Micro-Channel Plates - Revision history

Ben Reed at 21:02, 20 May 2026

2026-05-20T21:02:42Z

← Older revision		Revision as of 14:02, 20 May 2026
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	* [[File:VV52A.jpg\|thumb\|VV52A under final slit box.]]Close DRA:BV52.		* [[File:VV52A.jpg\|thumb\|VV52A under final slit box.]]Close DRA:BV52.
	* Turn off DRA:IG52 ion guage.		* Turn off DRA:IG52 ion guage.
	* Turn off DRA:TP52 turbo pump and allow the pump to spin down. Otherwise, the pump could be damaged severely. To tell that DRA:TP52 has spun down, ~~DRA:CG52 and DRA:CG52C will equilibrate (+/- some offset) and~~ you ~~will be able to physically~~ feel that ~~the turbo~~ is ~~not~~ spinning. This takes approx. 1 hr, but it is important to do so to avoid severely damaging the turbo.		* Turn off DRA:TP52 turbo pump and allow the pump to spin down. Otherwise, the pump could be damaged severely. To tell that DRA:TP52 has spun down, check that you can no longer feel the pump vibrating and on the controller that it is no longer spinning. This takes approx. 1 hr, but it is important to do so to avoid severely damaging the turbo.
	* Ensure all the DRAGON vent valves are closed. DRA:VNT1 located on the "Differential Pumping" EPICS page should be checked. Other vent vales are labelled VV## where ## is the number.		* Ensure all the DRAGON vent valves are closed. DRA:VNT1 located on the "Differential Pumping" EPICS page should be checked. Other vent vales are labelled VV## where ## is the number.
	* Ensure the manually adjustable vent valve (labelled "VV52A", see Fig.2) physically located near VV52 is fully closed before proceeding.		* Ensure the manually adjustable vent valve (labelled "VV52A", see Fig.2) physically located near VV52 is fully closed before proceeding.

Ben Reed: Updated information about turbo spinning down

2026-05-19T15:06:43Z

Updated information about turbo spinning down

← Older revision		Revision as of 08:06, 19 May 2026
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	* [[File:VV52A.jpg\|thumb\|VV52A under final slit box.]]Close DRA:BV52.		* [[File:VV52A.jpg\|thumb\|VV52A under final slit box.]]Close DRA:BV52.
	* Turn off DRA:IG52 ion guage.		* Turn off DRA:IG52 ion guage.
	* Turn off DRA:TP52 turbo pump and allow the pump to spin down~~, wait at least 30 minutes before venting with Nitrogen~~. Otherwise, the pump could be damaged severely.		* Turn off DRA:TP52 turbo pump and allow the pump to spin down. Otherwise, the pump could be damaged severely. To tell that DRA:TP52 has spun down, DRA:CG52 and DRA:CG52C will equilibrate (+/- some offset) and you will be able to physically feel that the turbo is not spinning. This takes approx. 1 hr, but it is important to do so to avoid severely damaging the turbo.
	* Ensure all the DRAGON vent valves are closed. DRA:VNT1 located on the "Differential Pumping" EPICS page should be checked. Other vent vales are labelled VV## where ## is the number.		* Ensure all the DRAGON vent valves are closed. DRA:VNT1 located on the "Differential Pumping" EPICS page should be checked. Other vent vales are labelled VV## where ## is the number.
	* Ensure the manually adjustable vent valve (labelled "VV52A", see Fig.2) physically located near VV52 is fully closed before proceeding.		* Ensure the manually adjustable vent valve (labelled "VV52A", see Fig.2) physically located near VV52 is fully closed before proceeding.

Ben Reed at 17:42, 15 May 2026

2026-05-15T17:42:28Z

Ben Reed at 18:35, 14 May 2026

2026-05-14T18:35:28Z

← Older revision		Revision as of 11:35, 14 May 2026
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	* Go to EPICS "ED2 to SSD" or "ED2 to IC" Page - depending on which detecor is installed.		* Go to EPICS "ED2 to SSD" or "ED2 to IC" Page - depending on which detecor is installed.
	* Close DRA:BV52.		* [[File:VV52A.jpg\|thumb\|VV52A under final slit box.]]Close DRA:BV52.
	* Turn off DRA:IG52 ion guage.		* Turn off DRA:IG52 ion guage.
	* Turn off DRA:TP52 turbo pump and allow the pump to spin down, wait at least 30 minutes before venting with Nitrogen. Otherwise, the pump could be damaged severely.		* Turn off DRA:TP52 turbo pump and allow the pump to spin down, wait at least 30 minutes before venting with Nitrogen. Otherwise, the pump could be damaged severely.
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	* Open the nitrogen gas cylinder located next to MD2, and activate the "dead man" 30 min time out switch. Remember to reset the switch as the venting procedure will take at least an hour.		* Open the nitrogen gas cylinder located next to MD2, and activate the "dead man" 30 min time out switch. Remember to reset the switch as the venting procedure will take at least an hour.
	* ~~[[File:VV52A.jpg\|thumb\|VV52A under final slit box.]]~~Open DRA:VV52.		* Open DRA:VV52.
	* Monitor pressure rise with DRA:CG52C and DRA:CG52 (ideally monitor the rate on a laptop while adjusting the manual valve VV52a), slowly open VV52a until the pressure in the final slit box starts to rise.		* Monitor pressure rise with DRA:CG52C and DRA:CG52 (ideally monitor the rate on a laptop while adjusting the manual valve VV52a), slowly open VV52a until the pressure in the final slit box starts to rise.
	* Close DRA:VV52 when DRA:CG52C and DRA:CG52 read atmosphere (760 Torr) or have saturated. The latter can happen at values below 760 Torr, when the gauge is slightly out of calibration		* Close DRA:VV52 when DRA:CG52C and DRA:CG52 read atmosphere (760 Torr) or have saturated. The latter can happen at values below 760 Torr, when the gauge is slightly out of calibration
	* Close the Nitrogen gas cylinder.		* Close the Nitrogen gas cylinder.

