\title{\hfill BNL-65-623\phantom{Laaaaaaaa}\\
\hfill Fermilab-PUB-98/179\\
\hfill LBNL-41935\phantom{Laaaaaaa}\\
%\Huge {\bf{DRAFT}}\\
Status of Muon Collider Research 
and Development and Future Plans}
\author{
Charles~M.~Ankenbrandt,$^1$
% Giorgio~Apollinari,$^2$ 
 Muzaffer~Atac,$^1$            
 Bruno~Autin,$^2$             
 Valeri~I.~Balbekov,$^1$
 Vernon~D.~Barger,$^3$           
 Odette~Benary,$^4$
 J.~Scott~Berg,$^5$
 Michael~S.~Berger,$^5$
 Edgar~L.~Black,$^6$
 Alain~Blondel,$^7$
 S.~Alex~Bogacz,$^8$
 T.~Bolton,$^9$            
 Shlomo~Caspi,$^{10}$            
 Christine~Celata,$^{10}$    
% Yong-Chul~Chae,$^{11}$
 Weiren~Chou,$^1$                          
 David~B.~Cline,$^{11}$
 John~Corlett,$^{10}$
 Lucien~Cremaldi,$^{12}$             
%\author[DOE]{% Philip     Debenham  },            
%\author[DOE]{% Robert E.  Diebold    },             
 H.~Thomas~Diehl,$^1$          
 Alexandr~Drozhdin,$^1$
 Richard~C.~Fernow,$^{13}$
 David~A.~Finley,$^1$
 Yasuo~Fukui,$^{14}$              
 Miguel~A.~Furman,$^{10}$
 Tony~Gabriel,$^{15}$          
 Juan~C.~Gallardo,$^{13}$\thanks{Corresponding author. 
                                 Email:gallardo@bnl.gov}
 Alper~A.~Garren,$^{11}$
 Stephen~H.~Geer,$^1$
 Ilya~F.~Ginzburg,$^{16}$             
 Michael~A.~Green,$^{10}$
 Hulya~Guler,$^{17}$         
 John~F.~Gunion,$^{18}$             
 Ramesh~Gupta,$^{10}$
 Tao~Han,$^3$
 Gail~G.~Hanson,$^5$
% Katherine~C.~Harkay,$^{11}$
 Ahmed~Hassanein,$^{19}$  
% Ady~Hershcovitch,$^{13}$
 Norbert~Holtkamp,$^1$           
 Colin~Johnson,$^2$             
 Carol~Johnstone,$^1$           
 Stephen~A.~Kahn,$^{13}$
 Daniel~M.~Kaplan,$^6$ 
 Eun~San~Kim,$^{10}$            
 Bruce~J.~King,$^{13}$           
 Harold~G.~Kirk,$^{13}$             
% Masayukiu~Kumada,$^{17}$
 Yoshitaka~Kuno,$^{14}$             
 Paul~Lebrun,$^1$       
 Kevin~Lee,$^{11}$
 Peter~Lee,$^{10}$             
 Derun~Li,$^{10}$         
 David~Lissauer,$^{13}$
 Laurence~S.~Littenberg,$^{13}$             
 Changguo~Lu,$^{17}$
 Alfredo~Luccio,$^{13}$  
 Joseph~D.~Lykken,$^1$ 
 Kirk~T.~McDonald,$^{17}$             
 Alfred~D.~McInturff,$^{10}$
 John~R.~Miller,$^{20}$           
 Frederick~E.~Mills,$^1$          
 Nikolai~V.~Mokhov,$^1$            
 Alfred~Moretti,$^1$
 Yoshiharu~Mori,$^{14}$             
 David~V.~Neuffer,$^1$             
 King-Yuen~Ng,$^1$         
 Robert~J.~Noble,$^1$         
 James~H.~Norem,$^{19,1}$             
% Blaine~E.~Norum,$^{20}$             
% Hiromi~Okamoto,$^{21}$            
 Yasar~Onel,$^{21}$             
 Robert~B.~Palmer,$^{13}$ 
 Zohreh~Parsa,$^{13}$       
% Jack~M.~Peterson,$^{10}$
 Yuriy~Pischalnikov,$^{11}$              
 Milorad~Popovic,$^1$             
 Eric~J.~Prebys,$^{17}$             
 Zubao~Qian,$^1$
 Rajendran~Raja,$^1$
 Claude~B.~Reed,$^{19}$             
 Pavel~Rehak,$^{13}$            
 Thomas~Roser,$^{13}$           
 Robert~Rossmanith,$^{22}$
% Nicholas P. Samios,$^{13}$              
% Jack~Sandweiss,$^{23}$             
 Ronald~M.~Scanlan,$^{10}$             
% Lindsay~Schachinger,$^{10}$           
 Andrew~M.~Sessler,$^{10}$ 
 Brad~Schadwick,$^{10}$             
 Quan-Sheng~Shu,$^8$         
 Gregory~I.~Silvestrov,$^{23}$             
 Alexandr~N.~Skrinsky,$^{23}$
 Dale~Smith,$^{19}$
 Panagiotis~Spentzouris,$^1$  
 Ray~Stefanski,$^1$     
 Sergei~Striganov,$^1$             
 Iuliu~Stumer,$^{13}$          
 Don~Summers,$^{12}$             
%\author[DOE]{ David F.   Sutter     },             
%\author[Cornell]{ Richard    Talman},
% Valery~Tayursk,$^{25}$             
 Valeri~Tcherniatine,$^{13}$
 Lee~C.~Teng,$^{19}$   
%\author[LANL]{ Arch       Thiessen},             
 Alvin~V.~Tollestrup,$^1$             
 Ya\u{g}mur~Torun,$^{13,24}$             
 Dejan~Trbojevic,$^{13}$            
 William~C.~Turner,$^{10}$
 Sven~E.~Vahsen,$^{17}$            
 Andy~Van~Ginneken,$^1$            
%\author[CERN]{ Friedrich  Voelker},             
 Tatiana~A.~Vsevolozhskaya,$^{23}$            
% Masayoshi~Wake,$^{14}$
 Weishi~Wan,$^1$
 Haipeng~Wang,$^{13}$             
 Robert~Weggel,$^{13}$             
 Erich~H.~Willen,$^{13}$          
%\author[col]{ William J. Willis},
 Edmund~J.~N.~Wilson,$^2$             
 David~R.~Winn,$^{25}$           
 Jonathan~S.~Wurtele,$^{26}$
 Takeichiro~Yokoi,$^{14}$             
% David U.L. Yu,             
 Yongxiang~Zhao,$^{13}$        
 Max~Zolotorev$^{10}$   % no comma for last author
}   
\address{
$^1$Fermi National Laboratory, P. O. Box 500, Batavia, IL 60510\protect\\
%$^2$Rockefeller University, New York, NY 10021\protect\\
$^2$CERN, 1211 Geneva 23, Switzerland\protect\\
$^3$Department of Physics, University of Wisconsin, Madison, WI 53706\protect\\
$^4$Tel-Aviv University, Ramat-Aviv, Tel-Aviv 69978, Israel\protect\\
$^5$Physics Department, Indiana University, Bloomington, IN 47405\protect\\
$^6$Illinois Institute of Technology, Physics Div., Chicago IL 60616\protect\\
$^7$\'{E}cole Polytechnique, Lab. de Physique Nucl\'{e}aire et de Hautes Energies, Palaiseau, F-91128, France\protect\\
$^8$Jefferson Laboratory, 12000 Jefferson Ave.,
Newport News, VA 23606\protect\\
$^9$Kansas State University, Manhattan, KS 66502-2601\protect\\
$^{10}$Lawrence Berkeley National Laboratory,
1 Cyclotron Rd., Berkeley, CA 94720\protect\\
$^{11}$University of California Los Angeles, Los Angeles, CA 90095\protect\\
$^{12}$University of Mississippi, Oxford, MS 38677\protect\\
$^{13}$Brookhaven National Laboratory,
Upton, NY 11973\protect\\
$^{14}$KEK High Energy Accelerator Research Organization,
1-1 Oho, Tsukuba 305, Japan\protect\\
$^{15}$Oak Ridge National Laboratory, Oak Ridge, TN 37831\protect\\
$^{16}$Institute of Mathematics, Prosp.\ ac. Koptyug 4, 630090 Novosibirsk, 
Russia\protect\\
$^{17}$Joseph Henry Laboratories, Princeton University, Princeton, NJ 
08544\protect\\
$^{18}$Physics Department, University of California,
Davis, CA 95616\protect\\
$^{19}$Argonne National Laboratory, 
Argonne, IL 60439\protect\\
%$^{18}$National Institute of Radiological Sciences,
%4-9-1 Anagawa, Inage, Chiba, Japan\protect\\
$^{20}$Magnet Science \& Technology, National High Magnetic Field Laboratory, FL 32310\protect\\
%$^{20}$University of Virginia,
%205 McCormick Road, Charlottesville, VA 22901\protect\\
%$^{21}$N.S.R.F, Institute for Chemical
%Research, Kyoto University, Gokanoshou, Uji, Kyoto 611, Japan\protect\\
$^{21}$Physics Department, Van Allen Hall,
University of Iowa, Iowa City, IA 52242\protect\\
$^{22}$Research Center Karlsruhe, D-76021 Karlsruhe, Germany\protect\\
%$^{23}$Physics Department, Yale University, CT 06520\protect\\
$^{23}$ Budker Institute of Nuclear Physics, 
630090 Novosibirsk, Russia\protect\\
$^{24}$Department of Physics and Astronomy, SUNY, Stony Brook, NY 11790\protect\\
%$^{24}$ Los Alamos National Laboratory, Los Alamos, NM 87545\protect\\
$^{25}$Fairfield University, Fairfield, CT 06430\protect\\
$^{26}$University of California Berkeley,
Berkeley, CA 94720
}

