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SNS Fast Beam Loss Monitors Final Design Review. David M. Gassner. BLM System Design Features. Ion Chambers: Wide Dynamic Range (IC 6 Decades) ( 2 dn, 4 up) Gain adjustment (per channel) Beam intensities Detector shielding. Response Time Ion Chamber

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sns fast beam loss monitors final design review

SNS Fast Beam Loss Monitors Final Design Review

David M. Gassner

SNS Beam Loss Monitor

blm system design features
BLM System Design Features

Ion Chambers:

  • Wide Dynamic Range (IC 6 Decades) (2 dn, 4 up)
  • Gain adjustment (per channel)
    • Beam intensities
    • Detector shielding
  • Response Time
    • Ion Chamber
      • Micro-second response. Data can be available for multi-turn, per cycle, and per second intervals.
    • Order of 5-10 turns to generate Permit Link Fail(35 KHz BW = 10us)
    • FBLM, Liquid Cell/ PMT
      • Fast (ns), within turn loss data
      • Wide dynamic range
  • FBLM Test
    • LED mounted inside Scintillator/PMT assembly
    • Can be pulsed remotely

SNS Beam Loss Monitor

blm distribution
BLM Distribution

Total 18 FBLM’s

SNS Beam Loss Monitor

hebt loss monitors
HEBT Loss Monitors

169 meters

BLM LocationQuantity

Quads 37

Collimator 2

Cavities 2

Dump 2

BIG 1

Moveable 8

FBLM LocationQuantity

Upstream 1

Bend 1

Dump 1

SNS Beam Loss Monitor

ring loss monitors
Ring Loss Monitors

248 meter circumference

BLM LocationQuantity

Quad 44

Injection 7

Collimators 7

RF 5

Extraction 5

Moveable 7

FBLM LocationQuantity

Injection 2

Straight Sec. End 4

Bends 4

Extraction 2

SNS Beam Loss Monitor

rtbt loss monitors
RTBT Loss Monitors

150 meters

BLM LocationQuantity

Quads 27

Collimators 4

Dump 2

Target 3

Moveable 4

FBLM LocationQuantity

Extraction 1

Collimators 1

Target area 1

SNS Beam Loss Monitor

liquid cell photo multiplier loss monitor
Liquid Cell/Photo-Multiplier Loss Monitor

Detector

  • Available commercially from Bicron, Model MAB.
  • BC-505 Liquid (1,2,4 Trimethybenzene)
    • More Rad hard than plastics, (about 10X’s)
    • Highest light output of any liquid (80% anthracene)
    • Excellent light transmission (2.5m, min 1/e attenuation)
    • High Flash point (48oC, 118oF)
  • PMT - Hamamatsu 2060, 10 stage.
  • Sensitivity on order of 100uC/R, Relative to itself.

SNS Beam Loss Monitor

loss signals
Loss Signals
  • Fast Loss Monitor Applications
    • Fast instabilities
    • Kicker errors
    • Momentum errors
    • Beam in Gap
    • Ring wire scanner data
  • Two Modes
    • Integrated signal over bunch duration, read out via digitizer clocked revolution frequency.
    • Losses within bunch. Signals buffered and sent through wideband mux to fast digitizer (1 GS/s).

SNS Beam Loss Monitor

data acquisition control
Data Acquisition & Control

Buffer Electronics:

  • Wideband amp, drives two outputs.

Loss Data:

  • All channels digitized through standard 60 MS/s 14 bit ADC.
  • Selected channels at 1 GS/s via mux, (Example: LeCroy 374 Scope)
  • Data transferred to high level via Channel Access.

Multiplexer for 1 GS/s:

Keithley

      • 7001 High Density Switch system
      • 7016A 50 Ohm, Dual 1X4, 2 GHz Mux cards

LED Test Pulse

  • Remote control
  • Timing

HV Bias Control

  • EPIC’s Driver to ISEG VME based Bias Supply

SNS Beam Loss Monitor

hv bias
HV Bias

ISEG HV Bias Supply

  • VME High Voltage Power Supplies in 2 slot width
  • 1 channel and 2 channel versions in same dimensions
  • LCD display for voltage or current
  • variable rate of change of output voltage
  • switched polarity
  • integrated protection and control circuits
  • output overload and short circuit protected
  • SHV connector on front side
  • Full control via VMEbus
  • EPIC’s drivers
  • $1.2k/channel
  • Model VHQ 202M, 0-2kV, 3mA

SNS Beam Loss Monitor

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