The charge to the committee can be found here. The draft agenda can be found at this location. As stated there "Bob Ducar will present Dave Pushka's material". Bob will also discuss which abnormal conditions for the RAW system should go into the Beam Permit system.
The final report of the committee can be found here.
PDF files of presentations are here. The Ideas slides from the presentation by Ernie Villegas were added after 6/12.
Documents added 6/8/01 or 6/11/01 start here.
This document is an update to the description of the scope of WBS element 1.1.4 in the NuMI Technical Design Report, November, 1998.
This is a detailed report of the work by the IHEP group on the advanced conceptual design of the NuMI Hadron Beam Absorber Core. It makes the assumption that there would be sufficient space in the Absorber Cavern to extract modules from the side. After a period of extended study in the Summer and Fall of 2000 it was concluded that such space could not be provided.
The current design utilizes the IHEP design to the extent possible, but has water cooling pipes routed to the beam north end of the core.
This work shows a water-cooled steel module following the eight water-cooled aluminum modules. The water-cooled steel module has been eliminated from the design; it has been replaced with passive steel.
Mark Reichanadter had problems printing this report. So did Linc Read. The solution for Linc was an upgrade from Acrobat 3 to Acrobat 4.
Shielding calculations for the NuMI Hadron Absorber that were done to develop costs for the November, 1998 Lehman DOE Baseline Review are described.
This report presents the results of work done on the Conceptual Design of the NuMI Hadron Absorber in the period between the 11/98 Lehman DOE Baseline Review and 10/99. The main features of this work were the change in lateral size of the water-cooled core of the Absorber, a study (with MARS ) of energy deposition in the core materials, the use of MARS runs to calculate star densities (with the effects on groundwater irradiation in mind), and an evaluation of how well MARS predicts residual radioactivity.
The shielding geometry in this report has cylindrical symmetry. An effort was begun in Summer and Fall of 2000 to update the study to a shielding geometry more representative of that shown in the IHEP report. However, time did not permit completion of that effort. That effort continues now, with Larry Wai from Stanford University providing the manpower.
This is an ANSYS study of temperature and stress in aluminum core module #4. The energy deposition numbers used in this study correspond to the full beam intensity missing the target and reaching the absorber. This would be a very unlikely scenario in the current design for the low energy neutrino beam, since the baffle design and the width of the target have been modified to meet the concern that a small radial shift of the beam position in the Main Injector could have resulted in the proton beam to the NuMI Target shifting its position at the target so as to bypass the target material. The cooling arrangement is that described in NuMI Report 652.
There is the caveat that in his study Bob holds the temperature of the cooling water constant. However, if we are delivering 400 kW of beam onto the Absorber core for an hour, the RAW system for the Absorber isn't sized to dissipate that much beam power, so the assumption of constant cooling water temperature is not necessarily valid. The RAW cooling system is described at this location.
Bob is doing a further study with the cooling design of Ernie Villegas. A report for that study is not yet available, but it will be described during Bob's presentation at the review (see later for this update).
This is NuMI report 709. It gives results of energy deposition calculations for LE and ME configurations of the PH2 focusing system in different parts of the beamline and includes the effect of a possible beam plug and the hadronic hose. Energy distributions in front of the beam absorber are also given.
Included here is a study (PDF, 1.5 Mbytes) of the neutron fluence in the aluminum in the Absorber core. It doesn't seem large enough to be worrisome.
Here is a description of this system (provided by Dave Pushka).
Dave has also provided 10 copies of drawing 8875-117-MC-363721 (NuMI Water System Piping & Instrumentation Diagram Legend) and drawing 8875.117-MD-363032 (NuMI Absorber RAW System). These are copies made on a copy machine and are not full size. Full size drawings can be found on a rack near the west elevators on WH12. Committee members wanting early handouts of printed materials can contact A. Wehmann; otherwise they will be handed out at the review.
Two transparencies have been selected from the WBS 1.1.4 presentation at the 5/22-24 DOE Review of NuMI. The first shows a view of the Absorber Core; the second shows a view of the Absorber Cavern and a stage of the installation. These graphic views were created by Ernie Villegas, from his Ideas 3D modelling package.
Like the earlier study this is an ANSYS study of temperature and stress in aluminum core module #4. The difference is that the cooling configuration that Ernie Villegas has designed is what is studied (not the IHEP cooling configuration).
An update of this document is available.
Here is a poster from the Minos Web site, describing how a Neutrino beam is made.
This is a link to the Updated TDR chapter on radiation safety. It is a link borrowed from the web site for the 4/4/01 Director's Review of the NuMI project.
Here is a reference to Rigging Gear Sales found on the WWW. These are the people who can supply the Mini-Jack crane and Twin Lift that we are planning on utilizing for installation of the Absorber.
Here is a link to the web site for 4 Point Lift Systems, Inc. The Twinlift we are considering is shown here. Rigging Gear Sales is a major distributor of the equipment made by 4 Point Lift Systems.