Hohlmann, Marcus

Physics and Space Sciences

Dr. Hohlmann researches elementary particles and their interactions at the highest energies that can be achieved in the laboratory. His work centers on the study of high energy particle collisions at large accelerators and the construction of instrumentation, i.e. particle detectors, needed to carry out those studies. Currently he pursues this research with the CMS experiment at the Large Hadron Collider at CERN in Geneva, Switzerland. In the past, he worked at the Tevatron collider of the Fermi National Accelerator Lab (Fermilab), where he contributed to the discovery and study of the sixth and heaviest quark, the top quark, and at the HERA accelerator at DESY, where he helped to build a large tracking detector for the HERA-B experiment designed to study CP violation with bottom quarks.

With his students, Dr. Hohlmann also builds and operates advanced gaseous particle detectors, such as GEM detectors for future nuclear physics experiments at an electron-ion collider to be built in the U.S. and for muon tomography of nuclear contraband as a Homeland Security application. He constructed and operates Fl. Tech's only Grid Computing Cluster, which is an official Tier-3 site on the Open Science Grid.

Personal Overview

Dr. Hohlmann is a charter member of the RD51 collaboration at CERN, which is dedicated to developing Micro-Pattern Gaseous Detectors (MPGDs) for particle detection. He is Florida Tech's RD51 team leader and serves on the RD51 collaboration board.

He serves as Florida Tech's representative on the Institution Board of the CMS Muon Detector Group.

Dr. Hohlmann co-founded Florida Tech's QuarkNet Center, which organizes HEP-related outreach activities for high school physics teachers and students, in 2002 and was the center's director from 2004-08.

At Florida Tech he serves as a representative of the College of Science to the Academic Computing and Information Technology Committee (ACITC) and as faculty advisor to the local Chapters of the Society of Physics Students (SPS), the student organization of the American Institute of Physics, and the Sigma Pi Sigma Physics Honor Society.

He also advises the Badminton Club and used to pitch for the P/SS Department's Intramural Softball Team - the "InfraRed Sox".

Educational Background

Ph.D., University of Chicago, 1997.
Dipl. Phys., RWTH Aachen, Germany, 1991.
M.S., Purdue University, 1989.

Recognition & Awards

  • FIT 'Excellence in Research' Award 2010/11
  • 'Most Valuable Panther' Award 2012

Current Courses

  • PHY 5045 Introduction to Elementary Particle Phys. (Grad.)
  • PHY 5030/5031 Quantum Mechanics I & II (Grad.)
  • PHY 4071 Senior Laboratory
  • PHY 4030 Introduction to Subatomic Physics
  • PHY 3901 Research Experience in Physics
  • PHY 2002 Physics 2
  • PHY 1001 Physics 1

Professional Experience


Associate Prof., Florida Inst. of Tech., 2007-2015.

Assistant Prof., Florida Inst. of Tech., 2002-2007.

Postdoctoral Research Fellow, HERA-B Experiment, Deutsches Elektronensynchrotron (DESY), Hamburg, Germany, 1997-2001.

Graduate Research Assistant, CDF group, Univ. of Chicago, 1994-1997.

Graduate Student Research Associate, CDF Experiment, HEP Division, Argonne National Laboratory (ANL), Argonne, IL, 1991-1994.

Current Research

Dr. Hohlmann has contributed to the construction of the CMS detector at the Large Hadron Collider (LHC) at CERN, the European Center for Particle Physics, in Geneva, Switzerland. With his research group at Florida Tech, he calibrated and commissioned an alignment system for the CMS experiment for monitoring the exact positions of the Endcap Muon System using a variety of analog and optical sensors. Using data from the system Hohlmann's students have aligned muon chambers of the CMS experiment to sub-millimeter accuracy.

Since the turn-on of the CMS detector in 2009, he conducts searches for new particles such as the new gauge boson, Z', with his graduate students.

Dr. Hohlmann also researches advanced gaseous particle detectors, such as GEM detectors for muon tomography of nuclear contraband as Homeland Security application and for an upgrade of the forward muon system of CMS.

With his students he has constructed and operates Florida Tech's most powerful computing cluster with over 180 CPU cores and about 100 TB of data storage that is used for detailed simulations of these detectors using the GEANT4 simulation toolkit. The same cluster also serves as an official Tier-3 production site on the Open Science Grid. In June 2010, the site was reported as the world's largest Tier-3 site used by the CMS experiment.

