Extraction Line Laser-wire 24 th January 2013 A.Aryshev, G.A.Blair, S.T.Boogert, L.Corner, L. Nevay,...
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Transcript of Extraction Line Laser-wire 24 th January 2013 A.Aryshev, G.A.Blair, S.T.Boogert, L.Corner, L. Nevay,...
![Page 1: Extraction Line Laser-wire 24 th January 2013 A.Aryshev, G.A.Blair, S.T.Boogert, L.Corner, L. Nevay, P.Karataev, N.Terunuma, J.Urakawa, R.Walczak.](https://reader033.fdocuments.us/reader033/viewer/2022051622/5697c0261a28abf838cd589e/html5/thumbnails/1.jpg)
Extraction Line Laser-wire
24th January 2013
A.Aryshev, G.A.Blair, S.T.Boogert, L.Corner, L. Nevay, P.Karataev,
N.Terunuma, J.Urakawa, R.Walczak
![Page 2: Extraction Line Laser-wire 24 th January 2013 A.Aryshev, G.A.Blair, S.T.Boogert, L.Corner, L. Nevay, P.Karataev, N.Terunuma, J.Urakawa, R.Walczak.](https://reader033.fdocuments.us/reader033/viewer/2022051622/5697c0261a28abf838cd589e/html5/thumbnails/2.jpg)
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Laser-wire Setup
Detector
e-
ATF-II Extraction Line New IP
![Page 3: Extraction Line Laser-wire 24 th January 2013 A.Aryshev, G.A.Blair, S.T.Boogert, L.Corner, L. Nevay, P.Karataev, N.Terunuma, J.Urakawa, R.Walczak.](https://reader033.fdocuments.us/reader033/viewer/2022051622/5697c0261a28abf838cd589e/html5/thumbnails/3.jpg)
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Operations
• Operations during March – June• No operations during Autumn
• Goal of 1 micron laser-wire scan
• Full characterisation of laser-wire
![Page 4: Extraction Line Laser-wire 24 th January 2013 A.Aryshev, G.A.Blair, S.T.Boogert, L.Corner, L. Nevay, P.Karataev, N.Terunuma, J.Urakawa, R.Walczak.](https://reader033.fdocuments.us/reader033/viewer/2022051622/5697c0261a28abf838cd589e/html5/thumbnails/4.jpg)
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Results• Many scans between 0.9 and 1.5 um• Non-Gaussian shape as expected from laser
![Page 5: Extraction Line Laser-wire 24 th January 2013 A.Aryshev, G.A.Blair, S.T.Boogert, L.Corner, L. Nevay, P.Karataev, N.Terunuma, J.Urakawa, R.Walczak.](https://reader033.fdocuments.us/reader033/viewer/2022051622/5697c0261a28abf838cd589e/html5/thumbnails/5.jpg)
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Consistent Picture• Not always so good• Beam drift
― much improved now due to linac feedback
• Bpm orbit subtraction in progress
BPMLWIP
BPM
BPM
Mover Mover
e-
![Page 6: Extraction Line Laser-wire 24 th January 2013 A.Aryshev, G.A.Blair, S.T.Boogert, L.Corner, L. Nevay, P.Karataev, N.Terunuma, J.Urakawa, R.Walczak.](https://reader033.fdocuments.us/reader033/viewer/2022051622/5697c0261a28abf838cd589e/html5/thumbnails/6.jpg)
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Signal to Noise
• Background low under normal ATF2 operation• Required squeeze in βat Laser-wire IP increases• Laser old and can be unstable -> lower energy
![Page 7: Extraction Line Laser-wire 24 th January 2013 A.Aryshev, G.A.Blair, S.T.Boogert, L.Corner, L. Nevay, P.Karataev, N.Terunuma, J.Urakawa, R.Walczak.](https://reader033.fdocuments.us/reader033/viewer/2022051622/5697c0261a28abf838cd589e/html5/thumbnails/7.jpg)
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Signal Correlations
• Background correlation varies from week to week• Hardware improvements for laser normalisation
![Page 8: Extraction Line Laser-wire 24 th January 2013 A.Aryshev, G.A.Blair, S.T.Boogert, L.Corner, L. Nevay, P.Karataev, N.Terunuma, J.Urakawa, R.Walczak.](https://reader033.fdocuments.us/reader033/viewer/2022051622/5697c0261a28abf838cd589e/html5/thumbnails/8.jpg)
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Variation in Background
![Page 9: Extraction Line Laser-wire 24 th January 2013 A.Aryshev, G.A.Blair, S.T.Boogert, L.Corner, L. Nevay, P.Karataev, N.Terunuma, J.Urakawa, R.Walczak.](https://reader033.fdocuments.us/reader033/viewer/2022051622/5697c0261a28abf838cd589e/html5/thumbnails/9.jpg)
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Laser Characterisation
• Characterise using scaled up focus• Scale this measurement to laser-wire IP• Two axis – astigmatic – project vertical sigma
![Page 10: Extraction Line Laser-wire 24 th January 2013 A.Aryshev, G.A.Blair, S.T.Boogert, L.Corner, L. Nevay, P.Karataev, N.Terunuma, J.Urakawa, R.Walczak.](https://reader033.fdocuments.us/reader033/viewer/2022051622/5697c0261a28abf838cd589e/html5/thumbnails/10.jpg)
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Orbit Jitter Subtraction
• Orbit jitter subtraction currently doesn’t improve• Method being revised• Correction is small compared to poor correlations
![Page 11: Extraction Line Laser-wire 24 th January 2013 A.Aryshev, G.A.Blair, S.T.Boogert, L.Corner, L. Nevay, P.Karataev, N.Terunuma, J.Urakawa, R.Walczak.](https://reader033.fdocuments.us/reader033/viewer/2022051622/5697c0261a28abf838cd589e/html5/thumbnails/11.jpg)
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Current Operations
• Recommissioning laser-wire since last year• Investigation of signal correlations• Investigation of orbit correction
• Improvements in signal characterisation• Increased precision
![Page 12: Extraction Line Laser-wire 24 th January 2013 A.Aryshev, G.A.Blair, S.T.Boogert, L.Corner, L. Nevay, P.Karataev, N.Terunuma, J.Urakawa, R.Walczak.](https://reader033.fdocuments.us/reader033/viewer/2022051622/5697c0261a28abf838cd589e/html5/thumbnails/12.jpg)
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Future Operations• Goal of 1 micron laser-wire scans a reality• Consistent data needed for publication
• Operations confirmed until March• Possible operations until Summer 2013
• Current incarnation will finish this summer• New laser source required for further operations• Resolution aspect of laser-wire study complete• High repetition rate and intra-train scanning
underway at DESY