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-- NigelWatson - 07 Jan 2008

Installation (0th Week)

  • Installation in extraction line
  • Laying cables
  • PC installation (inc. network)
  • Checking everything works
  • Check PC readout with ATF
  • Investigate microscope options

Shift Plan (1st Week)

  • Basic sample parameters: max. of 40 y strips, with 200um separation in x. Vertical spacing within a strip should be 100um.
  • For scanning operation, to move 8000um in 80 steps of 100um, needs speed of 100um*0.78Hz, i.e. 0.078mm/s.

Log from 21/2/2008

  • James has set up optics as well as was possible. Configuration saved as: set08feb21_2249.dat
  • Charge is approx. 1.5x10^10,
  • Beam size measured at MW2X, MW3X, data files not yet pulled across from ATF control system:
  • Estimate of beam size at target is sig_x, sig_y = 20, 10 um^2
  • Find edges of sample, at 0.78Hz, charge approx. 1.5 e10.
  • Found lower left edge. Some small rotation of sample (see screen shot from ~2345).

first_second_try_annotated_1.jpg

  • Strip 1 3mm from left hand edge, starting with sample above beam, then translated sample down by 6mm, when it reached end of travel, beam turned off from ATF control.
  • We actually ran first strip at 0.078mm/s, even though rep rate was 1.56 Hz, hence samples are only spaced by ~50um in y.
  • Sample then moved vertically, by 6 mm to clear from beam position for when beam is next on.
  • We decided to turn beam on below sample and turn off at end of travel (on target), ie moving from A to B in the figure below. This is because beam position is expected to be more unstable when first turned on, possibly moving around by unusually large amounts, scattering bunches across the sample.

first_second_try_annotated_2.jpg

  • Strip 2 moved sample left by 200um. Keep rep rate 1.56 Hz, but adjust translation speed to 0.156mm/s.

  • Strip 3 moved sample left by 200um. Keep rep rate 1.56 Hz, also with translation speed to 0.156mm/s.
Next, attempt to hit single spot multiple times
  • Do this on lower left edge (exposed sample, underneath sample holder):
  • Move sample down approx. 1mm above lower edge, onto exposed sample underneath the thick sample holder.
  • Move sample towards right ~500um, then after approx. 5 bunches at same location, move further 500um horizontally in same direction, then after approx. 10 bunches at next location, translate 500um horizontally, then approx. 20 bunches, then translate off edge of sample. Seen as horizontal series of red dots, in above figure.

Next, Luis' "mega sample", in which he makes a fourth vertical strip, well separated horizontally from strip 3. This translates sample vertically at a rate of 0.5mm/s, stopping 10 times and placing approx. 10 bunches in steps of 1mm.

Some small concern that there may be slippage of horizontal moter or beam movement, to be investigated further.

Plan for Friday 22/2/2008

  1. Swapping polarity of quadrupole QD6X (with Terenuma-san). Expected to improving spot size at target. Use the 1300-1700 slot to do this.
  2. Small modifications to labview vi made. Continue with study of beam size optimisation if improved quadrupole currents are predicted to allow further spot size optimisation.
  3. Use multiple bunch operation, as per 21/2, to make 1-2 strips of hits
  4. Follow with first use of single pulse operation
  5. Repeat with 1-2 strips of continuous operation hits, all of 3-5 with same beam size/charge.
  6. Move onto next charge of beam size configuration.
  7. End of shift: return optics to nominal settings, access to remove sample and replace with second sample.

Log from 22/2/2008

  • With bunch size: (x,y)=(,), charge=1.0e10, ..., etc.


Shift Plan (2nd Week)

As with 1st week but with new sample.

Plus some time dedicated to removing all equipment (Friday afternoon?)

  • first_try.bmp: First screen dump from initial commissioning test

Topic attachments
I Attachment HistorySorted ascending Action Size Date Who Comment
PowerPointppt first_second_try_annotated.ppt r1 manage 210.5 K 2008-02-21 - 18:27 NigelWatson Annotated version of screen dump images
JPEGjpg first_second_try_annotated_1.jpg r1 manage 76.6 K 2008-02-21 - 18:02 NigelWatson First screen dump from initial commissioning test
JPEGjpg first_second_try_annotated_2.jpg r1 manage 76.5 K 2008-02-21 - 18:31 NigelWatson  
Bitmapbmp first_try.bmp r1 manage 2304.1 K 2008-02-21 - 16:43 NigelWatson First screen dump from initial commissioning test
Bitmapbmp second_try.bmp r1 manage 2304.1 K 2008-02-21 - 16:46 NigelWatson Second screen dump from initial commissioning test
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Topic revision: r7 - 2008-02-22 - NigelWatson
 
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