Who is this Mark fellow, and why does he have so much equipment? 

There are two branches on the Mark family tree at Stanford University. Mark is the name that has been given to several generations of both accelerators and detectors created and used at HEPL and here at SLAC.  The accelerators were all built on campus at HEPL, and were progenitors of the two-mile accelerator that was built at SLAC. The detectors have all (so far) been built at SLAC. 

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Mark I          1947              Electrons first successfully accelerated 

                                               using a wave-guide accelerator

Mark II        1949                First successful operation

Mark III      1949                Construction begins

                       1950                First successful operation

                       1963-64        Disassembled and re-built with new 

                                                accelerator sections

Mark IV      1954                Support received from AEC to build 

                                                as a test-bed for the two-mile accelerator

                      1964                Dismantled


For more detail on Mark and other Stanford accelerators, see the "Linear Accelerators Constructed at Stanford," table from Mary Clarke's inventory of Edward Ginzton's papers held by the Stanford University Archives.


Hansen with grad students and Mark I accelerator
First 3-foot section of MARK I electron linear accelerator at Stanford University (campus) being held on the shoulders of William Hansen and three of his students, 
Stan Kaisel, Clare Carlson and Bill Kennedy, 1947.  (Stanford University)
Karl Brown at Mark II controls
Karl Brown at the klystron controls for the Mark II accelerator in 1949 or 1950. (Stanford University)
Mark II accelerator at Stanford
An undressed section of the Mark III accelerator at Stanford (shown without its concrete shielding blocks) (Stanford University)
Mark IV accelerator at Stanford
Mark IV accelerator: The Mark IV was designed as a vehicle for improving accelerator components, but was also used at times for beta-ray cancer therapy.  (Stanford University)


Mark I          1973                Installed at SPEAR

                        1977               Dismantled and removed from SPEAR

Mark II        1977                Installed at SPEAR

                       1979                Moved to PEP at beginning of PEP program

                       1982                 Selected to be first detector at SLC

                       1985                 Upgraded and returned to PEP for testing

                       1986                 Installed in Collider Hall (CEH)

                       1987                 Rolled onto SLC beamline

                       1990                 Moved off SLC beamline to east end of CEH

Mark III     1978                 Work begun on detector

                      1980                 Checkout of detector at SPEAR: 

                                                 SLAC-SP-031; (proposal)

                      1981                  Installed at SPEAR: SLAC-SP-032 experimental 

                                                 program initiated; (proposal)

                      1988                 Experimental program ends

                      1998                 Dismantling begun



Mark I detector at SPEAR
The Mark I Detector at SPEAR in 1978, with Roy Schwitters standing near its axis. This detector was used by the SLAC-LBL Collaboration to discover many new subatomic particles (LBNL)
Mark II detector at IR12
The Mark II detector at Interaction Region 12 (IR12) after the move from SPEAR to PEP (SLAC (Faust))
Mark III group photo with and on detector
The Mark III detector was the third, general-purpose detector for high-energy physics experiments at SPEAR. Staff shown with and on detector, with penguin, 07/22/1981. (SLAC)

More about Mark:

Gallery: Early Linacs (Symmetry; volume 02, issue 06; August 2005)

Search the inSPIRE HEP database by accelerator name, detector name or experiment number/name for related publications