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protondriver.doc - Proton Driver and Its Applications.doc


Proton Driver Section: Fermilab has recently completed a design study for a Proton Driver. It describes in detail the design of a new brighter booster, called the Proton Driver, as a complete functional replacement for the present Booster. The design report has been published as a technical memo FERMILAB-TM-2136. It can also be downloaded from the web: http://www-bd.fnal.gov/pdriver/reports.html. The Proton Driver is a rapid-cycling (15 Hz), high-intensity (3 × 1013 protons per pulse), 1 MW 16-GeV synchrotron. It serves a number of purposes in the Fermilab hadron program. In the near term, it replaces the present Booster and increases the proton beam intensity in the Main Injector by a factor of four, thereby providing an upgrade path for NuMI and other 120 GeV fixed target programs. It also opens the avenue for new physics programs based on its stand-alone capabilities as a source of intense proton beams. The beam power of the Proton Driver is a factor of twenty higher than that of the present Booster. It can be employed for the production of high-intensity secondary particle beams of pions, kaons, neutrons and neutrinos. In the long term, the Proton Driver can serve a neutrino factory and a muon collider by generating intense short muon bunches from a target. The design also allows an upgrade path to a 4 MW proton source by adding a 600 MeV linac and a 3 GeV Pre-Booster at some late time (called Phase II). To meet the requirement of a muon collider, such as a Higgs factory, the number of bunches in Phase II will be reduced to four. The main parameters of the Proton Driver in Phase I and Phase II are listed in Table 1. As a comparison, the parameters of the present proton source are also listed.

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Table 1. Parameters of the Proton Driver: Present, Phase I and Phase II

Parameters Linac (operating at 15 Hz) Kinetic energy (MeV) Peak current (mA) Pulse length (?s) H- per pulse Average beam current (?A) Beam power (kW) Pre-Booster (operating at 15 Hz) Extraction kinetic energy (GeV) Protons per bunch Number of bunches Total number of protons Normalized transverse emittance (mm-mrad) Longitudinal emittance (eV-s) RF frequency (MHz) Average beam current (?A) Target beam power (MW) Booster (operating at 15 Hz) Extraction kinetic energy (GeV) Protons per bunch Number of bunches Total number of protons Normalized transverse emittance (mm-mrad) Longitudinal emittance (eV-s) RF frequency (MHz) Extracted bunch length σt (ns) Average beam current (?A) Target beam power (MW)

Present

Phase I (MI, ν-Fact) 400 60 90 3.4 × 1013 81 32

Phase II (?-Coll) 1000 80 200 1 × 1014 240 240 3 2,5 × 1013 4 1 × 1014 200 π 2 7.5 240 720

400 40 25 6.3 × 1012 15 6

8 6 × 1010 84 5 × 1012 15 π 0.1 53 0.2 12 0.1

16 1.7 × 1012 18 3 × 1013 60 π 0.4 7.5 1 72 1.2

16 2.5 × 1013 4 1 × 1014 200 π 2 7.5 1 240 4

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