Canon PowerShot G9
ƒ/2.8
7.4 mm
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I found myself on the Stanford campus last night with my son, and I asked him if he’d like to try to sneak into End Station III. His eyes lit up because he had heard my memories of my last visit, many moons ago, as a grad student:

… the incredibly bizarre “End Station 3” nestled underground in the engineering campus. It’s a strange building with no windows and peculiar, yet fetching, warning signs (“no animal experiments in this area”). After going underground a bit, you find yourself on a metal gang plank overlook looking down into a cavernous football-field-sized room with 5-ton cranes overhead on rail tracks, and little people below. (flickr memories)

The entry door that I found propped open 20 years ago was locked and reinforced. I used my phone to email an old dorm mate from that era to see if he might still be inside (he has been continuously working on Gravity Probe B ever since I was a EE PhD neophyte with him) but alas he was out. We drove around the perimeter, checking the doors. And then my son spotted a student entering the building. Bingo. We were in.

It looks just like I remembered it, with a cornucopia of microwave pipes and wires (partially seen here on the bottom right). Last time, I entered on the top right. The three tunnels on the far “S” (south) side lead off to experimental bays, and must be the loci of sundry X-File activities. The building on the bottom left reminds me of the RF-shielded rooms we used at HP for microwave circuit testing.

The animal signs were no longer there, but they do have a new enormous diesel power generator in shiny black. (As an aside, when the new Bio-X building went in, the animal lab is located in the basement, and there are escape tunnels that run under the street and exit to unmarked doors in an underground parking garage.)

P.S. Josh posted some interesting background research and diagrams of End Station III in an earlier discussion.

9 responses to “End Station III”

  1. I’m going to have a nightmare tonight about my daughter having to do show and tell in class on the same day as your son.

    "And what does your dad do, Ava?"

  2. too cool, J! I have great memories of late night expeditions with my neighbor to a physics lab as a youngster. It was a mystical place for a kid…radiation monitors clicking would let you know you entered into a different world full of strange mechanical devices, complete with wall clocks that would run backwards. It was always a rare treat when I could sit down at the terminal and play Star Trek. Wish I had the manual back then!

    good times!!

  3. It’s certainly the most interesting building I’ve been in on the campus. They beefed up the crane to 45 tons now… pretty neat toy. Especially useful if you need to lift a stack of cars or a tank. The construction information plaque on the loading doc details how many tons of concrete went into making the 7-foot-thick walls. Did you walk across that scaffolding-looking walkway at the upper left of your photo? The thing is iron mesh and attached to the wall by "tiny-looking" bolts — you see 70 feet beneath your feet… rather disconcerting!

  4. What…no water balloons and surgical-tubing slingshots? You must be getting old!

  5. I was sorry to see that funding to complete the data analysis of the GP-B experiment was cut by NASA. Hopefully, other sources of funds will be identified. I visited Stanford sometime in the early 90s on another subject, and visited with the GP-B folks. Took the dungeon tour where they were making the prototypes of the gyros – that little old lens maker sure was making magic. Fascinating stuff.

  6. Ditto, facinating stuff!

  7. Hey, that’s (sadly) where my office is!

    Hansen Experimental Physics Labs (HEPL) End Station III (ESIII) was originally designed to house a large particle detector. (Think of the recent pictures you’ve seen of the LHC detector.) It is at the end of a long tunnel that housed a linear accelerator. This was from before SLAC was built. However, I don’t think a detector ever made it in there.

    The space is currently used for a variety of experiments. For example, when you took this photo there was probably a big white truck to your left. In that truck is an experiment which uses atom interferometry to measure the local gravity. The truck allows the experiment to be mobile. It’s is typically parked just inside ESIII because the pit (a large volume of missing matter) provides a large signal.

    Until recently, the tunnel housed the HEPL SuperConducting Accelerator (SCA), which was primarily used to make a Free Electron Laser (FEL). The first linear accelerator as well as the first FEL were made at Stanford in HEPL. With the advent of the FELs, the HEPL accelerators transitioned from being used for particle physics to become a tool for specialized high power, picosecond pulsed laser experiments since the FEL could be continuously tuned through mid and far infrared (IR) wavelengths. The mid-IR was primarily used for medical experiments since the laser could be tuned, for example, to specific protein absorption lines. The far-IR was useful for solid state physics experiments since the laser could be tuned through inter-subband transition energies. This (my work) was aided by the use of an 8 Tesla superconducting magnet.

    I was the last student/person to use the Stanford FEL to do science (magneto-optical experiments on semiconductor materials) before the demolition of the main HEPL building. It was demolished to make way for the continuing construction of the new Science and Engineering Quad.

    If you ever want to get back in ESIII, give me a call. I’m just spending the next few months trying to finish up my thesis. Unfortunately, the most interesting part, the tunnel, is off limits because of the construction over head.

  8. Doug_Dirac_Delta: fascinating background story. Yes, I saw that truck, and three guys were working on the experiment. In using a truck (vs. a sliding table or semi-fixed rig), are they thinking about a roving experiment for the future?

    Thanks for the offer. The "Off Limits" tunnel in particular… =)
    The best things always are… like the Dish

  9. a reference to these campus adventures is now featured on the Stanford Alumni home page

    Adventures on Alumni Home Page

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