L
L Zhang
11 records found
1
Crucial for the field of ultrafast electron microscopy is the creation of sub-picosecond, high brightness electron pulses. The use of a blanker to chop the beam that originates from a high brightness Schottky source may provide an attractive alternative to direct pulsed laser ill
...
Crucial for the field of ultrafast electron microscopy is the creation of sub-picosecond, high brightness electron pulses. The use of a blanker to chop the beam that originates from a high brightness Schottky source may provide an attractive alternative to direct pulsed laser illumination of the source. We have recently presented the concept of a laser-triggered ultrafast beam blanker and argued that generation of 100 fs pulses could be possible [Weppelman et al., Ultramicroscopy 184, 8-17 (2017)]. However, a detailed analysis of the influence of a deflection field changing sign on sub-picoseconds time scale on the quality of the resulting electron pulses has so far been lacking. Here, we present such an analysis using time-dependent, three-dimensional numerical simulations to evaluate the time-evolution of deflection fields in and around a micrometers-scale deflector connected to a photo-conductive switch. Further particle tracing through the time-dependent fields allows us to evaluate beam quality parameters such as energy spread and temporal broadening. We show that with a shielded, "tunnel-type" design of the beam blanker limiting the spatial extent of fringe fields outside the blanker, the blanker-induced energy spread can be limited to 0.5 eV. Moreover, our results confirm that it could be possible to bring laser-triggered 100 fs focused electron pulses on the sample using a miniaturized ultrafast beam blanker. This would enable us to resolve ultrafast dynamics using focused electron pulses in an SEM or STEM.
@en
Journal article
(2010)
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B.C.
Arnold
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B.C.
Arnold
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G
Chen
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G
Chen
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G.
Kim
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G.
Kim
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D.
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D.
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H.
Park
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H.
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D.
Son
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D.
Son
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S.
Song
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S.
Song
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S.
Jung
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S.
Jung
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B.C.
Hong
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B.C.
Hong
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H.
Kim
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H.
Kim
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J.H.
Kim
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J.H.
Kim
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K.S.
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K.S.
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H
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H
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S.
Park
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S.
Park
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J.
Kim
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J.
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M.
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H.
Jeong
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H.
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T.
Kim
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J
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C.
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C.
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S
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S
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P.I.
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P.I.
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J.
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J.
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M.
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M.
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M.
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I.
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I.
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M.S.
Asghar
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M.S.
Asghar
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M.S.
Asghar
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M.A.A.
Awan
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M.A.A.
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M.A.A.
Awan
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I.
Hussain
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I.
Hussain
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I.
Hussain
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M.W.
Khan
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M.W.
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H.
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PGR
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PGR
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M.
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M.
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M.
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M.
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M.
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M.O.
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M.O.
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M.O.
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M.O.
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N.O.
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N.O.
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M.
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J.N.V.
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A.
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VB
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W.
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W.Y.
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S.
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S.
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P.
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P.
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J.G.
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J.G.
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H.Y.
Cheung
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H.Y.
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D.M.J.
Dykstra
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D.M.J.
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S.
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S.
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L.
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MC
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A
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M.
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A.
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R.
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R.
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C.C.
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C.
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P.L.A.
Sturm
(author),
P.L.A.
Sturm
(author),
P.L.A.
Sturm
(author),
I.
PAPADOPOULOS
(author),
I.
PAPADOPOULOS
(author),
D.A.
Horváth
(author),
D.A.
Horváth
(author),
D.A.
Horváth
(author),
N.G.
Toth
(author),
N.G.
Toth
(author),
S.
Bansal
(author),
S.
Bansal
(author),
M.
Jindal
(author),
M.
Jindal
(author),
M.
Kaur
(author),
M.
Kaur
(author),
M.
Mehta
(author),
M.
Mehta
(author),
A.
Sharma
(author),
A.
Sharma
(author),
J.
Maes
(author),
J.
Maes
(author),
A.
Singh
(author),
A.
Singh
(author),
J.
Singh
(author),
J.
Singh
(author),
S
Singh
(author),
S
Singh
(author),
S.
Ahuja
(author),
S.
Ahuja
(author),
S.
Arora
(author),
S.
Arora
(author),
S.
Bhattacharya
(author),
S.
Bhattacharya
(author),
S.
Bhattacharya
(author),
S.
Chauhan
(author),
S.
Chauhan
(author),
P.
Gupta
(author),
P.
Gupta
(author),
S.
Jain
(author),
S.
Jain
(author),
S.
Jain
(author),
S.
Jain
(author),
M.G.V.
Maes
(author),
M.G.V.
Maes
(author),
M.
Jha
(author),
M.
Jha
(author),
A
Kumar
(author),
A
Kumar
(author),
A.
Srivastava
(author),
A.
Srivastava
(author),
R.D.
Choudhury
(author),
R.D.
Choudhury
(author),
D.
Dutta
(author),
D.
Dutta
(author),
A.
Mohanty
(author),
A.
Mohanty
(author),
T.
Aziz
(author),
T.
Aziz
(author),
A.
Gurtu
(author),
A.
Gurtu
(author),
A.
Nayak
(author),
A.
Nayak
(author),
A.
Saha
(author),
A.
Saha
(author),
A.
Marinov
(author),
A.
Marinov
(author),
S.
Banerjee
(author),
S.
Banerjee
(author),
A.
Jafari
(author),
A.
Jafari
(author),
M.
Maggi
(author),
M.
Maggi
(author),
R.T.
Rajan
(author),
R.T.
Rajan
(author),
A.
Perrotta
(author),
A.
Perrotta
(author),
R.
Travaglini
(author),
R.
Travaglini
(author),
R.
Travaglini
(author),
S.
Costa
(author),
S.
Costa
(author),
S.
Costa
(author),
R.
D'Alessandro
(author),
R.
D'Alessandro
(author),
R.
D'Alessandro
(author),
A.
Russo
(author),
A.
Russo
(author),
M.
Michelotto
(author),
M.
Michelotto
(author),
A.
Dimitrov
(author),
A.
Dimitrov
(author),
S.
Ventura
(author),
S.
Ventura
(author),
C.
Riccardi
(author),
C.
Riccardi
(author),
C.
Riccardi
(author),
A.O.
Kraan
(author),
A.O.
Kraan
(author),
L.
Martini
(author),
L.
Martini
(author),
S
Sarkar
(author),
S
Sarkar
(author),
M.
Costa
(author),
M.
Costa
(author),
M.
Costa
(author),
M.
Marone
(author),
M.
Marone
(author),
M.
Marone
(author),
S.
Chang
(author),
S.
Chang
(author),
J.
Chung
(author),
J.
Chung
(author),
D.H.
Kim
(author),
D.H.
Kim
(author)
The CMS Hadron Calorimeter in the barrel, endcap and forward regions is fully commissioned. Cosmic ray data were taken with and without magnetic field at the surface hall and after installation in the experimental hall, hundred meters underground. Various measurements were also p
...
The CMS Hadron Calorimeter in the barrel, endcap and forward regions is fully commissioned. Cosmic ray data were taken with and without magnetic field at the surface hall and after installation in the experimental hall, hundred meters underground. Various measurements were also performed during the few days of beam in the LHC in September 2008. Calibration parameters were extracted, and the energy response of the HCAL determined from test beam data has been checked.
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