Beamline Alignment Quick Reference - Revision history

Mvholt at 14:21, October 6, 2010

2010-10-06T14:21:57Z

← Older revision		Revision as of 14:21, October 6, 2010
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	Scan BDA horizontal center with a scan width of ~0.6mm, 21pts.<br />		Scan BDA horizontal center with a scan width of ~0.6mm, 21pts.<br />
	Set BDA horizontal center to maximum intensity<br />		Set BDA horizontal center to maximum intensity<br />
	Return horizontal BDA width to 2mm for full beam, 0.025mm for coherent scanning probe beam<br />		Return horizontal BDA width to 2mm for full beam, 0.025mm for horizontally coherent scanning probe beam<br />
	NOTES:<br />		NOTES:<br />
	i)This scan is optional if BDA is not being used or if the results of the horizontal alignment (steps 2 and 3 above) are similar to previous. <br />		i)This scan is optional if BDA is not being used or if the results of the horizontal alignment (steps 2 and 3 above) are similar to previous. <br />
	[[Category:XMG]][[Category:Controls]][[Category:Beamline]]		[[Category:XMG]][[Category:Controls]][[Category:Beamline]]

Mvholt at 14:20, October 6, 2010

2010-10-06T14:20:11Z

← Older revision		Revision as of 14:20, October 6, 2010
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	'''1) Select x-ray energy:'''<br />		'''1) Select x-ray energy:'''<br />
	Calculate scattering angle of Si 111 for desired energy with Bragg law calculator (or approximate Theta ~ asin(1.977084/E keV) ) <br />		Calculate scattering angle of Si 111 for desired energy with Bragg law calculator (or approximate Theta ~ asin(1.977084/E keV) ) <br />
			Bring up alignment motor tab via DCM flag on main beamline screen - DCM soft motors <br />
	Drive DCM Theta to the correct Bragg angle for the desired energy<br />		Drive DCM Theta to the correct Bragg angle for the desired energy<br />
	Drive both undulators to the desired energy plus an approximate offset of +0.1keV<br />		Drive both undulators to the desired energy plus an approximate offset of +0.1keV<br />

Mvholt at 14:17, October 6, 2010

2010-10-06T14:17:52Z

← Older revision		Revision as of 14:17, October 6, 2010
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	\| BDA \|\| 2 \|\|\| -		\| BDA \|\| 2 \|\|\| -
	\|}		\|}
			Find DCM piezo motor via IOCs flag - DCM - motors - motor 1 (or manually enter in scan window 26idbDCM:m1.VAL)<br />
	Scan control voltage for DCM piezo tweak with a scan width of ~3V, 21pts.<br />		Scan control voltage for DCM piezo tweak with a scan width of ~3V, 21pts.<br />
	Set piezo to maximum intensity.<br />		Set piezo to maximum intensity.<br />

Mvholt at 14:15, October 6, 2010

2010-10-06T14:15:59Z

← Older revision		Revision as of 14:15, October 6, 2010
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	Set piezo to maximum intensity.<br />		Set piezo to maximum intensity.<br />
	NOTES:<br />		NOTES:<br />
	i) if voltage is trending out of range (1V<V<9V), set tweak to 4.5V and scan theta2 motion +/- 0.1mrad<br />		i) DCM feedback should be OFF (DCM flag on main beamline screen)<br />
			ii) if voltage is trending out of range (1V<V<9V), set tweak to 4.5V and scan theta2 motion +/- 0.1mrad<br />

Mvholt at 14:12, October 6, 2010

2010-10-06T14:12:19Z

@@ Line 77: / Line 77: @@
 NOTES:<br />
 i) Settling time of at least 1 second is necessary for this scan (possibly more)<br />
 [[Category:XMG]][[Category:Controls]][[Category:Beamline]]

