Description

Page : 1910

Sondrestrom Lidar Operation Log

Operator(s) : Christian, Have, Pedersen, Christian, Have, Pedersen, Christian Have Pedersen
Purpose : Daq. on 532nm and 607nm
Date(s) : 080220 - 080221
File(s) : L20080210_006 - L20080221_001
Comments : Got a lot of after pulsing on profile. From 2:30 to 4:30 profile has no after
pulsing, but chopper is up heigh. Been testing daystar mount as well with success.
Logfile : l0802210.log

Setup:0

Page : 1911
[Variables]
Rayleigh Power=530 mJ

[0]
front end Iris=not_installed
Rayleigh System=On
Rayleigh Field stop=0.5mm
Rayleigh path attenuation=0dB
Dye System=Off
Sodium Field stop=0.5mm
Etalon=Out
Daystar=Out
Polarizer=In
HalfWave Plates=Tracking
Rayleigh Filter=2:532(.5nm)
Rayleigh seeding=off

Logsheet:0

Page : 1912

Sondrestrom Lidar Operation Log

Log Sheet 1 of 3
Operators : Christian Have Pedersen
Date(s) : 080220 - 080220
File(s) : L20080210_006 - L20080220_000

Files	Time [UT]	Comments	Cnt	S	Ope
L20080210_006	21:00:12	Start of experiment		0	cp
L20080210_006	21:00:16	Testing daystar mount.		0	cp
L20080210_006	21:36:16	Seems that daystar mount is soid enough.		0	cp
L20080220_000	21:36:37	Now the HW plate are fliping and the daystar is in		0	cp
L20080220_000	21:37:19	Very dificult to eliminate the low alt return. Chopper is		0	cp
		very high now. Will try and lower it.
L20080220_000	21:47:08	Daystar is out now. Still flip HW plates.	284	0	cp
L20080220_000	21:48:07	Chopper pushed up really high now and still after pulsing is		0	cp
		present ?
L20080220_000	21:51:44	Cabinet door on now. That usually helps a little.		0	cp
L20080220_000	21:52:34	Started Raman channel		0	cp
L20080220_000	21:53:36	Hmmm. That looks free of after pulsing to me. Will try		0	cp
		and lower the chopper.
L20080220_000	21:56:36	That was too low	292	0	cp
		Whoops, forgot to remove cap on 607nm PMT.
L20080220_000	22:01:05	With respect to afterpulsing the Rayleigh looks ok now ?		0	cp
		Counts not high though. Will try and converge.
L20080220_000	22:06:55	Thats optimized. Low counts.	307	0	cp
L20080220_000	22:08:35	Letting it run undisturbed for a while.	311	0	cp
L20080220_000	22:12:31	Not sure if afterpulsing is gone.	315	0	cp
L20080220_000	22:15:31	Did some converging and now there is no afterpulsing.		0	cp
L20080220_000	22:16:09		233	0	cp

Logsheet:1

Page : 1913

Sondrestrom Lidar Operation Log

Log Sheet 2 of 3
Operators : Christian Have Pedersen
Date(s) : 080220 - 080221
File(s) : L20080220_000 - L20080220_001

Files	Time [UT]	Comments	Cnt	S	Ope
L20080220_000	22:17:40	Status: Getting afterpulsing if the chopper is pushed		0	cp
		further down. Counts are low. Energy outout of SP
		LASER are 530 mJ. Daystar mount is in place and is solid and
		adjustable. Will later try and identify exactly how the beam
		image is passed through the chopper. EG talked about a solution
		with a frenel lens ? Still fliping the HW plates.
L20080220_000	22:23:05		234	0	cp
L20080220_000	22:28:53		312	0	cp
L20080220_000	22:34:08		310	0	cp
L20080220_000	22:46:14		312	0	cp
L20080220_000	22:57:09		321	0	cp
L20080220_000	23:02:57		320	0	cp
L20080220_000	23:09:59		330	0	cp
L20080220_000	23:20:32		328	0	cp
L20080220_000	23:40:36		337	0	cp
L20080220_001	00:22:37		318	0	cp
L20080220_001	00:24:59	Adjusted convergence + pushed up chopper. (Chop.Sett:44)	277	0	cp
L20080220_001	00:26:58		321	0	cp
L20080220_001	00:33:44		317	0	cp
L20080220_001	01:31:23	Adjusted convergence + pushed up chopper.(Chop.Sett.46)	318	0	cp
L20080220_001	01:42:08	Going to work on chopper now. Will slide chopper, so that		0	cp
		focal point is nearer the rotation axis.

Logsheet:2

Page : 1914

Sondrestrom Lidar Operation Log

Log Sheet 3 of 3
Operators : Christian Have Pedersen
Date(s) : 080221 - 080221
File(s) : L20080220_001 - L20080221_001

Files	Time [UT]	Comments	Cnt	S	Ope
L20080220_001	02:13:00	Chopper adjustment not possible. Chopper mount not		0	cp
		slideable.Will have to wait until next exp.
L20080220_001	02:14:37	Weird profile now		0	cp
L20080220_001	02:18:48			0	cp
L20080220_001	02:27:16	Tweaking		0	cp
L20080221_000	02:49:53	Profile looks promissing		0	cp
L20080221_000	02:57:28	This looks good. Will go out and enjoy the lunar eclipse.		0	cp
L20080221_000	04:23:21	Going to tweak to see if profile can be improved	280	0	cp
		And then this exp. will be ended.
		Starting with chopper height
L20080221_000	04:25:20	Lowered chopper 1 notch (Chop. sett. 45)		0	cp
L20080221_000	04:29:24	Seing trace of after pulsing. Will try and converge.	321	0	cp
L20080221_000	04:39:28	Still AP (After Pulsing). Will remove cabint door and adjust iris		0	cp
L20080221_001	05:18:23	Still tweaking		0	cp
L20080221_001	05:36:05	Very hard to improve. Each the chopper heigth is lowered		0	cp
		the AP returns.
L20080221_001	05:38:19	Ack. And counts are low as well.		0	cp
L20080221_001	05:38:37	Status. Currently a profile with chopper at almost 30 km alt.		0	cp
		is possible. (Without AP)
L20080221_001	05:40:56	End of experiment	158	0	cp