= Time of Flight =

SVN:  http://gauss.bu.edu/svn/tof-system/

Two experiments:
* "Regular Helium Atom Scattering" (using microchannel plate) [http://ohm.bu.edu/~hazen/elbat_tof/2017/Regular%20HAS.pdf Diagram]   [http://gauss.bu.edu/svn/tof-system/Documentation/diagrams/tof_regular.png (diagram with box photos)]
* "Metastable Helium Atom Scattering" (using channeltron) [http://ohm.bu.edu/~hazen/elbat_tof/2017/Metastable%20HAS.pdf Diagram]  [http://gauss.bu.edu/svn/tof-system/Documentation/diagrams/tof_metastable.png (diagram with box photos)]

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<h3 class="foldable">Meetings</h3>
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* [[ToFPCBComments13Dec2019]]
* [[TofPCBComments05Dec2019]]
* [[TofPCBComments27Nov2019]]
* [[TofMeeting22Oct2019]]
* [[TofMeeting17Sep2019]]
* [[TofMeeting1Jun2020]]
}}}
}}}

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<h3 class="foldable">Notes on testing</h3>
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* [http://ohm.bu.edu/trac/edf/wiki/HVPulser_RevA_Testing_1_16_20 HV Pusler RevA 1/16/20]
* [http://ohm.bu.edu/trac/edf/wiki/LVMixer_RevA_Testing_1_24_20 LV Mixer RevA 1/24/20]
* [http://ohm.bu.edu/trac/edf/wiki/FilamentSupply_RevA_Testing_1_31_20 Filament Supply RevA 1/31/20] Disregard this, the wrong transistor was used during testing.
[[BR]]'''Full Testing'''[[BR]]
* [http://ohm.bu.edu/trac/edf/wiki/FilamentSupply_RevA_Testing_2_6_20 Filament Supply Full Test 2/6/20] Testing DC-Conditions
* [http://ohm.bu.edu/trac/edf/wiki/FilamentSupply_RevA_Testing_2_7_20 Filament Supply Full Test 2/7/20] Testing Pulsing
* [http://ohm.bu.edu/trac/edf/wiki/FilamentSupply_RevA_Testing_2_13_20 LV Mixer Full Test 2/13/20] Testing Mixing at Increasing Speeds
* [http://ohm.bu.edu/trac/edf/wiki/HVPulser_RevA_Testing_2_25_20 HV Pulser Full Test 2/25/20] Testing Pulsing at Increasing Speeds
* [http://ohm.bu.edu/trac/edf/wiki/PreAmp_RevA_Testing_2_27_20 PreAmp Full Test 2/27/20] Testing amplification and discrimination
[[BR]]'''RevB Testing'''[[BR]]
* [http://ohm.bu.edu/trac/edf/wiki/HV_RevB HV RevB] Testing ToF adapter RevB -> HV RevB -> Filament Supply RevB
* [http://ohm.bu.edu/trac/edf/wiki/LV_RevB LV RevB] Testing ToF adapter RevB -> LV RevB -> Filament Supply RevB
}}}
}}}

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The following boards have components and features which may need to be tuned when first assembling the system. Below are descriptions of the adjustable features on each board and relevant equations for tuning the functions of the boards.
* [http://ohm.bu.edu/trac/edf/wiki/PreAmp_Setup PreAmp Setup]
* [http://ohm.bu.edu/trac/edf/wiki/HV_Pulser_Setup HV Pulser Setup]
* [http://ohm.bu.edu/trac/edf/wiki/LV_Mixer_Setup LV Mixer Setup]
[[BR]]Other boards in this project should not need to be adjusted but relevant notes on the boards can be found below.
}}}
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* LV Mixer: [http://ohm.bu.edu/trac/edf/wiki/ELBAT_LVMixer_RevB RevB]
* HV Pulser: [http://ohm.bu.edu/trac/edf/wiki/ELBAT_HVPulser_RevB RevB]
* ToF Adapter: [http://ohm.bu.edu/trac/edf/wiki/ELBAT_ToFAdapter_RevB RevB] checked, needs fixes ESH 3/2/20
* Filament Supply: [http://ohm.bu.edu/trac/edf/wiki/ELBAT_FilamentSupply_RevB RevB] checked, ok ESH 3/2/20
* Pre-Amp: [[ELBAT_Preamp_RevA RevA]]
* Firmware: [http://ohm.bu.edu/trac/edf/wiki/ELBAT_Firmware_RevB RevB]
}}}
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Rev A boards ordered Dec 2019:

