Re: FW: Hoover Dam underground lab

From: Janet Conrad <>
Date: Wed Jul 28 2004 - 11:25:05 CDT


Thank you so much for investigating this! That's 323 mwe -- in other
words, PERFECT!
The room size also sounds like it will work well. I will investigate
this further.


Dick Hahn wrote:

>Based on the comment by Janet during today's phone call about Hoover Dam, I
>communicated with Hank Sobel at UCI.
>His two replies follow:
>-----Original Message-----
>From: Dick Hahn []
>Sent: Tuesday, July 27, 2004 8:56 AM
>To: Sobel, Hank
>Subject: Hoover Dam underground lab
>Hi Hank,
> As I may have told you, I am currently involved in planning
>discussions for a future theta-13 experiment. In a conference phone call
>today, someone mentioned the idea of doing some prototype measurements
>underground (under water?) at Hoover Dam. I recall that when you, Toni,
>Sheila, and I
>visited the Dam, you mentioned that you had done a neutrino experiment
>there with Fred et al. years ago. Are there are any details written down
>someplace about the properties of the Hoover Dam lab, such as
>overburden, available space, etc.?
>Best regards,
>-----Original Messages-----
>From: Henry W. Sobel []
>Sent: Tuesday, July 27, 2004 1:35 PM
>To: 'Dick Hahn'
>Cc: Michael Moe
>Subject: RE: Hoover Dam underground lab
>Message # 1
>Hi Dick,
>Mike Moe had a lab in the dam where he did his Double Beta Decay
>experiments. I'll look and see if there is anything around, but probably
>Mike would have all that information.
>Message #2
>Here is a write-up about the site that I found in our 1989 DOE renewal:
>A very satisfactory underground site has been found where there is good
>protection from cosmic radiation. The room is 35 x 114 x 40 feet high
>and houses the "Arizona tunnel plug outlet works" at the Hoover Dam.
>This cavity is beneath nearly 400 feet of rock, has easy horizontal
>access, plenty of power and cooling water for the magnet, and a 20-ton
>overhead crane. We have approval from the Project Manager to put the
>experiment in place in September of this year (1988).
>The distance from UCI is 295 miles, a five-hour drive or a one-hour
>flight to nearby Las Vegas. We plan to set up a telephone link to
>monitor the detector from UCI, and the people at the dam have agreed to
>do a daily check for us.
>The cosmic flux will be two orders of magnitude below what we have been
>living with. Natural radioactivity in the walls of the tunnel has been
>found to be the same as at the present location in our Physical Sciences
>building. (By erecting a water shield around the whole apparatus at
>Irvine we found that the natural activity of the room has only a minor
>effect inside the TPC.)
Received on Wed Jul 28 11:25:08 2004

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