Laser Based Polarized e + e + Source for ILC 8th ACFA LCWS@ Daegu 11-14/Jul/2005 Tsunehiko OMORI...
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Transcript of Laser Based Polarized e + e + Source for ILC 8th ACFA LCWS@ Daegu 11-14/Jul/2005 Tsunehiko OMORI...
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Laser Based Polarized ee++ Source for ILC
8th ACFA LCWS@Daegu 11-14/Jul/2005
Tsunehiko OMORI (KEK)
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Why laser based?i) Full energy/intensity e- beam is NOT necessary to produce positrons. Therefore, Electron and positron systems remain independent. Easier development, easier commissioning, easier operation.
ii) No problem of low energy operation of the collider.
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Today’s talk
2. Concept of Laser Based Polarized e+ Source for ILC
1. Experiment at KEK-ATF
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Experiment at KEK-ATF
120 m
Experiment done by Waseda-TMU-KEK collaborationATF: Accelerator Test Facility for ILC built at KEK
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i) proof-of-principle demonstrations
ii) accumulate technical informations: polarimetry, beam diagnosis, …
Experiment@KEK
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-rayMeasured Asymmetry
A= -0.93± 0.15 % A= 1.18± 0.15 %laser pol. = - 79 % laser pol. = + 79 %
M. Fukuda et al., PRL 91(2003)164801
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Ne+ = 3 x 104/bunch
Asym (expected) = 0.7%Pol(expected) = 80%
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polarized e+
Measure e+ polarization : use Bremsstrahlung -ray
Pb conveter
-ray
E = 40 MeV
calculation
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e+ polarization (e+ run :June)e- spin in Iron
e- spin in Iron
e- spin in Iron
e+ beam spin
e+ beam spin
e+ beam spinnon
A(R)= +0.60± 0.25%
A(L)= -1.15± 0.27%
A(0)= -0.03± 0.26%
preliminary results
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Summary of Experiment1) The experiment was successful. High intensity short pulse polarized e+ beam was firstly produced. Pol. ~ 80%
3) We established polarimetry of short pulse & high intensity -rays, positrons, and electrons.
2) We confirmed propagation of the polarization from laser photons -> -rays -> and pair created e+s & e-s.
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Concept of Laser Based polarized e+ source
for ILCThanks to Many Freiends,Especially K. Moenig, J. Urakawa, K. Yokoya
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We had a conceptual design for a warm LC. ~ 100 bunches in ~ 300 nsec, bunch to bunch : ~2.8 nsec, 1.2x1010 positrons/bunch, pol. ~ 54%.
T. Omori et al., NIM A500 (2003) 232-252
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Conceptual Design
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Conceptual Design for warm LC
T. Omori et al., NIM A500 (2003) 232-252
Ne+=1.2x1010/bunch Ne+/N=1.4%
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Is this applicable to a cold LC?
Yes ! With New and Improved design
Full use of slow repetition rate (5Hz)
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ILC requirements2x1010 e+/bunch (hard)3000 bunches/train (hard)5 Hz (we have time to store e+s)
Strategy
New: Design for cold LC (ILC) make positrons in 100 m sec. Electron storage ring, laser pulse stacking cavity : Re-use !!! positron stacking ring.
Old: Design for warm LC make positrons at once. both electron & laser beams : single path
Basic Idea: K. Moenig P. Rainer
T. Omori et al., NIM A500 (2003) 232-252
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Laser Pulse Stacking CavityInput laser (CO2 laser) Energy 10 mJ/bunch 2.8 nsec bunch spacing train length = 50 sec
Cavity Enhancement Factor = 50
Laser pulse in cavity 500 mJ/bunch single bunch in a cavity
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Schematic View of Whole System
Ne+/N= 0.5%
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Strategy 2
New: Design for cold LC (ILC) Ne+/N = 0.5 % Take Higher Energy e+s = better emittance (good both for stacking & damping) = Higher polarizaton (target: 80 %)
Old: Design for warm LC Ne+/N = 1.4 % Pol e+ = 54%
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Laser based scheme is good candidate of ILC polarized e+ source.
Summary of ILC source design
We have new Ideamake positrons in 100 m sec. Electron storage ring laser pulse stacking cavity positron stacking ring
2x1010 e+/bunch x 3000 bunches @ 5Hzwith high polarization (target 80%)
Most of values are extrapolation from old design.We need detailed simulation.
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Slides to answer questions
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