(r7) RunPlan < ILCBDSColl

ILCBDSColl Web>RunPlan (revision 7) (raw view)~~EditAttachPDF~~

-- Main.NigelWatson - 07 Jan 2008 <br /> <br />
---+ Installation (0th Week)<br />
   * Installation in extraction line
   * Laying cables
   * PC installation (inc. network)
   * Checking everything works
   * Check PC readout with ATF
   * Investigate microscope options<br />

---+ Shift Plan (1st Week)<br />

   * 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<br />
   * James has set up optics as well as was possible. Configuration saved as: set08feb21_2249.dat
   * Charge is approx. 1.5x10^10,<br />
   * Beam size measured at MW2X, MW3X, data files not yet pulled across from ATF control system: <br />
   * 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).

<img alt="first_second_try_annotated_1.jpg" src="%ATTACHURL%/first_second_try_annotated_1.jpg" /><br /><br />
   * *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 <b><span style="color: red;">A</span></b> to <b><span style="color: red;">B</span></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.

<img alt="first_second_try_annotated_2.jpg" src="%ATTACHURL%/first_second_try_annotated_2.jpg" /><br /><br />
   * *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<br />
   * 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.<br />

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.<br />
---++++ *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.<br />
   1 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.<br />
   1 Use multiple bunch operation, as per 21/2, to make 1-2 strips of hits
   1 Follow with *first use of single pulse operation*
   1 Repeat with 1-2 strips of continuous operation hits, all of 3-5 with same beam size/charge.
   1 Move onto next charge of beam size configuration.
   1 End of shift: return optics to nominal settings, access to remove sample and replace with second sample.<br />
---+++ Log from 22/2/2008
   * With bunch size: (x,y)=(,), charge=1.0e10, ..., etc.

<br />
---+ Shift Plan (2nd Week)
As with 1st week but with new sample.<br /><br />Plus some time dedicated to removing all equipment (Friday afternoon?)<br /><br />
   * [[%ATTACHURL%/first_try.bmp][first_try.bmp]]: First screen dump from initial commissioning test

   * [[%ATTACHURL%/second_try.bmp][second_try.bmp]]: Second screen dump from initial commissioning test

Attachments

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

Topic revision: r7 - 2008-02-22 - NigelWatson

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