XRay Scan of TQF1 and Tmm3 chambers

1

XRay Scan of TQF1 and Tmm3 chambers

2

TQF1 chamber’s difference from the usual ones• The resistive strips are NOT aligned with the read out strips.• The chamber is divided in four different regions, as seen below.• The aim is to study the chamber performance in case of displacement of

Resistive strips vs RO strips

(1) (2)

(4) (3)

HV Distribution Side

Left Side Right Side

3

• (1) Resistive strips aligned with the read out strips

• (2) Resistive strips shifted by a half pitch, w.r.t. the readout strips

• (3) Resistive strips rotated by -2°, w.r.t. the read out strips

• (4) Resistive strips rotated by 1°, w.r.t. the read out strips

In each region, the resistive strips are printed differently.

4

The angular shift in regions (3) and (4) causes the resistive strips to cross the read out strips.In region (4), the resistive strips

cross read out strips each 2.29 cm.

In region (3), the resistive strips cross the read out strips each 1.15 cm.

2°1°

5

X-Ray / MM chamber setup

MM

HV Side

RO Side

X-Ray collimator

Chamber and X-ray movements are manually controlled with possible error in positioning of about half mm

6

TQF1 Scanning conditions• The chamber was scanned using the X-Ray

gun.• To apply HV on the resistive strips and the

drift, the N71A power supply was used.X-Ray gun:HV = 14.00kVBeam intensity = 3.500mA HV-resistive strips = +470/490/520VHV-drift = -300V(monitored by power supply)

7

TQF1_Left (Standard + 1° rot)

6 7 8 9 10 11 12 13 14 15 1664.85

64.9

64.95

65

65.05

65.1

65.15

65.2

65.25

TQF1_left

X-Ray Y pos [cm]

Strip

1 cm

Standard 1° rot

8

TQF1_Left (Standard + 1° rot)

6 7 8 9 10 11 12 13 14 15 1664.85

64.9

64.95

65

65.05

65.1

65.15

65.2

65.25

X-Ray Y pos [cm]

Strip

Effect on cluster size

Y = 12 CL size 3.288

Y= 12.5 CL = 3.155Y= 13 CL = 3.17Y = 13.5 CL = 3.294

CL size = 3.2

Standard 1° rot

9

TQF1_right (1/2 pitch + 2° rot)

6 7 8 9 10 11 12 13 14 15 16207.6

207.8

208

208.2

208.4

208.6

208.8

209

209.2

209.4

209.6

TQF1_right

X-Ray Y pos [cm]

Strip

0.5 cm

10

TQF1 Cluster size ( Desy Test Beam Data)

11

Tmm3 Scanning conditions• The chamber was scanned using the X-Ray

gun.• To apply HV on the resistive strips and the

drift, the N71A power supply was used.X-Ray gun:HV = 14.00kVBeam intensity = 3.500mA HV-resistive strips = +510/550VHV-drift = -300V(monitored by power supply)

12

Tmm3

6 7 8 9 10 11 12 13 14251

252

253

254

255

256

257

258

Tmm3

X-Ray Y pos [cm]

Strip

13

Summary

• TQF1 response with X-Ray has been studied• A small effect on reconstructed position has been

observed comparing 1° rot area Vs standard area and 2° rot Vs half pitch shifted

• No easy way to compare the half pitch Vs standard area.

• Similar small effect has been found also on the cluster size.