Muon Monitor Working Team

Note: the original document by Katsuya is on Google Docs along with the other relevant documents that were moved here:, relevant people have edit access it if need be. However, moving forward it would be better to make all the changes directly to this Wiki page if possible.


Pavel (Leader), Yiding, Amit, Athula, and Katsuya
Jim, Tyler, Laura, and Bob as consultants


Maintain the quality of muon monitor signal within a +/- 1 % systematic error.
Establish beam profile and MM signal correlation, use it to mitigate beam issues.


  • Take safety classes (All)
    • Rad worker & Practical training
    • Controlled access
    • LOTO II
    • Underground training
    • Who is ITNA for the visitors? (Peter Shanahan for Yiding and Pavel)
  • Study Ion Chamber (Katsuya)
    • Katsuya to arrange for a presentation on the topic as discussed on Wed, Feb 27, 2019
    • Understand physics process
    • Understand electronics
  • Maintain data (Athula)
    • Define our standard computer language (C++, Java, Python, etc?)
    • Define file format (ascii, binary, ntuple, etc?)
    • Define data structure (header file, time format, time length, etc)
    • Make a common storage area (Pavel)
  • Muon monitor simulation (Yiding)
    • Study a correlation between beam profile and muon monitor signal
      • Beam angle
      • Beam spot size
      • Horn current
      • Target deterioration
    • Simulate space charge in ion chamber
  • Test spare ion chamber (???)
    • Calibrate signal

Zoom meeting ID:

Muon Monitor group meetings

Documentation for the Hadron and Muon Monitors

ChannelMapping.pdf - There are several different indices for the hadron and muon monitor electronics and physical chamber locations, i.e. Channel (software and hardware), Row, Column, Pixel, SWIC plane (V or H), SWIC wire (1-96), Acnet Index (104-199), Tube (muon monitors only), and Used vs Unused Channels. This document describes in detail the mapping of all of these labels to one another.

DeadChannels.pdf - This file shows the physical location and software channel of any dead chambers of the hadron and muon monitors. It contains the date that it was last updated. It requires another update since I recently discovered that there appears to be another dead chamber in Muon Monitor 1.

HadMuMonACNETDevices.pdf - The daq for the hadron and muon monitors and all related devices, e.g. pressure sensors, etc, is read out through ACNET. This document describes in detail, all of the existing devices, their trigger settings and any corrections that are applied to a device.

HadMuMonHighVoltage.pdf - This document describe in detail, both pictorially and in words how to reset/turn on the hadron and muon monitor high voltage. In describing this it also documents the number of HV channels that exist for each monitor and which monitor chambers each HV channel is physically connected to.

HadMuMonSWICSCANNERS.pdf - The DAQ for the hadron and muon monitors are SWIC Scanners (i.e. they are fermilab designed to read out SWIC devices but have been modified to read out each chamber of each hadron and muon monitor). The SWICS are all connected through the Front End Electronics. This document describes pictorially and in words how to reset the scanners if necessary and also provides information about trigger settings.

HadMuMonSignalDiagnostics.pdf - This document is a guide for analysing the total signal from the hadron and muon monitors. It focuses primarily on helium gas contamination, pictorially describing how to recognise gas contamination and the reasons for such contamination. It also briefly describes Horn Current Scans; how to visually analyise them and also provides the typical Signal in each monitor for each beam configuration. This is helpful in diagnosing problems with the horn, e.g. if the beam is in LE010z185i but the muon monitor signals are closer to that of 0kA, then there is potentially a problem with the horn(s).

BeamScanFY19.pdf - This document shows the result of beam scan for FY19.

BPMandMuonMonitorFY19.pdf - This document shows the observed correlation between the beam position on BPM and Muon Monitor.

Relevant links

Wiki pages created by Tyler:
Muon Monitor Simulations - details on how to extract data from ifdb/acnet
ACNET Variables - detailed list of relevant ACNET variables with description, units of measure, and calibration formulas
Muon Monitors g4numi - extracting MM data from g4numi simulations


Mostly hardware references, but also discussion of signal performance. However, some of this information is out dated, please refer to the above documents for more up-to-date information on the hardware/electronics and Minerva-doc-6944 for more up-to-date information on signal response/analysis.
  1. Robert Miles Zwaska, "Accelerator systems and instrumentation for the NuMI neutrino beam", Ph.D. Thesis, The University of Texas at Austin, 2005. Fermilab Thesis Server, BZwaska-Thesis.pdf
  2. Dharmaraj Indurthy, "Secondary beam monitors for the NuMI facility at FNAL", Masters Thesis, The University of Texas at Austin, 2006. UTAustin Library
  3. Kopp, S. et. al., "Secondary beam monitors for the NuMI facility at FNAL", Nucl. Instrum. Meth., A 568, 503-519, 2006. Also on the Fermilab Publication Server.
  4. Zwaska, R. et. al., "Beam-based alignment of the NuMI target station components at FNAL", Nucl. Instrum. Meth. A 568, 548-560, 2006. Also on the Fermilab Publication Server.
  5. Zwaska, Robert M. et al., "Operation of the NuMI beam monitoring system", AIP Conf. Proc.", 868, 558-565, 2006. Fermilab Publication Server