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Tunnel Access Questions


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​What are the different FACET tunnel access modes?

Answer Collapse/Expand Text:

​There are two FACET tunnel access modes (Permitted & Guarded. There is no controlled access in FACET):

1). Guarded Access with Radiation Physics Escort - this is designed for short (less than 30 minutes) accesses for one or two experimenters. This access mode minimizes the beam time lost because by guarding the entrance there is no need for a search after the access.


2).  Permitted Access - this is for when longer access is needed or more thanone or two experimenters need to go into the tunnel. This access mobe is used for PAMM. If such an access is required during run time, the experiment may lose as much as a shift of beam so the decision to go in is not done lightly.

More information on the these access modes, how they are done and the impact is found here.

​How do I make an access during a shift?

Answer Collapse/Expand Text:

This constitutes a change in program.

If your program changes, you must contact Mark Hogan immediately (and/or Christine Clarke).

Once approved, follow the steps below.


​1. Plan it. What do you want to do? Make sure you know step by step and have all of the parts to hand. Put the plan in the elog.

2. Estimate time. How long do you require?

->  If it is <30 minutes, it can be done under guarded acces. Otherwise, it needs to be done under permitted access.

3. Tell the EOIC that you need an access. Tell them what time you want the access, how long it will last and what type of access you want. The EOIC may advise you that other times will be easier to support and you may enter negotiations!

4. Ask the EOIC to call RPFO so they can survey. (RPFO need at minimum 2 hours warning).

5. Remeber to turn the beam off an hour before you need to go in!

6. Go in. Access procedure is here.

7. Whilst in access, it is very important to let MCC know what is going on. Otherwise your guard will leave when time is up and we will go into permitted access and a search will be necessary. This will cause many hours of delay. Best thing to do is to have someone in the trailer to field calls between the tunnel and MCC. No one except this dedicated person should call the tunnel for "updates" because this can delay work in the tunnel.

​What do I do if I enter under guarded access and then discover the scope of the job is larger than I thought?

Answer Collapse/Expand Text:

If you are in the tunnel under a guarded access and the job looks like it will take longer than 30 minutes, phone MCC x2151.

Tell them that you wish to go to permitted access and give your new time estimate.

​What do I do if something isn't as it should be in FACET tunnel?

Answer Collapse/Expand Text:

​For example, lights are flashing or there is water on the floor or something appears broken.

Call MCC x2151 and report this.

Depending on the issue, you may also want to tell the Area Manager Al Owens, the Experiment Coordinator Christine Clarke or the safety officer Joe Kenny. MCC operators can help you decide whether more people need to be informed and usually make the phone calls.

​How do I access FACET during downtime?

Answer Collapse/Expand Text:

When FACET is in downtime it is usually but not necessarily in permitted access. We may lock FACET for reasons such as electrical outages, safety system testing or for certification purposes. In addition, there may be activities going on inside FACET that are incompatible with general access such as electrical work or class 4 laser work.

Please see information below about entering and working in FACET during the downtime assuming FACET is in permitted access.


Do I have to be RWT1 or GERT?


FACET is usually a Radiation Area. You need to have RWT1 (up-to-date!) to enter. You need to sign the area RWP.

Remember that anything taken out needs to get surveyed.

It may be de-posted to a RCA in some circumstances. Please pay attention to the signage and remember your GERT and RWT safety training. Even when it is deposted, you need to be RWT trained to do any work. GERTs can enter FACET but they cannot handle any material when FACET is deposted to an RCA.



Is Area Manager release needed or not?


Green work is released in FACET if you...

 – Always follow the AHA (displayed at the entrance), 

– Remember your training (you should have course AD103 or equivalent training in FACET hazards or be escorted by someone that has),

 –Observe ongoing activities in the area in the event hazards may be present which require your attention.

You do not need further release from the Area Manger if this is followed.


Yellow work (non-observational work/work with tools):

Come to Christine Clarke if you have any non-green work to perform. Work that is done in FACET still requires Area Manager approval. Cell phones are listed in the directory if you are on the SLAC network (use VPN if you are offsite or on the visitor net).

Non-routine tasks or tasks with safety risks need a procedure. See separate question on procedure writing.

All "yellow" work in FACET is documented by Christine in the CATER system. It also needs a radiological review so please let me know how many people for how many hours.

Downtime jobs should be submitted as soon as possible. At the very latest, the Thursday before the week in which you want to do the work. Depending on the job, it may or may not be easy to schedule.

There will be a meeting before work gets started for work release and safety briefings.



Large groups of visitors, tour groups, photo opportunities and equivalent activities require a release from Al Owens.


Work Planning and Control training (course 120):

Access Requirements (GERT 115 and RWT1 116 training):​ 

SLAC SLAC National Accelerator Laboratory, Menlo Park, CA
Operated by Stanford University for the U.S. Dept. of Energy