NEW CCD

Property	STA1 device	T2KA
Size (pixels)	2600 x 4000	2048 x 2048
Pixel size	12 microns	24 microns
Full Well	87500 electrons	??
Read Noise (overscan)
- High Gain	3.2 el	6 el
- Medium Gain	3.7 el
- Low Gain	4.3 el
Readout Times	Binned 1x1; 2x2
- High Gain	227 sec; 67 sec
- Medium Gain	140 sec; 45 sec
- Low Gain	97 sec; 34 sec
Conversion Gain
- High Gain	0.21 (el/DN)
- Medium Gain	0.44 (el/DN)
- Low Gain	0.87 (el/DN)
Dynamic Range (saturation/RN) (1x1)	17,000 (Gain=.22 e/DN)	??
Linearity	1% to 63,000 el	1% to 190,000 el 0.1% to 180,000 el
Usable Data Range	DN upper limit
	1% linearity; Full well
- High Gain	262,143 DN ; 262,143 DN
- Medium Gain	143,800 DN ; 200,000 DN
- Low Gain	72,000 DN ; 100,000 DN
Dark Current
for binning:	above background level at 152 K
- 2x1	1.40 el/2x1binned pix/half-hour
- 2x2	2.64 el/2x2binned pix/half-hour	4-5 el/pix/hour
- 4x2	4.88 el/2x1binned pix/half-hour

Comments:

• Users should note the numbers in the"usable" range - at medium or low gains it is possible to saturate the output amplifier before hitting the maximum values allowed by the Analog-to-Digital Converter. When the amplifier saturates the data become terribly non-linear.
• Although the dark current is very low, there are some "hot pixels" (for which dark current is much larger than their immediate neighbors) which can be corrected during the processing stage. We will be developing master dark frames based on large number of frames which can be scaled to reduced the affect of the hot pixels on the science data.
• N.B. Be sure to leave the system running with the MOP gui visible at all times. When the one exits the MOP the clocks and control electronics are turned off. When the system is restarted after being powered down for any length of time, a residual charge remains on the CCD that looks like a weak signal. It takes several minutes in the powered on but idle state to clear this charge.

Measured Quantum Efficiency for the new Bench CCD compared to the existing T2KA device and the dead T2KC CCD.

T2KA QE Values (approx)

T2KC QE Values (approx)

STA1 QE Values (approx)

Click here for a MOP quickstart guide.

and here for the Bench MOP Users Guide (V2.1) (CCD GUI manual - pdf file)

BSC (f=285mm)
					T2KA		STA1
					24 micron pixels		12 micron pixels
Grating	l/mm	Blaze angle	Order	Linear disp	Dispersion	Coverage	Dispersion	Coverage
				Angs/mm	Ang/pix	Angs	Ang/pix	Angs
316@7	316	7	1	110.21	2.645	5417.0	1.323	5290.1
	316	7	2	55.10	1.323	2708.5	0.661	2645.0
400@4.2	400	4.2	1	87.48	2.100	4300.0	1.050	4199.2
600@10.1	600	10.1	1	57.57	1.382	2829.8	0.691	2763.5
600@13.9	600	13.9	1	56.77	1.362	2790.2	0.681	2724.8
	600	13.9	2	28.38	0.681	1395.1	0.341	1362.4
860@30.9	860	30.9	1	35.01	0.840	1720.8	0.420	1680.5
	860	30.9	2	17.50	0.420	860.4	0.210	840.2
	860	30.9	3	11.67	0.280	573.6	0.140	560.2
1200@28.7	1200	28.7	1	25.65	0.616	1260.7	0.308	1231.1
	1200	28.7	2	12.82	0.308	630.3	0.154	615.6
316@63.4	316	63.4	9	5.53	0.133	271.6	0.066	265.2
	316	63.4	10	4.97	0.119	244.4	0.060	238.7
	316	63.4	11	4.52	0.108	222.2	0.054	217.0
	316	63.4	12	4.14	0.099	203.7	0.050	198.9
	316	63.4	13	3.83	0.092	188.0	0.046	183.6
	316	63.4	14	3.55	0.085	174.6	0.043	170.5
VPH740	740	19.0	1	44.8	1.076	2203	0.538	2152
VPH740	740	19.0	2	22.4	0.538	1101.8	0.269	1076
VPH3300	3300	57.6	1	5.69	0.137	279.7	0.068	273.1
Simmons Camera (f=381mm)
316@7	316	7	1	82.44	1.979	4052.1	0.989	3957.1
	316	7	2	41.22	0.989	2026.1	0.495	1978.6
400@4.2	400	4.2	1	65.44	1.571	3216.5	0.785	3141.1
600@10.1	600	10.1	1	43.07	1.034	2116.8	0.517	2067.2
600@13.9	600	13.9	1	42.46	1.019	2087.2	0.510	2038.3
	600	13.9	2	21.23	0.510	1043.6	0.255	1019.1
860@30.9	860	30.9	1	26.19	0.629	1287.2	0.314	1257.0
	860	30.9	2	13.09	0.314	643.6	0.157	628.5
	860	30.9	3	8.73	0.210	429.1	0.105	419.0
1200@28.7	1200	28.7	1	19.19	0.460	943.0	0.230	920.9
	1200	28.7	2	9.59	0.230	471.5	0.115	460.5
316@63.4	316	63.4	9	4.13	0.099	203.1	0.050	198.4
	316	63.4	10	3.72	0.089	182.8	0.045	178.5
	316	63.4	11	3.38	0.081	166.2	0.041	162.3
	316	63.4	12	3.10	0.074	152.4	0.037	148.8
	316	63.4	13	2.86	0.069	140.6	0.034	137.3
	316	63.4	14	2.66	0.064	130.6	0.032	127.5
VPH740	740	19.0	1	33.5	0.805	1648	0.402	1610
"	740	19.0	2	16.8	0.402	824	0.201	805
VPH3300	3300	57.6	1	4.26	0.102	209	0.051	204