**Mar165 CCD Detector**

3/17/2005

A)  **Introduction**

> The Mar165 is a circular CCD detector with a diameter of 165mm. The
> detector uses a single front-illuminated CCD which is cooled to -70C
> with a cryogenic cooler. The detector acquires images to be stored on
> a Linux box, supplied by Mar. The frame rate is around .5Hz, or
> 2s/frame. The x-rays are converted to visible light with a GdOS
> phosphor attached to a fiber optic taper of a 2.7:1 demagnification.
> The detector is connected to a cabinet containing electronics and
> cryo-chiller with several hoses and cables. *None of the hoses or
> cables between the detector head and chiller cabinet should be
> disconnected.* The detector head is evacuated to about .5Torr. If this
> pressure rises above 1Torr, the system should be pumped out. *Do not
> cool the detector if pressure is above 1Torr, or ice may freeze on
> CCD*. The Mar detector system includes the following items: CCD Head,
> Cryo-chiller cabinet, heater, fiber optic cable, Linux computer,
> cables and gas lines.
>
> The detector is controlled by software, mar165, supplied by the vendor
> (Mar Research). The control computer runs under the RedHat
> implementation of Linux. The computer communicates to the Mar with an
> orange fiber optic cable that can be routed into a hutch, so the PC
> can be outside the hutch. The PC uses an Ethernet card to connect to
> the network (device eth0), using DHCP. Some users prefer to set a hard
> IP address. Some Mar computers have a second Ethernet card, eth1, that
> is unused.
>
> For more specifications on the detector please go to the Mar website:
>
> [http://www.marresearch.com](http://www.marresearch.com/)

B)  **Detector and Accessories**

> As there are two detectors, we include a list of items for each
> detector. When checking out the detector to a user, give them all of
> the items on this list, except the toolkit (unless they specifically
> ask for it).
>
> When giving out the detector, the camera head, and chiller are cabled
> together with many cables and hoses. DO NOT DISCONNECT ANY OF THESE
> HOSES OR CABLES. Disconnecting hoses could release flammable cooling
> gasses. Disconnecting cables could damage the detector, if done when
> power is on.
>
> It takes 2 people to move the Mar165- One to push the chiller, and
> another to hold the hoses etc. The computer must be gathered on a
> second trip.

The following tables are lists of all the equipment associated with the
two Mar 165 detectors in the detector pool.

Table 1. **Mar165 A**

  -------------------------- --------------------------------------------
  DP00022                    Mar 165 (CCD camera) unit A

  DP00023                    Computer (Mar ImagePlate software)(Linux)

  DP00024                    ViewSonic 20\" LCD Monitor

  DP00097                    Mounting stand for Mar165 (DP00022)

  DP00104                    Mouse for computer DP00023

  DP00119                    Spectral Inst. Inc. line heater for Mar165a

  DP00108                    Tools for Mar CCD, unit A

  DP00120                    Chiller for Mar165a

                             Orange fiberoptic cable.
  -------------------------- --------------------------------------------

Table 2. **Mar 165 B**

  -------------------------- --------------------------------------------
  DP00051                    Mar 165 (CCD camera B)

  DP00052                    Chiller for Mar165b

  DP00053                    Spectral Inst. Inc. lineheater box for
                             Mar165b

  DP00055                    Computer for Mar165b

  DP00056                    Monitor for Mar165b

  DP00101                    Aluminium Base Plate 1 of 2 for Mar165b

  DP00102                    Aluminium Base Plate 2 of 2 for Mar165b

  DP00054                    Tools for MAR CCD uni B

  DP00103                    Keyboard for Mar165b

                             Orange fiberoptic cable
  -------------------------- --------------------------------------------

A picture of the whole detector (what needs to be sent to the user) is
shown in Fig 0.

![](media/image1.jpeg){width="2.075in" height="2.7666666666666666in"}

Fig. 0 Mar detector system, including chiller cabinet, CCD head, heating
unit, hoses, cabels, orange fiber optic cable. Don't mess with cables or
hoses connected to CCD head. Computer not shown, as they all look the
same. When delivering detector, take the cart shown in the picture, and
the computer/monitor.

C)  **Physical Connection**

    1.  Secure the detector in the proper location in the experimental
        setup. The chiller cabinet and CCD go into the hutch. Fish the
        orange fiber optic cable out of the hutch to the lab floor,
        where the Linux box resides.

    2.  Connect orange cable to jack on Linux box, and jack on chiller
        cabinet. (Fig. 1, 2)

    3.  Turn on detector, by sticking your finger into hole in metal
        cabinet. Feel for rocker switch, and flip switch. Note that the
        rocker switch is on a power strip with 110V outlets. Look in the
        hole before blindly feeling around. (Fig. 3)

    4.  Turn on white line heater box. (Fig. 4)

    5.  Boot computer.

![](media/image2.jpeg){width="1.8819444444444444in"
height="1.5930555555555554in"}
![](media/image3.jpeg){width="1.7715277777777778in"
height="2.0305555555555554in"}
![](media/image4.jpeg){width="1.8819444444444444in"
height="1.5854166666666667in"}

Fig.1 Orange cable. Fig.2 Jack for orange cable. Fig3. In hole is power
switch.

