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ERL
ERL Laser Development Plan
in JFY2007
KURIKI Masao (KEK)
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15 May 2007 ERL meeting
KEK / JAEA ERL Project team
1
ERL
Basic Requirement (1)
Parameters
Micro pulse length
Pulse reputation
Charge per pulse
Peak current
Emittance (norm.)
Laser energy per pulse (*)
Laser power (*)
Laser wave length
1.3 Ghz
77pC
7.7A
rad
12 nJ
15 W
800nm, tunable
* 1% cathode QE and 100mA beam current are assumed.
15 May 2007 ERL meeting
KEK / JAEA ERL Project team
2
ERL
Basic Requirement (2)
►Initial emittance
x
–h -
R h
kT
0
2 3 mc2 mc2
can be 20meV, R=1mm > ~0.01nm @5GeV (0.1 μrad
norm)
0
►To obtain the minimum
emittance, the laser
wavelength should be
optimized to the band gap,
which depends on the
cathode material/structure.
15 May 2007 ERL meeting
KEK / JAEA ERL Project team
3
ERL
Basic Requirement (3)
►Full demonstration is not
possible with this 500nm
laser, but its could be
achieved partly with trade
Eg=1.5 eV
offs among
●Emittance,
●Beam current,
●Bunch length,
●Beam size, etc.
15 May 2007 ERL meeting
KEK / JAEA ERL Project team
4
ERL
Laser R&D Road Map
Kobayashi and Itatani
15 May 2007 ERL meeting
KEK / JAEA ERL Project team
5
ERL
15 May 2007 ERL meeting
Ti:S oscillator + Yb fiber amp.
KEK / JAEA ERL Project team
6
ERL
Er oscillator + Er-Yb fiber amp.
15 May 2007 ERL meeting
KEK / JAEA ERL Project team
7
ERL
Start up with Ti:S oscillator
►Ti:S oscillator is applicable and upgradeable to
– Initial cathode/gun test.
– Seed for Yb fiber amplifier -> 500nm
(SHG)
– Seed for OPA ~ 800nm.
►Start with a narrow band 1.3 Ghz Ti:S oscillator
►Upgrade to an ultra-wide band 1.3Ghz Ti:S
oscillator
15 May 2007 ERL meeting
KEK / JAEA ERL Project team
8
ERL
JFY 2007
►Infrastructure for Laser R&D.
– Work Space : AR north
– Temperature and humidity controlled clean booth
(6x3.5m) : purchase
– Optical table (4x1.5m) : recycle
– Optical parts : purchase
►Refine the R&D strategy.
►Investigation for laser companies.
►Purchase Ti:S oscillator if any resource was available.
►Is anything possible with a smaller budget?
15 May 2007 ERL meeting
KEK / JAEA ERL Project team
9

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