E-203

Number of shifts requested: / 20 split into two lots of 10
Preference for number of shifts in a single continuous block: / No more than 2, preferably one.
Preference for time between blocks of shifts: / 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 / Request 1 – Longitudinal profile studies / Request 2 – Transverse spot size study / Request 3 – Low Charge Study / Request 4 – Background studies
Location of waist (e.g. centre of apparatus) / Double Waist- E-203 and a waist suitable for TCAV parallel measurement during the same shift / Waist at center of E-203 SPR chamber / Waist at center of E-203 SPR chamber / Waist at center of E-203 SPR chamber
Transverse spot size (σxxσy) in microns / Significantly less than a mm. / 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. / Significantly less than a mm. / Significantly less than a mm.
Bunch length (σz) in microns / 5-10 different bunch lengths in the range ofcompressed to 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. / Compressed. / Compressed. / Compressed.
Charge (e-/bunch) / 2e10 / 2e10 / 1e9
(Desire to match 150pC LCLS current as closely as possible) / Charge variation from maximum (2e10 or more) to minimum (~1e9) to study how much of signal and background are coherent.
Beta_x, Beta_y (or length of structure at IP) / 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). / 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). / 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). / 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).
Tolerable jitter (specify parameter) / Tolerable charge jitter 1%
Tolerable bunch length jitter 1%…
Tolerable position jitter 10 micron / Tolerable charge jitter 1%
Tolerable bunch length jitter 1%…
Tolerable position jitter 10 micron / Tolerable charge jitter 1%
Tolerable bunch length jitter 1%…
Tolerable position jitter 10 micron / Tolerable charge jitter 1%
Tolerable bunch length jitter 1%…
Tolerable position jitter 10 micron
Time required to take data at each distinct config / 20 minutes at each setting to take our data. / 20 minutes at each setting to take our data. / 20 minutes to take our data. We will make repeat measurements with the grating at several different proximities to the beam. / 20 minutes to take our data.
Beam Rate / 10 Hz / 10 Hz / 10 Hz / 10 Hz
Additional Comments / 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 / 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 / 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 / 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