> ![](media/image5.jpeg){width="1.7506944444444446in"
> height="1.7631944444444445in"}
>
> Fig 4. Turn on heater unit.

D)  **Software Start Up (and Shut Down)**

    1.  Log on to computer. Username: marccd, password:marccd.

    2.  Open new terminal.

    3.  Type more readme, to see a readme file with useful information.

    4.  Type marccd to start Mar software. You should get the main GUI
        for the Mar CCD system.

    5.  Reboot detector: Select menus: ConfigureDetector. A window
        should appear. At bottom, select REBOOT button. Answer Yes to
        any redundant questions. Answer Yes to restart cooling.

    6.  Test Detector: Acquire single frame by selecting menus: Acquire
        Single Frame. Enter exposure time of 1s, and hit START. You
        should see an image appear on the main window.

    7.  To shut down detector system: Exit the software on the Linux
        box. In hutch, turn off the detector by inserting your finger
        into the hole in the chiller, and switching off the rocker
        switch. Turn off the white heater box. Shut down the computer.
        It is easy. Don't worry about any complicated procedure to warm
        the CCD. Just turn everything off.

    8.  To control the cooling: Select menu: Configure Detector. This
        window has a button to turn cooling on and off. Leave it on.

    9.  Verify pressure. The pressure inside the evacuated CCD camera
        should be below 1Torr. It is shown on the main software window
        near the top. If not, ***DO NOT START THE COOLING.*** Just shut
        down the system and page the Detector Pool at 2-9490. At night,
        call the floor coordinator. The detector needs to be pumped out.

    10. Start Remote Control: Select menus AcquireRemote Control. A
        window comes up with 4 fields which must be filled in. The
        proper parameters are default in the Mar 165 A unit, but must be
        altered for the B unit (this will be fixed later). The readme
        file has the proper parameters. Hit the Start button to start
        Remote control. If the parameters are wrong, the mar software
        can freeze, requiring a restart.

    11. Start EPICS. Open a new terminal and type start_epics. This
        starts a soft IOC, and MEDM. IF the computer is networked
        properly, the PVs will be served to EPICS.

    12. Test EPICS. In the MEDM window, acquire a background image, by
        selecting "background" and hitting the Start button (middle, low
        in the MEDM window). Select "normal" and hit Start again. You
        should see the marccd software take images.

E)  **Troubleshooting** (based on problems that always happen)

    1.  *Can't take picture.*

> This happens when the detector is off, or needs reboot. The detector
> is not communicating with the PC. Check fiberoptic cable. If you can
> take a picture from marccd, but not EPICS, then restart the Mar remote
> control server, restart the EPICS server. IF that fails there is
> probably a network problem.

2.  *What if I have to reboot computer?*

> You can safely reboot the Linux box without damaging the CCD detector.
> Just leave the detector on, and reboot the computer. The detector will
> take care of itself. When restarting marccd, you must reboot the
> detector as in (3) below.

3.  *What if I have to turn off and on the detector?*

> See above instructions (D). Just turn off the detector, turn it on.
> Reboot the detector from marccd software menu ConfigureDetector,
> REBOOT.

4.  *Can't get Spec to control detector.*

> Detector is not running server, or detector is not on network, or on
> wrong subnet. Check to see if mar server is running, EPICS is running.
> Check subnet with ifconfig.

5.  *EPICS PVs white in MEDM.*

> This happens when the soft IOC is not working right. Reboot the soft
> IOC. If that does not fix it then check the network. If the PC is not
> on the network correctly, the IOC will not serve the PVs properly,
> even to a local EPICS client. Fix the network.

6.  *Calibration Files*

7.  What is wrong with the Network?

> Because of ANL's enhanced computer security, getting the Mar onto the
> network at a beamline is a headache. The most common problem is that
> the subnet at the beamline does not recognize the MAC address of the
> detector PC. Type ifconfig to get the MAC address. Set up the detector
> for DHCP (it should already be). A Sysadmin person must configure the
> network to allow the Mar to get onto the subnet. As firewalls are
> constantly changing, and the detector moves all around the ring, the
> network always breaks. The best advice is to test the detector in the
> morning, so computer people can fix the network after lunch.

8.  *Pressure reads ???*

> The CCD detector is not communicating with the PC. Restart everything,
> to try to get the system working again. Go through the aforementioned
> startup procedure.

9.  *Detector will not turn on*.

> This happens when fuses inside the chiller cabinet blow. Call DP staff
> to replace fuses.

F)  Whom to call.

> Floor coordinators. (24 hours)
>
> DP engineers at 2-9490. (M-F 9-5)