TRD chamber production

1
DUBNA
TRD chamber production

• Box
• Pad plane panel
• 2 persons
• 2 gluing table
• 1 vacuum table

• Winding
• Wires transfer
• Gluing pad plane
• panel
• 2 persons
• 4 working places

• Test
• person

TRD status meeting, 3-5 January 2005, GSI
O.Fateev
2
Time schedule of chamber production
day 1 2 3 4 5 6 7 8
work                
box gluing                
assembling and gluing side and front profiles ?              
radiator gluing (outside) ? ? ?          
radiator gluing (inside)       x        
PCB HV divider gluing         x      
PCB HV divider soldering           x    
HV cable gluing           x    
HV cable soldering and check flatness             x  
HV test               x
padplane panel                
preparation of padplanes ? x    x x    
back panel gluing (before friday)     x     x   
cutting of padplane       x      x
check pad-cable contact       x      x
TRD status meeting, 3-5 January 2005, GSI
O.Fateev
3
Mechanical tolerance

• Some problem
• box
• Bending of L-profiles runs up to 1.2 mm
• Suitable value lt200 mkm ------ 100-150
  mkm on glued box
• Torsion of wacosit front profile unusable
• Radiator flatness sometimes is not good
  especially on the corners
• Position of ledge on L-profile does not
  correspond to position of front
• profile ledge
• We should check diameter of holes in front
  profiles (use gas connector)
• Remove surplus of glue from holes during gluing
  of gas connectors into
• front profile
• Pad plane panel
• We should check a quality of cable soldering to
  the pads.
• As a result 3 glued pad plane panels (from 18)
  have a defect
• (no contact between pads and outside
  cable)

TRD status meeting, 3-5 January 2005, GSI
O.Fateev
4
PAD PLANES
TRD status meeting, 3-5 January 2005, GSI
O.Fateev
5
Clean rooms
Climate control Fan filter units
TRD status meeting, 3-5 January 2005, GSI
O.Fateev
6
Time schedule of chamber production
     1  2  3 4  5  6  7  8 9  10 11 12 
wires transferring                            
winding cathode wire planes ? ?           x   x          
measurement of cathode wires tension on the winding frames     ?  x                    
transferring cathode wires     x ? x                   
winding anode wires planes     ? ?                  
soldering and cutting cathode wires, measurement tension         ? ?                
measurement of anode wires tension on the winding frame           ? ?              
transferring anode wires             x ?            
soldering anode wires, check break off wires, additional gluing               x ?          
cutting, measuring tension of anode wires                 x x        
distance ledges gluing                   x ?      
HV test on air                     x ?    
prime glue into gap                       x ?  
HV test on air with pad plane panel                         x ?
TRD status meeting, 3-5 January 2005, GSI
O.Fateev
7
Wire transferring

• 3 microscopes are used to define right wire
  position relatively to reference hole
• precision 50 mkm
• Special pins are used for anode wire transferring
  
• Head 10 mm diameter, 3.5 mm height, 20 mkm
  precision
• Chamber is fixed to a table

TRD status meeting, 3-5 January 2005, GSI
O.Fateev
8
Wires transferring
TRD status meeting, 3-5 January 2005, GSI
O.Fateev
9
Anode wire quality
glue

• Some anode wire has bad quality
• We have lost 1 chamber, and 1 bad chamber was
  repaired ( dark current was gt500 nA when
  chamber was tested on air under 1500 V anode
  voltage)
• Do not touch anode wire during the wires
  soldering.

solder
TRD status meeting, 3-5 January 2005, GSI
O.Fateev
10
Wire tension
TRD status meeting, 3-5 January 2005, GSI
O.Fateev
11
Testing

• Gas mixture Ar/CO2
• 8 keV X-ray tube
• Movement X-ray tube by hand
• Measurement
• - dark current
• - dependence of anode current from HV
• - gain uniformity
• Anode current reads out to PC
• 3 cm pitch is used for gain uniformity
  measurement

TRD status meeting, 3-5 January 2005, GSI
O.Fateev
12
Test results
Leakage current range 0-50 nA at 1500 V anode
voltage
TRD status meeting, 3-5 January 2005, GSI
O.Fateev
13
Test results
4 clamps was installed
TRD status meeting, 3-5 January 2005, GSI
O.Fateev
14
Test of L1C04 unglued chamberhomogeneity of
radiator, gain uniformity of chamber
Additional clamps were installed (along Z)
TRD status meeting, 3-5 January 2005, GSI
O.Fateev
15
Test results
TRD status meeting, 3-5 January 2005, GSI
O.Fateev
16
Test results pad plane panel is not glued to
chamber
TRD status meeting, 3-5 January 2005, GSI
O.Fateev
17
Test results
TRD status meeting, 3-5 January 2005, GSI
O.Fateev
18
Documentation
Mechanical tolerance
Chamber ?
test information
Cathode 75 ??? Cu-Be file name
_____________ Wire tension max min average
deviation Anode 20 ??? Au-W-Re file name
_____________ Wire tension? max min average
deviation
TRD status meeting, 3-5 January 2005, GSI
O.Fateev
19

• Conclusions
• 13 chambers are ready and tested
• Gain uniformity 25-30
• 2 chambers (under transferring of anode planes)
• 4 boxes and 19 pad plane panels are ready
• Time which we intend to spend for 2 chambers
  production is 8 days
• For that we need to arrange 2 additional working
  places (for gluing pad plane panel to chamber and
  for testing)
• We need to get the materials (before April) from
  GSI/HD
• - Front and side profiles
• - Pad planes
• - Gas connectors

TRD status meeting, 3-5 January 2005, GSI
O.Fateev