Mvholt at 21:03, October 5, 2010

2010-10-05T21:03:36Z

← Older revision		Revision as of 21:03, October 5, 2010
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	'''5) Scan Undulators:'''		'''5) Scan Undulators:'''<br />
	Scan upstream and downstream undulators with a scan width of 0.5 keV (1 sec settling time), drive to maximum intensity<br />		Scan upstream and downstream undulators with a scan width of 0.5 keV (1 sec settling time), drive to maximum intensity<br />
	NOTES:<br />		NOTES:<br />
	i) Settling time of at least 1 second is necessary for this scan (possibly more)<br />		i) Settling time of at least 1 second is necessary for this scan (possibly more)<br />
	[[Category:XMG]][[Category:Controls]][[Category:Beamline]]		[[Category:XMG]][[Category:Controls]][[Category:Beamline]]

Mvholt at 21:02, October 5, 2010

2010-10-05T21:02:05Z

← Older revision		Revision as of 21:02, October 5, 2010
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	Calculate scattering angle of Si 111 for desired energy with Bragg law calculator (or approximate Theta ~ asin(1.977084/E keV) ) <br />		Calculate scattering angle of Si 111 for desired energy with Bragg law calculator (or approximate Theta ~ asin(1.977084/E keV) ) <br />
	Drive DCM Theta to the correct Bragg angle for the desired energy<br />		Drive DCM Theta to the correct Bragg angle for the desired energy<br />
	Drive undulators ~~approximately~~ to ~~this~~ energy ~~as well~~ <br />		Drive both undulators to the desired energy plus an approximate offset of +0.1keV<br />

	NOTES:<br />		NOTES:<br />
	i) If DCM theta looks low for the current energy (~2-4 deg) you may need to re-set user offset (current calibrated theta offset = dial + 8.646deg) <br />		i) If DCM theta looks low for the current energy (~2-4 deg) you may need to re-set user offset (current calibrated theta offset = dial + 8.646deg) <br />
	ii) Approximate undulator offsets are ~ desired energy +0.1 keV <br />		ii) Approximate undulator offsets are ~ desired energy +0.1 keV at ~8keV, +0.2keV at 12 keV <br />


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	\| BDA \|\| 2 \|\|\| -		\| BDA \|\| 2 \|\|\| -
	\|}		\|}
	~~scan~~ mirror piezo +/~~- 1 V.~~ Set mirror piezo to the maximum.<br />		Scan mirror piezo with a scan width of ~2V, ~ 21 points. <br />
			Set mirror piezo to the maximum intensity.<br />
	NOTES:<br />		NOTES:<br />
	i) mirror piezo feedback should be OFF <br />		i) mirror piezo feedback should be OFF (MIR flag on main beamline screen)<br />
	ii) CCD shutter should be set to "manual open"<br />		ii) CCD azsol shutter should be set to "manual open" or removed from beam path<br />
	<br />		<br />

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	\| BDA \|\| 2 \|\|\| -		\| BDA \|\| 2 \|\|\| -
	\|}		\|}
	scan ~~roll +/-~~ 0.15 mrad. Set roll to maximum - correct for backlash.<br />		Scan DCM Chi2 (roll) with a scan width of ~0.2 mrad, 21 pts, (at least 1 sec of positioner settling time)<br />
			Set roll to maximum intensity - correct for backlash.<br />
	NOTES:<br />		NOTES:<br />
	i) Correct for backlash by driving to first scan point, then to maximum (e.g. after scan drive relative position -0.15, then drive absolute position to max)<br />		i) Correct for backlash by driving to first scan point, then to maximum (e.g. after scan drive relative position -0.1, then drive absolute position to max)<br />
	ii) Settling time of at least 1 second is necessary for this scan (this axis is UHV picomotor driven in PID)		ii) Settling time of at least 1 second is necessary for this scan (this axis is UHV picomotor driven in PID)

