Description

Page : 1477

Sondrestrom Lidar Operation Log

Operator(s) : E.Guðmundsson
Purpose : IR data collection togeather with the Rayleigh 532nm channel
Date(s) : 040615 - 040616
File(s) : L20040615_000 - L20040616_000
Comments :
Logfile : l0406150.log

Setup:0

Page : 1478
[Variables]
Rayleigh Power=

[0]
front end Iris=not_installed
Rayleigh System=On
Rayleigh Field stop=2.0mm
Rayleigh path attenuation=0dB
Dye System=On
Sodium Field stop=0.5mm
Etalon=Out
Daystar=8A_In
Polarizer=In
HalfWave Plates=In
Rayleigh Filter=2:532(.5nm)
Rayleigh seeding=off

Logsheet:0

Page : 1479

Sondrestrom Lidar Operation Log

Log Sheet 1 of 4
Operators : E.Guðmundsson
Date(s) : 040615 - 040615
File(s) : L20040615_000 - L20040615_000

Files	Time [UT]	Comments	S	Ope
L20040615_000	21:26:20	Start of experiment	0	EG
L20040615_000	21:31:30	HV just turned on for the IR channel, taking some dark	0	EG
		noise data as the radar is running.
L20040615_000	21:34:32	Going outside to open the shutter in front of theIR PMT	0	EG
L20040615_000	21:41:42	Just completed reconverging the IR, HV at 600V	0	EG
		Dark counts ok, increasing HV to 625V
L20040615_000	21:44:31	HV now at 625V, dark counts still low at 3	0	EG
L20040615_000	21:45:12	Increasingn to 650V	0	EG
L20040615_000	21:46:39	HV now at 650V. Reconverging for max altitude	0	EG
L20040615_000	21:52:03	Opening up the apperture a tad.	0	EG
L20040615_000	21:54:21	Doen opeing up the apperture, noise levels still ok,	0	EG
L20040615_000	21:54:37	opening up the apperture further	0	EG
L20040615_000	21:56:17	Done opeing more - background levels still ok at41 counts	0	EG
L20040615_000	21:58:45	Converged the IR again.	0	EG
L20040615_000	22:00:40	tryied converging again	0	EG
L20040615_000	22:03:43	Done converging, opening up the apperture further.	0	EG
L20040615_000	22:05:31	Done opening up the iris, looks like I may have over	0	EG
		shot the mark, will have reduce the apperture again
L20040615_000	22:06:27	Turned down the HV instead to 600V, we can tolerate	0	EG
		upto 190counts per bin at 600V
L20040615_000	22:27:20	Converged the 532nm rayleigh channel	0	EG
L20040615_000	22:47:18	532nm: Changed HWP tracking to manual	0	EG
L20040615_000	23:10:41	disconnected convrging scope (IR)	0	EG
L20040615_000	23:22:50	just tweeked the Z axis of the Rayleigh channel	0	EG

Logsheet:1

Page : 1480

Sondrestrom Lidar Operation Log

Log Sheet 2 of 4
Operators : E.Guðmundsson
Date(s) : 040615 - 040616
File(s) : L20040615_000 - L20040615_001

Files	Time [UT]	Comments	Cnt	Ope
L20040615_000	23:27:15	Reduced the apperture of the IR system due to clouds		EG
L20040615_000	23:28:50	Done reducing apperture, temporary - small patch of clouds		EG
L20040615_000	23:29:41	Turned HV off while waiting for clouds to pas by		EG
L20040615_000	23:30:28	done truning HV off		EG
L20040615_000	23:31:28	IR system now taking data with HV off		EG
L20040615_000	23:40:32	Turned HV on again (600V) on the IR , clouds passed by now.		EG
L20040615_000	23:45:33	Pushed teh chopper op a tad on the Rayleigh chanel		EG
L20040615_000	23:49:32	Opened the Rayleigh iris a tad		EG
L20040615_000	23:50:46	Clouds again in the path.		EG
L20040615_001	00:11:32	Changed Rayleigh daystar pod settign from 2.5 to 1.5		EG
L20040615_001	00:11:55	Counts 85		EG
L20040615_001	00:13:10	Counts 89	89	EG
L20040615_001	00:13:23	Counts 94	94	EG
L20040615_001	00:15:42	counts	76	EG
L20040615_001	00:16:24	counts	81	EG
L20040615_001	00:17:27	counts	70	EG
L20040615_001	00:18:50	counts	67	EG
L20040615_001	00:18:57	some clouds in the way.	67	EG
L20040615_001	00:21:50	counts	70	EG
L20040615_001	00:21:57	changing pod from 1.5 to 3.0	70	EG
L20040615_001	00:23:33	counts	65	EG
L20040615_001	00:24:29	counts	68	EG
L20040615_001	00:25:28	counts	71	EG
L20040615_001	00:26:44	counts	77	EG

