Radmon

1
Overview radiation monitoring and Beam abort
system DØ SMT
Tevatron Beam abort
PCI VME
Receiver cards
ADC
Flex cable Through CF cylinder
Hirose connector
Horse Shoe Patch area
Round cable Special 2-3m
Round cable standard 40 m
BNC cable 40 m
Receiver Electronics crate
BLM (muon shield x8)
PC
D0 Control and monitoring
Radmon Sensor (F-disk x12 H-disk x12) 100
mW/module
Ethernet
Group responsible Univ. of Nijmegen, NL
2
What is to be monitored

• ? Instantaneous radiation levels
• ? at millisecond time scales
• ? at seconds time scale
• ? at minutes time scale
• ? at days/months/years time scale
• ? Sensitivity
• ? rad/hour (long term)
• ? rad/second (short term/bursts)

DØ, PMG, August 17,2000 H.Weerts
3
Part I a la CDF

• CDF already has a monitor and beam abort system
• ? Beam Loss Monitors (BLMs)
• ? 1 Atm. Ar filled glass/Al tubes
• Current ? Radiation / low sensitivity
• ? TLDs infrequent access at long intervals
• Used to gauge the BLMs a posteriori
• Will use same system in RUN II, but at larger z
  distance

DØ, PMG, August 17,2000 H.Weerts
4
Part I CDF?DØ

• BLM proven to be reliable, Beams division trusts
  them use them also for DØ
• Bulky use at large z distance, 4 on each side of
  DØ

I.P.
DØ, PMG, August 17,2000 H.Weerts
5
Part II from OPAL

• All 4 LEP experiments have good radiation
  monitoring and beam abort systems, the OPAL
  system is used as inspiration for DØ.
• Principle 0.7x0.7 cm2 Si diode current ?
  radiation
• Two gain ranges (a la OPAL) to accommodate high
  sensitivity fast measurement and lower
  sensitivity long term integral measurement
• Maintain fast signals to the external electronics

DØ, PMG, August 17,2000 H.Weerts
6

• Location of the sensors in DØ
• F-disk
  H-disk

6 sensors at each location
DØ, PMG, August 17,2000 H.Weerts
7
Si diodes sensor module prototype
Correct dimensions for F-disk 2 layouts
tested (one better than other choice
made) Design allows to cover with EM shielding
foil
DØ, PMG, August 17,2000 H.Weerts
8
Current status
BLM system Si diodes
Have BLMs at FNAL Have 48 with guard/ 48 without in NL
Install during shutdown in September Some sensors to be shipped next week from NL
Cables on order arrive in next two weeks ?same
HV use DØ system Needs to be understood
DAQ/readout through BD system feedback to DØ for monitoring Prototype readout exist in NL, not at FNAL yet. Shipped in coming weeks.
Mounts to be decided next week ? same
Ready for commissioning run Install during shutdown readout may not be available at start ( outside hall)
People working on this at FNAL D.Wijngaarden,
S.Duensing (Nijmegen) K. Gounder (BD)