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	\| BDA \|\| 2 \|\|\| -		\| BDA \|\| 2 \|\|\| -
	\|}		\|}
	~~scan~~ control voltage for DCM piezo tweak +/~~- 1.5 V.~~ Set piezo to ~~max~~.<br />		Scan control voltage for DCM piezo tweak with a scan width of ~3V, 21pts.<br />
			Set piezo to maximum intensity.<br />
	NOTES:<br />		NOTES:<br />
	i) if voltage is trending out of range (1V<V<9V), set tweak to 4.5V and scan theta2 motion +/- 0.1mrad<br />		i) if voltage is trending out of range (1V<V<9V), set tweak to 4.5V and scan theta2 motion +/- 0.1mrad<br />
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	'''5) Scan Undulators:'''		'''5) Scan Undulators:'''
	Scan upstream and downstream undulators ~~+/-~~ 0.25 keV, drive to ~~max~~<br />		Scan upstream and downstream undulators with a scan width of 0.5 keV (1 sec settling time), drive to maximum intensity<br />
	NOTES:<br />		NOTES:<br />
	i) Settling time of at least 1 second is necessary for this scan (possibly more)<br />		i) Settling time of at least 1 second is necessary for this scan (possibly more)<br />
	[[Category:XMG]][[Category:Controls]][[Category:Beamline]]		[[Category:XMG]][[Category:Controls]][[Category:Beamline]]

Mvholt at 20:25, October 5, 2010

2010-10-05T20:25:04Z

← Older revision		Revision as of 20:25, October 5, 2010
Line 3:		Line 3:
	'''1) Select x-ray energy:'''<br />		'''1) Select x-ray energy:'''<br />
	Calculate scattering angle of Si 111 for desired energy with Bragg law calculator (or approximate Theta ~ asin(1.977084/E keV) ) <br />		Calculate scattering angle of Si 111 for desired energy with Bragg law calculator (or approximate Theta ~ asin(1.977084/E keV) ) <br />
	Drive DCM Theta to the correct Bragg angle for the desired energy		Drive DCM Theta to the correct Bragg angle for the desired energy<br />
	Drive undulators approximately to this energy as well <br />		Drive undulators approximately to this energy as well <br />

Mvholt at 20:24, October 5, 2010

2010-10-05T20:24:43Z

← Older revision		Revision as of 20:24, October 5, 2010
Line 3:		Line 3:
	'''1) Select x-ray energy:'''<br />		'''1) Select x-ray energy:'''<br />
	Calculate scattering angle of Si 111 for desired energy with Bragg law calculator (or approximate Theta ~ asin(1.977084/E keV) ) <br />		Calculate scattering angle of Si 111 for desired energy with Bragg law calculator (or approximate Theta ~ asin(1.977084/E keV) ) <br />
	Drive DCM Theta to the correct Bragg angle for the desired energy~~, drive~~ undulators approximately to this energy as well <br />		Drive DCM Theta to the correct Bragg angle for the desired energy
			Drive undulators approximately to this energy as well <br />

	NOTES:<br />		NOTES:<br />

Mvholt at 14:27, September 8, 2010

2010-09-08T14:27:20Z

← Older revision		Revision as of 14:27, September 8, 2010
Line 2:		Line 2:

	'''1) Select x-ray energy:'''<br />		'''1) Select x-ray energy:'''<br />
	Calculate scattering angle of Si 111 for desired energy with Bragg law calculator <br />		Calculate scattering angle of Si 111 for desired energy with Bragg law calculator (or approximate Theta ~ asin(1.977084/E keV) ) <br />
	Drive DCM Theta to the correct Bragg angle for the desired energy, drive undulators approximately to this energy as well <br />		Drive DCM Theta to the correct Bragg angle for the desired energy, drive undulators approximately to this energy as well <br />

	NOTES:<br />		NOTES:<br />
	i) If DCM theta looks low for the current energy (~2-4 deg) you may need to re-set user offset (current calibrated theta offset = dial + 8.646deg) <br />		i) If DCM theta looks low for the current energy (~2-4 deg) you may need to re-set user offset (current calibrated theta offset = dial + 8.646deg) <br />
	ii~~) Approximate Si 111 Bragg Theta = asin(1.977084/E keV)<br />~~		ii) Approximate undulator offsets are ~ desired energy +0.1 keV <br />
	~~iii~~) Approximate undulator offsets are ~ desired energy +0.1 keV <br />