Logsheet:2

Page : 1481

Sondrestrom Lidar Operation Log

Log Sheet 3 of 4
Operators : E.Guðmundsson
Date(s) : 040616 - 040616
File(s) : L20040615_001 - L20040615_001

Files	Time [UT]	Comments	Cnt	Ope
L20040615_001	00:27:33	counts	91	EG
L20040615_001	00:28:32	counts	93	EG
L20040615_001	00:29:29	counts	96	EG
L20040615_001	00:30:42	pushed rayleigh chopper up by 20us	98	EG
L20040615_001	00:31:44	counts	96	EG
L20040615_001	00:32:37	counts		EG
L20040615_001	00:32:43	changing pod setting from 3.0 to 3.5	95	EG
L20040615_001	00:33:43	Done changing	97	EG
L20040615_001	00:36:59	counts	102	EG
L20040615_001	00:37:35	counts	93	EG
L20040615_001	00:38:54	counts	98	EG
L20040615_001	00:40:05	counts	99	EG
L20040615_001	00:44:06	counts		EG
L20040615_001	00:44:38	Changing pod from 3.5 to 4.0	98	EG
L20040615_001	00:45:58	Done changing pod	94	EG
L20040615_001	00:46:39	counts	93	EG
L20040615_001	00:47:36	counts	93	EG
L20040615_001	00:48:39	counts	80	EG
L20040615_001	00:49:37	counts	85	EG
L20040615_001	00:50:51	counts	78	EG
L20040615_001	00:51:42	counts	69	EG
L20040615_001	00:52:54	counts	75	EG
L20040615_001	00:53:01	I may have passed the peek, turning pod back to 3.25	75	EG
L20040615_001	00:54:25	done changin pod	70	EG

Logsheet:3

Page : 1482

Sondrestrom Lidar Operation Log

Log Sheet 4 of 4
Operators : E.Guðmundsson
Date(s) : 040616 - 040616
File(s) : L20040615_001 - L20040616_000

Files	Time [UT]	Comments	Cnt	S	Ope
L20040615_001	00:54:42	Counts	65	0	EG
L20040615_001	00:55:46	counts	64	0	EG
L20040615_001	00:57:25	Opening the apperture on the IR system a bit, maintaining		0	EG
		600V Hv setting.
L20040615_001	01:00:40	counts	97	0	EG
L20040615_001	01:07:04	counts	105	0	EG
L20040615_001	01:46:05	Have been trying to get a better convergence on the IR		0	EG
L20040615_001	01:59:55	this is the best I can do....Raddar collector current is	99	0	EG
		modulating the DC level from the PMT! severe interferance!
L20040615_001	02:07:39	Background noise rising on IR channel, will have to stop down	100	0	EG
L20040615_001	02:09:33	looking better now.	105	0	EG
L20040615_001	02:15:12	Stopping furhter down		0	EG
L20040615_001	02:24:36	Noise problem gettign worse, closing shutter	99	0	EG
L20040615_001	02:26:02	Done closing shutter, the problem is not with the PMT.		0	EG
L20040616_000	02:49:14	taking down HV	107	0	EG
L20040616_000	03:00:55	Problem found - the SRS preamp is working as a rectifyer		0	EG
		on the 1.29GHz sTX ignal introducing a significant DC level
		on the output in the order of 100-200mV.
		Turning RF off eliminates the problem (tested during a slew)
		problem shows lot of varyability during slews.
L20040616_000	03:26:23	The telescope box will have to be screened. shutting down		0	EG
L20040616_000	03:27:25	End of experiment		0	EG