Model GDS Hollow Cathode Lamp is a continuous-operation gas discharge source capable of producing hundreds of bright emission line features. It can generate wavelengths as short as HeII 228 Angstroms. The user has complete control of the emission spectrum by choosing the desired source gas (hydrogen, helium, neon, oxygen, argon, and carbon dioxide are among the many which can be utilized) and adjusting the pressure to produce maximum abundance of the desired ionization state. Features of the source include:

	Virtually maintenance-free
	Can operate continuously for weeks
	Emission is stable to ± few% over hours of operation
	Discharge region specially shaped to minimize self-absorption
	Lab-proven design
	No exposed high voltage
	Lightweight and compact (crucial for applications where translation ability is required, e.g., on traveling stage of Seya-Nomioka monochromators)
	No significant spurious electromagnetic radiation
	Convenient fittings for connection to user's equipment

In a typical application, the user connects the source to a reservoir of the desired source gas, a supply of cooling water, and a DC high voltage power supply. If the user's HV power supply does not have a current-limiting feature, a ballast resistor of about 3 kilohms must be connected in series with the source. The source is sufficiently lightweight that most users simply connect it to an existing vacuum flange, with no need for additional support. A voltage up to -5000V is required to initiate the discharge. Once breakdown is established, the typical operating voltage is -500 to -2000V. The total current draw from the high voltage power supply is typically 50mA to 350mA (depending on the intensity desired). Source gas will flow from the discharge region into the user's vacuum system, at a rate dependent upon the relative pressures and the conductance. The user controls the pressure in the source by adjusting this flow rate, typically with a needle-valve in the gas supply line. The user's existing vacuum pump can easily handle the modest gas flow without the need for additional pumping capacity in virtually all applications. 

Technical specifications:

	Intensity in bright lines about 10^12 photons/(cm2 sec steradian)
	Emission cone about 12 degrees (full angle)
	Weight: 5 lbs
	Dimensions: Approx. 4.5" dia. by 12" long
	High voltage connector type: Reynolds Industries 325 or customer preferred alternative
	Flange type for connection to user's vacuum system: KF 200 or customer preferred alternative
	Connections to cooling water hoses: Swagelock Quick-Connect Miniature Series or customer preferred alternative.

STEVEN SEPVEST CORPORATION
9720 Capital Ct, Suite 404B, Manassas, VA 20110, USA
TEL: (703) 547-8930     Fax: (703) 891-9809
Email: sales@sepvest.com 欢迎中文来信