Hodoscope Replacement for E906
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Transcript of Hodoscope Replacement for E906
Hodoscope Replacement for E906
By
Rusty Towell
December 8, 2006
December 11, 2006 Review of FNAL E906
Outline
• Why Hodoscopes• Detector description• Scintillator material• Photomultiplier tubes• Schedule• The hodoscope group
December 11, 2006 Review of FNAL E906
Hodoscopes
• Used for triggering like in E866.
• Upgrades in design• Additional planes
• More selective trigger • efficiency monitoring• redundancy
• New material (higher efficiency)• Double ended read-out (better timing needed
due to the higher rates)
December 11, 2006 Review of FNAL E906
Hodoscope Planes(approximately the same sizes, changes highlighted)
E866 E906Statio
nX (in) Y(in)
1 48 40
12x2 2x16
2 66 51
2x16
3 106 96
12x2 2x13
4 117 120
16x2 2x14
Station
X (in) Y(in)
1 48 40
16x2 2x16
2 66 51
16x2 2x16
3 106 96
none 2x16
4 117 120Two @ 16x2 2x16
December 11, 2006 Review of FNAL E906
Typical y Hodoscope Plane St 1 and 2
16 channels
x
y
2 half planes
December 11, 2006 Review of FNAL E906
Double-ended y Hodoscope Plane St 3&4
Half planes at slightly different z positions to allow for double-ended readout.
x
y
December 11, 2006 Review of FNAL E906
Scintillator Material
• Old material is:• Too small (station 1)• Too thin (station 2)• Too old/crazing
• station 2 (1989)• station 3 & 4 (1982)
• Decreased efficiencies were observed in E866.• Therefore ‘new’ scintillator material and light
guides will be used.• Material for stations 1 and 2 will come from HERMES.• New material will be purchased for stations 3 and 4.
December 11, 2006 Review of FNAL E906
Photomultiplier Tubes
• Total number of PMTs needed for E906 is 384 plus spares.
• Reuse all good PMTs from E866. Total number of tubes was 198.
• An additional 250 tubes have been committed from ZEUS when DESY is decommissioned in fall 2007.
• All tubes will be tested.
December 11, 2006 Review of FNAL E906
Hodoscope Budget
• Scintillator and light guide material: • Scintillator: EJ-200 (same as Bicron BC-408)• estimated at $120 k plus contingency and inflation
based on a 2002 quote. • Updated quote received late last week came in slightly
lower.• Total budgeted is $153 k from DOE and $ 16 k from NSF.
• Photomultiplier tubes• All pmt’s will be reused from previous experiments.• The only costs will be in shipping and testing the tubes.• Total budgeted is 2k $.
December 11, 2006 Review of FNAL E906
Schedule
• Most of the labor intensive work on the hodoscopes (especially on station 3 and 4) will be done during the summer break from classes.
• PMTs testing, design work, purchases, etc. can be done during the school year.
• There should be no problem in completing the hodoscopes on time.
• The hodoscopes could be completed earlier if the funding profile allowed for materials to be purchased sooner.
December 11, 2006 Review of FNAL E906
Hodoscope TeamUIUC & ACU
• UIUC will rebuilt stations 1 and 2.• ACU will rebuilt stations 3 and 4.• ACU rebuilt and commissioned the
hodoscopes for E789 and E866.• Testing of the PMTs will be shared.• This team can construct the
hodoscopes needed for E906.