Fundamental Technologies

Cassini MIMI Pages

Fax to E. Kirsch, S. Livi, B. Wilkin, and D. Mitchell, from T. Armstrong, 11/17/92

Program calculation of ion responses for your proposed MIMI 180 end detectors. I can easily adjust the logic, thicknesses, thresholds, etc. Please check that this is what you intended. I may have misread. Let me know what next.

Kirsch Proposal for MIMI 180 End, as of Sept. 29-Oct. 1 Team Meeting at CESR:

ABSORBER NAME Foil D1 D2 D3 Brass C B
ABSORBER THICKNESSES, MICRONS 100.0 300.0 5000.0 300.0 2860.0 500.0 985.0
ABSORBER MATERIAL ALUM. SILICON SILICON SILICON NICKEL SILICON SILICON
THICKNESS VARIATION, MICRONS 0.0 10.0 0.0 10.0 0.0 10.0 10.0
CONICAL HALF ANGLE, DEGREES 22.5 22.5 22.5 22.5 22.5 22.5 22.5
DETECTOR NOISE, MEV 0.0 0.015 0.0  0.015 0.0 0.010 0.010
ELECTRONIC NOISE, MEV 0.0 0.0 0.0 0.0 0.0 0.0 0.0
NUMBER OF THRESHOLDS SET 0.0 5.0 5.0 1.0 0.0 2.0 3.0
THRESHOLD LEVEL NO. MEV    1 0.0 0.025
D11
0.026
D21
0.025
D31
0.0 0.025
C1
0.100
B1
THRESHOLD LEVEL NO. MEV    2 0.0 0.110
D12
0.200
D2X
0.0 0.0 0.200
C2
1.000
B2
THRESHOLD LEVEL NO. MEV    3 0.0 0.200
D13
1.900
D22
0.0 0.0 0.0 10.00
B3
THRESHOLD LEVEL NO. MEV    4 0.0 7.500
D14
35.00
D23
0.0 0.0 0.0 0.0
THRESHOLD LEVEL NO. MEV    5 0.0 30.00
D15
150.0
D24
0.0 0.0 0.0 0.0
AVERAGE PROJECTED DEPTH, MIC 104.0 311.9 5197.8 311.9 2973.2 519.8 1024.0
EST.RMS VARN.PROJ.DEPTH, MIC 4.1 12.4 206.0 12.4 117.8 20.6 40.6
NET RMS THICKNESS VARN. (MIC) 4.1 15.9 206.0 15.9 117.8 22.9 41.8
LOWER LIMIT THICKNESS (MIC) 99.8 296.0 4991.8 296.0 2855.3 496.9 982.2
UPPER LIMIT THICKNESS (MIC) 108.1 327.8 5403.8 327.8 3091.0 542.7 1065.8


Fax reply from E. Kirsch, 12/9/92

I thank you very much for the program calculations concerning the LEMMS high energy detector. In the meantime I have improved the design and discussed it also with B. Wilken and S. Livi.

Could you please run the program once more for the new logic and the absorber and discriminator thresholds which I have listed separately.

Thank you very much.

LEMMS B-C-D Detectors

1. Electrons and X-rays

D11 D12 D21 D2x = e- = 375 - 550 keV
D11 D12 D2x D22 = e- = 0.550 - 2.25 MeV
D11 D12 D22 D23 D31= e- = 2.25 - 3.85 MeV
D11 D12 D21 D31 C11 B11 = 7.5 - 19.65 MeV
D11 D12 D21 = e-, X = 25 - 200 keV = single rate D11
S = 5 channels

2. Protons and X-rays

D11 D13 D21 D22 = 7 - 8.9 MeV    p
D11 D13 D22 D23 D31 = 8.9 - 35 MeV   p
D11 D13 D31 C11  = 35 - 60 MeV   p
D11 D13 D21 C11 B11 = 55 - 100 MeV   p
D11 D13 D21 D31 C12 = 55 - 500 MeV   p
D11 D21 D22 D31 = X = 25 - 200 keV    X = single rate D21
S = 6 channels

3. a Particles

D13 D14 D21 D23 = a = 28 - 63 MeV 
D13 D14 D23 D31 = a = 63 - 130 MeV 
D13 D14 D31 C11 = a = 130 - 230 MeV 
S = 3 channels

4. Z>= 3-Particles

D14 D21 D23   ~=  35 - 70 MeV 
D14 D21 D23   ~=  70 - 140 MeV
S = 2 channels

5. Single rates D31, C11

Total: 18 channels

Discriminator Thresholds

D11 = 0.025 MeV D21 = 0.025 MeV D31 = 0.025 MeV
D12 = 0.2 MeV D2x = 0.2 MeV C11 = 0.025 MeV
D13 = 7.5 MeV D22 = 2.0 MeV C12 = 0.25 MeV
D14 = 30 MeV D23 = 35 MeV B11 = 0.025 MeV

Absorber 1 = 100m Al
Absorber 2 = 300m Si     Detector D1
Absorber 3 = 5000m Si     Detector D2
Absorber 4 = 300m Si    Detector D3
Absorber 5 = 3000m brass
Absorber 6 = 500m Si    Detector C1
Absorber 7 = 3000m  Pt
Absorber 8 = 1000m Si    Detector B1

rPt=21.45 g/cm3
rAu=19.32 g/cm
t=3000m     Pt =3000 (21.45/19.32) Au
                      =3307m Au

100m = 100 x 10-4 cm = 0.01 cm

.3 cm Brass = 2.55 g/cm2 [8.5 g/cm2=r]

Nickel = 8.9 g/cm3
t = 2.55 g/cm2 / 8.9 g/cm3 = .286 cm

Additional Figures

Return to Historical MIMI Notes and Memos main page.
Return to Cassini MIMI table of contents page.
Return to Fundamental Technologies Home Page.

Updated 6/9/08, T. Hunt-Ward
tizby@ftecs.com
Figure reconstruction by T. Manweiler.