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Helical lamp specifications
by lamp manufacturer
Space Glass Incorporated
Telephone: 909-946-2676
Fax number: 909 946-6499
Kurt Fasold
BARE LAMPS (no reflectors) |
Korad K6 Lamp |
Apollo lamp |
Apollo lamp |
Apollo lamp |
|
Spaceglass stock # |
SG-6060 |
SG-2600 |
SG-2800 |
SG-2800 Modified |
|
Explosion Energy Joules * |
22800 Must be derated by 30-60% in a cavity |
30643 Must be derated by 30-60% in a cavity |
52012 Must be derated by 30-60% in a cavity |
43000 Must be derated by 30-60% in a cavity |
|
Lamp Impedance Ko ohm-amps1/2 ** |
107.2 |
80.3 |
136 |
103 |
|
Operating Voltage |
6.6kv |
5.835 kv |
6.450 kv |
6.450 kv |
|
Max Average Power watts *** |
8000 @ 5 gallons/min water |
3800 @ 5gallons/min water |
8000 @ 5gallons/min water |
8000 @ 5gallons/min water |
|
Inductance uh |
77 |
177 |
142 |
142 |
|
Circuit Impedance zo=(L/C)1/2 |
0.46ohm |
0.73ohm |
0.53ohm |
0.53ohm |
|
Peak pulse current amps I=Vin/2zo **** |
7142 |
3969 |
6084 |
6084 |
|
Capacitance ufd |
360 |
360 |
500 |
450
|
|
Pulse duration microseconds |
500 |
800 |
800 |
800 |
|
Energy Input Joules
|
8000 35% Explosion limit |
6128 20% Explosion limit |
10402 20% Explosion limit |
8678 20% Explosion limit |
|
Recommended voltage range |
4 - 10kv |
3 - 10kv |
3 - 10kv |
3 - 10kv |
|
Typical trigger voltage range |
25 - 30kv |
25 - 30kv |
25 - 35kv |
25 - 35kv |
|
Diameter of Coil inches OD |
1.5 |
1.85 |
2.35 |
2.35 |
|
Axial length between terminal pins. Inches |
6.1 |
6 |
8 |
7.25 |
|
Tube size OD mm |
12 |
15 |
15 |
15 |
|
Tube size ID mm |
10 |
13 |
13 |
13 |
|
Turns |
12 |
10 |
12 |
10 |
|
Arc length cm |
107.01 |
113.9 |
181.7 |
151.4 |
|
Hole size Coil ID |
16mm |
23mm |
33mm |
33mm |
|
Anode length from centerline pf coil |
41mm |
75mm |
75mm |
75mm |
|
Cathode length from centerline of coil |
33mm |
45mm |
45mm |
45mm |
|
Transverse dist. of the terminals pins |
32mm |
35mm |
48mm |
48mm |
|
Glass Bonnet diameter OD |
12mm |
11mm |
11mm |
11mm |
|
Max Laser rod size |
1/2 inch dia. |
3/4 inch dia. |
1 inch dia. |
1 inch dia. |
|
* Eex=(1.2x104)
ldtp2
Formula used assumes linear lamp
and damping factor of 0.8 Coil loading and cavity loading increase errosion,
potential minute cracking, and reduce explosion limit. Inaddition non optimum
circuit design will also reduce lifetime.
** Ko=1.27L/D was
used. Others suggest: Ko=1.27(P/450)0.2(L/D)
Ko appears to be calculated based
on 450 torr although mfg indicated 300 torr was generally how the lamps are
filled for easier firing.
*** These lamps can be air fired
but much lower average power is available. Water provides better optical
coupliing efficiency, more damping of shock during firings, better insulation
when properly deionized.. Additional expense, increased safety issues,
increased maintenance, are the disadvantages to water cooling. Water reduces
thermal loading on laser rod but increases thermal stress. Air firings can
increase thermal stress due to thermal hot spots and rod should be given 30mins
to cool between firings for improved rod lifetime. Laser rod surface cracking
can occur with either method if thermal stress is exceeded.
**** Peak current was
calculated as 2 times Zo yet according to EG&G and other sources Zo+Rt is
used instead where
EG&G provided formula:
Rt =0.065L/(D2)
L=arc length in inches. D bore of tube in cm. Damping factor of 0.8 and
pulse width at 1/3 max value is 100 usec to 1000usec.
The effect is overall lower peak
current. But in the above electrical data given, all these values are just
estimates and don't reflect actual electrical circuit performance.
Either electrical polarity okay
with these SG lamps. Xenon Corp helicals are electrical polarity sensitive
(true anode/cathode) and solder sealed end caps. SG are graded glass seal.
HELICAL
LAMPS generally run around 400 to 600 USD depending on vendor.
Other
suppliers:
Linear
Lamps: Generally around 225 to 275 USD each.
Xenon
Corp 800-936-6695 XL lamps. Okay to order single qty.
N-187C 3"x
7mm ID x 9mm OD linear
N-188C 6"x 7mm ID x 9mm
OD linear
Xenon also carries helicals
like the N-215C (solder seal)
Perkins
Elmer 800-950-3441 Four lamp min order.
FX-42C-3 3" x 7mm ID x
9mm linear OD. $225 dollars.
FX-45C-6 6"x7mm ID x 9mm
linear OD. $225 dollars (last time we ordered).
Also they have helicals:
http://opto.perkinelmer.com/Downloads/flashcatalog.pdf
Design data and lamps