Ben Reed: Added venting procedure

2026-05-14T18:34:28Z

Added venting procedure

← Older revision		Revision as of 11:34, 14 May 2026
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	* Turn on turbo pump DRA:TP52.		* Turn on turbo pump DRA:TP52.
	* When pump starts up turn on DRA:IG52.		* When pump starts up turn on DRA:IG52.

			== '''Final Slit Box venting procedure with a thin foil''' ==

			* Go to EPICS "ED2 to SSD" or "ED2 to IC" Page - depending on which detecor is installed.
			* Close DRA:BV52.
			* Turn off DRA:IG52 ion guage.
			* Turn off DRA:TP52 turbo pump and allow the pump to spin down, wait at least 30 minutes before venting with Nitrogen. Otherwise, the pump could be damaged severely.
			* Ensure all the DRAGON vent valves are closed. DRA:VNT1 located on the "Differential Pumping" EPICS page should be checked. Other vent vales are labelled VV## where ## is the number.
			* Ensure the manually adjustable vent valve (labelled "VV52A", see Fig.2) physically located near VV52 is only slightly open.

			* Open the nitrogen gas cylinder located next to MD2, and activate the "dead man" 30 min time out switch. Remember to reset the switch as the venting procedure will take at least an hour.
			* [[File:VV52A.jpg\|thumb\|VV52A under final slit box.]]Open DRA:VV52.
			* Monitor pressure rise with DRA:CG52C and DRA:CG52 (ideally monitor the rate on a laptop while adjusting the manual valve VV52a), slowly open VV52a until the pressure in the final slit box starts to rise.
			* Close DRA:VV52 when DRA:CG52C and DRA:CG52 read atmosphere (760 Torr) or have saturated. The latter can happen at values below 760 Torr, when the gauge is slightly out of calibration
			* Close the Nitrogen gas cylinder.

Ben Reed at 18:30, 14 May 2026

2026-05-14T18:30:26Z

← Older revision		Revision as of 11:30, 14 May 2026
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	* Open EPICS "ED2 to SSD" or "ED2 to IC" Page - depending on which detecor is installed.		* Open EPICS "ED2 to SSD" or "ED2 to IC" Page - depending on which detecor is installed.
	* Turn the needle (manual) valve DRAMV74 (see Fig.1) located under the final slit box (West side) to max. 4.7[[File:DRAMV74.jpg~~\|left~~\|thumb\|Manual valve DRAMV74 under final slit box.]]		* Turn the needle (manual) valve DRAMV74 (see Fig.1) located under the final slit box (West side) to max. 4.7[[File:DRAMV74.jpg\|thumb\|Manual valve DRAMV74 under final slit box.]]
	* Ensure VV52 is closed.		* Ensure VV52 is closed.
	* Ensure, the MCP foils have been moved out of the beamline.		* Ensure, the MCP foils have been moved out of the beamline.

Ben Reed at 18:30, 14 May 2026

2026-05-14T18:30:10Z

← Older revision		Revision as of 11:30, 14 May 2026
Line 2:		Line 2:

	* Open EPICS "ED2 to SSD" or "ED2 to IC" Page - depending on which detecor is installed.		* Open EPICS "ED2 to SSD" or "ED2 to IC" Page - depending on which detecor is installed.
	* Turn the needle (manual) valve DRAMV74 (see Fig.1) located under the final slit box (West side) to max. 4.7		* Turn the needle (manual) valve DRAMV74 (see Fig.1) located under the final slit box (West side) to max. 4.7[[File:DRAMV74.jpg\|left\|thumb\|Manual valve DRAMV74 under final slit box.]]
	* Ensure VV52 is closed.		* Ensure VV52 is closed.
	* Ensure, the MCP foils have been moved out of the beamline.		* Ensure, the MCP foils have been moved out of the beamline.