\date{\today}
\maketitle
\begin{abstract}

  The status of the research on muon colliders is discussed and plans
are outlined for future theoretical and experimental studies.  Besides
continued work on the parameters of a 3-4 and 0.5~TeV center-of-mass (CoM)
energy
collider, many studies are now concentrating on a machine near 0.1~TeV
(CoM) that could be a factory for the $s$-channel production of Higgs
particles.  We discuss the research on the various components in such
muon colliders, starting from the proton accelerator needed to
generate pions from a heavy-$Z$ target and proceeding through the 
phase rotation and decay 
($\pi \rightarrow \mu\,\nu_{\mu} $) channel, muon cooling,
acceleration, storage in a collider ring and the collider
detector. We also present theoretical and experimental R \& D
plans for the next several years that should lead to a better 
understanding of the design and feasibility issues for all of the
components. This report is an update of the progress on the R \& D
since the Feasibility Study of Muon Colliders presented at the
Snowmass'96 Workshop  [R.~B.~Palmer, A.~Sessler and A.~Tollestrup, 
{\em Proceedings of the 1996 DPF/DPB Summer Study on High-Energy Physics} 
(Stanford Linear Accelerator Center, Menlo Park, CA, 1997)].

\end{abstract}
%\end{frontmatter}
\pacs{13.10.+q,14.60.Ef,29.27.-a,29.20.Dh}