20130228 Shift

Plan

• Set detector attenuation to 9dB as normal
• Save a set file

• Load optics
• Minimise background
• Dispersion measurement
• Dispersion correction
• OTR measurement for emittance and coupling
• Coupling correction
• Background minimisation
• Save set file

• OTR - focus by eye
• OTR - quad scan by eye
• OTR - few images at focus for idea of size
• Alignment for collisions

• Vertical, horizontal, phase to optimise
• NL vertical

• Save set file
• NL vertical for 6 different charges / gun settings

• Decide what setting gives best signal to background level and set
• Adjust detector attenuation and record

• Quad scan - quick vertical, full horizontal, NL vertical - 3A or 4A steps - make sure to go really far out for approximately 10um on either side
• Set to minimum

• quick vertical, Horizontal (full and detailed), NL vertical

• Vertical scans at different horizontal offsets - 0, +-50, +-100, +-200

• if time premits - quad scan with only quick vertical and horizontal and NL vertical

• Tidy up - requires 1hr
• Last thing - OTR repeat of Quad scan
• Restore optics

3.25 START

• Acces to install energy meter and check alignment

• Alignment and timing around 5 am.

Horizontal Alignment	Vertical Alignment

• 5 dB attenuation now, tweak green crystal

• 200 pulse log : 20130301_0619_log.dat

• Tunes: H = 0.170533; V = 0.569211

06:30

• Dispersion measurement and correction using FlightSimulator tools. Improved vertical dispersion, but made horizontal slightly worse.
• Lost collisions during frequency ramp of dispersion measurement.
• Clicked timing back and forth and tried a feew phase settings.
• Phase scan to recover
• Found collisions but not nearly as high as before.
• Needed to reoptimise all three axes in the end as the beam had shifted.

• position saved: 20130301_0659_pos.dat
• setfile saved : set13mar01_0659.dat

NL Vertical: 50 steps, 20 samples

• 20130301_0841_lws.dat - signal vs laser energy - exhibits saturation! Gun intensity 1% just now, charge around 0.2 10^10.
• 20130301_0845_lws.dat - signal vs laser energy - gun intensity 3%, charge around 0.3 10^10
• 20130301_0851_log.dat - charge correlations with laser 170 us
• 20130301_0857_log.dat - charge correlations with laser 80 us
• 20130301_0904_log.dat - charge correlations with no laser
• 20130301_0910_log.dat - 1000 pulse log of background
• 20130301_0916_log.dat - 1000 pulse log on peak
• 20130301_0923_log.dat - 1000 pulse log off peak

Quad Scan - 10:00... to infinity and beyond..

• Quick vertical 5 samples, 10 steps, 20um range
• Horizontal 10 samples, 30 steps, -1500 +1500
• NL vertical 20 samples, 50 steps, nl range

* Had to retime at 12:50. 100% modulation of signal corresponding to wrapping on phase shifter. Scanned in phase, but same behaviour so shifted to RF bucket one less in delay and scanned phase again - worked just fine. Back on. Continue quad scan.

QM14FF Current	Quick Vertical	Horizontal	NL Vertical
80
83
86
89
92
95
98
101
104

Horizontal	Vertical

• Setting QM14FF to 91.92A and repeating measurements here.

• Set file set13mar01_1357.dat
• DR Tunes: H:0.1731 V: 0.5729

• Repeat nonlinear vertical, this time with 20 samples but 70 steps.
• Repeat nonlinear vertical, this time with 30 samples but 40 steps.

• Nonlinear horizontal to test it out - it works - woo!

OTR Quad Scan

3x2 Binning	3x5 Binning
Z:/dat/otr/20130228_shift/quad_scan_3x2.txt	Z:/dat/otr/20130228_shift/quad_scan_3x5.txt

Vertical Slices at different horizontal locations

• Nonlinear horizontal scan to ascertain centre. H centre: 196.
• Do NL Vertical with 30 samples, 40 steps at H centre +- 100, 200, 300um

Another Quad Scan