Last modification: 12-May-2005

The marccd and marmosaic detectors

Related pages: mar345 | desktop beamline | marUSA Home Page

1. Introduction

marmosaic 225mm: click for 10-fold magnification (220 kB)

The marccd and marmosaic detectors are defining the standards in high-performance/high-throughput protein crystallography. They offer the lowest noise and superb data quality and have therefore become the first choice for protein crystallography synchrotron beamlines around the world.

The mosaic detectors come in 3 sizes with 225 mm, 300 mm or 325 mm square surface. The single-chip CCD detector has a round surface of 165 mm diameter. The choice of detector is mainly determined by the budget. Due to dimensions and weight only the marccd 165 and the marmosaic 225 can be mounted on a marresearch desktop beamline ^® .

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2. Specifications

Property marccd 165 marmosaic 225 marmosaic 300 marmosaic 325

X-ray sensitive surface 165 mm diameter 225 mm x 225 mm 300 mm x 300 mm 325 mm x 325 mm

Number of CCD-chips 1 9 16 16

Pixels per chip 4096 x 4096 2048 x 2048 2048 x 2048 2048 x 2048

No. of on-chip read-out channels 4 18 32 32

Fiber-optic taper demagnification ratio 2.7 : 1 2.7 : 1 2.9 : 1 2.9 : 1

Software selectable image and pixel sizes 2048 x 2048 (80 μm)
1024 x 1024 (160 μm)
512 x 512 (320 μm) 3072 x 3072 (73 μm)
1536 x 1536 (146 μm) 4096 x 4096 (73 μm)
2048 x 2048 (146 μm) 4096 x 4096 (73 μm)
2048 x 2048 (158 μm)

Detective quantum efficiency (DQE) at 8-12 keV up to 0.8 up to 0.8 up to 0.8 up to 0.8

Point spread function FWHM ∼ 100 μm
FW 1% ∼ 300 μm FWHM ∼ 100 μm
FW 1% ∼ 300 μm FWHM ∼ 100 μm
FW 1% ∼ 300 μm FWHM ∼ 100 μm
FW 1% ∼ 300 μm

Gain (electrons per 12 keV X-ray photon) 6 e^- 6 e^- 6 e^- 5 e^-

Read-out noise in standard readout mode < 13 e^-/pixel < 10 e^-/pixel < 10 e^-/pixel < 10 e^-/pixel

Dark current at -70°C ≤ 0.01 e^-/pixel/sec ≤ 0.01 e^-/pixel/sec ≤ 0.01 e^-/pixel/sec ≤ 0.01 e^-/pixel/sec

Full well capacity for 12 keV photons 65000 60000 60000 72000

Dynamic range 16 bits 16 bits 16 bits 16 bits

Physical dimensions of detector head

Height x width x depth 22 x 22 x 34 cm 46 x 32 x 40 cm 58 x 42 x 43 cm 58 x 42 x 43 cm

Weight ∼ 20 kg ∼ 52 kg ∼ 115 kg ∼ 125 kg

Physical dimensions of electronics cabinet

Height x width x depth 72 x 43 x 64 cm 175 x 64 x 64 cm 150 x 64 x 64 cm (x2) 150 x 64 x 64 cm (x2)

Weight ∼ 60 kg ∼ 215 kg ∼ 215 kg (x2) ∼ 215 kg (x2)

General Features

Property	marccd 165	marmosaic 225	marmosaic 300	marmosaic 325
X-ray sensitive surface	165 mm diameter	225 mm x 225 mm	300 mm x 300 mm	325 mm x 325 mm
Number of CCD-chips	1	9	16	16
Pixels per chip	4096 x 4096	2048 x 2048	2048 x 2048	2048 x 2048
No. of on-chip read-out channels	4	18	32	32
Fiber-optic taper demagnification ratio	2.7 : 1	2.7 : 1	2.9 : 1	2.9 : 1
Software selectable image and pixel sizes	2048 x 2048 (80 μm) 1024 x 1024 (160 μm) 512 x 512 (320 μm)	3072 x 3072 (73 μm) 1536 x 1536 (146 μm)	4096 x 4096 (73 μm) 2048 x 2048 (146 μm)	4096 x 4096 (73 μm) 2048 x 2048 (158 μm)
Detective quantum efficiency (DQE) at 8-12 keV	up to 0.8	up to 0.8	up to 0.8	up to 0.8
Point spread function	FWHM ∼ 100 μm FW 1% ∼ 300 μm	FWHM ∼ 100 μm FW 1% ∼ 300 μm	FWHM ∼ 100 μm FW 1% ∼ 300 μm	FWHM ∼ 100 μm FW 1% ∼ 300 μm
Gain (electrons per 12 keV X-ray photon)	6 e^-	6 e^-	6 e^-	5 e^-
Read-out noise in standard readout mode	< 13 e^-/pixel	< 10 e^-/pixel	< 10 e^-/pixel	< 10 e^-/pixel
Dark current at -70°C	≤ 0.01 e^-/pixel/sec	≤ 0.01 e^-/pixel/sec	≤ 0.01 e^-/pixel/sec	≤ 0.01 e^-/pixel/sec
Full well capacity for 12 keV photons	65000	60000	60000	72000
Dynamic range	16 bits	16 bits	16 bits	16 bits
Physical dimensions of detector head
Height x width x depth	22 x 22 x 34 cm	46 x 32 x 40 cm	58 x 42 x 43 cm	58 x 42 x 43 cm
Weight	∼ 20 kg	∼ 52 kg	∼ 115 kg	∼ 125 kg
Physical dimensions of electronics cabinet
Height x width x depth	72 x 43 x 64 cm	175 x 64 x 64 cm	150 x 64 x 64 cm (x2)	150 x 64 x 64 cm (x2)
Weight	∼ 60 kg	∼ 215 kg	∼ 215 kg (x2)	∼ 215 kg (x2)