E-203
Number of shifts requested:
Preference for number of shifts in a single
continuous block:
Preference for time between blocks of shifts:
20 split into two lots of 10
No more than 2, preferably one.
Average of one a day.
Very important to have TCAV and E-206 measurements concurrent with our data taking.
We can cover the periods from 11 March to 7 April as well as 20 May to 30 June.
The later run might only have a team of 3 (quite thin) and would benefit from short blocks to allow for recovery.
Beam Request:
Parameter
Location of
waist (e.g.
centre of
apparatus)
Transverse spot
size (σxxσy) in
microns
Bunch length
(σz) in microns
Request 1 –
Longitudinal profile
studies
Double Waist- E-203 and
a waist suitable for
TCAV parallel
measurement during the
same shift
Significantly less than a
mm.
5-10 different bunch
lengths in the range of
compressed to
Request 2 – Transverse
spot size study
Request 3 – Low
Charge Study
Request 4 –
Background studies
Waist at center of E-203
SPR chamber
Waist at center of E203 SPR chamber
Waist at center of E203 SPR chamber
We will ask for the spot
size to be varied to study
effects of transverse spot
size on the measurement.
We request 5 to 10
different spot sizes well
spaced in the range 50 to
500 microns.
Compressed.
Significantly less than a
mm.
Significantly less than a
mm.
Compressed.
Compressed.
uncompressed.
We accept all bunch
profiles- no need to tune
structures.
We will need to have the
same or similar profile
measurements many
times to check for
consistency.
2e10
2e10
1e9
(Desire to match 150pC
LCLS current as closely
as possible)
Beta_x, Beta_y
(or length of
structure at IP)
Grating is 4cm long.
Grating is 4cm long.
Grating is 4cm long.
Charge variation from
maximum (2e10 or
more) to minimum
(~1e9) to study how
much of signal and
background are
coherent.
Grating is 4cm long.
We need to know the
transverse size of bunch
at E-203 SPR chamber so
it may be useful to use
nearby profile monitors
with close to the same
beta function (if no other
method is available).
We need to know the
transverse size of bunch
at E-203 SPR chamber so
it may be useful to use
nearby profile monitors
with close to the same
beta function (if no other
method is available).
Tolerable jitter
(specify
parameter)
Tolerable charge jitter
1%
Tolerable bunch length
jitter 1%…
Tolerable charge jitter
1%
Tolerable bunch length
jitter 1%…
We need to know the
transverse size of bunch
at E-203 SPR chamber
so it may be useful to
use nearby profile
monitors with close to
the same beta function
(if no other method is
available).
Tolerable charge jitter
1%
Tolerable bunch length
jitter 1%…
We need to know the
transverse size of bunch
at E-203 SPR chamber
so it may be useful to
use nearby profile
monitors with close to
the same beta function
(if no other method is
available).
Tolerable charge jitter
1%
Tolerable bunch length
jitter 1%…
Charge (e/bunch)
Time required
to take data at
each distinct
config
Beam Rate
Additional
Comments
Tolerable position jitter
10 micron
20 minutes at each
setting to take our data.
Tolerable position jitter
10 micron
20 minutes at each
setting to take our data.
10 Hz
Shot to shot variation of
the charge and all other
parameters should be as
low as possible as we
average each
measurement over many
100 shots and only have
limited ability to correct
for variations in these
parameters
10 Hz
Shot to shot variation of
the charge and all other
parameters should be as
low as possible as we
average each
measurement over many
100 shots and only have
limited ability to correct
for variations in these
parameters
Tolerable position jitter
10 micron
20 minutes to take our
data. We will make
repeat measurements
with the grating at
several different
proximities to the beam.
10 Hz
Shot to shot variation of
the charge and all other
parameters should be as
low as possible as we
average each
measurement over
many 100 shots and
only have limited
ability to correct for
variations in these
parameters
Tolerable position jitter
10 micron
20 minutes to take our
data.
10 Hz
Shot to shot variation of
the charge and all other
parameters should be as
low as possible as we
average each
measurement over
many 100 shots and
only have limited
ability to correct for
variations in these
parameters