Ben Reed: Copied pump down procedure from DRAON website

2026-05-14T18:23:13Z

Copied pump down procedure from DRAON website

New page

== '''Final Slit Box pump down procedure with a thin foil''' ==

* Open EPICS "ED2 to SSD" or "ED2 to IC" Page - depending on which detecor is installed.
* Turn the needle (manual) valve DRAMV74 (see Fig.1) located under the final slit box (West side) to max. 4.7
* Ensure VV52 is closed.
* Ensure, the MCP foils have been moved out of the beamline.
* Turn on DRA:RP21.
* Wait until pressure at DRA:CG21B is below 50 mTorr
* Open DRA:RV54.
* Watch Vacuum Gauges DRA:CG52 and DRA:CG52C to see that pressure drops by less than 1 Torr/second. Ideally watch the rate on a laptop, while adjusting the needle valve if necessary. To be extra careful, one can open RV54 with the needle valve closed, and slowly start opening it while watching the rate. This avoids fast pressure drops that could potentially destroy the fragile foils. You may have to further adjust the valve during the pump down.
* When Pressure drops to about 2 Torr on DRA:CG52, close DRA:RV54 and open DRA:RV52.
* Turn on DRA:BP31.
* Open DRA:PV31.
* Close DRA:RV52.
* Open DRA:BV52.
* Turn on turbo pump DRA:TP52.
* When pump starts up turn on DRA:IG52.

← Older revision		Revision as of 10:42, 15 May 2026
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	== '''Final Slit Box pump down procedure with a thin foil''' ==		== '''Final Slit Box pump down procedure with a thin foil''' ==

	* Open EPICS "ED2 to SSD" or "ED2 to IC" Page - depending on which ~~detecor~~ is installed.		* Open EPICS "ED2 to SSD" or "ED2 to IC" Page - depending on which detector is installed.
	* Turn the needle (manual) valve DRAMV74 (see Fig.1) located under the final slit box (West side) ~~to max~~. ~~4.7~~[[File:DRAMV74.jpg\|thumb\|Manual valve DRAMV74 under final slit box.]]		* Turn the needle (manual) valve DRAMV74 (see Fig.1) located under the final slit box (West side) fully clockwise.[[File:DRAMV74.jpg\|thumb\|Manual valve DRAMV74 under final slit box.]]
	* Ensure VV52 is closed.		* Ensure VV52 is closed.
	* Ensure, the MCP foils have been moved out of the beamline.		* Ensure, the MCP foils have been moved out of the beamline.
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	* Turn off DRA:TP52 turbo pump and allow the pump to spin down, wait at least 30 minutes before venting with Nitrogen. Otherwise, the pump could be damaged severely.		* Turn off DRA:TP52 turbo pump and allow the pump to spin down, wait at least 30 minutes before venting with Nitrogen. Otherwise, the pump could be damaged severely.
	* Ensure all the DRAGON vent valves are closed. DRA:VNT1 located on the "Differential Pumping" EPICS page should be checked. Other vent vales are labelled VV## where ## is the number.		* Ensure all the DRAGON vent valves are closed. DRA:VNT1 located on the "Differential Pumping" EPICS page should be checked. Other vent vales are labelled VV## where ## is the number.
	* Ensure the manually adjustable vent valve (labelled "VV52A", see Fig.2) physically located near VV52 is ~~only slightly open~~.		* Ensure the manually adjustable vent valve (labelled "VV52A", see Fig.2) physically located near VV52 is fully closed before proceeding.

	* Open the nitrogen gas cylinder located next to MD2, and activate the "dead man" 30 min time out switch. Remember to reset the switch as the venting procedure will take at least an hour.		* Open the nitrogen gas cylinder located next to MD2, and activate the "dead man" 30 min time out switch. Remember to reset the switch as the venting procedure will take at least an hour.
	* Open DRA:VV52.		* Open DRA:VV52.
	* ~~Monitor~~ pressure ~~rise with~~ DRA:~~CG52C~~ and DRA:~~CG52 (ideally~~ monitor the rate on a laptop while adjusting the manual valve VV52a~~), slowly open VV52a until the pressure in the final slit box starts to rise.~~		* Slowly open VV52a until the pressure in the final slit box (DRA:CG52 and DRA:CG52C) starts to rise. The target rate of rise should be a few hundred mTorr/s. Ideally monitor the rate on a laptop while adjusting the manual valve VV52a
	* Close DRA:VV52 when DRA:CG52C and DRA:CG52 read atmosphere (760 Torr) or have saturated. The latter can happen at values below 760 Torr, when the gauge is slightly out of calibration		* Close DRA:VV52 when DRA:CG52C and DRA:CG52 read atmosphere (760 Torr) or have saturated. The latter can happen at values below 760 Torr, when the gauge is slightly out of calibration
	* Close the Nitrogen gas cylinder.		* Close the Nitrogen gas cylinder.