TTakahashi Hiroshima University 25 Septemer 2012 LCWS2012 Arlington TX Collaborators V Strakhovenko O Dadoun R Chehab AVariola L Rinolfi O DadounTKamitani ID: 927905
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Slide1
Hybrid Target R&D
at KEK-LINAC
T.TakahashiHiroshima University
25 Septemer 2012LCWS2012, Arlington, TX
Collaborators:
V. Strakhovenko O.
Dadoun
, R. Chehab,
A.Variola
, L.
Rinolfi
, O.
Dadoun,T.Kamitani
,
T.Suwada
,
T.Omori
,
J.Urakawa,K.Furukawa
,
K.Umemori,M.Satoh,T.Sugimura,S.Kawada
,
T.Akagi
, Y.
Uesugi
Slide2ContentsStatus of previous experiments
Temperature measurement 2012 JanuaryProspects
Slide3Hybrid target for positron sourceA away to reduce thermal load in positron targets
proposed by Chehab, Variola, Strakhovenko->
Experimental study to accumulate data on e+ yields, heat deposit,,,
Feasibility as a positron source for LCs
e
-
e
+
,
e
-
,
g
g
e
-
e
+
e
+
Slide4hybrid souce for CLIC
Slide5Setup
8GeV e-
1mm
W crystal
Sweeping Magnet
0.96T 0.75m
amorphous W
8 mm
18 mm
Analyzing magnet
5 ~ 30MeV
Slide6pictures
e- 8GeV
W Crystal
on the goniometer
Sweeping
magnet
Slide7pictures
movable stage
amorphous
targetsthermocoupoles
attached back end
Slide8The dataHybrid
Conventional
e 8GeV
sweep
mag
1mm W Crystal
on axis (aligned to the beam)
off axis (not aligned to the beam
)
e 8GeV
amorphous W
1.75, 3.5, 5.25, 8, 18mm
temperature
at the end of
the
targets by
thermocouplesand infrared camerapositrons fromthe targetmomentumanalyzedg
Slide9positron yield (
arb. unit)angle of crystal axis<111> w.r.t. beam (
mr)rot. in vertical plain
e
sweep
mag
8
mm
R
ocking
curve
same for horizontal rotation
Preliminary
factor
3
enhancement
Slide10e+ yield
amorphous thickness [mm]e+ detected [
a.u]
P=20MeVNeed simulation for analyzing the magnet collimator , detector to evaluate e+ yeilds
Slide11Detector acceptanceSimulation of the is in progress by Y.Uesugi
Slide12simulation in progress
Very Preliminarylow acceptance 0.0005e+/e- takes time for simulation
Target Thickness (mm)
e+ yield (A.U)
Slide13Temperature measurement w/ thermocouples
back plane of
amorphous target
thermocouple
approximately 1mm x 1mm
to fast data logger
read temperature
each 10ms
bunch by bunch temperature variation
PEDD information by thermocouple
temperature at equilibrium
total energy deposit
Slide14Example ofTemperature Measurement
Temperature of the 8mm amorphous target for the hybrid case
Time from Beam On (Minutes)
Temperature (degree Celsius)
Base temp. 23.3
℃
D
T
～
32
℃
Preliminary
Slide15T
vs total energy deposit
hybrid
on axis
conventional
18mm
8mm
T at
equilibrium
has information for
total energy deposit except for 18mm hybrid
target is thicker than shower
max
hybrid off axis
T at equilibrium (
deg
)(simulation)(measured)
Slide16bunch by bunch temp.
dT provides a measure of PEDD
hybrid
on axis
conventional
hybrid off axis
Simulation
Measured
Slide17Making thermo couple array
thermocouples
temperature distribution of amorphous target
bunch by bunch bases
design in progress at Hiroshima
Slide18temperature measurementJanuary 2012
Slide19temperature measurement
Slide20e+ yields
v.s. PEDD ~G4~
e- s=4.0mm
hybrid (5GeV 8GeV) s=2.5mm
e-
s
=1.0mm
hybrid
(5GeV 8GeV)
s
=1.0mm
PEDD on Amorphous Target(
GeV/cm^3/e-)
e+/e-(in DR aperture)
e+/e-(in DR aperture)
conventionalconventionale- s=2.5mmconventionals: beam size on amorphous s: beam size on crystal
Slide21e+ yields
v.s. PEDD ~G4~
e- s=4.0mm
hybrid (5GeV 8GeV) s=2.5mm
e-
s
=1.0mm
hybrid
(5GeV 8GeV)
s
=1.0mm
PEDD on Amorphous Target(
GeV/cm^3/e-)
e+/e-(in DR aperture)
e+/e-(in DR aperture)
conventionalconventionale- s=2.5mmconventionals: beam size on amorphous s: beam size on crystal
Making this
plot is a purpose of this experiment, but if it is the case;
A hybrid works, why not a conventional（but worthwhile studying better crystals)
Slide22summaryS
ystematic data for hybrid target R&Dyield from various target thickness, momentum G4 Simulation in progressenergy deposit/temperatureThermocouple array worksin progress. G4 simulation is ready.
Systematic data in next experiments（but we need to wait for full recovery of KEKB LINAC)
Slide23experimental
site KEKB LINAC
Switch yard
８
GeV
e-
～
nc
/bunch
upto
25Hz single bunch
After the earthquake: beam recovered to 3GeV
8 GeV operation expected later half of 2012