for ILC
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Layout of ILC Positron Source(BCD: Snowmass Frascati, 2005)
e- sourcee-
DR
e- Dump Photon Dump
e+
DRAuxiliary e- Source
Photon Collimators
Adiabatic Matching
Device
e+ pre-accelerator ~5GeV
150 GeV 100 GeV
HelicalUndulatorIn By-Pass
Line
PhotonTarget
250 GeV
Positron Linac
IP
Beam Delivery System
e- Target
Adiabatic Matching
Device
e- Dump
Photon production at 150 GeV electron energyK=1, =1 cm, 200 m long helical undulatorTwo e+ production stations including a back up.Keep alive auxiliary source is e+ side.
M. Kuriki, KEK
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Note: The web site is under continuous development
( http://www-project.slac.stanford.edu/ilc/acceldev/eplus/ )
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• E166: Demonstration experiment
• Eddy Current Studies
• Target Layout
• Optics development
• Undulator discussions
• NC RF
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Positron yield at 5 GeV (e+/e+target) for undulator based source with E/E 1% for immersed target with Bz= 6T and for shielded target.
Positron System Optics: Capture
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AMD ( Flux Concentrator)
Value Bz, Tesla
00.5
11.5
22.5
33.5
44.5
55.5
66.5
77.5
88.5
99.510
10.511
-1 -0.75 -0.5 -0.25 0 0.25 0.5 0.75 1 1.25 1.5
Z, m
Bz,
Tes
la
Pulsed AMDDC AMD
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Cu Disk
NdFeB Magnet
Strain Gauges
Eddy Current Studies
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Tangential Force vs. RPM
0
0.5
1
1.5
2
2.5
0 200 400 600 800 1000 1200 1400 1600 1800 2000
RPM
Tan
gen
tial Forc
e (
pou
nd
s)
Cu, z=0.01 in
Cu, z=0.05 in
Cu, z=0.1 in
Al, z=0.01 in
Al, z=0.05 in
Al, z=0.1 in
Ta
ng
en
tia
l F
orc
e (
Arb
. U
nit
s)
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Pulsed Flux Concentrator, circa 1965: Brechna et al.
(D. Mayhall, W. Stein, T. Piggot, J. Gronberg, LLNL study)
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A conceptual design for the positron target Eddy currents in a spinning metal disc
Positron Target and AMD (SLAC, LLNL, Liverpool Univ., Daresbury, Cockcroft)
[Pulsed Flux Concentrator for RDR]
100 m/s
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Positron Target and AMD (LLNL)
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Positron System Optics Design~ 18 km of Beam Lines incl. ~2300 magnets
125 MeV-5 GeV LTR Optics Deck
Parts Count Done
Functionality, Operability, Optimization Studies Continuing
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Undulator DevelopmentSLAC, ANL, LBNL, Daresbury
K=1, =1 cm, ID> 4 mm, helical, SC e+ Undulator
What can be done?
What needs to be demonstrated?
Most importantly, how will we work together?
Are formal protocols necessary?
What next?
NOTE: Lund (150/E[GeV] )4x (cm)2 xK-4/3
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• Goal: Evaluate performance of a 1.3 GHz,
NC cavity
• Issues: Significant heating from both rf and particle losses,
must sustain high surface fields (~ 35 MV/m for 1 msec)
Normal Conducting RF Structure Development: SW and TW required for e+ and e- Capture
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SLAC ILC e+ BCD/RDR Summary
All (?) pieces identified
High Level Parts List Complete
Ongoing R&D:
Undulator
Target
AMDs
NC RF
(Remote handling, not started)
Goals
RDR and Cost Estimate, end of calendar 2006
TDR w/ key technology demos, end of calendar 2009