Caltech HEP Tier2 is accessible to all members of the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) in CERN, Geneva, Switzerland. Interactive logins to Caltech Tier 2 resources must comply with Caltech computing policies.

NOTE: This is a requirement for a CMS Caltech Tier2 and SDN Cluster account. For other Clusters – please consult with the Supervisor at Caltech. If you are planning to work on a new or extended project in the SDN cluster, then please be kind to clone the document in this link and fill in the details to get access to the SDN testbed. Once filled in, please send this document to Be aware that this document will be available publicly at

To be eligible for an account, a person must have an active assignment from Human Resources. Please get in touch with your Supervisor at Caltech and review the guidelines and information on the forms that must be submitted. If you have any questions – please ask your Supervisor at Caltech or send an email to Once ALL forms are prepared, only then please submit completed documents to Tracy Sheffer at If you are unsure whether an individual’s activities would qualify as a Guest, Volunteer, or External Affiliate, please get in touch with your Supervisor at Caltech. The account creation process, once submitted, takes from 2 weeks to 2 months. Please make sure all steps are completed correctly to make the process smooth.

Requesting Tier2 account

After HR confirms the appointment, the visitor, visitor’s sponsor, or supervisor should request the account by email to <T2 admins>. Send the following information:

  • Your Supervisor at Caltech’s full name and contact email;
  • your full name and institutional contact email (;
  • Your affiliation status with Caltech; Start and End dates;
  • Caltech access username and UID;
  • An SSH public key (How to create SSH Key –
  • The initial account expiry date can be extended upon need (max one year for Caltech employees and students, max six months for external); the End date can not exceed your affiliation end date.
  • (Required for CMS/CERN Collaborators) An X509 grid certificate distinguished name in the form of: /DC=ch/DC=cern/OU=Organic Units/OU=Users/CN=... from CRAB Prerequisites – Grid certificate ;
  • Brief description of why and what access is needed, e.g., “I need access to condor queues to conduct research for X.” or “I need X TB Storage for CRAB output files”, etc.

Updating Tier2 account

If your HR assignment is still active, please follow the same rules as Requesting a Tier2 account.

Personal websites

You can create a personal web page by making a directory named public_html within your Linux home directory. You should create index.html or index.php within this directory to act as your default home page. In addition, you need to make your home directory group and others readable, the same as creating a public_html directory.
You should know that you are responsible for any material or files you store or publish under this directory.