Vendors for parts
Ionization Chamber material
Modern Plastics
Source of Ertalyt and G10/FR4 plastic sheets
Address: 676 Howard Ave, Bridgeport, CT, 06605-0574
Phone: (203) 333-3128 / (800) 243-9696
sales reps: Vicky Rivera vrivera@modernplastics.com
Some previously used materials:
Ertalyte, PET NAT PET-P Plate natural
G10/FR4
Rohacell
was a company at Degussa.com
now it is called evonik http://www.evonik.com/en/index.html
http://www.rohacell.com/en/performanceplastics8344.html
Phone # 870 234 0286
The rohacell below was very thick and sturdy. Perhaps it can make a good lightweight chamber. It is not conducting so be carful of charge up effects. Rohacell 110 WF , CMS 01, Rev. G. Type 4 Grade B
Kapton windows
Gas connectors
Legris quick connect
This connector takes a 1/4 OD input hose and has a 5/32 OD output tube which is glued into the GEM detector
Gas Gaskets
Buna-N® A DuPont Dow Elastomers registered trademark brand name of a type of elastomer seal; butyl material which has excellent resistance to gas permeation; an early vacuum seal, generally displaced by Viton®.
http://www-hades.gsi.de/mdc/literatur/outgassing.ps
http://www.vacuumlab.com/Articles/Gas%20Loads%20and%20O-Rings.pdf
Permeation Rates for Air
BUNA-N =
VITON =
"The fact that Viton has an air permeation rate that is one order of magnitude lower than Buna-N shows one reason why it is used more and more often in high vacuum systems even though Buna-N's resiliency, as evidenced by the bounce test, makes it easier to achieve a leak-free seal. "
http://www.vacuumlab.com/Articles/Gas%20Loads%20Elastomer-Metal%20Seals.pdf
Marco Rubber
Vendor Contact
Marco Rubber & Plastic Products, Inc. 334 Clark Street North Andover, MA 01845 USA Telephone: 800-775-6525 Fax: 978-688-6915
O-ring design
http://www.marcorubber.com/gd-directory.htm
For example:
another vendor
http://www.allorings.com/material_selection.htm
candidate part numbers
Gasket Cord: part# CB1000-2.36 ; a 2.36 outer diameter O-ring cord which we can use to make O-rings. The O-grin groove should be 1.77 mm deep and you can use superglue to joing the ends of the cord.
Specifications
Compound# Color Hardness Shore A Tensile Mpa (Psi) Elongation % 22Hr C/S @ 100C Low Temp High Temp B1000 Black 70 15.0 (2,150) 400 10 –40°C(–40°F) 120°C(248°F)
- Buna-N is available in a wide range of Durometers and Colors,
Calculating the gaskets min radius of curvature
( inches)
- where
- R= radius of curvature in inches
- C= 1/2 the thickness of the material
- E= modulus of elasticity
- S= maximum fiber stress of yield stress of the material
Example for Buna-N
C = 2.36 mm/2
E= Elongation/Tensile = 4/2150 (1/psi)
S =?
Copper Clad Kapton
1.) Gus Gustafson DuPont Flexible Circuit Materials 14 T. W. Alexander Drive Research Triangle Park, NC 27709 Phone: 919-248-5280
AP7156E: 2 mil (50 micron kapton, 9 mil double sided copper. Need to etch the copper off of one side.
2.) Digikey; Copper foil tape. You can put a layer of kapton on the sticky side to prevent it from outgassing too much
Item # 3M1194D-1FT-ND
wave soldering
Connectors
SHV Panel Bulkhead
Kings solder SHV Bulkhead Receptacle, Kings Part # 1707-1 File:Kings1707-1 DESIGN.pdf
Kings Electronics
1685 Overview Drive
Rock Hill, SC 29730
Toll Free: 1-888-909-5551
Switchboard: 1-803-909-5000
Min order is 1000 pieces = $1300
Astrix can do smaller orders
818-381-8353 ask for Monique
BNC Female Panel Bulkhead
File:Amphenol BNC Panel Bulkhead.pdf
VFAT input connector
Panasonic P5KS 130 pin surface mount 6.5 mm mated heigth, 0.5 mm narrow pitch
https://panasonic-denko.co.jp/ac/e/control/connector/base-base/p5ks/attention/index.jsp
File:VFAT header inputconnector.pdf
http://panasonic-denko.co.jp/ac/e/control/connector/base-base/p5ks/index.jsp
Precidip Connector
20 pin single row 1.27 mm pitch connectors for back of 10 x 10 cm GEM charge collector
http://www.westfield.co.uk/tp/html/13.html straight pin: 850-91-020-10-001
socket connector : 851-91-020-10-001
http://www.westfield.co.uk/tp/html/13.html
Gas Flow
Vent line
connectors
http://www.swagelok.com/search/find_products_home.aspx?SEARCH=/id-10000007/type-1
stainless steel tubing
http://www.coleparmer.com/catalog/product_view.asp?sku=3468060
8 ft line http://www.swagelok.com/search/product_detail.aspx?part=SS-FL4TA4TA4-96
http://www.swagelok.com/search/find_products_home.aspx?SEARCH=/id-10002236/type-1
flow meter
GEM detector volums 10 cm x 10 cm x 5 cm = 500 = 0.5 Liters
LHC Ar/Co2 (93/7 mix) high rates suggest a gas volume change every 10 hours http://vci.oeaw.ac.at/2001/talks/Tuesday/Aleksa.pdf
CDF Ar/ethane (50/50 mix) did one volume change every 30 hours http://www.slac.stanford.edu/pubs/icfa/spring05/paper1/paper1.pdf
SLAC (75% CO2, 21% Argon, 4% Isobutane, and 0.2% water mix) did 1 volume change every 10 hours , IEEE TRANSACTIONS ON NUCLEAR SCIENCE, VOL. 42, NO. 4, AUGUST 1995
BaBAR: The drift chamber represents a volume of 5m3 filled with a gas mixture of 80% Heand 20% C4H10. Gas will flow at approximately 15 l/min, giving one volume change every 5 to 8 hours.
A GEM detector volume change every 10 hours would need a flow meter capable of 0.05 Liters per hour (0.0017 /hr) measurement .
Media:Microcalibrator_for_DC.pdf this meter goes from 0 to 20 liter/min,probably accurate to 0.1 l/hr flow rate (want a factor of 2 lower flow rate measurement capability may be able to set for 1 volume change every 5 hours)
This flow meter can detect a volume change every 1/10 hour (0.2 ft^3/h) http://www.swagelok.com/search/product_detail.aspx?part=VAF-M1-01S-1-0
A glass tube VA flow meter goes down to 0.3 L/hr (a factor of 10 too high) GTF 1 CHD-B5-100 cm^3 /min http://www.roxspur.com/flow/glassva/1111.pdf
Probably won't be able to get a gas flow meter for the GEM.