w. ebensteindoe annual review duke universityseptember, 1998 trt barrel cooling: electronics ...

W. Ebenstein DOE annual review Duke University September, 1998

Title: (AIATL_LOGO2.eps)Creator: Adobe Illustrator(r) 6.0CreationDate: (4/3/97) (11:26 AM) TRT Barrel Cooling:

Electronics Motivation:

Overheating of electronics causes premature failure

Requirements: 60 mW per channel Total for type 1(inner) module ~ 20 W Want operating T < 50 ºC

Cooling Plan: Heat generated by IC through stamp board/banding through legs/sockets into cooling plate to mounting channel/tubing to cooling fluid


Title: (AIATL_LOGO2.eps)Creator: Adobe Illustrator(r) 6.0CreationDate: (4/3/97) (11:26 AM)

Current Duke Prototype: Aluminum cooling plate/tubing tension plate insulated box additional sensors/readout



From Lund: ASDBLR & DTMROC dummy boards

(pictured here) Roof boards Readout and display software



Results of tests: (coolant at 14 ºC) 1.3 mm cooling plate + all sockets:

ASDBLR: 46 ºC DTMROC: 48 ºC roof boards: 38 ºC cooling, tension plates: ~ 27 ºC

(Typical range: ± 2 ºC)



Remaining issues/improvements: Mass production of tubing Attachment of tubing/channel Heat transfer banding/legs/sockets Replacement of aluminum cooling

plate by pyrolytic graphite (PG): Motivation: Need to reduce

material to get acceptable radiation length



Properties of PG material: Made by pyrolysis of hydrocarbon

gases in a vacuum furnace Thermal conductivity(in-plane):

PG ~ 400 W/m-K compare: Cu ~ 400, Al ~ 200

Expensive ~ $150k for barrel (PG) ~ $ 50k with aluminum

Machinability / gluing? We are exploring


Title: (AIATL_LOGO2.eps)Creator: Adobe Illustrator(r) 6.0CreationDate: (4/3/97) (11:26 AM) TRT Barrel Cooling:

Module Motivation:

Uniform temperature needed inside module for optimum TR function

Requirements: Type 1 module heating is ~ 7.5 Watts Want T gradient < 7 ºC

Cooling Plan: Cooling fluid (same as electronics

cooling) flows in tubing running full length of module

Tubing makes good contact inside shell at two opposite corners

Shell has good thermal conductivity (50-100 W/m-K)



Calculation by BNL: T = 8.6 ºC



Duke experimental studies: Put real module in insulated box Heat module with current through

straws Flow cooling water at 24 ºC Measure T with small thermistors

inside module and attached to outside of shell



Module cooling test chamber:



Results of experiments: T ~ 10 ºC

Title:From AutoCAD Drawing "C:\WLE\COOLING\TEMPS"Creator:AutoCADPreview:This EPS picture was not savedwith a preview included in it.Comment:This EPS picture will print to aPostScript printer, but not toother types of printers.

w. ebensteindoe annual review duke universityseptember, 1998 trt barrel cooling: electronics ...

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