How make Notebook not to write in /tmp

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I am using Sage Notebook to generate very large files and then process them. The size of the files is tens of Gigabytes but that wouldn't be a problem the way things are set up in my worksheet. However, it seems no matter where the worksheet is stored the associated files are temporarily stored in /tmp whil ethe worksheet is working. For example,

$ ll /raid/istvan/Playground/Sage.sagenb/home/__store__/2/21/212/2123/admin/17/cells/4/
total 8
drwx------ 2 istvan istvan 4096 Sep  4 15:36 ./
drwxrwxr-x 9 istvan istvan 4096 Sep  4 15:34 ../
lrwxrwxrwx 1 istvan istvan   49 Sep  4 15:36 A.mmap -> /tmp/tmpa6CJmh/A.mmap
lrwxrwxrwx 1 istvan istvan   49 Sep  4 15:36 B.mmap -> /tmp/tmpa6CJmh/B.mmap
lrwxrwxrwx 1 istvan istvan   49 Sep  4 15:36 C.mmap -> /tmp/tmpa6CJmh/C.mmap
lrwxrwxrwx 1 istvan istvan   49 Sep  4 15:36 D.mmap -> /tmp/tmpa6CJmh/D.mmap

$ ll /tmp/tmpa6CJmh
total 68860
drwx------  2 istvan istvan        4096 Sep  4 15:35 ./
drwxrwxrwt 14 root   root         12288 Sep  4 15:35 ../
-rw-rw-r--  1 istvan istvan        1688 Sep  4 15:35 ___code___.py
-rw-rw-r--  1 istvan istvan 10000000000 Sep  4 15:37 A.mmap
lrwxrwxrwx  1 istvan istvan          54 Sep  4 15:35 data -> /raid/istvan/Playground/Sage.sagenb/home/admin/17/data/
-rw-rw-r--  1 istvan istvan 10000000000 Sep  4 15:37 B.mmap
-rw-rw-r--  1 istvan istvan 80000000000 Sep  4 15:37 C.mmap
-rw-rw-r--  1 istvan istvan 10000000000 Sep  4 15:37 D.mmap
-rw-rw-r--  1 istvan istvan        2219 Sep  4 15:35 _sage_input_6.py

The total size of the files is about 110 GB and I have plenty of room on the /raid partition where the Sage Notebook resides, but my / including /tmp partition is way too small for that. How can I make the Notebook NOT to write to /tmp? Is there an envar to set that?

Thanks for any suggestion,

Istvan