Upload
rashad
View
31
Download
0
Tags:
Embed Size (px)
DESCRIPTION
g g option. T.Takahashi Hiroshima Univ. June 28 2006. Principle of gg , e g Collider. laser. e beam. cp. e beam. ip. laser. Spectrum, polarization, depends on electron/laser polarization. h. g. g. electron polarization is essential,,,, both beam should be electron. Physics. - PowerPoint PPT Presentation
Citation preview
T.Takahashi Hiroshima
option
T.Takahashi Hiroshima Univ.
June 28 2006
Principle of , e Collider
e beam e beam
laser
laser
cp ip
Spectrum, polarization, depends on electron/laser polarization
h
electron polarization is essential,,,, both beam should be electron
T.Takahashi Hiroshima
Physics
• (h->)Br(h->bb) ~ 2%
– sensitive to heavy partilces
• Heavy Higgs– reach up to 0.8Sqrt(ee)– H coupling sensitive to SUSY parameters– sesitive to CP properties
• Linear pol, HA mixing– But need experimental studies
• SUSY– large cross section but large BG
• WW, tt coupling
h/H/A
T.Takahashi Hiroshima
Lasers for Photon Colliders
• have to meet– 5J/pulse– 337ns separaton 3000bunches/train – 5Hz
• simple estimate of cost for the laser– to pump 5J ×3000 pulses in 1ms
5 300050 $250
1 (0.3)
Jpumping power MW M
ms eff
$5/w
T.Takahashi Hiroshima
Technical Issues
• Lasers and optics– high power, high repetition– pulse stacking cavity
• larger beam crossing angle– 25mr?
• beam dump – collimated gamma beam– spent e- beam w/ large angular spread
• Optics at IP region – < 5-7degree dead
T.Takahashi Hiroshima
current idea
Gronberg
Nanobeams 2005 – Kyoto – October 17-21, 2005J. Gronberg - LLNL
The MERCURY laser already has more average power than we need
Goal:• 100 J• 10 Hz • 10% Efficiency• 2-10 ns • < 5X Diffraction limit • > 108 shots
Output
Diode arrays• 8 diode arrays• 6624 diodes total• 730 kW peak power
Front-end• 300 mJ
Gas-cooledamplifier heads• Helium gas flow at 0.1 Mach
Cavity Laser:• 764 W average power• 119 kW peak power
Gronberg
requirement for Cavity
~$10M for each ( need 2+
T.Takahashi Hiroshima
a detector w/ cavity
T.Takahashi Hiroshima
beam crossing angle
• Bottom line
10d mr QD0
d
Qx
*L
QR
x d Q
e-
Laser
beam simulation
Q depend on QD and FF optics
20x mr strawman design by MDI group
T.Takahashi Hiroshima
20-25
new bend for additional
2.5mr
move detector 1.8m
new tunnel for beam dump
T.Takahashi Hiroshima
work for 25mr
T.Takahashi Hiroshima
Beam extraction
e-
Laser
e-
beamstrahluong
Compton
out going electron 10mr-12mr
beamstrahlung 3-4mr 1m at 250m from IP
Compton g ~40rx15r 1cmx0.35cm at 250m
T.Takahashi Hiroshima
beam dump
T.Takahashi Hiroshima
Detector modification
T.Takahashi Hiroshima
Klaus
T.Takahashi Hiroshima
switching e+e- <->
• move beam line and detector to 25mr• replace forward/backward region of detector• Install laser system• replace beam dump • position to electron
a lot of job,,,, takes years?
When should we go to ?
T.Takahashi Hiroshima
When go to
• Indication of Heavy Higgs• some hints of CP violation in higgs sector?• something unexpected
after 500 GeV e+e- then back to e+e- at 1TeV?
go to 1TeV e+e- anyway then switch to
or
or
,,,,,,,,,,,,,,
T.Takahashi Hiroshima
Summary• Options have to be read when needed but switching
takes some,,,• technical issues to be developed
– pulse stacking cavity – beam dump
• issues to be decided – linac configurations for large crossing angle– compatibility of detector
• low angle region can be removable?• never mind?
– entire end-cap or detector will be replaced
depends on physics (time scale for the switching)