ucb update - university of chicago · 2012-01-21 · 33mm photocathode update • new photocathode...

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UCB Update Jason McPhate 30 March 2010

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Page 1: UCB Update - University of Chicago · 2012-01-21 · 33mm Photocathode Update • New photocathode materials have arrived from SAES (K, Na, Cs) • 33mm disks from B270 should be

UCB Update 

Jason McPhate 

30 March 2010 

Page 2: UCB Update - University of Chicago · 2012-01-21 · 33mm Photocathode Update • New photocathode materials have arrived from SAES (K, Na, Cs) • 33mm disks from B270 should be

33mm Photocathode Update 

•  New photocathode materials have arrived from SAES (K, Na, Cs) 

•  33mm disks from B270 should be here (big backlog in receiving aJer UC furlough) 

•  33mm disks of B33 (polished) and fused silica in hand 

•  Clean windows and metalize •  Ready to assemble forming well •  Load into tank and shoot some cathodes 

30 March 2010  J. McPhate – UCB Update  2 

Page 3: UCB Update - University of Chicago · 2012-01-21 · 33mm Photocathode Update • New photocathode materials have arrived from SAES (K, Na, Cs) • 33mm disks from B270 should be

FaciliRes Update 

•  Double barrel chamber now fully commissioned –  Dedicated scroll backing pump finally arrived 

•  “eBay” chamber has arrived –  Damaged in shipping 

•  Phosphor screen detector in fabricaRon –  AwaiRng phosphor screens from Photonis –  FabricaRng two assembly version (in the shop) 

•  2X with PEEK insulators for double barrel chamber work •  1X with Vespel insulators for life tesRng (higher temp capability) 

•  2X Vespel‐based 33mm demountable bodies (in the shop) –  One for XDL detector, one for phosphor screen  ‐ Life Test Setups 

30 March 2010  J. McPhate – UCB Update  3 

Page 4: UCB Update - University of Chicago · 2012-01-21 · 33mm Photocathode Update • New photocathode materials have arrived from SAES (K, Na, Cs) • 33mm disks from B270 should be

eBay Chamber 

30 March 2010  J. McPhate – UCB Update  4 

• “Door” to be used as 220mm seal test and cathode shoot test chamber 

• Remaining, bulk of chamber to be used for vacuum storage of MCPs 

• Damaged flange on “door” will be replaced 

Page 5: UCB Update - University of Chicago · 2012-01-21 · 33mm Photocathode Update • New photocathode materials have arrived from SAES (K, Na, Cs) • 33mm disks from B270 should be

33mm Phosphor Screen Detector 

THIRD ANGLE PROJECTION

4 3 2 1 5 6 4 11 12 137 8 9 10 14

ITEM PART NUMBER DESCRIPTION QTY/ASSY

1 EAG-LAPP-032LAPP 33mm Phosphor Demountable - 4.5" CF & SHV Weld Assy

1

2 EAG-LAPP-001Argon 33mm MCP Demountable - Assembly

1

3 EAG-LAPP-031LAPP 33mm Phosphor Demountable - Detector Clamp

1

4 M2.5 x 4 FHMS M2.5 x 4 Flat Head Machine Screw 125 2-033 Viton Oring 1

6 EAG-LAPP-02833mm Phosphor Screen Detector - Screen Insulator

1

7 2-031 Viton Oring 1

8 phosphor screen Photonis 29mm phosphor screen assembly 1

9 EAG-LAPP-029LAPP 33mm Phosphor Detector - Screen Adapter Plate

1

10 M2.5 x 5 SHCS M2.5 x 5 Socket Head Cap Screw 6

11 EAG-LAPP-034LAPP 33mm Phosphor Demountable - HV Shield with Reynolds 600

1

12 M3 x 8 FHMS M3 x 8 Flat Head Machine Screw 413 5/16 - 24 bolt 12 Point Bolt - 5/16-24 - silver plated 814 washer Narrow Flange Washer - 5/16" 8

D

C

B

AA

B

C

D

12345678

8 7 6 5 4 3 2 1

DIMENSIONS ARE IN INCHES

TOLERANCES:

ANGULAR: MACH 2 BEND 4

ONE PLACE DECIMAL .05

TWO PLACE DECIMAL .01

THREE PLACE DECIMAL .002

FOUR PLACE DECIMAL .0005

INTERPRET GEOMETRIC

TOLERANCING PER:

MATERIAL

FINISH

DRAWN

CHECKED

ENG APPR.

Q.A.

PROJECT:

DATENAMEExperimental Astrophysics Group

TITLE:

SIZE

BDWG. NO. REV

WEIGHT: SCALE: 1:1

UNLESS OTHERWISE SPECIFIED:

JBM 1/14/2010

SHEET 1 OF 1

EAG-LAPP-026DO NOT SCALE DRAWING

-

33mm PhosphorDemuont AssemblyLAPP

30 March 2010  J. McPhate – UCB Update  5 

Page 6: UCB Update - University of Chicago · 2012-01-21 · 33mm Photocathode Update • New photocathode materials have arrived from SAES (K, Na, Cs) • 33mm disks from B270 should be

33mm Phosphor Screen Detector 

30 March 2010  J. McPhate – UCB Update  6 

Page 7: UCB Update - University of Chicago · 2012-01-21 · 33mm Photocathode Update • New photocathode materials have arrived from SAES (K, Na, Cs) • 33mm disks from B270 should be

6mm Rear Field Spacer (Frog) 

30 March 2010  J. McPhate – UCB Update  7 

We are leaning toward a 6mm rear field gap 

• Allows charge cloud spreading over sufficient strips to reduce DNL on charge centroid. 

• Similar gap to Planacon and many other convenRonal paberned anode tubes. 

• Any adverse effect on TTS can be ameliorated by using 2‐d end spoiling on bobom (eliminate low energy, transverse e‐ from cloud). 

• We believe this will actually be similar to 3mm rear field gap for TTS, with sufficient field. 

Page 8: UCB Update - University of Chicago · 2012-01-21 · 33mm Photocathode Update • New photocathode materials have arrived from SAES (K, Na, Cs) • 33mm disks from B270 should be

220mm Tube Update 

•  Quote for ceramic walls at a quanRty of 10.  $1125 each. –  RequesRng quote for larger quanRRes (20, 100, 1000, …) in thickness for 3mm and 6mm rear 

field gaps –  Expect cost to go down, but not sure how much.  Should receive quotes in the next day or 

two. 

•  Quote for machined Kovar indium cup (no Ni sinter and Cu plate) –  QuanRty 10: $667 each! –  Ni/Cu plaRng will only add to this cost –  Hence pursuing stamped copper version of indium cup 

•  Quote for stamped OFHC copper indium cups –  Compound die (one step cut and form) 

•  NRE Tooling cost: $8450  •  Minimum order quanRty of 100:  $12.65 each 

–  Secondary tooling (two step process; cut, form)  •  NRE Tooling cost: $4200 •  Minimum order quanRty of 100: $22.40 each 

–  Leaning toward compound die method as vendor is more certain of good product. 

30 March 2010  J. McPhate – UCB Update  8