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U. S. Energy Research & Development Administration
Washington, D. C. 20545

June 1977




High Energy Physics Advisory Panel (HEPAP) Subpanels appointed in 1974 (the Weisskopf Subpanel) and 1975 (the Low Subpanel) have considered and made recommendations on the construction of those future facilities required to maintain the vitality of the field of High Energy Physics in the United States. The recommendations of the 1975 Subpanel, in brief, were:

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...authorization in FY 1976 of the LBL/SLAC proposal to
construct the electron-positron colliding beam facility

...authorization in FY 1977 of the BNL proposal for the construction of the proton-proton colliding beam facility ISABELLE. This facility is designed to operate at energies between 30 and 200 GeV per beam with a peak luminosity of 1033cm-2sec-1.

...that funds be provided to support an accelerator
development program at Fermilab directed toward the long-
term goal of fixed target and/or colliding beam systems
in the region of 1000 GeV and above, and we recognize the
Energy Doubler/Saver as a proper step to this end....."

Since the issuance of the report of the 1975 Subpanel, the following important developments have occurred:

The Stanford Linear Accelerator Center-Lawrence Berkeley Laboratory (SLAC-LBL) Positron-Electron Storage Ring project (PEP), recommended as the top priority construction project by both the 1974 and 1975 Subpanels, has been authorized and is now in the process of construction.

- Although the Brookhaven National Laboratory (BNL) proton-proton storage ring ISABELLE has not yet been authorized, there has been very substantial progress in the research and development (R&D) effort, and serious consideration has been given by the BNL group to the design of a higher energy version of the machine.


The Fermi National Accelerator Laboratory (Fermilab) Energy Doubler/Saver (ED/S) R&D project is well underway and very substantial advances in development of ED/S superconducting magnets have been achieved. Furthermore, the investigation of techniques which offer the possibility of useful luminosity in proton-antiproton colliding beams has been initiated.

The pace of new discoveries in High Energy Physics has continued unabated. Conclusive experimental proof for the existence of a new property of matter entitled "charm" has been obtained, and evidence for other remarkable phenomena has been uncovered.

Thus, the program recommended by the 1975 Subpanel is underway, although at a slower pace than envisaged.

The results of the R&D efforts of the last 2 years have been incorporated into several new or updated construction proposals.

The 1977 Subpanel on New Facilities was formed in February 1977. The Charge to the Subpanel is given in Appendix A.

The specific construction projects proposed by the laboratories for FY 1979 funding were:


This project consists of a proton-proton colliding beam facility (ISABELLE), employing superconducting magnets, to contain beams injected from the BNL Alternating Gradient Synchrotron (AGS) and accelerated to full energy within the ISABELLE rings. The initial

proposal was for beams of energy3 up to 200 GeV per beam and estimated luminosities up to 10- cm-2sec-1. An alternative proposal, of great physics interest, made possible by recent improvements and economies in magnet performance and accelerator design, describes a project that can achieve energies up to about 400 GeV per beam.

2a. Energy Doubler/Saver

Tevatron (Fermilab)

The Tevatron is based on the present R&D project to develop a coasting beam in a ring of superconducting magnets to be installed in the Fermilab main ring tunnel. The formal construction

proposal from Fermilab comprises:

1) conversion of the ring of superconducting
magnets to an accelerator capable of
attaining proton energies of 1000 GeV


(1 TeV), with an appropriate extraction
system, and an average intensity of at
least 1012 protons per second;

ii-iv) modifications of the Neutrino, Proton,
and Meson Areas for use with 1000 GeV


2b. Colliding Beams Experimental Facility (Fermilab)

The development of a capability to bring counter-rotating proton beams in the Doubler/Saver and main ring into collision is proposed. A further aspect of this effort is the production of collisions between counter-rotating proton and antiproton beams in the Doubler/ Saver ring. A formal proposal to implement such use comprises:


1) the provision of detector enclosures at
each of two intersection points, together
with major technical components and
associated service facilities;

ii) an antiproton production facility consisting
of a 100 GeV proton extraction system in the
main ring, a beam transport system, and
an antiproton production target facility.

PEP Upgrade (SLAC-LBL)

Included as part of the long range plans of SLAC and LBL was a plan to increase the energy of the PEP electron-positron facility from 15 x 15 GeV to 24 x 24 GeV. This upgrading, whose purpose is to extend the experimental capability into an energy range of particular significance for the study of weak interactions, requires a substantial expansion of the RF system and some expansion of power supplies for the magnets. A formal construction proposal is expected in the near future, but was not available at the time of the Woods Hole meeting.

A preliminary meeting was held at Fermilab on March 17, 1977, to plan the schedule for the work of the Subpanel. The Accelerator Subgroup of the Subpanel, with its consultants, gave specific attention to the technical aspects of the new facilities to be considered by the Subpanel as a whole. The Subgroup made 2-day visits to BNL and Fermilab, respectively, to hear presentations concerning current R&D activities and the construction proposals prepared by each of these laboratories. These visits offered

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