CAT Chat Minutes

September 22, 1995


Issues that require action and/or follow-up
How will the coordination be done in installing critical components and the associated PSS, and white beam stops?

The APS has developed a general plan for this implementation. The following excerpt from our White Beam Policy is important to this plan:  The policy of the APS is to require a white beam stop in every experimental station where the white beam has to be stopped. In addition, the PSS will be incorporated in the white beam stop.

The critical components will be inspected, surveyed, and aligned by the APS. The PSS on the white beam stop will be designed, installed, checked out, operated, and maintained by the APS.

It is important to differentiate between the critical components (i.e., mask, collimator, etc.) and the white beam stop. The white beam stop is a requirement for the personal safety, while a critical component has to be safeguarded using a equipment protection system. That being the case, APS will control the installation white beam stop, and only be an observer for other critical components.

The CATs will hence provide the white beam stop and associated supports along with their detailed drawings and technical specifications to the APS. The APS has the following responsibilities:

1. Align the component on its support and measure the apertures with reference to the fiducials or the flanges of the chamber. Record these data.

2. Use the trades people to install all pneumatics and electrical conduits.

3. The APS will provide the trades people with necessary hardware like boxes and pneumatics control, limit switches.

4. APS personnel will check the installation and test the white beam stop and finish termination of all wiring.

5. APS personnel will also install two methods of interlocking for the cooling of the white beam mask. Namely flow and pressure. These will be similar to the ones used in the front ends employing v cone flow meters hooked up to transmitters.

6. APS personnel will install the white beam stop at the CAT designated location in the beamline and align the white beam stop.

7. APS personnel will test the device in location and connected to the station PSS. (CATs will have to provide air and DI water for the component.)

8. APS staff will validate the shielding adequacy of the component as part of the commissioning.

For steps 1-7 the CATS will be billed for labor and material by the APS.

In regard to safety, does the APS take an oversight role or a support role?

A brief answer:  The APS does not intend to be solely oversight. In fact, our main interest is to be useful to the CATs on all safety matters. Indeed, at Argonne there are already organizations with prescribed surveillance responsibilities that also provide technical support. The APS is trying to build on this precedent and protect its users from the problems that would inevitably result if the primary surveillance came from an outside, possibly narrow- thinking, compliance-oriented organization.

CATs can turn to whomever they choose for help in planning, designing and implementing hazard controls. But the APS staff specializing in ES&H will always provide this help. If the requirements demand special knowledge, the APS will arrange to get help and advice on those issues from the ES&H specialists in the Laboratory.

Your first point of contact for seeking help will be the XFD ES&H Coordinator with whom you can discuss individual concerns to see what type and level of support APS can provide you as you attempt to resolve the concerns.

Who will be responsible for the safety of the experiments performed by the CATs and the independent investigators using the CAT beamlines?

According to the guidelines in the CAT Safety Plan, the CAT will evaluate the safety aspects related to all the experiments performed on their beamlines. If the CAT requires a second opinion on any safety issue, the XFD ES&H Coordinator should be contacted for help. Information items

Update on planned beamline commissioning time during October 95 operation of the storage ring:  The plans are still fluid, and we will update you at the next CAT Chat. At present it appears that the storage ring will be operated during the first two weeks of October primarily for the machine physics studies leading to higher currents of operation. There are no planned beamline commissioning activities during these two weeks.

The machine will be then shut for a period of two weeks (week of Oct. 16 for the major meetings, and the following week). Hence, the next operation will begin roughly during the week of Oct. 30. In November, we will probably have many beamlines ready for commissioning. These include, 1-BM and 1-ID for higher current operations, 2-BM, 5-BM, 12-BM, 2-ID, and 3-ID for first radiation commissioning. The order of their commissioning will be developed soon.

The cost of installation of PSS:  The minutes of the last CAT Chat (September 15, 1995) described the procurement process through breakdown of the system into subcomponent installation. Since the cost of each installed subcomponent is under $5K, the charges will go against user M&S accounts. This convenience unfortunately has a cost penalty. The M&S accounts have normal ANL overhead.