General Test Beam Rules & Safety Instructions

The test beams at DESY II are available to any interested research group. Please consult the DESY test beam schedule and contact the TB-coordinators to request beam time. Since 2014, the test beam coordinators are sending out regulary calls for test beam projects - subscribe here to be added to the e-mail list for the call for proposals.

Experiments at the test beams are approved and scheduled by the testbeam coordinators.

Request for Beam Time

Please indicate in your test beam request:

  • the desired month
  • how many weeks
  • a short description of your project and experimental setup
  • the needed infrastructure (telescope, magnet, gas)
  • if applicable: use of hazardous materials

Please also mention periods where you won't need beam. A slot at the DESY-Test Beam Facility is usually one week long, Monday 0800- Monday 0800.


The information about the apparatus is needed to facilitate the work of the DESY group MEA, which supervises the test beam areas in Hall 2. It is important to note, that this group can support the installation of user equipment only to a very limited extend.


User Registration

All Users need to register in the DESY Indico system.

A DACHS card is mandatory to get an access to the DESY Test Beam; it controls access to the huts and is required to set the interlock. In case, you do not have a DACHS card, please be sure that you made your registration via Indico in time (i.e. at least one week before your beam time starts), following the invitation from the Test Beam coordinators which contains a link to your testbeam Indico page. Indico data will be used to issue a valid DACHS card for you. DACHS cards can be obtained at DESY, in bldg. 6/ R110 (Mon-Thu 8:00-12:00 and 13:00-16:00, Fri 8:00-12:00 and 13:00-14:00).

Hazardous Materials / Laser

For safety purposes, gases, especially flammable ones, cryogenics and radioactive materials all qualify as hazardous material and special rules apply. In particular, their use needs to be announced beforehand and cleared with the test beam coordinators.

Especially for handling radioactive samples additional requirements will apply., please see this document

Use of laser systems of class 3R, 3B or 4 (DIN EN 60825-1, 11.2001) has to be announced at least 4 weeks beforehand, including a written risk assessment and a sketch of the planned setup / procedures. They need to be protected by a laser interlock system.


No dosimeter is required for working at the Test Beam, unless additional radioactive material is in use.

Safety Requirements

Before the experiment starts installation at the test beam, the DESY test beam users group has to know the safety rules:

For this purpose it is necessary designate one person of the group (typically the project leader) as radiation and general safety contact. Additionally everybody who is working at the test beam has to attend a mandatory safety lecture. All users need to have a DACHS card to access the area. Finally, the setup has to be inspected by the test beam coordinator before taking data.

If there are special hazards, e.g. high voltages or flammable gases are used, an additional safety inspection by MEA and D5 might be required as well.

We offer a safety training Mondays 13:00 in the ATLAS Conference Room (Building 1c/room O1.310 (1st floor).

The safety training for the DESY-II Test Beam Facility is valid for one year. The fulfillment of all safety requirements has to be documented by a signature of the above mentioned persons in the door form, which copy should be posted at the entrance door of the beam hut for the duration of the experiment. In this way the personnel of the hall and the safety group are kept informed about the ongoing activities at the test beam.

Data Taking

Only after the Test Beam Coordinator has given his/her signature, the responsible person for the experiment can receive a safety key for the interlock system from the test beam coordinators or a deputy.

With this key the experimenter takes over the responsibility for the radiation protection until he returns the key to the Test Beam Coordinator; nobody is allowed to simply pass the key to the next group. In case of two groups working in one area in parallel, the leader of one group has to take the responsibility for the entire area.

All participants of the experiment have to learn how to use the test beams and the interlock system in time (find all according documents under "Instructions & Manuals").

While working in the DESY-II Test Beam Facility, please respect the following safety rules:

  • Escape routes must be kept clear at all times.
  • Smoking and open fires are not permitted in the Hall.
  • Eating and drinking (non-alcoholic beverages only) is only permitted inside the huts.
  • Working alone at the Test beam is only permitted during normal working hours (Mo-Fr, 0800-1700). Otherwise the two-man rule is in effect. People under 18 are not permitted to work in the DESY-II Test Beam Facility without personal supervision.
  • No climbing on the walls or the huts.


After Data-taking

After the end of the experiments all users have to remove their equipment and garbage from the test beam area. Approval from the test beam coordinators is necessary if equipment is left behind for later use. The test beam area will be inspected at the end of the period.

Shipping Equipment

It is the responsibility of the users to handle their shipment to and from the DESY-II Test Beam Facility. DESY will take no responsibility.