* TOF box adapter
 * Schematic: http://gauss.bu.edu/svn/tof-system/Hardware/tof/tags/RevA/adapterBoard.pdf
 * SVN: http://gauss.bu.edu/svn/tof-system/Hardware/filament/tags/RevA/
* LV pulser/mixer
 * Schematic: http://gauss.bu.edu/svn/tof-system/Hardware/lv/tags/RevA/lvMixer.pdf
 * SVN: http://gauss.bu.edu/svn/tof-system/Hardware/lv/tags/RevA/
* HV pulser
 * Schematic: http://gauss.bu.edu/svn/tof-system/Hardware/hv/tags/RevA/hvPulser.pdf
 * SVN: http://gauss.bu.edu/svn/tof-system/Hardware/hv/tags/RevA/
* Filament supply
 * Schematic: http://gauss.bu.edu/svn/tof-system/Hardware/filament/tags/RevA/Fil.pdf
 * SVN: http://gauss.bu.edu/svn/tof-system/Hardware/filament/tags/RevA/
}}}
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<h3 class="foldable">Wiring - WIP</h3>
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* DB9 - Twisted pairs
* DB15 - Twisted pairs
* BNC - 1 BNC -> open wires, X BNC -> BNC
* Minifit Jr - 2x2, 2x1
* FPGA Header - look this up
}}}
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The following boxes/instruments need to be constructed for Xuetao in 2019:

== Regular Helium ==

* TOF box (pulse output and TDC input [[NewTOFBox]]
* Filament supply (same as BU) [[NewFilamentSupply]]
* Quad PS (commercial power supplies)
* LV pulser (same as BU) [[NewLVMixer]]
* Preamplifier (need input signal specs) [[NewMCPPreamp]]

== Metastable Helium ==

* TOF box (pulse output only, no detector readout) [[NewTOFBox]]
 * Trigger signal out to TDC
* Filament PS for Exciter (? not sure) ~1A for indirectly heated cathode [[NewFilamentSupply]]
  (one fil. end is at Cathode potential)
 * Can be same supply as for regular helium e-gun, pulsed at 200V
* 200V bias supply for HV pulser
* HV pulser (Bill's design with transformers) [[NewHVPulser]]
 * Update design if needed ("high-side" FET drivers?)

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* TOF box
 * FPGA board with pseudo-random pulser and TDC; controlled via USB/serial I/F
 * Pulse input from detector preamp (also supplies preamp power)
 * 0..-25V manually adjustable supply for cathode offset (with panel meter)
* Filament supply
 * Isolated supply, 0-3A constant current (?)
* HV Pulser / Mixer
* LV Pulser / Mixer
* Preamp (MCP)
* Preamp (Channeltron)
* E-Gun power supply

On 5/30/19, Michael visited.  He says only the first 4 boxes are needed.
Xuetao will not use the Channeltron because he has a huge MCP.

For the "Regular" experiment, we use the MCP preamp and LV pulser

For the "Metastable" experiment, we use the Channeltron preamp and HV pulser

Photos (by board/box):
* http://ohm.bu.edu/~hazen/elbat_tof/Photos/

Photos (raw):
* http://gauss.bu.edu/svn/tof-system/Photos/ 
}}}
}}}