Selected Publications

(Full publication list)

Hohlmann, M. with Gnanvo, K., et al., Imaging of high-Z Material for Nuclear Contraband Detection with a Minimal Prototype of a Muon Tomography Station Based on GEM Detectors, Proc. Symp. On Radiat. Meas. and Appl. (SORMA10), Ann Arbor, MI, Nucl. Instr. and Meth. A, article in press, 2011.

Hohlmann M. with K. Gnanvo, et al., Detection and Imaging of High-Z Materials with a Muon Tomography Station Using GEM Detectors, Proc. of IEEE Nucl. Sci. Symp. 2010, Knoxville, TN, 2010.

Hohlmann, M. with D. Abbaneo, et. al., Construction of the First Full-Size GEM-Based Prototype for the CMS High-Eta Muon System, RD51-Note-2010-008, Proc. of IEEE Nucl. Sci. Symp. 2010, Knoxville, TN, 2010.

Hohlmann, M. with D. Abbaneo, et. al., Characterization of GEM Detectors for Application in the CMS Muon Detection System, RD51-Note- 2010-005, Proc. of IEEE Nucl. Sci. Symp. 2010, Knoxville, TN, 2010.

Hohlmann, M., Guragain, S., and Gomez, G. with the CMS Collab., Aligning the CMS Muon Chambers with the Muon Alignment System during an Extended Cosmic Ray Run, J. Inst. 5:T03019, 2010.

Hohlmann, M., et al., Design and Construction of a First Prototype Muon Tomography System with GEM Detectors for the Detection of Nuclear Contraband, arXiv 0911.3203, Proc. IEEE Nuclear Science Symposium, Orlando, FL, ISBN 978-1-4244-3962-1, 2009.

Hohlmann, M., et al., GEANT4 Simulation of a Cosmic Ray Muon Tomography System with Micro-Pattern Gas Detectors for the Detection of High-Z Materials, IEEE Trans. Nucl. Sci. 56, 2009.

Hohlmann, M. with Gnanvo, K., et al., Performance Expectations for a Tomography System Using Cosmic Ray Muons and Micro Pattern Gas Detectors for the Detection of Nuclear Contraband, arXiv: 0812.1007, Proc., IEEE Nucl. Sci. Symp., Dresden, Germany, ISBN 978-1-4244-2715-4, 2008.

Hohlmann, M. with the CMS Collab., The CMS Experiment at the CERN LHC, J. Inst. 3, S08004, 2008.

Hohlmann, M., et al., Aligning the CMS Muon Endcap Detector with a System of Optical Sensors, Proc., IEEE Nuclear Science Symposium, Honolulu, ISBN1-4244-0923-3, 2007, and CERN-CMS-CR-2008-015.

Hohlmann, M., G. Baksay (Ph.D. stud.) with P. Achard et al. (L3 coll.), Measurement of the photon structure function F2γ with the L3 detector at LEP, Phys.Lett. B622, 2005 (based on Fl. Tech Ph.D. thesis).

Hohlmann, M., C. Padilla, N. Tesch and M. Titov, editors, Proc. of International Workshop on Aging Phenomena in Gaseous Detectors, Nucl. Instr. and Meth. A515, 2003.

Hohlmann, M., A large ultra-clean gas system with closed loop for the high-rate Outer Tracker at HERA-B, Nucl. Instr. and Meth. A515, 2003.

Hohlmann, M., Final remarks - Do we need a Global Universal Aging Research & Development (GUARD) facility?, Nucl. Instr. and Meth. A515, 2003.

Hohlmann, M. with H. Albrecht, et al., Aging Studies for the large honeycomb drift tube system of the Outer Tracker of HERA-B, Nucl. Instr. and Meth. A515, 2003.

Hohlmann, M. with T. Affolder, et al. (CDF Coll.), Search for the Charged Higgs Boson in the Decays of Top Quark Pairs in the eτ and μτ Channels at √s = 1.8 TeV, Phys. Rev. D 62, 2000.

Hohlmann, M., with F. Abe, et al. (CDF Coll.), The μτ and eτ decays of top quark pairs produced in p anti-p collisions at √s = 1.8 TeV, Phys.Rev.Lett.79, 1997.